INTEGRATED SILICON SOLUTION INC
S-8, 1998-04-22
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>   1
     As filed with the Securities and Exchange Commission on April 22, 1998
                                                 Registration No. 333-__________
================================================================================


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ----------------------

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      under
                           THE SECURITIES ACT OF 1933
                             ----------------------


                        INTEGRATED SILICON SOLUTION, INC.
               (Exact name of issuer as specified in its charter)


           Delaware                                    77-0199971
- ------------------------------           ---------------------------------------
   (State of Incorporation)                 (IRS Employer Identification No.)

                                2231 Lawson Lane
                              Santa Clara, CA 95054
                    (Address of Principal Executive Offices)
                             ----------------------

                                 1989 STOCK PLAN
                        1993 EMPLOYEE STOCK PURCHASE PLAN
                             NONSTATUTORY STOCK PLAN
                            (Full title of the plans)
                             ----------------------

                                 Gary L. Fischer
                           Executive Vice President &
                             Chief Financial Officer
                        INTEGRATED SILICON SOLUTION, INC.
                                2231 Lawson Lane
                              Santa Clara, CA 95054
                     (Name and address of agent for service)
                                 (408) 588-0800
          (Telephone number, including area code, of agent for service)
                             ----------------------

                                    Copy to:
                              J. Robert Suffoletta
                     WILSON SONSINI GOODRICH & ROSATI, P.C.
                               650 Page Mill Road
                           Palo Alto, California 94304
                            Telephone: (650) 493-9300

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
=====================================================================================================================
                                     AMOUNT       PROPOSED MAXIMUM
  TITLE OF SECURITIES TO             TO BE         OFFERING PRICE        PROPOSED MAXIMUM            AMOUNT OF
       BE REGISTERED               REGISTERED        PER SHARE(1)     AGGREGATE OFFERING PRICE    REGISTRATION FEE
=====================================================================================================================
<S>                                <C>               <C>                   <C>                      <C>
Common Stock to be issued
   under the 1989 Stock Plan          500,000          $9.375              $ 4,687,500                $1,382.81
Common Stock to be issued under
   the 1993 Employee Stock
   Purchase Plan                    1,000,000           7.969                7,969,000                 2,350.86
Common Stock to be issued under  
   the Nonstatutory Stock Plan      1,000,000           9.375                9,375,000                 2,765.63
                                                                           -----------                ---------
                                                                           $22,031,500                $6,499.30
</TABLE>

- ----------

(1)     Estimated in accordance with Rule 457(h) solely for the purpose of
        calculating the registration fee on the basis of $9.375, the average of
        the high and low prices per share of the Common Stock as reported on the
        Nasdaq National Market on April 21, 1998 ("Market Price"). The price per
        share for the Employee Stock Purchase Plan was 85% of the Market Price.


<PAGE>   2
                        INTEGRATED SILICON SOLUTION, INC.
                       REGISTRATION STATEMENT ON FORM S-8

                                     PART II

                 INFORMATION REQUIRED IN 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:

      1.    The Company's Annual Report on Form 10-K/A for the year ending
September 30, 1997, filed pursuant to Section 13 of the Securities Exchange Act
of 1934, as amended (the "Exchange Act").

      2.    The Company's Quarterly Report on Form 10-Q/A for the quarter ending
December 31, 1997, filed pursuant to Section 13 of the Exchange Act.

      3.    The Company's Current Report on Form 8-K dated April 10, 1998, filed
pursuant to Section 12 of the Exchange Act.

      4.    The description of the Company's Common Stock contained in the
Company's Registration Statement on Form 8-A dated January 7, 1995, filed
pursuant to Section 12 of the Exchange Act, including any amendment or report
filed for the purpose of updating such description.

      All documents filed by the Company pursuant to Sections 13(a), 13(c), 14
and 15(d) of the Exchange Act on or after the date of this Registration
Statement and prior to the filing of a post-effective amendment which indicates
that all securities offered have been sold or which deregisters all securities
then remaining unsold shall be deemed to be incorporated by reference in this
Registration Statement 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.

      Counsel for the Company, Wilson Sonsini Goodrich & Rosati, P.C., 650 Page
Mill Road, Palo Alto, California 94304, has rendered an opinion as to the Common
Stock offered hereby. As of April 29, 1998, Jeffrey D. Saper, a member of
Wilson, Sonsini, Goodrich & Rosati beneficially owned 20,459 shares of the
Company's Common Stock.


                                      II-1
<PAGE>   3
ITEM 6. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

      The Company's Certificate of Incorporation limits the liability of
directors to the maximum extent permitted by Delaware law. Delaware law provides
that directors of a company will not be personally liable 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 company or its stockholders, (ii) for
acts or omissions not in good faith or which involve intentional misconduct or
knowing violation of law, (iii) for unlawful payments or dividends or unlawful
stock repurchases or redemptions as provided Section 174 of Delaware General
Corporation Law or (iv) for transactions from which the director derived an
improper personal benefit.

      The Company's Bylaws provide that the Company shall indemnify its officers
and directors and may indemnify its employees and other agents to the fullest
extent provided by Delaware law, including those circumstances where
indemnification would otherwise be discretionary under Delaware law. The Company
believes that indemnification under its Bylaws covers at least negligence on the
part of indemnified parties. The Bylaws authorize the use of indemnification
agreements and the Company has entered into such agreements with each of its
directors and officers.

      The Company carries officer and director liability insurance with respect
to certain matters, including matters arising under the Securities Act of 1933,
as amended (the "Securities Act").

      Delaware law does not permit a corporation to eliminate a director's duty
of care, and the provisions of the Company's Certificate of Incorporation have
no effect on the availability of equitable remedies such as injunction or
rescission, based upon a director's breach of the duty of care. Insofar as
indemnification for liabilities arising under the Securities Act may be
permitted to foregoing provisions and agreements, the Company has been informed
that in the opinion of the staff of the Commission such indemnification is
against public policy as expressed in the Securities Act and is therefore
unenforceable.

ITEM 7. EXEMPTION FROM REGISTRATION CLAIMED.

      Not Applicable.

ITEM 8. EXHIBITS.


<TABLE>
<CAPTION>
EXHIBIT
NUMBER                                DESCRIPTION
- -------    ----------------------------------------------------------------
<S>        <C>                        
   4.1     1989 Stock Plan, as amended
   4.2     1993 Employee Stock Purchase Plan, as amended
   4.3     Nonstatutory Stock Plan, as amended
   5.1     Opinion of counsel as to legality of securities being registered
  23.1     Consent of independent auditors 
  23.2     Consent of counsel (contained in Exhibit 5.1) 
  24.1     Power of Attorney (see page II-4)
</TABLE>


                                      II-2
<PAGE>   4
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 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.

            (2)   That, for the purpose of determining any liability under the
Securities Act of 1933, as amended (the "Securities Act") 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, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) 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 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
Securities 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 and will be governed by the final adjudication of such issue.


                                      II-3
<PAGE>   5
                                   SIGNATURES

      Pursuant to the requirements of the Securities Act, 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 Santa Clara, State of California, on April 22, 1998.

                                       INTEGRATED SILICON SOLUTION, INC.

                                       By:  /s/ JIMMY S.M. LEE
                                            ------------------------------------
                                            Jimmy S.M. Lee, President and Chief
                                              Executive Officer

                                POWER OF ATTORNEY

      KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Jimmy S.M. Lee and Gary L. Fischer,
jointly and severally, his or her attorneys-in-fact, each with the power of
substitution, for him or her in any and all capacities, to sign any amendments
to this Registration Statement on Form S-8 and to file the same, with exhibits
thereto and other documents in connection therewith, with the Securities and
Exchange Commission, hereby ratifying and confirming all that each of said
attorneys-in-fact, or his substitution or substitutes, may do or cause to be
done by virtue hereof.

      Pursuant to the requirements of the Securities Act, this Registration
Statement has been signed on April 22, 1998 by the following persons in the
capacities indicated.



              SIGNATURE                                 TITLE
- -----------------------------------    -----------------------------------------

/s/ JIMMY S.M. LEE                     Director, President and Chief Executive 
- -----------------------------------    Officer (Principal Executive Officer)
Jimmy S.M. Lee                         

/s/ GARY L. FISCHER                    Executive Vice President and Chief 
- -----------------------------------    Financial Officer (Principal Financial 
Gary L. Fischer                        and Principal Accounting Officer)

/s/ KONG-YEU HAN                       Director
- -----------------------------------    
Kong-Yeu Han                           

/s/ CHUN WIN WONG                      Director
- -----------------------------------    
Chun Win Wong                          

/s/ LIP-BU TAN                         Director
- -----------------------------------    
Lip-Bu Tan                             

/s/ DIOSDADO P. BANATAO                Director
- -----------------------------------    
Diosdado Banatao                       

/s/ PAULINE ALKER                      Director
- -----------------------------------    
Pauline Alker                          

/s/ HIDE L. TANIGAMI                   Director
- -----------------------------------    
Hide L. Tanigami                       


                                      II-4
<PAGE>   6
                                INDEX TO EXHIBITS


<TABLE>
<CAPTION>
EXHIBIT
NUMBER                                DESCRIPTION
- -------    ----------------------------------------------------------------
<S>        <C>                        
   4.1     1989 Stock Plan, as amended
   4.2     1993 Employee Stock Purchase Plan, as amended
   4.3     Nonstatutory Stock Plan, as amended
   5.1     Opinion of counsel as to legality of securities being registered
  23.1     Consent of independent auditors 
  23.2     Consent of counsel (contained in Exhibit 5.1) 
  24.1     Power of Attorney (see page II-4)
</TABLE>



<PAGE>   1
                                                                     EXHIBIT 4.1


                        INTEGRATED SILICON SOLUTION, INC.

                                 1989 STOCK PLAN
                      (AS AMENDED THROUGH OCTOBER 21, 1997)


      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 422 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 422 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 Integrated Silicon Solution, Inc., a Delaware
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 or Consultant" means the
absence of any interruption or termination of service as an Employee or
Consultant. Continuous Status as an Employee or Consultant shall not be
considered interrupted in the case of: (i) sick leave; (ii) military leave;
(iii) any other leave of absence approved by the Company, 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 time;
or (iv) in the case of transfers between locations of the Company or between the
Company, its Subsidiaries or its successor.


<PAGE>   2
            (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), for the day 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 422 of the Code.

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

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

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

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

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

            (r)   "Plan" means this 1989 Stock Plan.

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

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


                                       2
<PAGE>   3
            (u)   "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 13
of the Plan, the maximum aggregate number of shares which may be optioned and
sold under the Plan is 4,987,500 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)   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.

                  (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)  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, 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;


                                       3
<PAGE>   4
                  (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 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);

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

                  (viii) 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 Administrator'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 or
Consultants. Incentive Stock Options may be granted only to Employees. 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.

            (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


                                       4
<PAGE>   5
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
stockholders 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
Administrator, 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.

            (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


                                       5
<PAGE>   6
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) 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, (7) delivery of a properly executed exercise notice
together with such other documentation as the Administrator and the broker, if
applicable, shall require to effect an exercise of the Option and delivery to
the Company of the sale or loan proceeds required to pay the exercise price; (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 corporation law).

      9.    Exercise of Option.

            (a)   Procedure for Exercise; Rights as a Stockholder. 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 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 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 13 of the Plan.

                  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 Continuous Status as an Employee or Consultant, such Optionee may,
but only within thirty (30) days (or within 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 such time period
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


                                       6
<PAGE>   7
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 Continuous
Status as an Employee or Consultant 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
while Optionee is an Employee or Consultant, 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)   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.

      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 50% 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
ninety (90) 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


                                       7
<PAGE>   8
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.

            (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 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 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 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").

      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, Merger or Asset Sale.
Subject to any required action by the stockholders 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 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.


                                       8
<PAGE>   9
            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, or the sale of all or substantially all of the Company's assets,
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 the 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 the 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 the Option shall be fully
exercisable for a period of fifteen (15) days from the date of such notice, and
the 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 Section 422 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 stockholder 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 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.


                                       9
<PAGE>   10
      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.   Stockholder Approval. Continuance of the Plan shall be subject to
approval by the stockholders of the Company within twelve (12) months before or
after the date the Plan is adopted. Such stockholder approval shall be obtained
in the degree and manner required under applicable state and federal law.

      20.   Limitations. The following limitations shall apply to grants of
Options and Stock Purchase Rights to Employees.

            (a)   No Employee shall be granted, in any fiscal year of the
Company, Options and Stock Purchase Rights to purchase more than 250,000 Shares.

            (b)   In connection with his or her initial employment, an Employee
may be granted Options and Stock Purchase Rights to purchase up to an additional
250,000 Shares which shall not count against the limit set forth in Section
20(a) above.

            (c)   The foregoing limitations shall be adjusted proportionately in
connection with any change in the Company's capitalization as described in
Section 13.

            (d)   If an Option or Stock Purchase Right is cancelled in the same
fiscal year of the Company in which it was granted (other than in connection
with a transaction described in Section 13), the cancelled Option or Stock
Purchase Right will be counted against the limits set forth in Sections 20(a)
and 20(b) above. For this purpose, if the exercise price of an Option or Stock
Purchase Right is reduced, the transaction will be treated as a cancellation of
the Option or Stock Purchase Right and the grant of a new Option or Stock
Purchase Right.


                                       10

<PAGE>   1
                                                                     EXHIBIT 4.2


                        INTEGRATED SILICON SOLUTION, INC.

                        1993 EMPLOYEE STOCK PURCHASE PLAN
                      (as amended through October 21, 1997)


      The following constitute the provisions of the 1993 Employee Stock
Purchase Plan of Integrated Silicon Solution, 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 Integrated Silicon Solution, Inc., and
any Designated Subsidiary of the Company.

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

            (f)   "Designated Subsidiaries" shall mean the Subsidiaries which
have 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 will 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.

            (j)   "Fair Market Value" shall mean, as of any date, the value of
Common Stock determined as follows:


<PAGE>   2
                  (1)   If the Common Stock is listed on any established stock
exchange or a national market system, including without limitation the National
Market of the National Association of Securities Dealers, Inc. Automated
Quotation ("NASDAQ") System, its Fair Market Value shall be the closing sale
price for the Common Stock (or the mean of the closing bid and asked prices, if
no sales were reported), as quoted on such exchange (or the exchange with the
greatest volume of trading in Common Stock) or system on the date of such
determination, as reported in The Wall Street Journal or such other source as
the Board deems reliable, or;

                  (2)   If the Common Stock is quoted on the NASDAQ system (but
not on the National Market thereof) or 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)   Notwithstanding paragraphs (1) and (2), in the case of
an Offering Period commencing substantially concurrent with the Company's
initial public offering, the Fair Market Value may be determined by the Board to
be equal to the initial price to the public of shares of Common Stock in such
offering; or

                  (4)   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.

            (k)   "Offering Period" shall mean the period 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 February 1 and
August 1 of each year and terminating on the last Trading Day in the periods
ending twenty-four (24) months later. 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.

            (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.


                                       2
<PAGE>   3
            (q)   "Trading Day" shall mean a day on which national stock
exchanges and the National Association of Securities Dealers Automated Quotation
(NASDAQ) System are open for trading.

      3.    Eligibility.

            (a)   Any Employee (as defined in Section 2(g)), 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) if, 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) which
permits his or her rights to purchase stock under all employee stock purchase
plans of the Company and its subsidiaries to accrue 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 April 1 and October 1 each year, or on such other dates
as the Board shall determine, and continuing thereafter until terminated in
accordance with Section 19 hereof. The Board shall have the power to change the
duration of Offering Periods (including the commencement and termination dates
thereof) with respect to future offerings without stockholder 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.

            (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 ten percent (10%) of the
Compensation which he or she receives on each pay day during the Offering
Period, and the aggregate of such payroll deductions during the Offering Period
shall not exceed ten percent (10%) of the participant's Compensation during said
Offering Period.


                                       3
<PAGE>   4
            (b)   All payroll deductions made for a participant shall be
credited to his or her account under the Plan and will 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 0% at such time during any
Purchase Period which is scheduled to end during the current calendar year (the
"Current Purchase Period") that the aggregate of all payroll deductions which
were previously used to purchase stock under the Plan in a prior Purchase Period
which ended during that calendar year plus all payroll deductions accumulated
with respect to the Current Purchase Period equal $21,250. 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 will 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.

      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 in no event shall
an Employee be permitted to purchase during each Purchase Period more than a
number of Shares determined by dividing $12,500 by the Fair Market Value of a
share of the Company's Common Stock on the Enrollment Date (except if there is
only one Purchase Period in a calendar year, in which case the dollar limit in
the preceding equation shall be $25,000 instead of $12,500), and provided
further 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, and shall expire on the last day of the Offering Period.


                                       4
<PAGE>   5
      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 will
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 will 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 withdrawal 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; Termination of Employment.

            (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 will be paid to such participant
promptly after receipt of notice of withdrawal and such participant's option for
the Offering Period will be automatically terminated, and no further payroll
deductions for the purchase of shares will be made for such Offering Period. If
a participant withdraws from an Offering Period, payroll deductions will not
resume at the beginning of the succeeding Offering Period unless the participant
delivers to the Company a new subscription agreement.

            (b)   Upon a participant's ceasing to be an Employee (as defined in
Section 2(g) hereof), for any reason, including by virtue of him or her having
failed to remain an Employee of the Company for at least twenty (20) hours per
week during an Offering Period in which the Employee is a participant, he or she
will 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 will be returned to such participant or, in
the case of his or her death, to the person or persons entitled thereto under
Section 14 hereof, and such participant's option will be automatically
terminated.

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

      12.   Stock.

            (a)   The maximum number of shares of the Company's Common Stock
which shall be made available for sale under the Plan shall be 1,450,000 Shares,
subject to adjustment upon changes in capitalization of the Company as provided
in Section 18 hereof. 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.


                                       5
<PAGE>   6
            (b)   The participant will 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 will be
registered in the name of the participant or in the name of the participant and
his or her spouse.

      13.   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 exclusive 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. Members of the Board
who are eligible Employees are permitted to participate in the Plan, provided
that:

                  (1)   Members of the Board who are eligible to participate in
the Plan may not vote on any matter affecting the administration of the Plan or
the grant of any option pursuant to the Plan.

                  (2)   If a Committee is established to administer the Plan, no
member of the Board who is eligible to participate in the Plan may be a member
of the Committee.

      14.   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 participant'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.

      15.   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 14 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.


                                       6
<PAGE>   7
      16.   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.

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

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

            (a)   Changes in Capitalization. Subject to any required action by
the stockholders of the Company, the Reserves as well as the price per share 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 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 will 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, each option under the Plan 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 the
successor corporation refuses to assume or substitute for the option, any
Purchase Periods than 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 prior to the date
of the Company's proposed sale or merger. If the Board sets a new Exercise Date,
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 his option has
been changed to the New Exercise Date and that his option will be exercised
automatically on the New Exercise Date, unless prior to such date he has
withdrawn from the Offering Periods as provided in Section 10 hereof.

      19.   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 18 hereof,
no such termination can affect options previously granted, provided that an
Offering Period may be terminated by the Board of


                                       7
<PAGE>   8
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 stockholders. Except as
provided in Section 18 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 Rule 16b-3 or under Section 423 of the Code
(or any successor rule or provision or any other applicable law or regulation),
the Company shall obtain stockholder approval in such a manner and to such a
degree as required.

            (b)   Without stockholder 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 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.

      20.   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.

      21.   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 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 applicable provisions of law.

      22.   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
stockholders of the Company. It shall continue in effect for a term of ten (10)
years unless sooner terminated under Section 19 hereof.

      23.   Automatic Transfer to Low Price Offering Period. If the Fair Market
Value of the Common Stock on any Exercise Date in an Offering Period is 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. EXHIBIT A


                                       8
<PAGE>   9
                        INTEGRATED SILICON SOLUTION, INC.

                        1993 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 Integrated Silicon Solution, Inc. 1993 Employee Stock Purchase Plan
      (the "Employee Stock Purchase Plan") and subscribes to purchase 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 (1-10%) 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 "Integrated Silicon Solution, Inc.
      1993 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 obtaining stockholder 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):
      _______________________________________.


                                       2
<PAGE>   10
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 over the price which I paid for the
      shares. I HEREBY AGREE TO NOTIFY THE COMPANY IN WRITING 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 compen sation the amount
      necessary to meet any applicable withholding obligation including any
      withholding necessary to make available to the Company any tax deductions
      or benefits attribu table 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)


                                       3
<PAGE>   11
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 
                                            is other than spouse)


                                       4
<PAGE>   12
                                    EXHIBIT B


                        INTEGRATED SILICON SOLUTION, INC.

                        1993 EMPLOYEE STOCK PURCHASE PLAN

                              NOTICE OF WITHDRAWAL


      The undersigned participant in the Offering Period of the Integrated
Silicon Solution, Inc. 1993 Employee Stock Purchase Plan which began on
____________, 19____ (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 understands 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:__________________________


                                       5

<PAGE>   1
                                                                     EXHIBIT 4.3


                        INTEGRATED SILICON SOLUTION, INC.

                             NONSTATUTORY STOCK PLAN

           (AS AMENDED BY THE BOARD OF DIRECTORS ON JANUARY 30, 1998)


      1.    Purposes of the Plan. The purposes of this 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. Only
nonstatutory stock options may 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 Integrated Silicon Solution, Inc., a Delaware
corporation.

            (g)   "Consultant" means any person, including an advisor, who is
engaged by the Company or any parent, subsidiary or affiliate to render
services.

            (h)   "Continuous Status as an Employee or Consultant" means the
absence of any interruption or termination of service as an Employee or
Consultant. Continuous Status as an Employee or Consultant shall not be
considered interrupted in the case of: (i) sick leave; (ii) military leave;
(iii) any other leave of absence approved by the Company; (iv) transfer between
locations of the Company or between the Company, its subsidiaries, successors or
affiliates; or (v) change in status from Employee to Consultant or Consultant to
Employee.

            (i)   "Employee" means any person employed by the Company or any
parent, subsidiary or affiliate of the Company other than any executive officer
of the Company within the meaning of Section 16 of the Exchange Act. 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:


<PAGE>   2
                  (i)   If the Common Stock is listed on any established stock
exchange or a national market system including without limitation the National
Market 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, for the day 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 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 on
the date of determination 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)   "Option" means a nonstatutory stock option granted pursuant to
the Plan. Such option is not intended to qualify as an incentive stock option
within the meaning of Section 422 of the Code.

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

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

            (o)   "Plan" means this Nonstatutory Stock Plan.

            (p)   "Share" means a share of the Common Stock, as adjusted in
accordance with Section 12 of the Plan.

      3.    Stock Subject to the Plan. Subject to the provisions of Section 12
of the Plan, the maximum aggregate number of shares which may be optioned and
sold under the Plan is 2,493,500 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)   Administration. The Plan shall be administered by (i) the
Board or (ii) a Committee designated by the Board, which Committee shall be
constituted to satisfy applicable laws. Once appointed, such Committee shall
serve in its designated capacity until otherwise directed by the Board. The
Board may increase the size of the Committee and appoint additional members,
remove members (with or without cause) and substitute new members, fill
vacancies (however caused), and remove all members of the Committee and
thereafter directly administer the Plan, all to the extent permitted by
applicable laws.


                                      -2-
<PAGE>   3
            (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;

                  (ii)  to select the Consultants and Employees to whom Options
may from time to time be granted hereunder;

                  (iii) to determine whether and to what extent Options, 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 restriction or limitation, or any vesting
acceleration or waiver of forfeiture restrictions regarding any Option 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);

                  (vii) to determine whether and under what circumstances an
Option may be settled in cash under Section 9(e) instead of Common Stock;

                  (viii) 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); and

                  (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.

            (c)   Effect of Administrator'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)   Options may be granted to Employees or Consultants.

            (b)   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.


                                      -3-
<PAGE>   4
      6.    Term of Plan. The Plan shall become effective upon its adoption by
the Board of Directors. It shall continue in effect until terminated under
Section 14 of the Plan.

      7.    Term of Option. The term of each Option shall be the term stated 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
Administrator.

            (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 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) 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, (7)
delivery of a properly executed exercise notice together with such other
documentation as the Administrator and the broker, if applicable, shall require
to effect an exercise of the Option and delivery to the Company of the sale or
loan proceeds required to pay the exercise price; (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.

      9.    Exercise of Option.

            (a)   Procedure for Exercise; Rights as a Stockholder. 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 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 stock certificate promptly


                                      -4-
<PAGE>   5
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 12 of the Plan.

                  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 Continuous Status as an Employee or Consultant, such Optionee may,
but only within thirty (30) days (or within such other period of time as is
determined by the Board), 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 Continuous
Status as an Employee or Consultant 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. Notwithstanding the provisions of Section
9(b) above, in the event of the death of an Optionee while Optionee is an
Employee or Consultant, 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)   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.

      10.   Non-Transferability of Options. Unless otherwise provided for by the
Administrator, 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 Withholding to Satisfy Withholding Tax Obligations. At the
discretion of the Administrator, Optionees may satisfy withholding obligations
as provided in this paragraph. When an Optionee incurs tax liability in
connection with an Option, which tax liability is subject to tax withholding
under applicable tax laws, and the Optionee is obligated to pay the Company an
amount


                                      -5-
<PAGE>   6
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, 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.

      12.   Adjustments Upon Changes in Capitalization, Merger or Asset Sale.
Subject to any required action by the stockholders 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 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, or the sale of all or substantially all of the Company's assets,
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 the 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 the 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 the Option shall be fully
exercisable for a period of fifteen (15) days from the date of such notice, and
the Option will terminate upon the expiration of such period.

      13.   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.

      14.   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.


                                      -6-
<PAGE>   7
            (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 Optionee and
the Board, which agreement must be in writing and signed by the Optionee and the
Company.

      15.   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.

      16.   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.

      17.   Agreements. Options shall be evidenced by written agreements in such
form as the Board shall approve from time to time.


                                      -7-
<PAGE>   8
                             NONSTATUTORY 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:                     Nonstatutory Stock Option

      Term/Expiration Date:               ______________

      Vesting Schedule:                   ______________

      Subject to the Optionee continuing to be an Employee or Consultant on such
dates, this Option shall vest and become exercisable in accordance with the
following schedule:

      [25% of the Shares subject to the Option shall vest twelve months after
the Vesting Commencement Date, and 1/48th of the Shares subject to the Option
shall vest at the end of each one-month period thereafter.]

      Termination Period:

      This Option may be exercised for thirty days after Optionee ceases to be
an Employee or Consultant( or within such other period of time as is determined
by the Board). 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


                                      -1-
<PAGE>   9
Grant (the "Exercise Price"), subject to the terms and conditions of the Plan,
which is incorporated herein by reference. Subject to Section 14(b) 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.

      2.    Exercise of Option.

            (1)   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.

            (2)   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 Chief Financial Officer. 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.

      3.    Method of Payment. Payment of the aggregate Exercise Price shall be
by any of the methods set forth in Section 8(b) of the Plan.

      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.

            (1)   Exercising the Option. The Optionee may incur regular federal
income tax liability upon exercise of an 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 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.

            (2)   Disposition of Shares. 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.


                                      -2-
<PAGE>   10
      7.    Entire Agreement. 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 to the Optionee's
interest except by means of a writing signed by the Company and Optionee.

      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 AN EMPLOYEE OR CONSULTANT 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 AN
EMPLOYEE OR CONSULTANT 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 AN EMPLOYEE OR CONSULTANT 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:                                  INTEGRATED SILICON SOLUTION, INC.

Signature: ___________________________     By:__________________________________

Print Name: __________________________     Title:_______________________________

Address: _____________________________
         _____________________________


                                      -3-
<PAGE>   11
                                    EXHIBIT A
                             NONSTATUTORY STOCK PLAN
                                 EXERCISE NOTICE


Gary Fischer
Integrated Silicon Solution, Inc.
2231 Lawson Lane
Santa Clara, CA  95054

      1.    Exercise of Option. Effective as of today, ________________, 199__,
the undersigned ("Purchaser") hereby elects to purchase ______________ shares
(the "Shares") of the Common Stock of Integrated Silicon Solution, Inc. (the
"Company") under and pursuant to the Nonstatutory 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.

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

      3.    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.

      4.    Rights as Shareholder. 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 shareholder 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 13 of the
Plan.

      5.    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.

      6.    Entire Agreement. 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 signed by the Company and Purchaser.

Submitted by:                          Accepted on _________, 19__ by:

PURCHASER:                             INTEGRATED SILICON SOLUTION, INC.

Signature: _________________________   By: _________________________________

Print Name: ________________________   Title: ______________________________

Address: ___________________________   Address:   2231 Lawson Lane
         ___________________________              Santa Clara, CA 95054



<PAGE>   1
                                                                     EXHIBIT 5.1


                                  April 22,1998

Integrated Silicon Solution, Inc.
2231 Lawson Lane
Santa Clara, CA 95054

      RE:   REGISTRATION STATEMENT ON FORM S-8

Ladies and Gentlemen:

      We have examined the Registration Statement on Form S-8 to be filed by you
with the Securities and Exchange Commission on or about April 22, 1998 (the
"Registration Statement") in connection with the registration under the
Securities Act of 1933, as amended (the "Act"), of 500,000 shares of your Common
Stock issuable under your 1989 Stock Plan, 1,000,000 shares of your Common Stock
issuable under your 1993 Employee Stock Purchase Plan and 1,000,000 shares of
your Common Stock issuable under your Nonstatutory Stock Plan. Such shares of
Common Stock are referred to herein as the "Shares" and the 1989 Stock Plan, the
1993 Employee Stock Purchase Plan and the Nonstatutory Stock Plan are referred
to herein as the "Plans". As your counsel in connection with this transaction,
we have examined the proceedings taken and are familiar with the proceedings
proposed to be taken by you in connection with the issuance and sale of the
Shares pursuant to the Plans.

      It is our opinion that, upon completion of the actions being taken, or
contemplated by us as your counsel to be taken by you prior to the issuance of
the Shares pursuant to the Registration Statement and the Plans and upon
completion of the actions being taken in order to permit such transactions to be
carried out in accordance with the securities laws of the various states where
required, the Shares will be legally and validly issued, fully-paid and
non-assessable.

      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,

                                       WILSON SONSINI GOODRICH & ROSATI
                                       Professional Corporation

                                       /s/ Wilson Sonsini Goodrich & Rosati



<PAGE>   1
                                                                    EXHIBIT 23.1


                         CONSENT OF INDEPENDENT AUDITORS


We consent to the incorporation by reference in the Registration Statement (Form
S-8) pertaining to the 1989 Stock Plan, the 1993 Employee Stock Purchase Plan
and the Nonstatutory Stock Plan of Integrated Silicon Solution, Inc. of our
report dated October 27, 1997, except for Note 17 as to which the date is
December 3, 1997, with respect to the consolidated financial statements and
schedule of Integrated Silicon Solution, Inc. included in its Annual Report
(Form 10-K/A) for the year ended September 30, 1997, filed with the Securities
and Exchange Commission.

/s/ Ernst & Young LLP

San Jose, California
April 22, 1998



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