RAMBUS INC
S-8, 1997-06-06
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>
 
     As filed with the Securities and Exchange Commission on June 6, 1997
                                                      Registration No. 333-____
=============================================================================== 

                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
 
                                   FORM S-8
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933
 
                               ----------------

                                  RAMBUS INC.
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
                               ----------------

         DELAWARE                                           77-0449233
(STATE OR OTHER JURISDICTION OF                         (I.R.S. EMPLOYER
INCORPORATION OR ORGANIZATION)                           IDENTIFICATION NUMBER)


                              2465 LATHAM STREET
                        MOUNTAIN VIEW, CALIFORNIA 94040
         (ADDRESS, INCLUDING ZIP CODE OF PRINCIPAL EXECUTIVE OFFICES)

                               ----------------
 
                                1990 STOCK PLAN
                                1997 STOCK PLAN
                       1997 EMPLOYEE STOCK PURCHASE PLAN
                           (FULL TITLE OF THE PLANS)
 
                               ----------------

                                  GARY HARMON
                  VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
                                  RAMBUS INC.
                              2465 LATHAM STREET
                        MOUNTAIN VIEW, CALIFORNIA 94040
                                (415) 903-3800
(NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
 OF AGENT FOR SERVICE)
 
                               ----------------

                                  Copies to:
                             GAIL C. HUSICK, ESQ.
                          J. MICHAEL ARRINGTON, ESQ.
                       WILSON SONSINI GOODRICH & ROSATI
                           PROFESSIONAL CORPORATION
                              650 PAGE MILL ROAD
                              PALO ALTO, CA 94304
                                (415) 493-9300

                               ----------------

                        CALCULATION OF REGISTRATION FEE
<TABLE> 
<CAPTION> 
===========================================================================================================================
                                                          PROPOSED MAXIMUM    
          TITLE OF SECURITIES             AMOUNT TO BE      OFFERING PRICE          PROPOSED MAXIMUM          AMOUNT OF    
           TO BE REGISTERED                REGISTERED         PER SHARE        AGGREGATE OFFERING PRICE    REGISTRATION FEE 
- ---------------------------------------------------------------------------------------------------------------------------
Common Stock
$0.001 par value:
<S>                                       <C>            <C>                <C>                           <C>
- - Outstanding under 1990 Stock Plan          2,012,340        $   3.38                $  6,801,710(1)         $ 2,062.00
- - Reserved or Outstanding under              1,000,000        $  31.19                $ 26,392,500(2)         $ 7,998.00
  1997 Stock Plan
- - Reserved under 1997 Employee Stock           400,000        $  26.51                $ 10,604,600(3)         $ 3,214.00
  Purchase Plan
TOTAL                                        3,412,340                                $ 43,798,810            $ 13,274.00
==========================================================================================================================
</TABLE>
(1) Estimated in accordance with Rule 457(h) solely for the purpose of
    calculating the registration fee on the basis of the weighted average
    exercise price of $ 3.38 per share for outstanding options to purchase a
    total of 2,012,340 shares of Common Stock.
(2) Estimated in accordance with Rule 457(h) solely for the purpose of
    calculating the registration fee on the basis of  (i) the weighted average
    exercise price of $12.00 per share for outstanding options to purchase a
    total of 250,000 shares of Common Stock and (ii) $31.19 per share (based on
    the average of the high and low prices of Registrant's Common Stock as
    reported on the Nasdaq National Market on June 4, 1997), for 750,000 shares
    of Common Stock reserved for issuance thereunder .
(3) Estimated in accordance with Rule 457(h) solely for the purpose of
    calculating the registration fee on the basis of $26.51 per share (85% of
    $31.19, which is the average of the high and low prices of Registrant's
    Common Stock as reported on the Nasdaq National Market on June 4, 1997).
<PAGE>
 
                                  RAMBUS INC.
                       REGISTRATION STATEMENT ON FORM S-8

                                    PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3.   INCORPORATION OF DOCUMENTS BY REFERENCE.

     There are hereby incorporated by reference in this Registration Statement
the following documents and information heretofore filed with the Securities and
Exchange Commission by the Registrant:

     1.   The Registrant's Prospectus, filed on May 14, 1997 pursuant to Rule
          424(b) promulgated under the Securities Act of 1933, as amended (the
          "Securities Act").

     2.   The description of Registrant's Common Stock contained in the
          Registrant's Registration Statement on Form 8-A dated April 2, 1997,
          filed pursuant to Section 12(g) of the Securities Exchange Act of
          1934, as amended (the "Exchange Act") which was declared effective on
          May 13, 1997, including any amendment or report filed for the purpose
          of updating such description.

     All documents filed by the Registrant pursuant to Sections 13(a), 13(c), 14
and 15(d) of the Exchange Act after the date hereof, and prior to the filing of
a post-effective amendment which indicates that all securities offered hereunder
have been sold or which deregisters all securities then remaining unsold under
this registration statement, shall be deemed to be incorporated by reference
herein and to be part hereof from the date of filing of such documents.

ITEM 4.   DESCRIPTION OF SECURITIES.

     Not applicable.

ITEM 5.   INTERESTS OF NAMED EXPERTS AND COUNSEL.

     As of May 29, 1997, certain members of Wilson Sonsini Goodrich & Rosati,
Professional Corporation, beneficially owned 2000 shares of the Company's Common
Stock.

ITEM 6. INDEMNIFICATION OF DIRECTORS AND OFFICERS

     The Company's Amended and Restated Certificate of Incorporation limits the
liability of directors to the maximum extent permitted by Delaware law. Delaware
law provides that a corporation's certificate of incorporation may contain, and
the Company's Amended and Restated Certificate of Incorporation does contain, a
provision eliminating or limiting the personal liability of a director for
monetary damages for breach of their fiduciary duties as directors, except for
liability (i) for any breach of their duty of loyalty to the corporation or its
stockholders, (ii) for acts or omissions not in good faith for which involve
intentional misconduct or a knowing violation of law, (iii) for unlawful
payments of dividend or unlawful stock repurchases or redemptions as provided in
Section 174 of the Delaware General Corporation Law or (iv) for any transaction
from which the director derived an improper personal benefit.

     The Company's Amended and Restated Bylaws provide that the Company shall
indemnify its directors, officers, employees and agents to the fullest extent
permitted by law. The Company believes that the indemnification 
<PAGE>
 
under its Amended and Restated Bylaws covers at least negligence and gross
negligence on the part of indemnified parties.

     The Company has entered into agreements to indemnify its directors and
officers, in addition to the indemnification provided for in the Company's
Amended and Restated Bylaws. These agreements, among other things, indemnify the
Company's directors and officers for certain expenses (including attorney fees),
judgments, fines and settlement amounts incurred by any such person in any
action or proceeding, including any action by or in the right of the Company,
arising out of such person's services as a director or officer of the company,
any subsidiary of the Company or any other company or enterprise to which the
person provides services at the request of the Company. The Company believes
that these provisions and agreements are necessary to attract and retain
qualified directors and officers.

     At present, there is no pending litigation or proceeding involving any
director, officer, employee or agent of the Company where indemnifications will
be required or permitted. The Company is not aware of any threatened litigation
or proceeding that might result in a claim for such indemnification.

ITEM 7.   EXEMPTION FROM REGISTRATION CLAIMED.

     Not applicable.
 
ITEM 8.   EXHIBITS.
 
Exhibit
Number    Description of Document
- -------   -----------------------

    4.1*   Amended and Restated Certificate of Incorporation of Registrant.

    4.2*   Certificate of Designation of Rights, Preferences and Privileges of
           Series E Participating Preferred Stock of Registrant.

    4.3*   Amended and Restated Bylaws of Registrant dated February 28, 1997.

    4.4*   Form of Amended and Restated Certificate of Incorporation of
           Registrant to be filed upon the closing of the Company's Initial
           Public Offering.

    4.5    1990 Stock Plan, as amended.

    4.6    1997 Stock Plan.

    4.7    1997 Employee Stock Purchase Plan.

    5.1    Opinion of Wilson Sonsini Goodrich & Rosati, Professional
           Corporation, as to legality of securities being registered.

   23.1    Consent of Coopers & Lybrand L.L.P., Independent Auditors.

   23.2    Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation
           (included in Exhibit 5.1).

   24.1    Powers of Attorney (see page 5).
- ------------------

(*)  Incorporated by reference to the Registrant's Registration Statement on
     Form S-1, as amended (File No. 333-22885).

                                      -2-
<PAGE>
 
ITEM 9.   UNDERTAKINGS.

     (a) The undersigned Registrant hereby undertakes:

        (1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this registration statement:

           (i)   To include any prospectus required by section 10(a)(3) of the
Securities Act of 1933;

           (ii)  To reflect in the prospectus any facts or events arising after
the effective date of the registration statement (or the most recent post-
effective amendment thereof) which, individually or in the aggregate, represent
a fundamental change in the information set forth in the registration statement.
Notwithstanding the foregoing, any increase or decrease in volume of securities
offered (if the total dollar value of securities offered would not exceed that
which was registered) and any deviation from the low or high end of the
estimated maximum offering range may be reflected in the form of prospectus
filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than a 20% change in the maximum
aggregate offering price set forth in the "Calculation of Registration Fee"
table in the effective registration statement.

           (iii) To include any material information with respect to the plan of
distribution not previously disclosed in the registration statement or any
material change to such information in the registration statement.

        Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply
if the information required to be included in a post-effective amendment by
those paragraphs is contained in periodic reports filed with or furnished to the
Commissioner by the Registrant pursuant to section 13 or section 15(d) of the
Securities Exchange Act of 1934 that are incorporated by reference in this
registration statement.

          (2) That, for the purpose of determining any liability under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

          (3) To remove from registration by means of a post-effective amendment
any of the securities being registered which remain unsold at the termination of
the offering.

    (b) The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
Registrant's annual report pursuant to section 13(a) or section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     (c) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the Registrant pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a director, officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act of 1933 and will be governed by the
final adjudication of such issue.

                                      -3-
<PAGE>
 
                                    SIGNATURES

          Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Mountain View, State of California, on June 6, 1997.


                          RAMBUS INC.


                          By: /s/ GARY G. HARMON
                             -----------------------------------
                             Gary G. Harmon,
                             Vice President, Finance and Chief Financial Officer

                                      -4-
<PAGE>
 
                               POWER OF ATTORNEY

          KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints Geoffrey R. Tate and Gary G.
Harmon, and each of them, his or her true and lawful agent, proxy and attorney-
in-fact, with full power of substitution and resubstitution, for him or her and
in his or her name, place and stead, in any and all capacities, to (i) act on,
sign and file with the Securities and Exchange Commission any and all amendments
(including post-effective amendments) to this Registration Statement on Form S-8
together with all schedules and exhibits thereto (ii) act on, sign and file such
certificates, instruments, agreements and other documents as may be necessary or
appropriate in connection therewith, and (iii) take any and all actions that may
be necessary or appropriate to be done, as fully for all intents and purposes as
he or she might or could do in person, hereby approving, ratifying and
confirming all that such agent, proxy and attorney-in-fact or any of his
substitutes may lawfully do or cause to be done by virtue thereof.

     IN ACCORDANCE WITH THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES AND ON THE DATE STATED:
<TABLE>
<CAPTION>
 
 
Signatures                                  Title                     Date
- ----------                                  -----                     ----
 
<S>                        <C>                                       <C>

/s/ GEOFFREY R. TATE       President, Chief Executive Officer and      June 6, 1997
- ------------------------   Director (principal executive officer)
  Geoffrey R. Tate       


/s/ GARY G. HARMON         Vice President Finance and Chief            June 6, 1997
- ------------------------   Financial Officer (principal financial
  Gary G. Harmon           and accounting officer)
 

/S/ WILLIAM DAVIDOW        Chairman of the Board of Directors          June 6, 1997
- ------------------------
     William Davidow


/S/ BRUCE DUNLEVIE         Director                                    June 6, 1997
- ------------------------
    Bruce Dunlevie


                           Director                                    
- ------------------------                                               
   Michael Farmwald


/S/ CHARLES GESCHKE        Director                                    June 6, 1997
- ------------------------                                               
   Charles Geschke


                           Director                                    
- ------------------------                                               
   Mark Horowitz
</TABLE> 

                                      -5-
<PAGE>
 
                               Index to Exhibits
                               -----------------
<TABLE>
<CAPTION>
 
 
  Exhibit
  Number      Description of Document
<C>      <S> 

    4.1*       Amended and Restated Certificate of Incorporation of Registrant.                            
    4.2*       Certificate of Designation of Rights, Preferences and Privileges of Series E Participating  
               Preferred Stock of Registrant.                                                              
    4.3*       Amended and Restated Bylaws of Registrant dated February 28, 1997.                          
    4.4        Form of Amended and Restated Certificate of Incorporation of Registrant to be filed         
               upon the closing of the Company's Initial Public Offering.                                  
    4.5        1990 Stock Plan, as amended.                                                                
    4.6        1997 Stock Plan.                                                                            
    4.7        1997 Employee Stock Purchase Plan.                                                          
    5.1        Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation, as to legality       
               of securities being registered.                                                             
   23.1        Consent of Coopers & Lybrand L.L.P., Independent Auditors.                                  
   23.2        Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (included in          
               Exhibit 5.1).                                                                               
   24.1        Powers of Attorney (see page 5).                                                             
</TABLE> 
- ------------------
(*)  Incorporated by reference to the Registrant's Registration Statement on
     Form S-1, as amended (File No. 333-22885).

                                      -6-

<PAGE>

                                                                     EXHIBIT 4.5
 
                                  RAMBUS INC.

                                1990 STOCK PLAN
                        (as amended September 14, 1994)
                           (as amended July 5, 1995)
                        (as amended September 14, 1995)
                        (as amended September 26, 1996)
                                        
     1.   Purposes of the Plan.  The purposes of this Stock Plan are to attract
          --------------------                                                 
and retain the best available personnel for positions of substantial
responsibility, to provide additional incentive to Employees and Consultants of
the Company and its Subsidiaries and to promote the success of the Company's
business. Options granted under the Plan may be incentive stock options (as
defined under Section 422A of the Code) or non-statutory stock options, as
determined by the Administrator at the time of grant of an option and subject to
the applicable provisions of Section 422A of the Code, as amended, and the
regulations promulgated thereunder. Stock purchase rights may also be granted
under the Plan.

     2.   Definitions.  As used herein, the following definitions shall apply:
          -----------                                                         

          (a) "Administrator" means the Board or any of its Committees appointed
               -------------                                                    
pursuant to Section 4 of the Plan.

          (b) "Board" means the Board of Directors of the Company.
               -----                                              

          (c) "Code" means the Internal Revenue Code of 1986, as amended.
               ----                                                      

          (d) "Committee"  means the Committee appointed by the Board of
               ---------                                                
Directors in accordance with paragraph (a) of Section 4 of the Plan.

          (e) "Common Stock" means the Common Stock of the Company.
               ------------                                        

          (f) "Company" means Rambus Inc., a California corporation.
               -------                                              

          (g) "Consultant" means any person, including an advisor, who is
               ----------                                                
engaged by the Company or any Parent or Subsidiary to render services and is
compensated for such services, and any director of the Company whether
compensated for such services or not provided that if and in the event the
Company registers any class of any equity security pursuant to the Exchange Act,
the term Consultant shall thereafter not include directors who are not
compensated for their services or are paid only a director's fee by the Company.

          (h) "Continuous Status as an Employee" means the absence of any
               --------------------------------                          
interruption or termination of the employment relationship by the Company or any
Subsidiary. Continuous Status as an Employee shall not be considered interrupted
in the case of: (i) sick leave; (ii) military leave; (iii) any other leave of
absence approved by the Board, provided that such leave is for a period of not
more than ninety (90) days, unless reemployment upon the expiration of such
leave is guaranteed by contract or statute, or unless provided otherwise
pursuant to Company policy adopted from time to
<PAGE>
 
time; or (iv) in the case of transfers between locations of the Company or
between the Company, its Subsidiaries or its successor.

          (i) "Employee" means any person, including officers and directors,
               --------                                                     
employed by the Company or any Parent or Subsidiary of the Company.  The payment
of a director's fee by the Company shall not be sufficient to constitute
"employment" by the Company.

          (j) "Exchange Act" means the Securities Exchange Act of 1934, as
               ------------                                               
amended.

          (k) "Fair Market Value" means, as of any date, the value of Common
               -----------------                                            
Stock determined as follows:

               (i)   If the Common Stock is listed on any established stock
exchange or a national market system including without limitation the National
Market System of the National Association of Securities Dealers, Inc. Automated
Quotation ("NASDAQ") System, its Fair Market Value shall be the closing sales
price for such stock (or the closing bid, if no sales were reported, as quoted
on such system or exchange, or the exchange with the greatest volume of trading
in Common Stock, for the last market trading day prior to the time of
determination) as reported in the Wall Street Journal or such other source as
the Administrator deems reliable;

               (ii)  If the Common Stock is quoted on the NASDAQ System (but not
on the National Market System thereof) or regularly quoted by a recognized
securities dealer but selling prices are not reported, its Fair Market Value
shall be the mean between the high and low asked prices for the Common Stock or;

               (iii) In the absence of an established market for the Common
Stock, the Fair Market Value thereof shall be determined in good faith by the
Administrator.

          (l) "Incentive Stock Option" means an Option intended to qualify as an
               ----------------------                                           
incentive stock option within the meaning of Section 422A of the Code.

          (m) "Nonstatutory Stock Option" means an Option not intended to
               -------------------------                                 
qualify as an Incentive Stock Option.

          (n) "Evergreen Stock Option" means an Option which shall vest 100% as
               ----------------------                                          
to the shares subject to such Option one year from the date that all options
granted previous to, and currently held by, the Optionee have vested in full.

          (o)  "Evergreen II Stock Option" means an Option which shall vest
                -------------------------                                  
cumulatively as to 1/12 of the shares subject to such Option for each month
which has expired (i) in the case of Evergreen II Stock Options granted prior to
September 14, 1995, since the date all options granted previous to, and
currently held by, the Optionee have vested in full and (ii) in the case of
Evergreen II Stock Options granted on or after September 14, 1995, since the
date that all new hire Options, rehire 

                                      -2-
<PAGE>
 
Options, Evergreen Stock Options and Evergreen II Stock Options granted
previously to, and currently held by, the Optionee have vested in full.

          (p) "Option" means a stock option granted pursuant to the Plan.
               ------                                                    

          (q) "Optioned Stock" means the Common Stock subject to an Option.
               --------------                                              

          (r) "Optionee" means an Employee or Consultant who receives an Option.
               --------                                                         

          (s) "Parent" means a "parent corporation", whether now or hereafter
               ------                                                        
existing, as defined in Section 425(e) of the Code.

          (t) "Plan" means this 1990 Stock Plan.
               ----                             

          (u) "Restricted Stock" means shares of Common Stock acquired pursuant
               ----------------                                                
to a grant of Stock Purchase Rights under Section 11 below.

          (v) "Share" means a share of the Common Stock, as adjusted in
               -----                                                   
accordance with Section 13 of the Plan.

          (w) "Subsidiary" means a "subsidiary corporation", whether now or
               ----------                                                  
hereafter existing, as defined in Section 425(f) of the Code.

     3.   Stock Subject to the Plan.  Subject to the provisions of Section 13 of
          -------------------------                                             
the Plan, the maximum aggregate number of shares which may be optioned and sold
under the Plan is 6,875,000 shares of Common Stock. The shares may be
authorized, but unissued, or reacquired Common Stock.

          If an Option should expire or become unexercisable for any reason
without having been exercised in full, the unpurchased Shares which were subject
thereto shall, unless the Plan shall have been terminated, become available for
future grant under the Plan.

     4.   Administration of the Plan.
          -------------------------- 

          (a)  Procedure.
               --------- 

               (i)   Administration With Respect to Directors and Officers. With
                     -----------------------------------------------------  
respect to grants of Options or Stock Purchase Rights to Employees who are also
officers or directors of the Company, the Plan shall be administered by (A) the
Board if the Board may administer the Plan in compliance with Rule 16b-3
promulgated under the Exchange Act or any successor thereto ("Rule 16b-3") with
respect to a plan intended to qualify thereunder as a discretionary plan, or (B)
a Committee designated by the Board to administer the Plan, which Committee
shall be constituted in such a manner as to permit the Plan to comply with Rule
16b-3 with respect to a plan intended to 

                                      -3-
<PAGE>
 
qualify thereunder as a discretionary plan. Once appointed, such Committee shall
continue to serve in its designated capacity until otherwise directed by the
Board. From time to time the Board may increase the size of the Committee and
appoint additional members thereof, remove members (with or without cause) and
appoint new members in substitution therefor, fill vacancies, however caused,
and remove all members of the Committee and thereafter directly administer the
Plan, all to the extent permitted by Rule 16b-3 with respect to a plan intended
to qualify thereunder as a discretionary plan.

               (ii) Multiple Administrative Bodies.  If permitted by Rule 
                    ------------------------------           
16b-3, the Plan may be administered by different bodies with respect to
directors, non-director officers and Employees who are neither directors nor
officers.

               (iii) Administration With Respect to Consultants and Other
                     ----------------------------------------------------
Employees. With respect to grants of Options or Stock Purchase Rights to
- ---------
Employees or Consultants who are neither directors nor officers of the Company,
the Plan shall be administered by (A) the Board or (B) a Committee designated by
the Board, which Committee shall be constituted in such a manner as to satisfy
the legal requirements relating to the administration of incentive stock option
plans, if any, of California corporate and securities laws and of the Code (the
"Applicable Laws"). Once appointed, such Committee shall continue to serve in
its designated capacity until otherwise directed by the Board. From time to time
the Board may increase the size of the Committee and appoint additional members
thereof, remove members (with or without cause) and appoint new members in
substitution therefor, fill vacancies, however caused, and remove all members of
the Committee and thereafter directly administer the Plan, all to the extent
permitted by the Applicable Laws.

          (b) Powers of the Administrator.  Subject to the provisions of the
              ---------------------------                                   
Plan and in the case of a Committee, the specific duties delegated by the Board
to such Committee, the Administrator shall have the authority, in its
discretion:

               (i)   to determine the Fair Market Value of the Common Stock, in
accordance with Section 2(k) of the Plan;

               (ii)  to select the officers, Consultants and Employees to whom
Options and Stock Purchase Rights may from time to time be granted hereunder;

               (iii) to determine whether and to what extent Options and Stock
Purchase Rights or any combination thereof, are granted hereunder;

               (iv)  to determine the number of shares of Common Stock to be
covered by each such award granted hereunder;

               (v)   to approve forms of agreement for use under the Plan;

               (vi)  to determine the terms and conditions, not inconsistent
with the terms of the Plan, of any award granted hereunder (including, but not
limited to, the share price and any 

                                      -4-
<PAGE>
 
restriction or limitation, or any vesting acceleration or waiver of forfeiture
restrictions regarding any Option or other award and/or the shares of Common
Stock relating thereto, based in each case on such factors as the Administrator
shall determine, in its sole discretion);

               (vi)  to determine whether and under what circumstances an Option
may be settled in cash under subsection 9(f) instead of Common Stock;

               (vii) to determine whether, to what extent and under what
circumstances Common Stock and other amounts payable with respect to an award
under this Plan shall be deferred either automatically or at the election of the
participant (including providing for and determining the amount, if any, of any
deemed earnings on any deferred amount during any deferral period);

               (ix)  to reduce the exercise price of any Option to the then
current Fair Market Value if the Fair Market Value of the Common Stock covered
by such Option shall have declined since the date the Option was granted; and

               (x)   to determine the terms and restrictions applicable to Stock
Purchase Rights and the Restricted Stock purchased by exercising such Stock
Purchase Rights.

          (c) Effect of Committee's Decision.  All decisions, determinations and
              ------------------------------                                    
interpretations of the Administrator shall be final and binding on all Optionees
and any other holders of any Options.

     5.   Eligibility.
          ----------- 

          (a) Nonstatutory Stock Options may be granted to Employees and
Consultants. Incentive Stock Options may be granted only to Employees. Evergreen
and Evergreen II Stock Options may only be granted to Employees and Consultants
who earn more than $60,000 per year. An Employee or Consultant who has been
granted an Option may, if he is otherwise eligible, be granted an additional
Option or Options.

          (b) Each Option shall be designated in the written option agreement as
either an Incentive Stock Option or a Nonstatutory Stock Option.  However,
notwithstanding such designations, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Options designated as Incentive Stock
Options are exercisable for the first time by any Optionee during any calendar
year (under all plans of the Company or any Parent or Subsidiary) exceeds
$100,000, such excess Options shall be treated as Nonstatutory Stock Options.

          (c) For purposes of Section 5(b), Incentive Stock Options shall be
taken into account in the order in which they were granted, and the Fair Market
Value of the Shares shall be determined as of the time the Option with respect
to such Shares is granted.

                                      -5-
<PAGE>
 
          (d) The Plan shall not confer upon any Optionee any right with respect
to continuation of employment or consulting relationship with the Company, nor
shall it interfere in any way with his right or the Company's right to terminate
his employment or consulting relationship at any time, with or without cause.

     6.   Term of Plan.  The Plan shall become effective upon the earlier to
          ------------                                                      
occur of its adoption by the Board of Directors or its approval by the
shareholders of the Company as described in Section 19 of the Plan. It shall
continue in effect for a term of ten (10) years unless sooner terminated under
Section 15 of the Plan.

     7.   Term of Option.  The term of each Option shall be the term stated in
          --------------                                                      
the Option Agreement; provided, however, that in the case of an Incentive Stock
Option, the term shall be no more than ten (10) years from the date of grant
thereof or such shorter term as may be provided in the Option Agreement.
However, in the case of an Option granted to an Optionee who, at the time the
Option is granted, owns stock representing more than ten percent (10%) of the
voting power of all classes of stock of the Company or any Parent or Subsidiary,
the term of the Option shall be five (5) years from the date of grant thereof or
such shorter term as may be provided in the Option Agreement.

     8.   Option Exercise Price and Consideration.
          --------------------------------------- 

          (a) The per share exercise price for the Shares to be issued pursuant
to exercise of an Option shall be such price as is determined by the Board, but
shall be subject to the following:

               (i)   In the case of an Incentive Stock Option

          (A) granted to an Employee who, at the time of the grant of such
Incentive Stock Option, owns stock representing more than ten percent (10%) of
the voting power of all classes of stock of the Company or any Parent or
Subsidiary, the per Share exercise price shall be no less than 110% of the Fair
Market Value per Share on the date of grant.

          (B) granted to any Employee, the per Share exercise price shall be no
less than 100% of the Fair Market Value per Share on the date of grant.

               (ii)  In the case of a Nonstatutory Stock Option

          (A) granted to a person who, at the time of the grant of such Option,
owns stock representing more than ten percent (10%) of the voting power of all
classes of stock of the Company or any Parent or Subsidiary, the per Share
exercise price shall be no less than 110% of the Fair Market Value per Share on
the date of the grant.

          (B) granted to any person, the per Share exercise price shall be no
less than 85% of the Fair Market Value per Share on the date of grant.

                                      -6-
<PAGE>
 
          (b)  The consideration to be paid for the Shares to be issued upon
exercise of an Option, including the method of payment, shall be determined by
the Administrator (and, in the case of an Incentive Stock Option, shall be
determined at the time of grant) and may consist entirely of (1) cash, (2)
check, (3) promissory note, (4) other Shares which (x) in the case of Shares
acquired upon exercise of an Option either have been owned by the Optionee for
more than six months on the date of surrender or were not acquired, directly or
indirectly, from the Company, and (y) have a Fair Market Value on the date of
surrender equal to the aggregate exercise price of the Shares as to which said
Option shall be exercised, (5) authorization from the Company to retain from the
total number of Shares as to which the Option is exercised that number of Shares
having a Fair Market Value on the date of exercise equal to the exercise price
for the total number of Shares as to which the Option is exercised, (6) delivery
of a properly executed exercise notice together with irrevocable instructions to
a broker to promptly deliver to the Company the amount of sale or loan proceeds
required to pay the exercise price, (7) by delivering an irrevocable
subscription agreement for the Shares which irrevocably obligates the option
holder to take and pay for the Shares not more than twelve months after the date
of delivery of the subscription agreement, (8) any combination of the foregoing
methods of payment, (9) or such other consideration and method of payment for
the issuance of Shares to the extent permitted under Applicable Laws.  In making
its determination as to the type of consideration to accept, the Board shall
consider if acceptance of such consideration may be reasonably expected to
benefit the Company (Section 315(b) of the California Corporations Code).

     9.   Exercise of Option.
          ------------------ 

          (a) Procedure for Exercise; Rights as a Shareholder. Any Option
              -----------------------------------------------            
granted hereunder shall be exercisable at such times and under such conditions
as determined by the Board, including performance criteria with respect to the
Company and/or the Optionee, and as shall be permissible under the terms of the
Plan.

          An Option may not be exercised for a fraction of a Share.

          An Option shall be deemed to be exercised when written notice of such
exercise has been given to the Company in accordance with the terms of the
Option by the person entitled to exercise the Option and full payment for the
Shares with respect to which the Option is exercised has been received by the
Company. Full payment may, as authorized by the Board, consist of any
consideration and method of payment allowable under Section 8(b) of the Plan.
Until the issuance (as evidenced by the appropriate entry on the books of the
Company or of a duly authorized transfer agent of the Company) of the stock
certificate evidencing such Shares, no right to vote or receive dividends or any
other rights as a shareholder shall exist with respect to the Optioned Stock,
notwithstanding the exercise of the Option. The Company shall issue (or cause to
be issued) such stock certificate promptly upon exercise of the Option. No
adjustment will be made for a dividend or other right for which the record date
is prior to the date the stock certificate is issued, except as provided in
Section 11 of the Plan.

                                      -7-
<PAGE>
 
          Exercise of an Option in any manner shall result in a decrease in the
number of Shares which thereafter may be available, both for purposes of the
Plan and for sale under the Option, by the number of Shares as to which the
Option is exercised.

          (b) Termination of Employment. In the event of termination of an
              -------------------------                                   
Optionee's consulting relationship or Continuous Status as an Employee with the
Company (as the case may be), such Optionee may, but only within ninety (90)
days (or such other period of time as is determined by the Board, with such
determination in the case of an Incentive Stock Option being made at the time of
grant of the Option and not exceeding ninety (90) days) after the date of such
termination (but in no event later than the expiration date of the term of such
Option as set forth in the Option Agreement), exercise his Option to the extent
that Optionee was entitled to exercise it at the date of such termination.  To
the extent that Optionee was not entitled to exercise the Option at the date of
such termination, or if Optionee does not exercise such Option to the extent so
entitled within the time specified herein, the Option shall terminate.

          (c) Disability of Optionee.  Notwithstanding the provisions of Section
              ----------------------                                            
9(b) above, in the event of termination of an Optionee's Consulting relationship
or Continuous Status as an Employee as a result of his total and permanent
disability (as defined in Section 22(e)(3) of the Code), Optionee may, but only
within twelve (12) months from the date of such termination (but in no event
later than the expiration date of the term of such Option as set forth in the
Option Agreement), exercise the Option to the extent otherwise entitled to
exercise it at the date of such termination.  To the extent that Optionee was
not entitled to exercise the Option at the date of termination, or if Optionee
does not exercise such Option to the extent so entitled within the time
specified herein, the Option shall terminate.

          (d) Death of Optionee.  In the event of the death of an Optionee, the
              -----------------                                                
Option may be exercised, at any time within twelve (12) months following the
date of death (but in no event later than the expiration date of the term of
such Option as set forth in the Option Agreement), by the Optionee's estate or
by a person who acquired the right to exercise the Option by bequest or
inheritance, but only to the extent the Optionee was entitled to exercise the
Option at the date of death.  To the extent that Optionee was not entitled to
exercise the Option at the date of termination, or if Optionee does not exercise
such Option to the extent so entitled within the time specified herein, the
Option shall terminate.

          (e) Rule 16b-3.  Options granted to persons subject to Section 16(b)
              ----------                                                      
of the Exchange Act must comply with Rule 16b-3 and shall contain such
additional conditions or restrictions as may be required thereunder to qualify
for the maximum exemption from Section 16 of the Exchange Act with respect to
Plan transactions.

          (f) Buyout Provisions.  The Administrator may at any time offer to buy
              -----------------                                                 
out for a payment in cash or Shares, an Option previously granted, based on such
terms and conditions as the Administrator shall establish and communicate to the
Optionee at the time that such offer is made.

                                      -8-
<PAGE>
 
     10.  Non-Transferability of Options.  The Option may not be sold, pledged,
          ------------------------------                                       
assigned, hypothecated, transferred, or disposed of in any manner other than by
will or by the laws of descent or distribution and may be exercised, during the
lifetime of the Optionee, only by the Optionee.

     11.  Stock Purchase Rights.
          --------------------- 

          (a) Rights to Purchase.  Stock Purchase Rights may be issued either
              ------------------                                             
alone, in addition to, or in tandem with other awards granted under the Plan
and/or cash awards made outside of the Plan. After the Administrator determines
that it will offer Stock Purchase Rights under the Plan, it shall advise the
offeree in writing of the terms, conditions and restrictions related to the
offer, including the number of Shares that such person shall be entitled to
purchase, the price to be paid (which price shall not be less than 85% of the
Fair Market Value of the Shares as of the date of the offer), and the time
within which such person must accept such offer, which shall in no event exceed
thirty (30) days from the date upon which the Administrator made the
determination to grant the Stock Purchase Right. The offer shall be accepted by
execution of a Restricted Stock purchase agreement in the form determined by the
Administrator. Shares purchased pursuant to the grant of a Stock Purchase Right
shall be referred to herein as "Restricted Stock."

          (b) Repurchase Option.  Unless the Administrator determines otherwise,
              -----------------                                                 
the Restricted Stock purchase agreement shall grant the Company a repurchase
option exercisable upon the voluntary or involuntary termination of the
purchaser's employment with the Company for any reason (including death or
Disability).  The purchase price for Shares repurchased pursuant to the
Restricted Stock purchase agreement shall be the original price paid by the
purchaser and may be paid by cancellation of any indebtedness of the purchaser
to the Company.  The repurchase option shall lapse at such rate as the Committee
may determine, but in no event at a rate less than 20% per annum. If the
Repurchase Option is assigned by the Company and the Fair market value of the
shares, as determined by the administrator, exceeds the repurchase price, and
such assignee exercises the Repurchase Option, then the assignee shall pay the
Company the difference between the fair market value of the Shares repurchased
and the aggregate repurchase price.

          (c) Other Provisions.  The Restricted Stock purchase agreement shall
              ----------------                                                
contain such other terms, provisions and conditions not inconsistent with the
Plan as may be determined by the Administrator in its sole discretion. In
addition, the provisions of Restricted Stock purchase agreements need not be the
same with respect to each purchaser.

          (d) Rights as a Shareholder.  Once the Stock Purchase Right is
              -----------------------                                   
exercised, the purchaser shall have the rights equivalent to those of a
shareholder, and shall be a shareholder when his or her purchase is entered upon
the records of the duly authorized transfer agent of the Company. No adjustment
will be made for a dividend or other right for which the record date is prior to
the date the Stock Purchase Right is exercised, except as provided in Section 13
of the Plan.

     12.  Stock Withholding to Satisfy Withholding Tax Obligations.  At the
          --------------------------------------------------------         
discretion of the Administrator, Optionees may satisfy withholding obligations
as provided in this paragraph. When an 

                                      -9-
<PAGE>
 
Optionee incurs tax liability in connection with an Option or Stock Purchase
Right, which tax liability is subject to tax withholding under applicable tax
laws, and the Optionee is obligated to pay the Company an amount required to be
withheld under applicable tax laws, the Optionee may satisfy the withholding tax
obligation by electing to have the Company withhold from the Shares to be issued
upon exercise of the Option, or the Shares to be issued in connection with the
Stock Purchase Right, if any, that number of Shares having a Fair Market Value
equal to the amount required to be withheld. The Fair Market Value of the Shares
to be withheld shall be determined on the date that the amount of tax to be
withheld is to be determined (the "Tax Date").

     All elections by an Optionee to have Shares withheld for this purpose shall
be made in writing in a form acceptable to the Administrator and shall be
subject to the following restrictions:

          (a) the election must be made on or prior to the applicable Tax Date;

          (b) once made, the election shall be irrevocable as to the particular
Shares of the Option or Right as to which the election is made;

          (c) all elections shall be subject to the consent or disapproval of
the Administrator;

          (d) if the Optionee is subject to Rule 16b-3, the election must comply
with the applicable provisions of Rule 16b-3 and shall be subject to such
additional conditions or restrictions as may be required thereunder to qualify
for the maximum exemption from Section 16 of the Exchange Act with respect to
Plan transactions.

     In the event the election to have Shares withheld is made by an Optionee
and the Tax Date is deferred under Section 83 of the Code because no election is
filed under Section 83(b) of the Code, the Optionee shall receive the full
number of Shares with respect to which the Option or Stock Purchase Right is
exercised but such Optionee shall be unconditionally obligated to tender back to
the Company the proper number of Shares on the Tax Date.

     13.  Adjustments Upon Changes in Capitalization or Merger. Subject to any
          ----------------------------------------------------                
required action by the shareholders of the Company, the number of shares of
Common Stock covered by each outstanding Option, and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as to
which no Options have yet been granted or which have been returned to the Plan
upon cancellation or expiration of an Option, as well as the price per share of
Common Stock covered by each such outstanding Option, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration."  Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of 

                                      -10-
<PAGE>
 
any class, or securities convertible into shares of stock of any class, shall
affect, and no adjustment by reason thereof shall be made with respect to, the
number or price of shares of Common Stock subject to an Option.

          In the event of the proposed dissolution or liquidation of the
Company, the Board shall notify the Optionee at least fifteen (15) days prior to
such proposed action. To the extent it has not been previously exercised, the
Option will terminate immediately prior to the consummation of such proposed
action. In the event of a merger of the Company with or into another
corporation, the Option shall be assumed or an equivalent option shall be
substituted by such successor corporation or a parent or subsidiary of such
successor corporation. In the event that such successor corporation does not
agree to assume such Option or to substitute an equivalent option, the Board
shall notify the Optionee that the Option shall be exercisable for a period of
fifteen (15) days from the date of such notice to the extent that Optionee was
entitled to exercise it upon the expiration of such period, and, to the extent
that Optionee was not entitled to exercise such Option upon the expiration of
such period, or if the Optionee does not exercise such Option to the extent so
entitled within such period, the Option shall terminate. With respect to any
Option granted prior to the July 17, 1992, in the event that such successor
corporation refuses to assume such Option or to substitute an equivalent option,
the Board shall, in lieu of such assumption or substitution, provide for the
Optionee to have the right to exercise such Option as to all of the Optioned
Stock, including Shares as to which the Option would not otherwise be
exercisable. If the Board makes an Option fully exercisable in lieu of
assumption or substitution in the event of a merger, the Board shall notify the
Optionee that such Option shall be fully exercisable for a period of fifteen
(15) days from the date of such notice, and such Option will terminate upon the
expiration of such period.
 
     14.  Time of Granting Options.  The date of grant of an Option shall, for
          ------------------------                                            
all purposes, be the date on which the Administrator makes the determination
granting such Option, or such other date as is determined by the Board.  Notice
of the determination shall be given to each Employee or Consultant to whom an
Option is so granted within a reasonable time after the date of such grant.

     15.  Amendment and Termination of the Plan.
          ------------------------------------- 

          (a) Amendment and Termination.  The Board may at any time amend,
              -------------------------                                   
alter, suspend or discontinue the Plan, but no amendment, alteration, suspension
or discontinuation shall be made which would impair the rights of any Optionee
under any grant theretofore made, without his or her consent.  In addition, to
the extent necessary and desirable to comply with Rule 16b-3 under the Exchange
Act or with Section 422A of the Code (or any other applicable law or regulation,
including the requirements of the NASD or an established stock exchange), the
Company shall obtain shareholder approval of any Plan amendment in such a manner
and to such a degree as required.

          (b) Effect of Amendment or Termination.  Any such amendment or
              ----------------------------------                        
termination of the Plan shall not affect Options already granted and such
Options shall remain in full force and effect as if this Plan had not been
amended or terminated, unless mutually agreed otherwise between the 

                                      -11-
<PAGE>
 
Optionee and the Board, which agreement must be in writing and signed by the
Optionee and the Company.

     16.  Conditions Upon Issuance of Shares.  Shares shall not be issued
          ----------------------------------                             
pursuant to the exercise of an Option unless the exercise of such Option and the
issuance and delivery of such Shares pursuant thereto shall comply with all
relevant provisions of law, including, without limitation, the Securities Act of
1933, as amended, the Exchange Act, the rules and regulations promulgated
thereunder, and the requirements of any stock exchange upon which the Shares may
then be listed, and shall be further subject to the approval of counsel for the
Company with respect to such compliance.

          As a condition to the exercise of an Option, the Company may require
the person exercising such Option to represent and warrant at the time of any
such exercise that the Shares are being purchased only for investment and
without any present intention to sell or distribute such Shares if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned relevant provisions of law.

     17.  Reservation of Shares.  The Company, during the term of this Plan,
          ---------------------                                             
will at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

          The inability of the Company to obtain authority from any regulatory
body having jurisdiction, which authority is deemed by the Company's counsel to
be necessary to the lawful issuance and sale of any Shares hereunder, shall
relieve the Company of any liability in respect of the failure to issue or sell
such Shares as to which such requisite authority shall not have been obtained.

     18.  Agreements.  Options and Stock Purchase Rights shall be evidenced by
          ----------                                                          
written agreements in such form as the Board shall approve from time to time.

     19.  Shareholder Approval.  Continuance of the Plan shall be subject to
          --------------------                                              
approval by the shareholders of the Company within twelve (12) months before or
after the date the Plan is adopted. Such shareholder approval shall be obtained
in the degree and manner required under applicable state and federal law.

     20.  Information to Optionees.  The Company shall provide to each Optionee,
          ------------------------                                              
during the period for which such Optionee has one or more Options outstanding,
copies of all annual reports and other information which are provided to all
shareholders of the Company. The Company shall not be required to provide such
information if the issuance of Options under the Plan is limited to key
employees whose duties in connection with the Company assure their access to
equivalent information.

                                      -12-

<PAGE>
 
                                                                     EXHIBIT 4.6

                                  RAMBUS INC.
                                1997 STOCK PLAN


     1.   Purposes of the Plan.  The purposes of this Stock Plan are:
          --------------------                                       

          .    to attract and retain the best available personnel for positions
               of substantial responsibility,

          .    to provide additional incentive to Employees, Directors and
               Consultants, and

          .    to promote the success of the Company's business.

     Options granted under the Plan may be Incentive Stock Options or
Nonstatutory Stock Options, as determined by the Administrator at the time of
grant. Stock Purchase Rights may also be granted under the Plan. The Plan also
provides for automatic grants of Nonstatutory Stock Options to Outside
Directors.

     2.   Definitions.  As used herein, the following definitions shall apply:
          -----------                                                         

          (a)  "Administrator" means the Board or any of its Committees as 
                -------------  
shall be administering the Plan, in accordance with Section 4 of the Plan.

          (b)  "Applicable Laws" means the requirements relating to the
                ---------------                                        
administration of stock option plans under U. S. state corporate laws, U.S.
federal and state securities laws, the Code, any stock exchange or quotation
system on which the Common Stock is listed or quoted and the applicable laws of
any foreign country or jurisdiction where Options or Stock Purchase Rights are,
or will be, granted under the Plan.

          (c)  "Board" means the Board of Directors of the Company.
                -----                                              

          (d)   "Code" means the Internal Revenue Code of 1986, as amended.
                 ----                                                      

          (e)  "Committee"  means a committee of Directors appointed by the 
                ---------   
Board in accordance with Section 4 of the Plan.

          (f)  "Common Stock" means the common stock of the Company.
                ------------                                        

          (g)  "Company" means Rambus Inc., a Delaware corporation.
                -------                                            

          (h)  "Consultant" means any person, including an advisor, engaged by 
                ----------  
the Company or a Parent or Subsidiary to render services to such entity.

          (i)  "Director" means a member of the Board.
                --------                              
<PAGE>
 
          (j)  "Disability" means total and permanent disability as defined in
                ----------                                                    
Section 22(e)(3) of the Code.

          (k)  "Employee" means any person, including Officers and Directors,
                --------                                                     
employed by the Company or any Parent or Subsidiary of the Company. A Service
Provider shall not cease to be an Employee in the case of (i) any leave of
absence approved by the Company or (ii) transfers between locations of the
Company or between the Company, its Parent, any Subsidiary, or any successor.
For purposes of Incentive Stock Options, no such leave may exceed ninety days,
unless reemployment upon expiration of such leave is guaranteed by statute or
contract. If reemployment upon expiration of a leave of absence approved by the
Company is not so guaranteed, on the 181st day of such leave any Incentive Stock
Option held by the Optionee shall cease to be treated as an Incentive Stock
Option and shall be treated for tax purposes as a Nonstatutory Stock Option.
Neither service as a Director nor payment of a director's fee by the Company
shall be sufficient to constitute "employment" by the Company.

          (l)  "Exchange Act" means the Securities Exchange Act of 1934, as
                ------------                                               
amended.

          (m)  "Fair Market Value" means, as of any date, the value of Common 
                -----------------
Stock determined as follows:

               (i)    If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the Nasdaq
National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its
Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the last market trading day prior to the time of determination, as reported in
The Wall Street Journal or such other source as the Administrator deems
reliable;

               (ii)   If the Common Stock is regularly quoted by a recognized
securities dealer but selling prices are not reported, the Fair Market Value of
a Share of Common Stock shall be the mean between the high bid and low asked
prices for the Common Stock on the last market trading day prior to the day of
determination, as reported in The Wall Street Journal or such other source as
the Administrator deems reliable; or

               (iii)  In the absence of an established market for the Common
Stock, the Fair Market Value shall be determined in good faith by the
Administrator.

          (n)  "Incentive Stock Option" means an Option intended to qualify as 
                ----------------------  
an incentive stock option within the meaning of Section 422 of the Code and the
regulations promulgated thereunder.

          (o)  "Inside Director" means a Director who is an Employee.  The term
                ---------------                                                
Inside Director shall include the founders, Mike Farmwald and Mark Horowitz.

                                      -2-
<PAGE>
 
          (p)  "Nonstatutory Stock Option" means an Option not intended to 
                -------------------------  
qualify as an Incentive Stock Option.

          (q)  "Notice of Grant" means a written or electronic notice evidencing
                ---------------                                                 
certain terms and conditions of an individual Option or Stock Purchase Right
grant.  The Notice of Grant is part of the Option Agreement.

          (r)  "Officer" means a person who is an officer of the Company within 
                -------  
the meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.

          (s)  "Option" means a stock option granted pursuant to the Plan.
                ------                                                    

          (t)  "Option Agreement" means an agreement between the Company and an
                ----------------                                               
Optionee evidencing the terms and conditions of an individual Option grant.  The
Option Agreement is subject to the terms and conditions of the Plan.

          (u)  "Option Exchange Program" means a program whereby outstanding
                -----------------------                                     
Options are surrendered in exchange for Options with a lower exercise price.

          (v)  "Outside Director" means a Director who is not an Employee;
                ----------------                                          
provided, however, that such term shall not include the founders, Mike Farmwald
and Mark Horowitz.

          (w)  "Optioned Stock" means the Common Stock subject to an Option or
                --------------                                                
Stock Purchase Right.

          (x)  "Optionee" means the holder of an outstanding Option or Stock
                --------                                                    
Purchase Right granted under the Plan.

          (y)  "Parent" means a "parent corporation," whether now or hereafter
                ------                                                        
existing, as defined in Section 424(e) of the Code.

          (z)  "Plan" means this 1997 Stock Plan.
                ----                             

          (aa) "Restricted Stock" means shares of Common Stock acquired 
                ----------------               
pursuant to a grant of Stock Purchase Rights under Section 11 of the Plan.

          (bb) "Restricted Stock Purchase Agreement" means a written agreement
                -----------------------------------                           
between the Company and the Optionee evidencing the terms and restrictions
applying to stock purchased under a Stock Purchase Right. The Restricted Stock
Purchase Agreement is subject to the terms and conditions of the Plan and the
Notice of Grant.

          (cc) "Rule 16b-3" means Rule 16b-3 of the Exchange Act or any 
                ----------  
successor to Rule 16b-3, as in effect when discretion is being exercised with
respect to the Plan.

                                      -3-
<PAGE>
 
          (dd) "Section 16(b)" means Section 16(b) of the Exchange Act.
                -------------                                          

          (ee) "Service Provider" means an Employee, Director or Consultant.
                ----------------                                            

          (ff) "Share" means a share of the Common Stock, as adjusted in
                -----   
accordance with Section 14 of the Plan.

          (gg) "Stock Purchase Right" means the right to purchase Common Stock
                --------------------                                          
pursuant to Section 11 of the Plan, as evidenced by a Notice of Grant.

          (hh) "Subsidiary" means a "subsidiary corporation", whether now or
                ----------                                                  
hereafter existing, as defined in Section 424(f) of the Code.

     3.   Stock Subject to the Plan.  Subject to the provisions of Section 14 of
          -------------------------                                             
the Plan, the maximum aggregate number of Shares which may be optioned and sold
under the Plan is 1,000,000 Shares, plus an annual increase as of the last day
of each of the Company's immediately preceding fiscal years during the term of
the Plan equal to the lesser of (i) the number of Shares needed to restore the
maximum aggregate number of Shares which may be optioned and sold under the Plan
to 1,000,000 Shares, (ii) four percent (4%) of the outstanding Shares on such
date, or (iii) a lesser amount determined by the Board. The Shares may be
authorized, but unissued, or reacquired Common Stock.

          If an Option or Stock Purchase Right expires or becomes unexercisable
without having been exercised in full, or is surrendered pursuant to an Option
Exchange Program, the unpurchased Shares which were subject thereto shall become
available for future grant or sale under the Plan (unless the Plan has
terminated); provided, however, that Shares that have actually been issued under
             --------                                                           
the Plan, whether upon exercise of an Option or Right, shall not be returned to
the Plan and shall not become available for future distribution under the Plan,
except that if Shares of Restricted Stock are repurchased by the Company at
their original purchase price, such Shares shall become available for future
grant under the Plan.

     4.   Administration of the Plan.
          -------------------------- 

          (a)  Procedure.
               --------- 

               (i)    Multiple Administrative Bodies. The Plan may be
                      ------------------------------   
administered by different Committees with respect to different groups of Service
Providers.

               (ii)   Section 162(m). To the extent that the Administrator
                      -------------
determines it to be desirable to qualify Options granted hereunder as
"performance-based compensation" within the meaning of Section 162(m) of the
Code, the Plan shall be administered by a Committee of two or more "outside
directors" within the meaning of Section 162(m) of the Code.

                                      -4-
<PAGE>
 
               (iii)  Rule 16b-3.  To the extent desirable to qualify 
                      ----------   
transactions hereunder as exempt under Rule 16b-3, the transactions contemplated
hereunder shall be structured to satisfy the requirements for exemption under
Rule 16b-3.

               (iv)   Grants to Outside Directors. All grants of Options to
                      ---------------------------
Outside Directors made pursuant to Section 13 of the Plan shall be automatic and
nondiscretionary.

               (v)    Other Administration. Other than as provided above, the
                      --------------------
Plan shall be administered by (A) the Board or (B) a Committee, which committee
shall be constituted to satisfy Applicable Laws.

          (b)  Powers of the Administrator.  Subject to the provisions of the 
               ---------------------------   
Plan, and in the case of a Committee, subject to the specific duties delegated
by the Board to such Committee, the Administrator shall have the authority, in
its discretion:

               (i)    to determine the Fair Market Value;

               (ii)   to select the Service Providers to whom Options and Stock
Purchase Rights may be granted hereunder;

               (iii)  to determine the number of shares of Common Stock to be
covered by each Option and Stock Purchase Right granted hereunder;

               (iv)   to approve forms of agreement for use under the Plan;

               (v)    to determine the terms and conditions, not inconsistent
with the terms of the Plan, of any Option or Stock Purchase Right granted
hereunder. Such terms and conditions include, but are not limited to, the
exercise price, the time or times when Options or Stock Purchase Rights may be
exercised (which may be based on performance criteria), any vesting acceleration
or waiver of forfeiture restrictions, and any restriction or limitation
regarding any Option or Stock Purchase Right of the shares of Common Stock
relating thereto, based in each case on such factors as the Administrator, in
its sole discretion, shall determine;

               (vi)   to reduce the exercise price of any Option or Stock
Purchase Right to the then current Fair Market Value if the Fair Market Value of
the Common Stock covered by such Option or Stock Purchase Right shall have
declined since the date the Option or Stock Purchase Right was granted;

               (vii)  to institute an Option Exchange Program;

              (viii)  to construe and interpret the terms of the Plan and awards
granted pursuant to the Plan;

                                      -5-
<PAGE>
 
               (ix)   to prescribe, amend and rescind rules and regulations
relating to the Plan, including rules and regulations relating to sub-plans
established for the purpose of qualifying for preferred tax treatment under
foreign tax laws;

               (x)    to modify or amend each Option or Stock Purchase Right
(subject to Section 16(c) of the Plan), including the discretionary authority to
extend the post-termination exercisability period of Options longer than is
otherwise provided for in the Plan;

               (xi)   to allow Optionees to satisfy withholding tax obligations
by electing to have the Company withhold from the Shares to be issued upon
exercise of an Option or Stock Purchase Right that number of Shares having a
Fair Market Value equal to the amount required to be withheld. The Fair Market
Value of the Shares to be withheld shall be determined on the date that the
amount of tax to be withheld is to be determined. All elections by an Optionee
to have Shares withheld for this purpose shall be made in such form and under
such conditions as the Administrator may deem necessary or advisable;

               (xii)  to authorize any person to execute on behalf of the
Company any instrument required to effect the grant of an Option or Stock
Purchase Right previously granted by the Administrator;

              (xiii)  to make all other determinations deemed necessary or
advisable for administering the Plan.

          (c)  Effect of Administrator's Decision.  The Administrator's 
               ----------------------------------   
decisions, determinations and interpretations shall be final and binding on all
Optionees and any other holders of Options or Stock Purchase Rights.

     5.   Eligibility.  Nonstatutory Stock Options and Stock Purchase Rights may
          -----------                                                           
be granted to Service Providers.  Incentive Stock Options may be granted only to
Employees.

     6.   Limitations.
          ----------- 

          (a)  Each Option shall be designated in the Option Agreement as either
an Incentive Stock Option or a Nonstatutory Stock Option.  However,
notwithstanding such designation, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Incentive Stock Options are
exercisable for the first time by the Optionee during any calendar year (under
all plans of the Company and any Parent or Subsidiary) exceeds $100,000, such
Options shall be treated as Nonstatutory Stock Options.  For purposes of this
Section 6(a), Incentive Stock Options shall be taken into account in the order
in which they were granted.  The Fair Market Value of the Shares shall be
determined as of the time the Option with respect to such Shares is granted.

          (b)  Neither the Plan nor any Option or Stock Purchase Right shall
confer upon an Optionee any right with respect to continuing the Optionee's
relationship as a Service Provider with

                                      -6-
<PAGE>
 
the Company, nor shall they interfere in any way with the Optionee's right or
the Company's right to terminate such relationship at any time, with or without
cause.

          (c)  The following limitations shall apply to grants of Options:

               (i)    No Service Provider shall be granted, in any fiscal year
of the Company, Options to purchase more than 250,000 Shares.

               (ii)   In connection with his or her initial service, a Service
Provider may be granted Options to purchase up to an additional 250,000 Shares
which shall not count against the limit set forth in subsection (i) above.

               (iii)  The foregoing limitations shall be adjusted
proportionately in connection with any change in the Company's capitalization as
described in Section 14.

               (iv)   If an Option is canceled in the same fiscal year of the
Company in which it was granted (other than in connection with a transaction
described in Section 14), the canceled Option will be counted against the limits
set forth in subsections (i) and (ii) above.  For this purpose, if the exercise
price of an Option is reduced, the transaction will be treated as a cancellation
of the Option and the grant of a new Option.

     7.   Term of Plan.  Subject to Section 20 of the Plan, the Plan shall 
          ------------   
become effective upon its adoption by the Board. It shall continue in effect for
a term of ten (10) years unless terminated earlier under Section 16 of the Plan.

     8.   Term of Option.  The term of each Option shall be stated in the Option
          --------------                                                        
Agreement. In the case of an Incentive Stock Option, the term shall be ten (10)
years from the date of grant or such shorter term as may be provided in the
Option Agreement. Moreover, in the case of an Incentive Stock Option granted to
an Optionee who, at the time the Incentive Stock Option is granted, owns stock
representing more than ten percent (10%) of the total combined voting power of
all classes of stock of the Company or any Parent or Subsidiary, the term of the
Incentive Stock Option shall be five (5) years from the date of grant or such
shorter term as may be provided in the Option Agreement.

     9.   Option Exercise Price and Consideration.
          --------------------------------------- 

          (a)  Exercise Price.  The per share exercise price for the Shares to 
               --------------   
be issued pursuant to exercise of an Option shall be determined by the
Administrator, subject to the following:

               (i)    In the case of an Incentive Stock Option

                      (A)  granted to an Employee who, at the time the Incentive
Stock Option is granted, owns stock representing more than ten percent (10%) of
the voting power of all classes of

                                      -7-
<PAGE>
 
stock of the Company or any Parent or Subsidiary, the per Share exercise price
shall be no less than 110% of the Fair Market Value per Share on the date of
grant.

                      (B) granted to any Employee other than an Employee
described in paragraph (A) immediately above, the per Share exercise price shall
be no less than 100% of the Fair Market Value per Share on the date of grant.

               (ii)   In the case of a Nonstatutory Stock Option, the per Share
exercise price shall be determined by the Administrator. In the case of a
Nonstatutory Stock Option intended to qualify as "performance-based
compensation" within the meaning of Section 162(m) of the Code, the per Share
exercise price shall be no less than 100% of the Fair Market Value per Share on
the date of grant.

               (iii)  Notwithstanding the foregoing, Options may be granted with
a per Share exercise price of less than 100% of the Fair Market Value per Share
on the date of grant pursuant to a merger or other corporate transaction.

          (b)  Waiting Period and Exercise Dates.  At the time an Option is
               ---------------------------------                           
granted, the Administrator shall fix the period within which the Option may be
exercised and shall determine any conditions which must be satisfied before the
Option may be exercised.

          (c)  Form of Consideration.  The Administrator shall determine the
               ---------------------                                        
acceptable form of consideration for exercising an Option, including the method
of payment. In the case of an Incentive Stock Option, the Administrator shall
determine the acceptable form of consideration at the time of grant. Such
consideration may consist entirely of:

               (i)    cash;

               (ii)   check;

               (iii)  promissory note;

               (iv)   other Shares which (A) in the case of Shares acquired upon
exercise of an option, have been owned by the Optionee for more than six months
on the date of surrender, and (B) have a Fair Market Value on the date of
surrender equal to the aggregate exercise price of the Shares as to which said
Option shall be exercised;

               (v)    consideration received by the Company under a cashless
exercise program implemented by the Company in connection with the Plan;

               (vi)   a reduction in the amount of any Company liability to the
Optionee, including any liability attributable to the Optionee's participation
in any Company-sponsored deferred compensation program or arrangement;

                                      -8-
<PAGE>
 
               (vii)  any combination of the foregoing methods of payment; or

               (viii) such other consideration and method of payment for the
issuance of Shares to the extent permitted by Applicable Laws.

     10.  Exercise of Option.
          ------------------ 

          (a)  Procedure for Exercise; Rights as a Stockholder.  Any Option 
               -----------------------------------------------    
granted hereunder shall be exercisable according to the terms of the Plan and at
such times and under such conditions as determined by the Administrator and set
forth in the Option Agreement. Unless the Administrator provides otherwise,
vesting of Options granted hereunder shall be tolled during any unpaid leave of
absence. An Option may not be exercised for a fraction of a Share.

               An Option shall be deemed exercised when the Company receives:
(i) written or electronic notice of exercise (in accordance with the Option
Agreement) from the person entitled to exercise the Option, and (ii) full
payment for the Shares with respect to which the Option is exercised.  Full
payment may consist of any consideration and method of payment authorized by the
Administrator and permitted by the Option Agreement and the Plan.  Shares issued
upon exercise of an Option shall be issued in the name of the Optionee or, if
requested by the Optionee, in the name of the Optionee and his or her spouse.
Until the Shares are issued (as evidenced by the appropriate entry on the books
of the Company or of a duly authorized transfer agent of the Company), no right
to vote or receive dividends or any other rights as a stockholder shall exist
with respect to the Optioned Stock, notwithstanding the exercise of the Option.
The Company shall issue (or cause to be issued) such Shares promptly after the
Option is exercised.  No adjustment will be made for a dividend or other right
for which the record date is prior to the date the Shares are issued, except as
provided in Section 14 of the Plan.

               Exercising an Option in any manner shall decrease the number of
Shares thereafter available, both for purposes of the Plan and for sale under
the Option, by the number of Shares as to which the Option is exercised.

          (b)  Termination of Relationship as a Service Provider.  If an 
               -------------------------------------------------   
Optionee ceases to be a Service Provider, other than upon the Optionee's death
or Disability, the Optionee may exercise his or her Option within such period of
time as is specified in the Option Agreement to the extent that the Option is
vested on the date of termination (but in no event later than the expiration of
the term of such Option as set forth in the Option Agreement).  In the absence
of a specified time in the Option Agreement, the Option shall remain exercisable
for three (3) months following the Optionee's termination.  If, on the date of
termination, the Optionee is not vested as to his or her entire Option, the
Shares covered by the unvested portion of the Option shall revert to the Plan.
If, after termination, the Optionee does not exercise his or her Option within
the time specified by the Administrator, the Option shall terminate, and the
Shares covered by such Option shall revert to the Plan.

                                      -9-
<PAGE>
 
          (c)  Disability of Optionee.  If an Optionee ceases to be a Service
               ----------------------                                        
Provider as a result of the Optionee's Disability, the Optionee may exercise his
or her Option within such period of time as is specified in the Option Agreement
to the extent the Option is vested on the date of termination (but in no event
later than the expiration of the term of such Option as set forth in the Option
Agreement). In the absence of a specified time in the Option Agreement, the
Option shall remain exercisable for twelve (12) months following the Optionee's
termination. If, on the date of termination, the Optionee is not vested as to
his or her entire Option, the Shares covered by the unvested portion of the
Option shall revert to the Plan. If, after termination, the Optionee does not
exercise his or her Option within the time specified herein, the Option shall
terminate, and the Shares covered by such Option shall revert to the Plan.

          (d)  Death of Optionee.  If an Optionee dies while a Service Provider,
               -----------------                                                
the Option may be exercised within such period of time as is specified in the
Option Agreement (but in no event later than the expiration of the term of such
Option as set forth in the Notice of Grant), by the Optionee's estate or by a
person who acquires the right to exercise the Option by bequest or inheritance,
but only to the extent that the Option is vested on the date of death.  In the
absence of a specified time in the Option Agreement, the Option shall remain
exercisable for twelve (12) months following the Optionee's termination.  If, at
the time of death, the Optionee is not vested as to his or her entire Option,
the Shares covered by the unvested portion of the Option shall immediately
revert to the Plan. The Option may be exercised by the executor or administrator
of the Optionee's estate or, if none, by the person(s) entitled to exercise the
Option under the Optionee's will or the laws of descent or distribution.  If the
Option is not so exercised within the time specified herein, the Option shall
terminate, and the Shares covered by such Option shall revert to the Plan.

          (e)  Buyout Provisions.  The Administrator may at any time offer to 
               -----------------   
buy out for a payment in cash or Shares an Option previously granted based on
such terms and conditions as the Administrator shall establish and communicate
to the Optionee at the time that such offer is made.

     11.  Stock Purchase Rights.
          --------------------- 

          (a)  Rights to Purchase.  Stock Purchase Rights may be issued either
               ------------------                                             
alone, in addition to, or in tandem with other awards granted under the Plan
and/or cash awards made outside of the Plan. After the Administrator determines
that it will offer Stock Purchase Rights under the Plan, it shall advise the
offeree in writing or electronically, by means of a Notice of Grant, of the
terms, conditions and restrictions related to the offer, including the number of
Shares that the offeree shall be entitled to purchase, the price to be paid, and
the time within which the offeree must accept such offer. The offer shall be
accepted by execution of a Restricted Stock Purchase Agreement in the form
determined by the Administrator.

          (b)  Repurchase Option.  Unless the Administrator determines 
               -----------------   
otherwise, the Restricted Stock Purchase Agreement shall grant the Company a
repurchase option exercisable upon the voluntary or involuntary termination of
the purchaser's service with the Company for any reason (including death or
Disability).  The purchase price for Shares repurchased pursuant to the
Restricted

                                      -10-
<PAGE>
 
Stock Purchase Agreement shall be the original price paid by the purchaser and
may be paid by cancellation of any indebtedness of the purchaser to the Company.
The repurchase option shall lapse at a rate determined by the Administrator.

          (c)  Other Provisions.  The Restricted Stock Purchase Agreement shall
               ----------------                                                
contain such other terms, provisions and conditions not inconsistent with the
Plan as may be determined by the Administrator in its sole discretion.

          (d)  Rights as a Stockholder.  Once the Stock Purchase Right is
               -----------------------                                   
exercised, the purchaser shall have the rights equivalent to those of a
stockholder, and shall be a stockholder when his or her purchase is entered upon
the records of the duly authorized transfer agent of the Company. No adjustment
will be made for a dividend or other right for which the record date is prior to
the date the Stock Purchase Right is exercised, except as provided in Section 14
of the Plan.

     12.  Non-Transferability of Options and Stock Purchase Rights.  Unless
          --------------------------------------------------------         
determined otherwise by the Administrator, an Option or Stock Purchase Right may
not be sold, pledged, assigned, hypothecated, transferred, or disposed of in any
manner other than by will or by the laws of descent or distribution and may be
exercised, during the lifetime of the Optionee, only by the Optionee. If the
Administrator makes an Option or Stock Purchase Right transferable, such Option
or Stock Purchase Right shall contain such additional terms and conditions as
the Administrator deems appropriate.

     13.  Automatic Option Grants to Outside Directors.
          -------------------------------------------- 

          (a)  First Option.  Each Outside Director who becomes an Outside
               ------------                                               
Director after the effective date of this Plan shall be automatically granted a
Nonstatutory Stock Option to purchase 10,000 Shares (the "First Option") on the
date on which such person first becomes an Outside Director, whether through
election by the stockholders of the Company or appointment by the Board to fill
a vacancy; provided, however, that an Inside Director who ceases to be an Inside
Director but who remains a Director shall not receive a First Option.

          (b)  Subsequent Option.  Each Outside Director shall be automatically
               -----------------                                               
granted a Nonstatutory Stock Option to purchase 5,000 Shares (a "Subsequent
Option") on October 1 of each year; provided that he or she is then an Outside
                                    --------                                  
Director and, provided further, that as of such date, he or she shall have
              -------- -------                                            
served on the Board for at least the preceding six (6) months.

          (c)  Terms of Options.  The terms of First Options and Subsequent 
               ----------------   
Options granted hereunder shall be as follows:

                    (A)  the term of each Option shall be ten (10) years.

                    (B)  the exercise price per Share shall be 100% of the Fair
Market Value per Share on the date of grant.  In the event that the date of
grant is not a trading day, the exercise price

                                      -11-
<PAGE>
 
per Share shall be the Fair Market Value on the next trading day immediately
following the date of grant.

                    (C)  12.5% of the Shares subject to the Option shall vest
six months after the date of grant, and 1/48 of the Shares subject to the Option
shall vest each month thereafter so that 100% of the Shares subject to the
Option shall be vested four (4) years from the grant date, subject to the
Optionee remaining a Service Provider as of such vesting dates.

     14.  Adjustments Upon Changes in Capitalization, Dissolution, Merger or
          ------------------------------------------------------------------
    Asset Sale.
    ---------- 

          (a)  Changes in Capitalization.  Subject to any required action by the
               -------------------------                                        
stockholders of the Company, the number of shares of Common Stock covered by
each outstanding Option and Stock Purchase Right, and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as to
which no Options or Stock Purchase Rights have yet been granted or which have
been returned to the Plan upon cancellation or expiration of an Option or Stock
Purchase Right, as well as the price per share of Common Stock covered by each
such outstanding Option or Stock Purchase Right, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration."  Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option or Stock
Purchase Right.

          (b)  Dissolution or Liquidation.  In the event of the proposed
               --------------------------                               
dissolution or liquidation of the Company, the Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction. The Administrator in its discretion may provide for an Optionee to
have the right to exercise his or her Option until ten (10) days prior to such
transaction as to all of the Optioned Stock covered thereby, including Shares as
to which the Option would not otherwise be exercisable. In addition, the
Administrator may provide that any Company repurchase option applicable to any
Shares purchased upon exercise of an Option or Stock Purchase Right shall lapse
as to all such Shares, provided the proposed dissolution or liquidation takes
place at the time and in the manner contemplated. To the extent it has not been
previously exercised, an Option or Stock Purchase Right will terminate
immediately prior to the consummation of such proposed action.

          (c)  Merger or Asset Sale.  In the event of a merger of the Company 
               --------------------
with or into another corporation, or the sale of substantially all of the assets
of the Company (a "Merger"), each outstanding Option and Stock Purchase Right
shall be assumed or an equivalent option or right

                                      -12-
<PAGE>
 
substituted by the successor corporation or a Parent or Subsidiary of the
successor corporation (the "Successor Corporation").

          Following such assumption or substitution in connection with a Merger,
if the Optionee's status as an Employee or employee of the Successor
Corporation, as applicable, is terminated by the Successor Corporation as a
result of an Involuntary Termination (as defined below) other than for Cause (as
defined below) within twelve months following a Merger, the Optionee shall fully
vest in and have the right to exercise Optionee's Option or Stock Purchase Right
as to all of the Optioned Stock, including Shares as to which Optionee would not
otherwise be vested or exercisable. Thereafter, the Option or Stock Purchase
Right shall remain exercisable in accordance with Sections 10(b) through (d)
above.

          For purposes of this section, any of the following events shall
constitute an "Involuntary Termination": (i) without the Employee's express
written consent, a significant reduction of the Employee's duties, authority or
responsibilities, relative to the Employee's duties, authority or
responsibilities as in effect immediately prior to the Merger, or the assignment
to Employee of such reduced duties, authority or responsibilities; (ii) without
the Employee's express written consent, a substantial reduction, without good
business reasons, of the facilities and perquisites (including office space and
location) available to the Employee immediately prior to the Merger; (iii) a
reduction by the Successor Corporation in the base salary of the Employee as in
effect immediately prior to the Merger; (iv) a material reduction by the
Successor Corporation in the kind or level of employee benefits, including
bonuses, to which the Employee was entitled immediately prior to the Merger with
the result that the Employee's overall benefits package is significantly
reduced; (v) the relocation of the Employee to a facility or a location more
than fifty (50) miles from the Employee's then present location, without the
Employee's express written consent; (vi) any purported termination of the
Employee by the Corporation which is not effected for Disability or for Cause,
or any purported termination for which the grounds relied upon are not valid;
(vii) or any act or set of facts or circumstances which would, under California
case law or statute constitute a constructive termination of the Employee.

          For purposes of this section, "Cause" shall mean (i) any act of
personal dishonesty taken by the Employee in connection with his
responsibilities as an employee and intended to result in substantial personal
enrichment of the Employee, (ii) the conviction of a felony, (iii) a willful act
by the Employee which constitutes gross misconduct and which is injurious to the
Successor Corporation, and (iv) following delivery to the Employee of a written
demand for performance from the Successor Corporation which describes the basis
for the Successor Corporation's belief that the Employee has not substantially
performed his duties, continued violations by the Employee of the Employee's
obligations to the Successor which are demonstrably willful and deliberate on
the Employee's part.

          In the event that the Successor Corporation refuses to assume or
substitute for the Option or Stock Purchase Right, the Optionee shall fully vest
in and have the right to exercise the Option or Stock Purchase Right as to all
of the Optioned Stock, including Shares as to which 

                                      -13-
<PAGE>
 
Optionee would not otherwise be vested or exercisable. If an Option or Stock
Purchase Right becomes fully vested and exercisable in lieu of assumption or
substitution in the event of a merger or sale of assets, the Administrator shall
notify the Optionee in writing or electronically that the Option or Stock
Purchase Right shall be fully vested and exercisable for a period of fifteen
(15) days from the date of such notice, and the Option or Stock Purchase Right
shall terminate upon the expiration of such period. For the purposes of this
paragraph, the Option or Stock Purchase Right shall be considered assumed if,
following the merger or sale of assets, the option or right confers the right to
purchase or receive, for each Share of Optioned Stock subject to the Option or
Stock Purchase Right immediately prior to the merger or sale of assets, the
consideration (whether stock, cash, or other securities or property) received in
the merger or sale of assets by holders of Common Stock for each Share held on
the effective date of the transaction (and if holders were offered a choice of
consideration, the type of consideration chosen by the holders of a majority of
the outstanding Shares); provided, however, that if such consideration received
in the merger or sale of assets is not solely common stock of the Successor
Corporation or its Parent, the Administrator may, with the consent of the
Successor Corporation, provide for the consideration to be received upon the
exercise of the Option or Stock Purchase Right, for each Share of Optioned Stock
subject to the Option or Stock Purchase Right, to be solely common stock of the
Successor Corporation or its Parent equal in fair market value to the per share
consideration received by holders of Common Stock in the merger or sale of
assets.

     15.  Date of Grant.  The date of grant of an Option or Stock Purchase Right
          -------------                                                         
shall be, for all purposes, the date on which the Administrator makes the
determination granting such Option or Stock Purchase Right, or such other later
date as is determined by the Administrator. Notice of the determination shall be
provided to each Optionee within a reasonable time after the date of such grant.

     16.  Amendment and Termination of the Plan.
          ------------------------------------- 

          (a)  Amendment and Termination.  The Board may at any time amend, 
               -------------------------       
alter, suspend or terminate the Plan.

          (b)  Stockholder Approval.  The Company shall obtain stockholder 
               --------------------   
approval of any Plan amendment to the extent necessary and desirable to comply
with Applicable Laws.

          (c)  Effect of Amendment or Termination.  No amendment, alteration,
               ----------------------------------                            
suspension or termination of the Plan shall impair the rights of any Optionee,
unless mutually agreed otherwise between the Optionee and the Administrator,
which agreement must be in writing and signed by the Optionee and the Company.
Termination of the Plan shall not affect the Administrator's ability to exercise
the powers granted to it hereunder with respect to Options granted under the
Plan prior to the date of such termination.

                                      -14-
<PAGE>
 
     17.  Conditions Upon Issuance of Shares.
          ---------------------------------- 

          (a)  Legal Compliance.  Shares shall not be issued pursuant to the
               ----------------                                             
exercise of an Option or Stock Purchase Right unless the exercise of such Option
or Stock Purchase Right and the issuance and delivery of such Shares shall
comply with Applicable Laws and shall be further subject to the approval of
counsel for the Company with respect to such compliance.

          (b)  Investment Representations.  As a condition to the exercise of an
               --------------------------                                       
Option or Stock Purchase Right, the Company may require the person exercising
such Option or Stock Purchase Right to represent and warrant at the time of any
such exercise that the Shares are being purchased only for investment and
without any present intention to sell or distribute such Shares if, in the
opinion of counsel for the Company, such a representation is required.

     18.  Inability to Obtain Authority.  The inability of the Company to obtain
          -----------------------------                                         
authority from any regulatory body having jurisdiction, which authority is
deemed by the Company's counsel to be necessary to the lawful issuance and sale
of any Shares hereunder, shall relieve the Company of any liability in respect
of the failure to issue or sell such Shares as to which such requisite authority
shall not have been obtained.

     19.  Reservation of Shares.  The Company, during the term of this Plan, 
          ---------------------   
will at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

     20.  Stockholder Approval.  The Plan shall be subject to approval by the 
          --------------------                                           
stockholders of the Company within twelve (12) months after the date the Plan is
adopted. Such stockholder approval shall be obtained in the manner and to the
degree required under Applicable Laws.

                                      -15-
<PAGE>
 
                                1997 STOCK PLAN

                            STOCK OPTION AGREEMENT


     Unless otherwise defined herein, the terms defined in the Plan shall have
the same defined meanings in this Option Agreement.

I.   NOTICE OF STOCK OPTION GRANT
     ----------------------------

[Optionee's Name and Address]

     You have been granted an option to purchase Common Stock of the Company,
subject to the terms and conditions of the Plan and this Option Agreement, as
follows:

     Grant Number                      _________________________
                                  
     Date of Grant                     _________________________
                                  
     Vesting Commencement Date         _________________________
                                  
     Exercise Price per Share          $________________________
                                  
     Total Number of Shares Granted    _________________________
                                  
     Total Exercise Price              $_________________________
                                  
     Type of Option:                   ___  Incentive Stock Option
                                  
                                       ___  Nonstatutory Stock Option
                                  
     Term/Expiration Date:             _________________________


Vesting Schedule:
- ---------------- 

     This Option may be exercised, in whole or in part, in accordance with the
following schedule:

     12.5% of the Shares subject to the Option shall vest six months after the
date of grant, and 1/48 of the Shares subject to the Option shall vest each
month thereafter so that 100% of the Shares subject to the Option shall be
vested four (4) years from the grant date, subject to the Optionee remaining a
Service Provider as of such vesting dates.
<PAGE>
 
     Termination Period:
     ------------------ 

     This Option may be exercised for [THREE MONTHS] after Optionee ceases to be
a Service Provider.  Upon the death or Disability of the Optionee, this Option
may be exercised for such longer period as provided in the Plan.  In no event
shall this Option be exercised later than the Term/Expiration Date as provided
above.

II.  AGREEMENT
     ---------

     1.   Grant of Option.  The Plan Administrator of the Company hereby grants 
          ---------------   
to the Optionee named in the Notice of Grant attached as Part I of this
Agreement (the "Optionee") an option (the "Option") to purchase the number of
Shares, as set forth in the Notice of Grant, at the exercise price per share set
forth in the Notice of Grant (the "Exercise Price"), subject to the terms and
conditions of the Plan, which is incorporated herein by reference.  Subject to
Section 16(c) of the Plan, in the event of a conflict between the terms and
conditions of the Plan and the terms and conditions of this Option Agreement,
the terms and conditions of the Plan shall prevail.

          If designated in the Notice of Grant as an Incentive Stock Option
("ISO"), this Option is intended to qualify as an Incentive Stock Option under
Section 422 of the Code.  However, if this Option is intended to be an Incentive
Stock Option, to the extent that it exceeds the $100,000 rule of Code Section
422(d) it shall be treated as a Nonstatutory Stock Option ("NSO").

     2.   Exercise of Option.
          ------------------ 

          (a)  Right to Exercise.  This Option is exercisable during its term in
               -----------------                                                
accordance with the Vesting Schedule set out in the Notice of Grant and the
applicable provisions of the Plan and this Option Agreement.

          (b)  Method of Exercise.  This Option is exercisable by delivery of an
               ------------------                                               
exercise notice, in the form attached as Exhibit A (the "Exercise Notice"),
which shall state the election to exercise the Option, the number of Shares in
respect of which the Option is being exercised (the "Exercised Shares"), and
such other representations and agreements as may be required by the Company
pursuant to the provisions of the Plan.  The Exercise Notice shall be completed
by the Optionee and delivered to [Title] of the Company.  The Exercise Notice
shall be accompanied by payment of the aggregate Exercise Price as to all
Exercised Shares.  This Option shall be deemed to be exercised upon receipt by
the Company of such fully executed Exercise Notice accompanied by such aggregate
Exercise Price.

          No Shares shall be issued pursuant to the exercise of this Option
unless such issuance and exercise complies with Applicable Laws.  Assuming such
compliance, for income tax purposes the Exercised Shares shall be considered
transferred to the Optionee on the date the Option is exercised with respect to
such Exercised Shares.

                                      -2-
<PAGE>
 
     3.   Method of Payment.  Payment of the aggregate Exercise Price shall be 
          -----------------   
by any of the following, or a combination thereof, at the election of the
Optionee:

          (a)  cash;

          (b)  check;

          (c)  consideration received by the Company under a cashless exercise
program implemented by the Company in connection with the Plan; or

          (d)  surrender of other Shares which (i) in the case of Shares
acquired upon exercise of an option, have been owned by the Optionee for more
than six (6) months on the date of surrender, and (ii) have a Fair Market Value
on the date of surrender equal to the aggregate Exercise Price of the Exercised
Shares; or

          (e)  with the Administrator's consent, delivery of Optionee's
promissory note (the "Note") in the form attached hereto as Exhibit C, in the
amount of the aggregate Exercise Price of the Exercised Shares together with the
execution and delivery by the Optionee of the Security Agreement attached hereto
as Exhibit B.  The Note shall bear interest at the "applicable federal rate"
prescribed under the Code and its regulations at time of purchase, and shall be
secured by a pledge of the Shares purchased by the Note pursuant to the Security
Agreement.

     4.   Non-Transferability of Option.  This Option may not be transferred in
          -----------------------------                                        
any manner otherwise than by will or by the laws of descent or distribution and
may be exercised during the lifetime of Optionee only by the Optionee.  The
terms of the Plan and this Option Agreement shall be binding upon the executors,
administrators, heirs, successors and assigns of the Optionee.

     5.   Term of Option.  This Option may be exercised only within the term set
          --------------                                                        
out in the Notice of Grant, and may be exercised during such term only in
accordance with the Plan and the terms of this Option Agreement.

     6.   Tax Consequences.  Some of the federal tax consequences relating to 
          ----------------   
this Option, as of the date of this Option, are set forth below.  THIS SUMMARY
IS NECESSARILY INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO
CHANGE.  THE OPTIONEE SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THIS OPTION
OR DISPOSING OF THE SHARES.

          (a)  Exercising the Option.
               --------------------- 

               (i)    Nonstatutory Stock Option.  The Optionee may incur 
                      -------------------------   
regular federal income tax liability upon exercise of a NSO.  The Optionee will
be treated as having received compensation income (taxable at ordinary income
tax rates) equal to the excess, if any, of the Fair Market Value of the
Exercised Shares on the date of exercise over their aggregate Exercise Price.  
If the Optionee is

                                      -3-
<PAGE>
 
an Employee or a former Employee, the Company will be required to withhold from
his or her compensation or collect from Optionee and pay to the applicable
taxing authorities an amount in cash equal to a percentage of this compensation
income at the time of exercise, and may refuse to honor the exercise and refuse
to deliver Shares if such withholding amounts are not delivered at the time of
exercise.

               (ii)   Incentive Stock Option.  If this Option qualifies as an 
                      ----------------------   
ISO, the Optionee will have no regular federal income tax liability upon its
exercise, although the excess, if any, of the Fair Market Value of the Exercised
Shares on the date of exercise over their aggregate Exercise Price will be
treated as an adjustment to alternative minimum taxable income for federal tax
purposes and may subject the Optionee to alternative minimum tax in the year of
exercise.  In the event that the Optionee ceases to be an Employee but remains a
Service Provider, any Incentive Stock Option of the Optionee that remains
unexercised shall cease to qualify as an Incentive Stock Option and will be
treated for tax purposes as a Nonstatutory Stock Option on the date three (3)
months and one (1) day following such change of status.

          (b)  Disposition of Shares.
               --------------------- 

               (i)    NSO.  If the Optionee holds NSO Shares for at least one 
                      ---   
year, any gain realized on disposition of the Shares will be treated as long-
term capital gain for federal income tax purposes.

               (ii)   ISO.  If the Optionee holds ISO Shares for at least one 
                      ---   
year after exercise and two years after the grant date, any gain realized on
disposition of the Shares will be treated as long-term capital gain for federal
income tax purposes.  If the Optionee disposes of ISO Shares within one year
after exercise or two years after the grant date, any gain realized on such
disposition will be treated as compensation income (taxable at ordinary income
rates) to the extent of the excess, if any, of the lesser of (A) the difference
between the Fair Market Value of the Shares acquired on the date of exercise and
the aggregate Exercise Price, or (B) the difference between the sale price of
such Shares and the aggregate Exercise Price.  Any additional gain will be taxed
as capital gain, short-term or long-term depending on the period that the ISO
Shares were held.

          (c)  Notice of Disqualifying Disposition of ISO Shares.  If the 
               -------------------------------------------------   
Optionee sells or otherwise disposes of any of the Shares acquired pursuant to
an ISO on or before the later of (i) two years after the grant date, or (ii) one
year after the exercise date, the Optionee shall immediately notify the Company
in writing of such disposition.  The Optionee agrees that he or she may be
subject to income tax withholding by the Company on the compensation income
recognized from such early disposition of ISO Shares by payment in cash or out
of the current earnings paid to the Optionee.

     7.   Entire Agreement; Governing Law.  The Plan is incorporated herein by
          -------------------------------                                     
reference.  The Plan and this Option Agreement constitute the entire agreement
of the parties with respect to the subject matter hereof and supersede in their
entirety all prior undertakings and agreements of the Company and Optionee with
respect to the subject matter hereof, and may not be modified adversely 

                                      -4-
<PAGE>
 
to the Optionee's interest except by means of a writing signed by the Company
and Optionee.  This agreement is governed by the internal substantive laws, but
not the choice of law rules, of California.

     8.   NO GUARANTEE OF CONTINUED SERVICE.  OPTIONEE ACKNOWLEDGES AND AGREES
          ---------------------------------                                   
THAT THE VESTING OF SHARES PURSUANT TO THE VESTING SCHEDULE HEREOF IS EARNED
ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY (AND NOT
THROUGH THE ACT OF BEING HIRED, BEING GRANTED AN OPTION OR PURCHASING SHARES
HEREUNDER).  OPTIONEE FURTHER ACKNOWLEDGES AND AGREES THAT THIS AGREEMENT, THE
TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE SET FORTH HEREIN DO
NOT CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF CONTINUED ENGAGEMENT AS A
SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY PERIOD, OR AT ALL, AND SHALL
NOT INTERFERE WITH OPTIONEE'S RIGHT OR THE COMPANY'S RIGHT TO TERMINATE
OPTIONEE'S RELATIONSHIP AS A SERVICE PROVIDER AT ANY TIME, WITH OR WITHOUT
CAUSE.

     By your signature and the signature of the Company's representative below,
you and the Company agree that this Option is granted under and governed by the
terms and conditions of the Plan and this Option Agreement.  Optionee has
reviewed the Plan and this Option Agreement in their entirety, has had an
opportunity to obtain the advice of counsel prior to executing this Option
Agreement and fully understands all provisions of the Plan and Option Agreement.
Optionee hereby agrees to accept as binding, conclusive and final all decisions
or interpretations of the Administrator upon any questions relating to the Plan
and Option Agreement.  Optionee further agrees to notify the Company upon any
change in the residence address indicated below.


OPTIONEE:                              RAMBUS INC.

_____________________________          _________________________________________
Signature                              By

_____________________________          _________________________________________
Print Name                             Title

_____________________________
Residence Address

_____________________________
                                   EXHIBIT A
                                   ---------

                                1997 STOCK PLAN

                                EXERCISE NOTICE

                                      -5-
<PAGE>
 
Rambus Inc.
2465 Latham Drive
Mountain View, CA 94040


Attention:  Secretary

     9.   Exercise of Option.  Effective as of today, ________________, 199__, 
          ------------------   
the undersigned ("Purchaser") hereby elects to purchase ______________ shares
(the "Shares") of the Common Stock of Rambus Inc. (the "Company") under and
pursuant to the 1997 Stock Plan (the "Plan") and the Stock Option Agreement
dated _____________, 19___ (the "Option Agreement").  The purchase price for the
Shares shall be $_____________, as required by the Option Agreement.

     10.  Delivery of Payment.  Purchaser herewith delivers to the Company the
          -------------------                                                 
full purchase price for the Shares.

     11.  Representations of Purchaser.  Purchaser acknowledges that Purchaser 
          ----------------------------   
has received, read and understood the Plan and the Option Agreement and agrees
to abide by and be bound by their terms and conditions.

     12.  Rights as Stockholder.  Until the issuance (as evidenced by the
          ---------------------                                          
appropriate entry on the books of the Company or of a duly authorized transfer
agent of the Company) of the Shares, no right to vote or receive dividends or
any other rights as a stockholder shall exist with respect to the Optioned
Stock, notwithstanding the exercise of the Option.  The Shares so acquired shall
be issued to the Optionee as soon as practicable after exercise of the Option.
No adjustment will be made for a dividend or other right for which the record
date is prior to the date of issuance, except as provided in Section 14 of the
Plan.

     13.  Tax Consultation.  Purchaser understands that Purchaser may suffer
          ----------------                                                  
adverse tax consequences as a result of Purchaser's purchase or disposition of
the Shares.  Purchaser represents that Purchaser has consulted with any tax
consultants Purchaser deems advisable in connection with the purchase or
disposition of the Shares and that Purchaser is not relying on the Company for
any tax advice.

     14.  Entire Agreement; Governing Law.  The Plan and Option Agreement are
          -------------------------------                                    
incorporated herein by reference.  This Agreement, the Plan and the Option
Agreement constitute the entire agreement of the parties with respect to the
subject matter hereof and supersede in their entirety all prior undertakings and
agreements of the Company and Purchaser with respect to the subject matter
hereof, and may not be modified adversely to the Purchaser's interest except by
means of a writing 

                                      -6-
<PAGE>
 
signed by the Company and Purchaser.  This agreement is governed by the internal
substantive laws, but not the choice of law rules, of California.


Submitted by:                          Accepted by:

PURCHASER:                             RAMBUS INC.


_____________________________          _________________________________________
Signature                              By

_____________________________          _________________________________________
Print Name                             Title


Address:                               Address:
- -------                                ------- 

_____________________________          Rambus Inc.
                                       2465 Latham Drive
_____________________________          Mountain View, CA 94040

                                       _________________________________________
                                       Date Received

                                      -7-
<PAGE>
 
                                   EXHIBIT B
                                   ---------

                              SECURITY AGREEMENT



     This Security Agreement is made as of __________, 19___ between Rambus
Inc., a Delaware corporation ("Pledgee"), and _________________________
("Pledgor").


                                   Recitals
                                   --------

     Pursuant to Pledgor's election to purchase Shares under the Option
Agreement dated ________ (the "Option"), between Pledgor and Pledgee under
Pledgee's 1997 Stock Plan, and Pledgor's election under the terms of the Option
to pay for such shares with his promissory note (the "Note"), Pledgor has
purchased _________ shares of Pledgee's Common Stock (the "Shares") at a price
of $________ per share, for a total purchase price of $__________.  The Note and
the obligations thereunder are as set forth in Exhibit C to the Option.

     NOW, THEREFORE, it is agreed as follows:

     1.   Creation and Description of Security Interest.  In consideration of 
          ---------------------------------------------   
the transfer of the Shares to Pledgor under the Option Agreement, Pledgor,
pursuant to the California Commercial Code, hereby pledges all of such Shares
(herein sometimes referred to as the "Collateral") represented by certificate
number ______, duly endorsed in blank or with executed stock powers, and
herewith delivers said certificate to the Secretary of Pledgee ("Pledgeholder"),
who shall hold said certificate subject to the terms and conditions of this
Security Agreement.

     The pledged stock (together with an executed blank stock assignment for use
in transferring all or a portion of the Shares to Pledgee if, as and when
required pursuant to this Security Agreement) shall be held by the Pledgeholder
as security for the repayment of the Note, and any extensions or renewals
thereof, to be executed by Pledgor pursuant to the terms of the Option, and the
Pledge  holder shall not encumber or dispose of such Shares except in accordance
with the provisions of this Security Agreement.

     2.   Pledgor's Representations and Covenants.  To induce Pledgee to enter
          ---------------------------------------                             
into this Security Agreement, Pledgor represents and covenants to Pledgee, its
successors and assigns, as follows:

          a.   Payment of Indebtedness.  Pledgor will pay the principal sum of 
               -----------------------   
the Note secured hereby, together with interest thereon, at the time and in the
manner provided in the Note.

          b.   Encumbrances.  The Shares are free of all other encumbrances,
               ------------                                                 
defenses and liens, and Pledgor will not further encumber the Shares without the
prior written consent of Pledgee.

          c.   Margin Regulations.  In the event that Pledgee's Common Stock is 
               ------------------      
now or later becomes margin-listed by the Federal Reserve Board and Pledgee is
classified as a "lender" within the 
<PAGE>
 
meaning of the regulations under Part 207 of Title 12 of the Code of Federal
Regulations ("Regulation G"), Pledgor agrees to cooperate with Pledgee in making
any amendments to the Note or providing any additional collateral as may be
necessary to comply with such regulations.

     3.   Voting Rights.  During the term of this pledge and so long as all
          -------------                                                    
payments of principal and interest are made as they become due under the terms
of the Note, Pledgor shall have the right to vote all of the Shares pledged
hereunder.

     4.   Stock Adjustments.  In the event that during the term of the pledge 
          -----------------   
any stock dividend, reclassification, readjustment or other changes are declared
or made in the capital structure of Pledgee, all new, substituted and additional
shares or other securities issued by reason of any such change shall be
delivered to and held by the Pledgee under the terms of this Security Agreement
in the same manner as the Shares originally pledged hereunder.  In the event of
substitution of such securities, Pledgor, Pledgee and Pledgeholder shall
cooperate and execute such documents as are reasonable so as to provide for the
substitution of such Collateral and, upon such substitution, references to
"Shares" in this Security Agreement shall include the substituted shares of
capital stock of Pledgor as a result thereof.

     5.   Options and Rights.  In the event that, during the term of this 
          ------------------   
pledge, subscription Options or other rights or options shall be issued in
connection with the pledged Shares, such rights, Options and options shall be
the property of Pledgor and, if exercised by Pledgor, all new stock or other
securities so acquired by Pledgor as it relates to the pledged Shares then held
by Pledgeholder shall be immediately delivered to Pledgeholder, to be held under
the terms of this Security Agreement in the same manner as the Shares pledged.

     6.   Default.  Pledgor shall be deemed to be in default of the Note and of
          -------                                                              
this Security Agreement in the event:

          a.   Payment of principal or interest on the Note shall be delinquent
for a period of 10 days or more; or

          b.   Pledgor fails to perform any of the covenants set forth in the
Option or contained in this Security Agreement for a period of 10 days after
written notice thereof from Pledgee.

     In the case of an event of Default, as set forth above, Pledgee shall have
the right to accelerate payment of the Note upon notice to Pledgor, and Pledgee
shall thereafter be entitled to pursue its remedies under the California
Commercial Code.

     7.   Release of Collateral.  Subject to any applicable contrary rules under
          ---------------------                                                 
Regulation G, there shall be released from this pledge a portion of the pledged
Shares held by Pledgeholder hereunder upon payments of the principal of the
Note.  The number of the pledged Shares which shall be released shall be that
number of full Shares which bears the same proportion to the initial number of

                                      -2-
<PAGE>
 
Shares pledged hereunder as the payment of principal bears to the initial full
principal amount of the Note.

     8.   Withdrawal or Substitution of Collateral.  Pledgor shall not sell,
          ----------------------------------------                          
withdraw, pledge, substitute or otherwise dispose of all or any part of the
Collateral without the prior written consent of Pledgee.

     9.   Term.  The within pledge of Shares shall continue until the payment of
          ----                                                                  
all indebtedness secured hereby, at which time the remaining pledged stock shall
be promptly delivered to Pledgor, subject to the provisions for prior release of
a portion of the Collateral as provided in paragraph 7 above.

     10.  Insolvency.  Pledgor agrees that if a bankruptcy or insolvency
          ----------                                                    
proceeding is instituted by or against it, or if a receiver is appointed for the
property of Pledgor, or if Pledgor makes an assignment for the benefit of
creditors, the entire amount unpaid on the Note shall become immediately due and
payable, and Pledgee may proceed as provided in the case of default.

     11.  Pledgeholder Liability.  In the absence of willful or gross 
          ----------------------      
negligence, Pledgeholder shall not be liable to any party for any of his acts,
or omissions to act, as Pledgeholder.

     12.  Invalidity of Particular Provisions.  Pledgor and Pledgee agree that 
          -----------------------------------   
the enforceability or invalidity of any provision or provisions of this Security
Agreement shall not render any other provision or provisions herein contained
unenforceable or invalid.

     13.  Successors or Assigns.  Pledgor and Pledgee agree that all of the 
          ---------------------   
terms of this Security Agreement shall be binding on their respective successors
and assigns, and that the term "Pledgor" and the term "Pledgee" as used herein
shall be deemed to include, for all purposes, the respective designees,
successors, assigns, heirs, executors and administrators.

     14.  Governing Law.  This Security Agreement shall be interpreted and
          -------------                                                   
governed under the internal substantive laws, but not the choice of law rules,
of California.

                                      -3-
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the day and year first above written.



     "PLEDGOR"                         _________________________________
                                       Signature

                                       _________________________________
                                       Print Name

                        Address:       _________________________________

                                       _________________________________


     "PLEDGEE"                         Rambus Inc.,
                                       a Delaware corporation


                                       ________________________________
                                       Signature

                                       ________________________________
                                       Print Name

                                       ________________________________
                                       Title


     "PLEDGEHOLDER"                    ________________________________
                                       Secretary of
                                       Rambus Inc.

                                      -4-
<PAGE>
 
                                   EXHIBIT C
                                   ---------

                                     NOTE


$_______________                                                  [City, State]


                                                           ______________, 19___

     FOR VALUE RECEIVED, _______________ promises to pay to Rambus Inc., a
Delaware corporation (the "Company"), or order, the principal sum of
_______________________ ($_____________), together with interest on the unpaid
principal hereof from the date hereof at the rate of _______________ percent
(____%) per annum, compounded semiannually.

     Principal and interest shall be due and payable on __________, 19___.
Payment of principal and interest shall be made in lawful money of the United
States of America.

     The undersigned may at any time prepay all or any portion of the principal
or interest owing hereunder.

     This Note is subject to the terms of the Option, dated as of
________________.  This Note is secured in part by a pledge of the Company's
Common Stock under the terms of a Security Agreement of even date herewith and
is subject to all the provisions thereof.

     The holder of this Note shall have full recourse against the undersigned,
and shall not be required to proceed against the collateral securing this Note
in the event of default.

     In the event the undersigned shall cease to be an employee, director or
consultant of the Company for any reason, this Note shall, at the option of the
Company, be accelerated, and the whole unpaid balance on this Note of principal
and accrued interest shall be immediately due and payable.

     Should any action be instituted for the collection of this Note, the
reasonable costs and attorneys' fees therein of the holder shall be paid by the
undersigned.


                                       ____________________________________

                                       ____________________________________
<PAGE>
 
                                1997 STOCK PLAN

                    NOTICE OF GRANT OF STOCK PURCHASE RIGHT


     Unless otherwise defined herein, the terms defined in the Plan shall have
the same defined meanings in this Notice of Grant.

[Grantee's Name and Address]

     You have been granted the right to purchase Common Stock of the Company,
subject to the Company's Repurchase Option and your ongoing status as a Service
Provider (as described in the Plan and the attached Restricted Stock Purchase
Agreement), as follows:

     Grant Number                      _________________________

     Date of Grant                     _________________________

     Price Per Share                   $________________________

     Total Number of Shares Subject    _________________________
      to This Stock Purchase Right

     Expiration Date:                  _________________________


     YOU MUST EXERCISE THIS STOCK PURCHASE RIGHT BEFORE THE EXPIRATION DATE OR
IT WILL TERMINATE AND YOU WILL HAVE NO FURTHER RIGHT TO PURCHASE THE SHARES.  By
your signature and the signature of the Company's representative below, you and
the Company agree that this Stock Purchase Right is granted under and governed
by the terms and conditions of the 1997 Stock Plan and the Restricted Stock
Purchase Agreement, attached hereto as Exhibit A-1, both of which are made a
part of this document.  You further agree to execute the attached Restricted
Stock Purchase Agreement as a condition to purchasing any shares under this
Stock Purchase Right.

GRANTEE:                               RAMBUS INC.


_____________________________          ________________________________
Signature                              By

_____________________________          ________________________________
Print Name                             Title
<PAGE>
 
                                  EXHIBIT A-1
                                  -----------

                                1997 STOCK PLAN

                      RESTRICTED STOCK PURCHASE AGREEMENT

     Unless otherwise defined herein, the terms defined in the Plan shall have
the same defined meanings in this Restricted Stock Purchase Agreement.

     WHEREAS the Purchaser named in the Notice of Grant, (the "Purchaser") is an
Service Provider, and the Purchaser's continued participation is considered by
the Company to be important for the Company's continued growth; and

     WHEREAS in order to give the Purchaser an opportunity to acquire an equity
interest in the Company as an incentive for the Purchaser to participate in the
affairs of the Company, the Admin  istrator has granted to the Purchaser a Stock
Purchase Right subject to the terms and conditions of the Plan and the Notice of
Grant, which are incorporated herein by reference, and pursuant to this
Restricted Stock Purchase Agreement (the "Agreement").

     NOW THEREFORE, the parties agree as follows:

     1.   Sale of Stock.  The Company hereby agrees to sell to the Purchaser and
          -------------                                                         
the Purchaser hereby agrees to purchase shares of the Company's Common Stock
(the "Shares"), at the per Share purchase price and as otherwise described in
the Notice of Grant.

     2.   Payment of Purchase Price.  The purchase price for the Shares may be
          -------------------------                                           
paid by delivery to the Company at the time of execution of this Agreement of
cash, a check, or some combination thereof.

     3.   Repurchase Option.
          ----------------- 

          (a)  In the event the Purchaser ceases to be a Service Provider for
any or no reason (including death or disability) before all of the Shares are
released from the Company's Repurchase Option (see Section 4), the Company
shall, upon the date of such termination (as reasonably fixed and determined by
the Company) have an irrevocable, exclusive option (the "Repurchase Option") for
a period of sixty (60) days from such date to repurchase up to that number of
shares which constitute the Unreleased Shares (as defined in Section 4) at the
original purchase price per share (the "Repurchase Price").  The Repurchase
Option shall be exercised by the Company by delivering written notice to the
Purchaser or the Purchaser's executor (with a copy to the Escrow Holder) AND, at
the Company's option, (i) by delivering to the Purchaser or the Purchaser's
executor a check in the amount of the aggregate Repurchase Price, or (ii) by
canceling an amount of the Purchaser's indebtedness to the Company equal to the
aggregate Repurchase Price, or (iii) by a combination of (i) and (ii) so that
the combined payment and cancellation of indebtedness equals the aggregate
Repurchase Price.  Upon delivery of such notice and the payment of the aggregate
Repurchase Price, the Company shall become the legal and beneficial owner of the
Shares being repurchased and all
<PAGE>
 
rights and interests therein or relating thereto, and the Company shall have the
right to retain and transfer to its own name the number of Shares being
repurchased by the Company.

          (b)  Whenever the Company shall have the right to repurchase Shares
hereunder, the Company may designate and assign one or more employees, officers,
directors or stockholders of the Company or other persons or organizations to
exercise all or a part of the Company's purchase rights under this Agreement and
purchase all or a part of such Shares.  If the Fair Market Value of the Shares
to be repurchased on the date of such designation or assignment (the "Repurchase
FMV") exceeds the aggregate Repurchase Price of such Shares, then each such
designee or assignee shall pay the Company cash equal to the difference between
the Repurchase FMV and the aggregate Repurchase Price of such Shares.

     4.   Release of Shares From Repurchase Option.
          ---------------------------------------- 

          (a)  _______________________  percent (______%) of the Shares shall be
released from the Company's Repurchase Option    [one year]    after the Date of
                                              ----------------                  
Grant and __________________ percent (______%) of the Shares [at the end of each
                                                              ------------------
month thereafter], provided that the Purchaser does not cease to be a Service
- ----------------                                                             
Provider prior to the date of any such release.

          (b)  Any of the Shares that have not yet been released from the
Repurchase Option are referred to herein as "Unreleased Shares."

          (c)  The Shares that have been released from the Repurchase Option
shall be delivered to the Purchaser at the Purchaser's request (see Section 6).

     5.   Restriction on Transfer.  Except for the escrow described in Section 6
          -----------------------                                               
or the transfer of the Shares to the Company or its assignees contemplated by
this Agreement, none of the Shares or any beneficial interest therein shall be
transferred, encumbered or otherwise disposed of in any way until such Shares
are released from the Company's Repurchase Option in accordance with the provi
sions of this Agreement, other than by will or the laws of descent and
distribution.

     6.   Escrow of Shares.
          ---------------- 

          (a)  To ensure the availability for delivery of the Purchaser's
Unreleased Shares upon repurchase by the Company pursuant to the Repurchase
Option, the Purchaser shall, upon execution of this Agreement, deliver and
deposit with an escrow holder designated by the Company (the "Escrow Holder")
the share certificates representing the Unreleased Shares, together with the
stock assignment duly endorsed in blank, attached hereto as Exhibit A-2.  The
Unreleased Shares and stock assignment shall be held by the Escrow Holder,
pursuant to the Joint Escrow Instructions of the Company and Purchaser attached
hereto as Exhibit A-3, until such time as the Company's Repurchase Option
expires.

                                      -2-
<PAGE>
 
          (b)  The Escrow Holder shall not be liable for any act it may do or
omit to do with respect to holding the Unreleased Shares in escrow while acting
in good faith and in the exercise of its judgment.

          (c)  If the Company or any assignee exercises the Repurchase Option
hereunder, the Escrow Holder, upon receipt of written notice of such exercise
from the proposed transferee, shall take all steps necessary to accomplish such
transfer.

          (d)  When the Repurchase Option has been exercised or expires
unexercised or a portion of the Shares has been released from the Repurchase
Option, upon request the Escrow Holder shall promptly cause a new certificate to
be issued for the released Shares and shall deliver the certificate to the
Company or the Purchaser, as the case may be.

          (e)  Subject to the terms hereof, the Purchaser shall have all the
rights of a stockholder with respect to the Shares while they are held in
escrow, including without limitation, the right to vote the Shares and to
receive any cash dividends declared thereon.  If, from time to time during the
term of the Repurchase Option, there is (i) any stock dividend, stock split or
other change in the Shares, or (ii) any merger or sale of all or substantially
all of the assets or other acquisition of the Company, any and all new,
substituted or additional securities to which the Purchaser is entitled by
reason of the Purchaser's ownership of the Shares shall be immediately subject
to this escrow, deposited with the Escrow Holder and included thereafter as
"Shares" for purposes of this Agreement and the Repurchase Option.

     7.   Legends.  The share certificate evidencing the Shares, if any,  issued
          -------                                                               
hereunder shall be endorsed with the following legend (in addition to any legend
required under applicable state securities laws):

     THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO CERTAIN
RESTRICTIONS UPON TRANSFER AND RIGHTS OF REPURCHASE AS SET FORTH IN AN AGREEMENT
BETWEEN THE COMPANY AND THE Stockholder, A COPY OF WHICH IS ON FILE WITH THE
SECRETARY OF THE COMPANY.

     8.   Adjustment for Stock Split.  All references to the number of Shares 
          --------------------------   
and the purchase price of the Shares in this Agreement shall be appropriately
adjusted to reflect any stock split, stock dividend or other change in the
Shares which may be made by the Company after the date of this Agreement.

     9.   Tax Consequences.  The Purchaser has reviewed with the Purchaser's own
          ----------------                                                      
tax advisors the federal, state, local and foreign tax consequences of this
investment and the transactions contem  plated by this Agreement.  The Purchaser
is relying solely on such advisors and not on any statements or representations
of the Company or any of its agents.  The Purchaser understands that the
Purchaser (and not the Company) shall be responsible for the Purchaser's own tax
liability that may arise as a result of the transactions contemplated by this
Agreement.  The Purchaser understands that 

                                      -3-
<PAGE>
 
Section 83 of the Internal Revenue Code of 1986, as amended (the "Code"), taxes
as ordinary income the difference between the purchase price for the Shares and
the Fair Market Value of the Shares as of the date any restrictions on the
Shares lapse.  In this context, "restriction" includes the right of the Company
to buy back the Shares pursuant to the Repurchase Option.  The Purchaser
understands that the Purchaser may elect to be taxed at the time the Shares are
purchased rather than when and as the Repurchase Option expires by filing an
election under Section 83(b) of the Code with the IRS within 30 days from the
date of purchase.  The form for making this election is attached as Exhibit A-4
hereto.

          THE PURCHASER ACKNOWLEDGES THAT IT IS THE PURCHASER'S SOLE
RESPONSIBILITY AND NOT THE COMPANY'S TO FILE TIMELY THE ELECTION UNDER SECTION
83(b), EVEN IF THE PURCHASER REQUESTS THE COMPANY OR ITS REPRESENTATIVES TO MAKE
THIS FILING ON THE PURCHASER'S BEHALF.

     10.  General Provisions.
          ------------------ 

          (a)  This Agreement shall be governed by the internal substantive
laws, but not the choice of law rules of California.  This Agreement, subject to
the terms and conditions of the Plan and the Notice of Grant, represents the
entire agreement between the parties with respect to the purchase of the Shares
by the Purchaser.  Subject to Section 16(c) of the Plan, in the event of a
conflict between the terms and conditions of the Plan and the terms and
conditions of this Agreement, the terms and conditions of the Plan shall
prevail.  Unless otherwise defined herein, the terms defined in the Plan shall
have the same defined meanings in this Agreement.

          (b)  Any notice, demand or request required or permitted to be given
by either the Company or the Purchaser pursuant to the terms of this Agreement
shall be in writing and shall be deemed given when delivered personally or
deposited in the U.S. mail, First Class with postage prepaid, and addressed to
the parties at the addresses of the parties set forth at the end of this
Agreement or such other address as a party may request by notifying the other in
writing.

          Any notice to the Escrow Holder shall be sent to the Company's address
with a copy to the other party hereto.

          (c)  The rights of the Company under this Agreement shall be
transferable to any one or more persons or entities, and all covenants and
agreements hereunder shall inure to the benefit of, and be enforceable by the
Company's successors and assigns.  The rights and obligations of the Purchaser
under this Agreement may only be assigned with the prior written consent of the
Company.

          (d)  Either party's failure to enforce any provision of this Agreement
shall not in any way be construed as a waiver of any such provision, nor prevent
that party from thereafter enforcing any other provision of this Agreement.  The
rights granted both parties hereunder are cumulative and shall not constitute a
waiver of either party's right to assert any other legal remedy available to it.

                                      -4-
<PAGE>
 
          (e)  The Purchaser agrees upon request to execute any further
documents or instruments necessary or desirable to carry out the purposes or
intent of this Agreement.

          (f)  PURCHASER ACKNOWLEDGES AND AGREES THAT THE VESTING OF SHARES
PURSUANT TO SECTION 4 HEREOF IS EARNED ONLY BY CONTINUING SERVICE AS A SERVICE
PROVIDER AT THE WILL OF THE COMPANY (AND NOT THROUGH THE ACT OF BEING HIRED OR
PURCHASING SHARES HEREUNDER). PURCHASER FURTHER ACKNOWLEDGES AND AGREES THAT
THIS AGREEMENT, THE TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE
SET FORTH HEREIN DO NOT CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF CONTINUED
ENGAGEMENT AS A SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY PERIOD, OR AT
ALL, AND SHALL NOT INTERFERE WITH PURCHASER'S RIGHT OR THE COMPANY'S RIGHT TO
TERMINATE PURCHASER'S RELATIONSHIP AS A SERVICE PROVIDER AT ANY TIME, WITH OR
WITHOUT CAUSE.

     By Purchaser's signature below, Purchaser represents that he or she is
familiar with the terms and provisions of the Plan, and hereby accepts this
Agreement subject to all of the terms and provisions thereof.  Purchaser has
reviewed the Plan and this Agreement in their entirety, has had an opportunity
to obtain the advice of counsel prior to executing this Agreement and fully
understands all provisions of this Agreement.  Purchaser agrees to accept as
binding, conclusive and final all decisions or interpretations of the
Administrator upon any questions arising under the Plan or this Agreement.
Purchaser further agrees to notify the Company upon any change in the residence
indicated in the Notice of Grant.

DATED:  _____________________

PURCHASER:                             RAMBUS INC.

_____________________________          ___________________________________
Signature                              By

_____________________________          ___________________________________
Print Name                             Title

                                      -5-
<PAGE>
 
                                  EXHIBIT A-2
                                  -----------

                     ASSIGNMENT SEPARATE FROM CERTIFICATE



     FOR VALUE RECEIVED I, __________________________, hereby sell, assign and
transfer unto
________________________________________________________________________________
________________ (__________) shares of the Common Stock of Rambus Inc. standing
in my name of the books of said corporation represented by Certificate No. _____
herewith and do hereby irrevocably constitute and appoint
____________________________________________ to transfer the said stock on the
books of the within named corporation with full power of substitution in the
premises.

     This Stock Assignment may be used only in accordance with the Restricted
Stock Purchase Agreement (the "Agreement") between________________________ and
the undersigned dated ______________, 19__.


Dated: _______________, 19__


                                       Signature:______________________________



INSTRUCTIONS:  Please do not fill in any blanks other than the signature line.
The purpose of this assignment is to enable the Company to exercise the
Repurchase Option, as set forth in the Agreement, without requiring additional
signatures on the part of the Purchaser.
<PAGE>
 
                                  EXHIBIT A-3
                                  -----------

                           JOINT ESCROW INSTRUCTIONS
                           -------------------------


                                                             _____________, 19__


Corporate Secretary
Rambus Inc.
2465 Latham Drive
Mountain View, CA 94040



Dear _________________:

     As Escrow Agent for both Rambus Inc., a Delaware corporation (the
"Company"), and the undersigned purchaser of stock of the Company (the
"Purchaser"), you are hereby authorized and directed to hold the documents
delivered to you pursuant to the terms of that certain Restricted Stock Purchase
Agreement ("Agreement") between the Company and the undersigned, in accordance
with the following instructions:

     1.   In the event the Company and/or any assignee of the Company (referred
to collectively as the "Company") exercises the Company's Repurchase Option set
forth in the Agreement, the Company shall give to Purchaser and you a written
notice specifying the number of shares of stock to be purchased, the purchase
price, and the time for a closing hereunder at the principal office of the
Company.  Purchaser and the Company hereby irrevocably authorize and direct you
to close the transaction contemplated by such notice in accordance with the
terms of said notice.

     2.   At the closing, you are directed (a) to date the stock assignments
necessary for the transfer in question, (b) to fill in the number of shares
being transferred, and (c) to deliver same, together with the certificate
evidencing the shares of stock to be transferred, to the Company or its
assignee, against the simultaneous delivery to you of the purchase price (by
cash, a check, or some combination thereof) for the number of shares of stock
being purchased pursuant to the exercise of the Company's Repurchase Option.

     3.   Purchaser irrevocably authorizes the Company to deposit with you any
certificates evidencing shares of stock to be held by you hereunder and any
additions and substitutions to said shares as defined in the Agreement.
Purchaser does hereby irrevocably constitute and appoint you as Purchaser's
attorney-in-fact and agent for the term of this escrow to execute with respect
to such securities all documents necessary or appropriate to make such
securities negotiable and to complete any transaction herein contemplated,
including but not limited to the filing with any applicable state blue sky
authority of any required applications for consent to, or notice of transfer of,
the securities. Subject to the provisions of this paragraph 3, Purchaser shall
exercise all rights and privileges of a stockholder of the Company while the
stock is held by you.
<PAGE>
 
     4.   Upon written request of the Purchaser, but no more than once per
calendar year, unless the Company's Repurchase Option has been exercised, you
shall deliver to Purchaser a certificate or certificates representing so many
shares of stock as are not then subject to the Company's Repurchase Option.
Within 90 days after Purchaser ceases to be a Service Provider, you shall
deliver to Purchaser a certificate or certificates representing the aggregate
number of shares held or issued pursuant to the Agreement and not purchased by
the Company or its assignees pursuant to exercise of the Company's Repurchase
Option.

     5.   If at the time of termination of this escrow you should have in your
possession any documents, securities, or other property belonging to Purchaser,
you shall deliver all of the same to Purchaser and shall be discharged of all
further obligations hereunder.

     6.   Your duties hereunder may be altered, amended, modified or revoked
only by a writing signed by all of the parties hereto.

     7.   You shall be obligated only for the performance of such duties as are
specifically set forth herein and may rely and shall be protected in relying or
refraining from acting on any instrument reasonably believed by you to be
genuine and to have been signed or presented by the proper party or parties.
You shall not be personally liable for any act you may do or omit to do
hereunder as Escrow Agent or as attorney-in-fact for Purchaser while acting in
good faith, and any act done or omitted by you pursuant to the advice of your
own attorneys shall be conclusive evidence of such good faith.

     8.   You are hereby expressly authorized to disregard any and all warnings
given by any of the parties hereto or by any other person or corporation,
excepting only orders or process of courts of law, and are hereby expressly
authorized to comply with and obey orders, judgments or decrees of any court.
In case you obey or comply with any such order, judgment or decree, you shall
not be liable to any of the parties hereto or to any other person, firm or
corporation by reason of such compliance, notwithstanding any such order,
judgment or decree being subsequently reversed, modified, annulled, set aside,
vacated or found to have been entered without jurisdiction.

     9.   You shall not be liable in any respect on account of the identity,
authorities or rights of the parties executing or delivering or purporting to
execute or deliver the Agreement or any documents or papers deposited or called
for hereunder.

     10.  You shall not be liable for the outlawing of any rights under the
statute of limitations with respect to these Joint Escrow Instructions or any
documents deposited with you.

     11.  You shall be entitled to employ such legal counsel and other experts
as you may deem necessary properly to advise you in connection with your
obligations hereunder, may rely upon the advice of such counsel, and may pay
such counsel reasonable compensation therefor.

                                      -2-
<PAGE>
 
     12.  Your responsibilities as Escrow Agent hereunder shall terminate if you
shall cease to be an officer or agent of the Company or if you shall resign by
written notice to each party.  In the event of any such termination, the Company
shall appoint a successor Escrow Agent.

     13.  If you reasonably require other or further instruments in connection
with these Joint Escrow Instructions or obligations in respect hereto, the
necessary parties hereto shall join in furnishing such instruments.

     14.  It is understood and agreed that should any dispute arise with respect
to the delivery and/or ownership or right of possession of the securities held
by you hereunder, you are authorized and directed to retain in your possession
without liability to anyone all or any part of said securities until such
disputes shall have been settled either by mutual written agreement of the
parties concerned or by a final order, decree or judgment of a court of
competent jurisdiction after the time for appeal has expired and no appeal has
been perfected, but you shall be under no duty whatsoever to institute or defend
any such proceedings.

     15.  Any notice required or permitted hereunder shall be given in writing
and shall be deemed effectively given upon personal delivery or upon deposit in
the United States Post Office, by registered or certified mail with postage and
fees prepaid, addressed to each of the other parties thereunto entitled at the
following addresses or at such other addresses as a party may designate by ten
days' advance written notice to each of the other parties hereto.


          COMPANY:                     Rambus Inc.
                                       2465 Latham Drive
                                       Mountain View, CA 94040

          PURCHASER:                   _______________________________

                                       _______________________________

                                       _______________________________
 
                                       
          ESCROW AGENT:                Corporate Secretary
                                       Rambus Inc.
                                       2465 Latham Drive
                                       Mountain View, CA 94040

     16.  By signing these Joint Escrow Instructions, you become a party hereto
only for the purpose of said Joint Escrow Instructions; you do not become a
party to the Agreement.

                                      -3-
<PAGE>
 
     17.  This instrument shall be binding upon and inure to the benefit of the
parties hereto, and their respective successors and permitted assigns.

     18.  These Joint Escrow Instructions shall be governed by, and construed
and enforced in accordance with, the internal substantive laws, but not the
choice of law rules, of California.

                                  Very truly yours,

                                  RAMBUS INC.


                                  _____________________________________
                                  By

                                  _____________________________________
                                  Title

                                  PURCHASER:

                                  _____________________________________
                                  Signature

                                  _____________________________________
                                  Print Name


ESCROW AGENT:


_____________________________________
Corporate Secretary

                                      -4-
<PAGE>
 
                                  EXHIBIT A-4
                                  -----------
                         ELECTION UNDER SECTION 83(b)
                         ----------------------------
                     OF THE INTERNAL REVENUE CODE OF 1986
                     ------------------------------------

The undersigned taxpayer hereby elects, pursuant to Section 83(b) of the
Internal Revenue Code of 1986, as amended, to include in taxpayer's gross income
for the current taxable year the amount of any compensation taxable to taxpayer
in connection with his or her receipt of the property described below:

1.   The name, address, taxpayer identification number and taxable year of the
     undersigned are as follows:

     NAME:                        TAXPAYER:                SPOUSE:

     ADDRESS:

     IDENTIFICATION NO.:          TAXPAYER:                SPOUSE:

     TAXABLE YEAR:

2.   The property with respect to which the election is made is described as
     follows:  __________ shares (the "Shares") of the Common Stock of Rambus,
     Inc. (the "Company").

3.   The date on which the property was transferred is: ______________, 19__.

4.   The property is subject to the following restrictions:

     The Shares may be repurchased by the Company, or its assignee, upon certain
     events. This right lapses with regard to a portion of the Shares based on
     the continued performance of services by the taxpayer over time.

5.   The fair market value at the time of transfer, determined without regard to
     any restriction other than a restriction which by its terms will never
     lapse, of such property is:
     $_______________.

6.   The amount (if any) paid for such property is:

     $_______________.

The undersigned has submitted a copy of this statement to the person for whom
the services were performed in connection with the undersigned's receipt of the
above-described property.  The transferee of such property is the person
performing the services in connection with the transfer of said property.

The undersigned understands that the foregoing election may not be revoked
- --------------------------------------------------------------------------
except with the consent of the Commissioner.
- ------------------------------------------- 

Dated:  ___________________, 19____    ________________________________________
                                       Taxpayer
 

The undersigned spouse of taxpayer joins in this election.

Dated:  ___________________, 19____    _________________________________________
                                       Spouse of Taxpayer

<PAGE>
 
                                                                     EXHIBIT 4.7

                                  RAMBUS INC.

                       1997 EMPLOYEE STOCK PURCHASE PLAN


     The following constitute the provisions of the 1997 Employee Stock Purchase
Plan of Rambus Inc.

     1.   Purpose.  The purpose of the Plan is to provide employees of the
          -------                                                         
Company and its Designated Subsidiaries with an opportunity to purchase Common
Stock of the Company through accumulated payroll deductions.  It is the
intention of the Company to have the Plan qualify as an "Employee Stock Purchase
Plan" under Section 423 of the Internal Revenue Code of 1986, as amended.  The
provisions of the Plan, accordingly, shall be construed so as to extend and
limit participation in a manner consistent with the requirements of that section
of the Code.

     2.   Definitions.
          ----------- 

          (a)  "Board" shall mean the Board of Directors of the Company.
                -----                                                   

          (b)  "Code" shall mean the Internal Revenue Code of 1986, as amended.
                ----                                                           

          (c)  "Common Stock" shall mean the Common Stock of the Company.
                ------------                                             

          (d)  "Company" shall mean Rambus Inc. and any Designated Subsidiary of
                -------                                                         
the Company.

          (e)  "Compensation" shall mean all base straight time gross earnings,
                ------------                                                   
but exclusive of payments for overtime, shift premium, incentive compensation,
incentive payments, bonuses and other compensation.

          (f)  "Designated Subsidiary" shall mean any Subsidiary which has been
                ---------------------                                          
designated by the Board from time to time in its sole discretion as eligible to
participate in the Plan.

          (g)  "Employee" shall mean any individual who is an Employee of the
                --------                                                     
Company for tax purposes whose customary employment with the Company is at least
twenty (20) hours per week and more than five (5) months in any calendar year.
For purposes of the Plan, the employment relationship shall be treated as
continuing intact while the individual is on sick leave or other leave of
absence approved by the Company.  Where the period of leave exceeds 90 days and
the individual's right to reemployment is not guaranteed either by statute or by
contract, the employment relationship shall be deemed to have terminated on the
91st day of such leave.

          (h)  "Enrollment Date" shall mean the first day of each Offering
                ---------------                                           
Period.

          (i)  "Exercise Date" shall mean the last day of each Purchase Period.
                -------------                                                  
<PAGE>
 
          (j)  "Fair Market Value" shall mean, as of any date, the value of
                -----------------                                          
Common Stock determined as follows:

               (1)  If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the Nasdaq
National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its
Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the last market trading day prior to the time of determination, as reported in
The Wall Street Journal or such other source as the Administrator deems
reliable, or;

               (2)  If the Common Stock is regularly quoted by a recognized
securities dealer but selling prices are not reported, its Fair Market Value
shall be the mean of the closing bid and asked prices for the Common Stock on
the date of such determination, as reported in The Wall Street Journal or such
other source as the Board deems reliable, or;

               (3)  In the absence of an established market for the Common
Stock, the Fair Market Value thereof shall be determined in good faith by the
Board, or;

               (4)  For purposes of the Enrollment Date of the first Offering
Period under the Plan, the Fair Market Value shall be the initial price to the
public as set forth in the final prospectus included within the registration
statement in Form S-1 filed with the Securities and Exchange Commission for the
initial public offering of the Company's Common Stock (the "Registration
Statement").
 
          (k)  "Offering Periods" shall mean the periods of approximately 
                ----------------                                                
twenty-four (24) months during which an option granted pursuant to the Plan may
be exercised, commencing on the first Trading Day on or after May 1 and November
1 of each year and terminating on the last Trading Day in the periods ending
twenty-four months later; provided, however, that the first Offering Period
under the Plan shall commence with the first Trading Day on or after the date on
which the Securities and Exchange Commission declares the Company's Registration
Statement effective and ending on the last Trading Day on or after April 30,
1999.  The duration and timing of Offering Periods may be changed pursuant to
Section 4 of this Plan.

          (l)  "Plan" shall mean this Employee Stock Purchase Plan.
                ----                                               

          (m)  "Purchase Price" shall mean an amount equal to 85% of the Fair
                --------------                                               
Market Value of a share of Common Stock on the Enrollment Date or on the
Exercise Date, whichever is lower.

          (n)  "Purchase Period" shall mean the approximately six month period
                ---------------                                               
commencing after one Exercise Date and ending with the next Exercise Date,
except that the first Purchase Period of any Offering Period shall commence on
the Enrollment Date and end with the next Exercise Date.

                                      -2-
<PAGE>
 
          (o)  "Reserves" shall mean the number of shares of Common Stock 
                --------  
covered by each option under the Plan which have not yet been exercised and the
number of shares of Common Stock which have been authorized for issuance under
the Plan but not yet placed under option.

          (p)  "Subsidiary" shall mean a corporation, domestic or foreign, of
                ----------                                                   
which not less than 50% of the voting shares are held by the Company or a
Subsidiary, whether or not such corporation now exists or is hereafter organized
or acquired by the Company or a Subsidiary.

          (q)  "Trading Day" shall mean a day on which national stock exchanges
                -----------                                                    
and the Nasdaq System are open for trading.

     3.   Eligibility.
          ----------- 

          (a)  Any Employee who shall be employed by the Company on a given
Enrollment Date shall be eligible to participate in the Plan.

          (b)  Any provisions of the Plan to the contrary notwithstanding, no
Employee shall be granted an option under the Plan (i) to the extent that,
immediately after the grant, such Employee (or any other person whose stock
would be attributed to such Employee pursuant to Section 424(d) of the Code)
would own capital stock of the Company and/or hold outstanding options to
purchase such stock possessing five percent (5%) or more of the total combined
voting power or value of all classes of the capital stock of the Company or of
any Subsidiary, or (ii) to the extent that his or her rights to purchase stock
under all employee stock purchase plans of the Company and its subsidiaries
accrues at a rate which exceeds Twenty-Five Thousand Dollars ($25,000) worth of
stock (determined at the fair market value of the shares at the time such option
is granted) for each calendar year in which such option is outstanding at any
time.

     4.   Offering Periods.  The Plan shall be implemented by consecutive,
          ----------------                                                
overlapping Offering Periods with a new Offering Period commencing on the first
Trading Day on or after May 1 and November 1 each year, or on such other date as
the Board shall determine, and continuing thereafter until terminated in
accordance with Section 20 hereof; provided, however, that the first Offering
Period under the Plan shall commence with the first Trading Day on or after the
date on which the Securities and Exchange Commission declares the Company's
Registration Statement effective and ending on the last Trading Day on or after
April 30, 1999.   The Board shall have the power to change the duration of
Offering Periods (including the commencement dates thereof) with respect to
future offerings without shareholder approval if such change is announced at
least five (5) days prior to the scheduled beginning of the first Offering
Period to be affected thereafter.

     5.   Participation.
          ------------- 

          (a)  An eligible Employee may become a participant in the Plan by
completing a subscription agreement authorizing payroll deductions in the form
of Exhibit A to this Plan and filing it with the Company's payroll office prior
to the applicable Enrollment Date.

                                      -3-
<PAGE>
 
          (b)  Payroll deductions for a participant shall commence on the first
payroll following the Enrollment Date and shall end on the last payroll in the
Offering Period to which such authorization is applicable, unless sooner
terminated by the participant as provided in Section 10 hereof.

     6.   Payroll Deductions.
          ------------------ 

          (a)  At the time a participant files his or her subscription
agreement, he or she shall elect to have payroll deductions made on each pay day
during the Offering Period in an amount not exceeding fifteen (15%) of the
Compensation which he or she receives on each pay day during the Offering
Period.
          (b)  All payroll deductions made for a participant shall be credited
to his or her account under the Plan and shall be withheld in whole percentages
only.  A participant may not make any additional payments into such account.

          (c)  A participant may discontinue his or her participation in the
Plan as provided in Section 10 hereof, or may increase or decrease the rate of
his or her payroll deductions during the Offering Period by completing or filing
with the Company a new subscription agreement authorizing a change in payroll
deduction rate.  The Board may, in its discretion, limit the number of
participation rate changes during any Offering Period.  The change in rate shall
be effective with the first full payroll period following five (5) business days
after the Company's receipt of the new subscription agreement unless the Company
elects to process a given change in participation more quickly.  A participant's
subscription agreement shall remain in effect for successive Offering Periods
unless terminated as provided in Section 10 hereof.

          (d)  Notwithstanding the foregoing, to the extent necessary to comply
with Section 423(b)(8) of the Code and Section 3(b) hereof, a participant's
payroll deductions may be decreased to zero percent (0%) at any time during a
Purchase Period.  Payroll deductions shall recommence at the rate provided in
such participant's subscription agreement at the beginning of the first Purchase
Period which is scheduled to end in the following calendar year, unless
terminated by the participant as provided in Section 10 hereof.

          (e)  At the time the option is exercised, in whole or in part, or at
the time some or all of the Company's Common Stock issued under the Plan is
disposed of, the participant must make adequate provision for the Company's
federal, state, or other tax withholding obligations, if any, which arise upon
the exercise of the option or the disposition of the Common Stock.  At any time,
the Company may, but shall not be obligated to, withhold from the participant's
compensation the amount necessary for the Company to meet applicable withholding
obligations, including any withholding required to make available to the Company
any tax deductions or benefits attributable to sale or early disposition of
Common Stock by the Employee.

                                      -4-
<PAGE>
 
     7.   Grant of Option.  On the Enrollment Date of each Offering Period, each
          ---------------                                                       
eligible Employee participating in such Offering Period shall be granted an
option to purchase on each Exercise Date during such Offering Period (at the
applicable Purchase Price) up to a number of shares of the Company's Common
Stock determined by dividing such Employee's payroll deductions accumulated
prior to such Exercise Date and retained in the Participant's account as of the
Exercise Date by the applicable Purchase Price; provided that such purchase
shall be subject to the limitations set forth in Sections 3(b) and 12 hereof.
Exercise of the option shall occur as provided in Section 8 hereof, unless the
participant has withdrawn pursuant to Section 10 hereof.  The option shall
expire on the last day of the Offering Period.

     8.   Exercise of Option.  Unless a participant withdraws from the Plan as
          ------------------                                                  
provided in Section 10 hereof, his or her option for the purchase of shares
shall be exercised automatically on the Exercise Date, and the maximum number of
full shares subject to option shall be purchased for such participant at the
applicable Purchase Price with the accumulated payroll deductions in his or her
account.  No fractional shares shall be purchased; any payroll deductions
accumulated in a participant's account which are not sufficient to purchase a
full share shall be retained in the participant's account for the subsequent
Purchase Period or Offering Period, subject to earlier with  drawal by the
participant as provided in Section 10 hereof.  Any other monies left over in a
participant's account after the Exercise Date shall be returned to the
participant.  During a participant's lifetime, a participant's option to
purchase shares hereunder is exercisable only by him or her.

     9.   Delivery.  As promptly as practicable after each Exercise Date on
          --------                                                         
which a purchase of shares occurs, the Company shall arrange the delivery to
each participant, as appropriate, of a certificate representing the shares
purchased upon exercise of his or her option.

     10.  Withdrawal.
          ---------- 

          (a)  A participant may withdraw all but not less than all the payroll
deductions credited to his or her account and not yet used to exercise his or
her option under the Plan at any time by giving written notice to the Company in
the form of Exhibit B to this Plan.  All of the participant's payroll deductions
credited to his or her account shall be paid to such participant promptly after
receipt of notice of withdrawal and such participant's option for the Offering
Period shall be automatically terminated, and no further payroll deductions for
the purchase of shares shall be made for such Offering Period.  If a participant
withdraws from an Offering Period, payroll deductions shall not resume at the
beginning of the succeeding Offering Period unless the participant delivers to
the Company a new subscription agreement.

          (b)  A participant's withdrawal from an Offering Period shall not have
any effect upon his or her eligibility to participate in any similar plan which
may hereafter be adopted by the Company or in succeeding Offering Periods which
commence after the termination of the Offering Period from which the participant
withdraws.

                                      -5-
<PAGE>
 
     11.  Termination of Employment.
          ------------------------- 

          Upon a participant's ceasing to be an Employee, for any reason, he or
she shall be deemed to have elected to withdraw from the Plan and the payroll
deductions credited to such participant's account during the Offering Period but
not yet used to exercise the option shall be returned to such participant or, in
the case of his or her death, to the person or persons entitled thereto under
Section 15 hereof, and such participant's option shall be automatically
terminated.  The preceding sentence notwithstanding, a participant who receives
payment in lieu of notice of termination of employment shall be treated as
continuing to be an Employee for the participant's customary number of hours per
week of employment during the period in which the participant is subject to such
payment in lieu of notice.

     12.  Interest.  No interest shall accrue on the payroll deductions of a
          --------                                                          
participant in the Plan.

     13.  Stock.
          ----- 

          (a)  Subject to Section 19, the maximum number of shares of the
Company's Common Stock which shall be made available for sale under the Plan
shall be 400,000 shares, plus an annual increase as of the last day of each of
the Company's immediately preceding fiscal years during the term of Plan equal
to the lesser of (i) the number of Shares needed to restore the maximum
aggregate number of Shares  which may be optioned and sold under the Plan to
400,000 Shares, (ii) one percent (1%) of the outstanding Shares on such date, or
(iii) a lesser amount determined by the Board.  If, on a given Exercise Date,
the number of shares with respect to which options are to be exercised exceeds
the number of shares then available under the Plan, the Company shall make a pro
rata allocation of the shares remaining available for purchase in as uniform a
manner as shall be practicable and as it shall determine to be equitable.

          (b)  The participant shall have no interest or voting right in shares
covered by his option until such option has been exercised.

          (c)  Shares to be delivered to a participant under the Plan shall be
registered in the name of the participant or in the name of the participant and
his or her spouse.

     14.  Administration.  The Plan shall be administered by the Board or a
          --------------                                                   
committee of members of the Board appointed by the Board.  The Board or its
committee shall have full and exclu  sive discretionary authority to construe,
interpret and apply the terms of the Plan, to determine eligibility and to
adjudicate all disputed claims filed under the Plan.  Every finding, decision
and determination made by the Board or its committee shall, to the full extent
permitted by law, be final and binding upon all parties.

                                      -6-
<PAGE>
 
     15.  Designation of Beneficiary.
          -------------------------- 

          (a)  A participant may file a written designation of a beneficiary who
is to receive any shares and cash, if any, from the participant's account under
the Plan in the event of such partici  pant's death subsequent to an Exercise
Date on which the option is exercised but prior to delivery to such participant
of such shares and cash.  In addition, a participant may file a written
designation of a beneficiary who is to receive any cash from the participant's
account under the Plan in the event of such participant's death prior to
exercise of the option.  If a participant is married and the designated
beneficiary is not the spouse, spousal consent shall be required for such
designation to be effective.

          (b)  Such designation of beneficiary may be changed by the participant
at any time by written notice.  In the event of the death of a participant and
in the absence of a beneficiary validly designated under the Plan who is living
at the time of such participant's death, the Company shall deliver such shares
and/or cash to the executor or administrator of the estate of the participant,
or if no such executor or administrator has been appointed (to the knowledge of
the Company), the Company, in its discretion, may deliver such shares and/or
cash to the spouse or to any one or more dependents or relatives of the
participant, or if no spouse, dependent or relative is known to the Company,
then to such other person as the Company may designate.

     16.  Transferability.  Neither payroll deductions credited to a
          ---------------                                           
participant's account nor any rights with regard to the exercise of an option or
to receive shares under the Plan may be assigned, transferred, pledged or
otherwise disposed of in any way (other than by will, the laws of descent and
distribution or as provided in Section 15 hereof) by the participant.  Any such
attempt at assignment, transfer, pledge or other disposition shall be without
effect, except that the Company may treat such act as an election to withdraw
funds from an Offering Period in accordance with Section 10 hereof.

     17.  Use of Funds.  All payroll deductions received or held by the Company
          ------------                                                         
under the Plan may be used by the Company for any corporate purpose, and the
Company shall not be obligated to segregate such payroll deductions.

     18.  Reports.  Individual accounts shall be maintained for each participant
          -------                                                               
in the Plan. Statements of account shall be given to participating Employees at
least annually, which statements shall set forth the amounts of payroll
deductions, the Purchase Price, the number of shares purchased and the remaining
cash balance, if any.

     19.  Adjustments Upon Changes in Capitalization, Dissolution, Liquidation,
          ---------------------------------------------------------------------
     Merger or Asset Sale.
     -------------------- 

          (a)  Changes in Capitalization.  Subject to any required action by the
               -------------------------                                        
shareholders of the Company, the Reserves, the maximum number of shares each
participant may purchase each Purchase Period (pursuant to Section 7), as well
as the price per share and the number of shares of Common Stock covered by each
option under the Plan which has not yet been exercised shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common

                                      -7-
<PAGE>
 
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of shares of Common Stock effected without receipt of
consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration".  Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an option.

          (b)  Dissolution or Liquidation.  In the event of the proposed
               --------------------------                               
dissolution or liquidation of the Company, the Offering Periods shall terminate
immediately prior to the consummation of such proposed action, unless otherwise
provided by the Board.

          (c)  Merger or Asset Sale.  In the event of a proposed sale of all or
               --------------------                                            
substantially all of the assets of the Company, or the merger of the Company
with or into another corporation, any Purchase Periods then in progress shall be
shortened by setting a new Exercise Date (the "New Exercise Date") and any
Offering Periods then in progress shall end on the New Exercise Date.  The New
Exercise Date shall be before the date of the Company's proposed sale or merger.
The Board shall notify each participant in writing, at least ten (10) business
days prior to the New Exercise Date, that the Exercise Date for the
participant's option has been changed to the New Exercise Date and that the
participant's option shall be exercised automatically on the New Exercise Date,
unless prior to such date the participant has withdrawn from the Offering Period
as provided in Section 10 hereof.

     20.  Amendment or Termination.
          ------------------------ 

          (a)  The Board of Directors of the Company may at any time and for any
reason terminate or amend the Plan.  Except as provided in Section 19 hereof, no
such termination can affect options previously granted, provided that an
Offering Period may be terminated by the Board of Directors on any Exercise Date
if the Board determines that the termination of the Plan is in the best
interests of the Company and its shareholders.  Except as provided in Section 19
hereof, no amendment may make any change in any option theretofore granted which
adversely affects the rights of any participant.  To the extent necessary to
comply with Section 423 of the Code (or any successor rule or provision or any
other applicable law, regulation or stock exchange rule), the Company shall
obtain shareholder approval in such a manner and to such a degree as required.

          (b)  Without shareholder consent and without regard to whether any
participant rights may be considered to have been "adversely affected," the
Board (or its committee) shall be entitled to change the Offering Periods, limit
the frequency and/or number of changes in the amount withheld during an Offering
Period, establish the exchange ratio applicable to amounts withheld in a
currency other than U.S. dollars, permit payroll withholding in excess of the
amount designated by a participant in order to adjust for delays or mistakes in
the Company's processing of properly completed withholding elections, establish
reasonable waiting and adjustment periods and/or 

                                      -8-
<PAGE>
 
accounting and crediting procedures to ensure that amounts applied toward the
purchase of Common Stock for each participant properly correspond with amounts
withheld from the participant's Compensation, and establish such other
limitations or procedures as the Board (or its committee) determines in its sole
discretion advisable which are consistent with the Plan.

     21.  Notices.  All notices or other communications by a participant to the
          -------                                                              
Company under or in connection with the Plan shall be deemed to have been duly
given when received in the form specified by the Company at the location, or by
the person, designated by the Company for the receipt thereof.

     22.  Conditions Upon Issuance of Shares.  Shares shall not be issued with
          ----------------------------------                                  
respect to an option unless the exercise of such option and the issuance and
delivery of such shares pursuant thereto shall comply with all applicable
provisions of law, domestic or foreign, including, without limitation, the
Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as
amended, the rules and regulations promulgated thereunder, and the requirements
of any stock exchange upon which the shares may then be listed, and shall be
further subject to the approval of counsel for the Company with respect to such
compliance.

          As a condition to the exercise of an option, the Company may require
the person exercising such option to represent and warrant at the time of any
such exercise that the shares are being purchased only for investment and
without any present intention to sell or distribute such shares if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned applicable provisions of law.

     23.  Term of Plan.  The Plan shall become effective upon the earlier to
          ------------                                                      
occur of its adoption by the Board of Directors or its approval by the
shareholders of the Company.  It shall continue in effect for a term of ten (10)
years unless sooner terminated under Section 20 hereof.

     24.  Automatic Transfer to Low Price Offering Period.  To the extent
          -----------------------------------------------                
permitted by any applicable laws, regulations, or stock exchange rules if the
Fair Market Value of the Common Stock on any Exercise Date in an Offering Period
is equal to or lower than the Fair Market Value of the Common Stock on the
Enrollment Date of such Offering Period, then all participants in such Offering
Period shall be automatically withdrawn from such Offering Period immediately
after the exercise of their option on such Exercise Date and automatically re-
enrolled in the immediately following Offering Period as of the first day
thereof.

                                      -9-
<PAGE>
 
                                   EXHIBIT A
                                   ---------


                                  RAMBUS INC.

                       1997 EMPLOYEE STOCK PURCHASE PLAN

                            SUBSCRIPTION AGREEMENT



_____ Original Application                          Enrollment Date: ___________
_____ Change in Payroll Deduction Rate
_____ Change of Beneficiary(ies)


1.   _____________________________________________________ hereby elects to
     participate in the Rambus Inc. 1997 Employee Stock Purchase Plan (the
     "Employee Stock Purchase Plan") and subscribes to pur  chase shares of the
     Company's Common Stock in accordance with this Subscription Agreement and
     the Employee Stock Purchase Plan.

2.   I hereby authorize payroll deductions from each paycheck in the amount of
     ____% of my Compensation on each payday (from 1 to 15%) during the Offering
     Period in accordance with the Employee Stock Purchase Plan.  (Please note
     that no fractional percentages are permitted.)

3.   I understand that said payroll deductions shall be accumulated for the
     purchase of shares of Common Stock at the applicable Purchase Price
     determined in accordance with the Employee Stock Purchase Plan.  I
     understand that if I do not withdraw from an Offering Period, any
     accumulated payroll deductions will be used to automatically exercise my
     option.

4.   I have received a copy of the complete Employee Stock Purchase Plan.  I
     understand that my participation in the Employee Stock Purchase Plan is in
     all respects subject to the terms of the Plan.  I understand that my
     ability to exercise the option under this Subscription Agreement is subject
     to shareholder approval of the Employee Stock Purchase Plan.

5.   Shares purchased for me under the Employee Stock Purchase Plan should be
     issued in the name(s) of (Employee or Employee and Spouse only):
     ___________________________________________________________________________
     ___________.

6.   I understand that if I dispose of any shares received by me pursuant to the
     Plan within 2 years after the Enrollment Date (the first day of the
     Offering Period during which I purchased such shares) or one year after the
     Exercise Date, I will be treated for federal income tax purposes as having
     received ordinary income at the time of such disposition in an amount equal
     to the excess of the fair market value of the shares at the time such
     shares were purchased by me over the price which I paid for the shares.  I
                                                                              -
     hereby agree to notify the Company in writing 
     ---------------------------------------------
<PAGE>
 
     within 30 days after the date of any disposition of my shares and I will 
     ------------------------------------------------------------------------
     make adequate provision for Federal, state or other tax withholding 
     -------------------------------------------------------------------
     obligations, if any, which arise upon the disposition of the Common Stock.
     -------------------------------------------------------------------------
     The Company may, but will not be obligated to, withhold from my
     compensation the amount necessary to meet any applicable withholding
     obligation including any withholding necessary to make available to the
     Company any tax deductions or benefits attributable to sale or early
     disposition of Common Stock by me.  If I dispose of such shares at any time
     after the expiration of the 2-year and 1-year holding periods, I understand
     that I will be treated for federal income tax purposes as having received
     income only at the time of such disposition, and that such income will be
     taxed as ordinary income only to the extent of an amount equal to the
     lesser of (1) the excess of the fair market value of the shares at the time
     of such disposition over the purchase price which I paid for the shares, or
     (2) 15% of the fair market value of the shares on the first day of the
     Offering Period.  The remainder of the gain, if any, recognized on such
     disposition will be taxed as capital gain.

7.   I hereby agree to be bound by the terms of the Employee Stock Purchase
     Plan.  The effectiveness of this Subscription Agreement is dependent upon
     my eligibility to participate in the Employee Stock Purchase Plan.

8.   In the event of my death, I hereby designate the following as my
     beneficiary(ies) to receive all payments and shares due me under the
     Employee Stock Purchase Plan:


NAME:  (Please print)______________________________________________
                      (First)         (Middle)               (Last)


_____________________________          ________________________________________
Relationship

                                       ________________________________________
                                       (Address)

                                      -2-
<PAGE>
 
Employee's Social
Security Number:                       ____________________________________



Employee's Address:                    ____________________________________

                                       ____________________________________

                                       ____________________________________

I UNDERSTAND THAT THIS SUBSCRIPTION AGREEMENT SHALL REMAIN IN EFFECT THROUGHOUT
SUCCESSIVE OFFERING PERIODS UNLESS TERMINATED BY ME.



Dated:_________________________        ________________________________________
                                       Signature of Employee


                                       ________________________________________
                                       Spouse's Signature (If beneficiary other 
                                        than spouse)

                                      -3-
<PAGE>
 
                                   EXHIBIT B
                                   ---------


                                  RAMBUS INC.

                       1997 EMPLOYEE STOCK PURCHASE PLAN

                             NOTICE OF WITHDRAWAL



     The undersigned participant in the Offering Period of the Rambus Inc. 1997
Employee Stock Purchase Plan which began on ____________, 1997 (the "Enrollment
Date") hereby notifies the Company that he or she hereby withdraws from the
Offering Period.  He or she hereby directs the Company to pay to the undersigned
as promptly as practicable all the payroll deductions credited to his or her
account with respect to such Offering Period. The undersigned understands and
agrees that his or her option for such Offering Period will be automatically
terminated.  The undersigned under  stands further that no further payroll
deductions will be made for the purchase of shares in the current Offering
Period and the undersigned shall be eligible to participate in succeeding
Offering Periods only by delivering to the Company a new Subscription Agreement.

                                       Name and Address of Participant:

                                       ________________________________

                                       ________________________________

                                       ________________________________


                                       Signature:


                                       ________________________________


                                       Date:__________________________

<PAGE>

                                                                     EXHIBIT 5.1

 
                                 June 5, 1997

Rambus Inc.
2465 Latham Street
Mountain View, California  94040

     RE:  REGISTRATION STATEMENT ON FORM S-8

Ladies and Gentlemen:

     We have examined the Registration Statement on Form S-8 (the "Registration
Statement") to be filed by Rambus Inc., a Delaware corporation (the "Registrant"
or "you"), with the Securities and Exchange Commission on or about June 6,
1997, in connection with the registration under the Securities Act of 1933, as
amended, of an aggregate of 3,412,340 shares of your Common Stock, $.001 par
value (the "Shares"), outstanding or reserved for issuance pursuant to the 1990
Stock Plan, 1997 Stock Plan and 1997 Employee Stock Purchase Plan (the "Plans").
As your legal counsel, we have reviewed the actions proposed to be taken by you
in connection with the proposed sale and issuance of the Shares by the
Registrant under the Plans. We assume that the consideration received by you in
connection with each issuance of Shares will include an amount in the form of
cash, services rendered or property that exceeds the greater of (i) the
aggregate par value of such Shares or (ii) the portion of such consideration
determined by the Company's Board of Directors to be "capital" for purposes of
the Delaware General Corporation Law.

     It is our opinion that, upon completion of the proceedings being taken, or
contemplated by us, as your counsel, to be taken prior to the issuance of the
Shares pursuant to the Registration Statement and the Plans, including the
proceedings being taken in order to permit such transaction to be carried out in
accordance with applicable state securities laws, the Shares, when issued and
sold in the manner described in the Registration Statement and in accordance
with the resolutions adopted by the Board of Directors of the Company, will be
legally and validly issued, fully paid and nonassessable.

     We consent to the use of this opinion as an exhibit to the Registration
Statement, and further consent to the use of our name wherever appearing in the
Registration Statement and any amendments thereto.

                              Very truly yours,
                              
                              /s/ WILSON SONSINI GOODRICH & ROSATI
                              --------------------------------------
                              WILSON SONSINI GOODRICH & ROSATI
                              Professional Corporation

<PAGE>
 
                                                                    EXHIBIT 23.1

                      CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the incorporation by reference in the registration statement of 
Rambus Inc. and Subsidiaries on Form S-8 of our report dated November 1, 1996, 
except for Note 17 for which the date is March 31, 1997, on our audits of the 
consolidated financial statements and financial statement schedule of Rambus 
Inc. and Subsidiaries as of September 30, 1996 and 1995, and for the years ended
September 30, 1996, 1995 and 1994, appearing in the Form S-1 Registration 
Statement (Amendment No. 6) of Rambus Inc. (Registration No. 333-22885) filed 
with the Securities and Exchange Commission pursuant to the Securities Act of 
1933.

                                      /s/ COOPERS & LYBRAND L.L.P.
                                      -------------------------------
                                      Coopers & Lybrand L.L.P.

San Jose, California
June 4, 1997


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