XIRCOM INC
S-8, 1998-04-21
COMPUTER COMMUNICATIONS EQUIPMENT
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<PAGE>
 
     As filed with the Securities and Exchange Commission on April 21, 1998
                                  Registration No. _____________
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

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

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

                                  XIRCOM, INC.
               (Exact name of issuer as specified in its charter)

             CALIFORNIA                                  95-4221884
 -----------------------------------       ----------------------------------
   (STATE OF INCORPORATION)                (IRS EMPLOYER IDENTIFICATION NO.)

                          2300 Corporate Center Drive
                        Thousand Oaks, California 91320
                    (Address of Principal Executive Offices)

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

                             1992 STOCK OPTION PLAN

                                      AND

                       1994 EMPLOYEE STOCK PURCHASE PLAN

                                      AND

                             1995 STOCK OPTION PLAN

                                      AND

                      1997 PATENT AWARD STOCK OPTION PLAN
                            (Full title of the plan)

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

                              Steven F. DeGennaro
                            Chief Financial Officer
                                  XIRCOM, INC.
                          2300 Corporate Center Drive
                        Thousand Oaks, California 91320
                    (Name and address of agent for service)
                                 (805) 376-9300
         (Telephone number, including area code, of agent for service)

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

                                    Copy to:
                             Howard S. Zeprun, Esq.
                        WILSON SONSINI GOODRICH & ROSATI
                            Professional Corporation
                               650 Page Mill Road
                          Palo Alto, California 94304
                           Telephone:  (415) 493-9300
<PAGE>
 
                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------
    Title of                               Proposed              Proposed
Securities to be       Amount to       Maximum Offering      Maximum Aggregate       Amount of
   Registered        be Registered      Price Per Share       Offering Price      Registration Fee
- ----------------------------------------------------------------------------------------------------
<S>                  <C>               <C>                   <C>                  <C>
Common Stock,
$0.001 par value

Upon exercise of     900,000 shs.       $14.97(1)             $13,473,000(1)          $3,974.54
   options under
   1992 Stock
   Option Plan

Upon exercise of     200,000 shs.       $14.97(1)             $ 2,994,000(1)          $  883.23
   options under
   1994 Employee
   Stock Purchase
   Plan

Upon exercise of     300,000 shs.       $14.97(1)             $ 4,491,000(1)          $1,324.85
   options under
   1995 Stock
   Option Plan

Upon exercise of     250,000 shs.       $14.97(1)             $ 3,742,500(1)          $1,104.04
   options under
   1997 Patent
   Award Stock
   Option Plan


TOTAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $7,286.66
</TABLE>

- - --------------------
(1)  Estimated in accordance with Rule 457 solely for the purpose of
 calculating the registration fee on the basis of the average between the
 high and low price of the Registrant's Common Stock as reported on the
 Nasdaq National Market on April 16, 1998.

=============================================================================
<PAGE>
 
                                 XIRCOM, 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 contents of the Registration Statement on Form S-8, file number
33-49170, filed by the Company with the Securities and Exchange Commission on
July 2, 1992.

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

     3.   The Company's Quarterly Report on Form 10-Q for the quarter ending
December 31, 1997, filed pursuant to Section 13 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 February 11, 1992, 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 6.   INDEMNIFICATION OF DIRECTORS AND OFFICERS.
          ------------------------------------------

     Section 204 of the General Corporation Law of the State of California
("California Law") authorizes a corporation to adopt a provision in its articles
of incorporation eliminating the personal liability of directors to corporations
and their shareholders for monetary damages for breach or alleged breach of
directors' "duty of care."  Following a California corporation's adoption of
such a provision, its directors are not accountable to corporations and their
shareholders for monetary damages for conduct constituting negligence (or gross
negligence) in the exercise of their fiduciary duties; however, directors
continue to be subject to equitable remedies such as injunction or rescission.
Under California Law, a director also continues to be liable for (1) a breach of
his or her duty of loyalty; (2) acts or omissions not in good faith or involving
intentional misconduct or knowing violations of law; (3) illegal payments of
dividends; and (4) approval of any transaction from which a director derives an
improper personal benefit.  The adoption of such a provision in the articles of
incorporation also does not limit directors' liability for violations of the
federal securities laws.

     Section 317 of the California Law makes a provision for the indemnification
of officers, directors and other corporate agents in terms sufficiently broad to
indemnify such persons, under certain circumstances, for liabilities (including
reimbursement for expenses incurred) arising under the Securities Act of 1933,
as amended (the "Securities Act").  An amendment to Section 317 provides that
the indemnification provided by this section is not exclusive to the extent
additional rights are authorized in a corporation's articles of incorporation.

   The Company has adopted provisions in its Amended Articles of Incorporation
which eliminate the liability of its directors for monetary damages and
authorize the Company to indemnify its officers, directors and other agents to
the fullest extent permitted by law.
<PAGE>
 
ITEM 8.  EXHIBITS.
         --------
<TABLE>
<CAPTION>
         Exhibit
         Number           Description
         -------          -----------
         <S>              <C>
         4.1              1992 Stock Option Plan, as amended.

         4.2              1994 Employee Stock Purchase Plan, as amended

         4.3              1995 Stock Option Plan, as amended.

         4.4              1997 Patent Award Stock Option Plan.

         5.1              Opinion of counsel as to legality of securities being
                          registered.

        23.1              Consent of Ernst & Young, LLP, independent auditors.

        24.2              Consent of counsel (contained in Exhibit 5.1).

        25.1              Power of Attorney (see page II-4).
</TABLE>

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.
<PAGE>
 
                                  SIGNATURES

         Pursuant to the requirements of the Securities Act that 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 Thousand Oaks, State of California, on April 21,
1998.

                                        XIRCOM, INC.

                                        By: /s/ DIRK I. GATES
                                            ----------------------------------
                                            Dirk I. Gates, Chairman, President
                                            and Chief Executive Officer

                               POWER OF ATTORNEY

         KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Dirk I. Gates and Steven F. DeGennaro,
jointly and severally, his attorneys-in-fact, each with the power of
substitution, for him 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 by the following persons in the capacities and on
the dates indicated.
 
<TABLE>
<CAPTION>
Signature                             Title                                 Date
- ------------------------------        ----------------------------------------------------
<S>                                   <C>
 /s/ DIRK I. GATES                    President and Chief Executive         April 21, 1998
 --------------------------------     Officer and Director (Principal
 (Dirk I. Gates)                      Executive Officer)

 /s/ STEVEN F. DEGENNARO              Vice President, Finance and           April 21, 1998
 --------------------------------     Chief Financial Officer (Principal
 (Steven F. DeGennaro)                Accounting Officer)

 /s/ MICHAEL F. G. ASHBY              Director                              April 21, 1998
 --------------------------------
 (Michael F. G. Ashby)

 /s/ KENNETH J. BIBA                  Director                              April 21, 1998
 --------------------------------
 (Kenneth J. Biba)

 /s/ GARY J. BOWEN                    Director                              April 21, 1998
 --------------------------------
 (Gary J. Bowen)

  /s/ J. KIRK MATHEWS                 Director                              April 21, 1998
 --------------------------------
 (J. Kirk Mathews)

 /s/ WILLIAM J. SCHROEDER             Director                              April 21, 1998
 --------------------------------
 (William J. Schroeder)

 /s/ DELBERT W. YOCAM                 Director                              April 21, 1998
 --------------------------------
 (Delbert W. Yocam)
</TABLE>
<PAGE>
 
                               INDEX TO EXHIBITS
<TABLE>
<CAPTION>

 EXHIBIT
 NUMBER                DESCRIPTION
- --------        ------------------------------------------------------
<S>             <C>
     4.1        1992 Stock Option Plan, as amended

     4.2        1994 Employee Stock Purchase Plan, as amended

     4.3        1995 Stock Option Plan, as amended

     4.4        1997 Patent Award Stock Option Plan

     5.1        Opinion of counsel as to legality of securities being
                registered

    23.1        Consent of Ernst & Young, LLP, Independent Auditors

    24.2        Consent of Counsel (Contained in Exhibit 5.1.)

    25.1        Power of Attorney (included in signature pages to this 
                registration statement)
</TABLE>

<PAGE>
 
                                                                     EXHIBIT 4.1

                                 XIRCOM, INC.
                            1992 STOCK OPTION PLAN

                  As amended and restated on January 23, 1998


     1.  Purpose of the Plan.  The purpose of the Xircom, Inc. 1992 Stock Option
         -------------------                                                    
Plan is to enable Xircom, Inc. to provide an incentive to eligible employees,
consultants and officers whose present and potential contributions are important
to the continued success of the Company, to afford these individuals the
opportunity to acquire a proprietary interest in the Company and to enable the
Company to enlist and retain qualified personnel for the successful conduct of
its business.  It is intended that this purpose will be effected through the
granting of (a) stock options, (b) stock purchase rights, (c) stock appreciation
rights, and (d) long-term performance awards.

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

         (a) "Administrator" means the Board or such of its Committees as shall
              -------------                                                    
be administering the Plan, in accordance with Section 8 of the Plan.

         (b) "Applicable Laws" means the legal requirements relating to the
              ---------------                                              
administration of stock option plans under applicable securities laws,
California corporate law and the Code.

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

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

         (e) "Committee"  means a Committee appointed by the Board in
              ---------                                              
accordance with Section 8 of the Plan.

         (f) "Common Stock" means the Common Stock, $.001 par value, of the
              ------------                                                 
Company.

         (g) "Company" means Xircom, Inc., a California corporation.
              -------                                               

         (h) "Consultant" means any person, including an advisor, engaged by
              ----------                                                    
the Company or a Parent or Subsidiary to render services and who is compensated
for such services, provided that the term "Consultant" shall not include
Directors who are paid only a director's fee by the Company or who are not
compensated by the Company for their services as Directors.

         (i) "Continuous Status as an Employee or Consultant" means that the
              ----------------------------------------------                
employment or consulting relationship is not interrupted or terminated by the
Company, any Parent or Subsidiary.  Continuous Status as an Employee or
Consultant shall not be considered interrupted in the case of:  (i) any leave of
absence approved by the Administrator, including sick leave, military leave, or
any other personal leave; provided, however, that for purposes of Continuous
                          --------                                          
Status as an Employee or Consultant, no such leave may exceed ninety (90) days,
unless reemployment upon the expiration of such leave is guaranteed by contract
(including written Company policies) or statute or unless (in the case of
Options and Rights other than Incentive Stock Options) the Administrator has
expressly designated a longer leave period during which (for purposes of such
Options or Rights) Continuous Status as an Employee or Consultant shall
continue; or (ii) transfers between locations of the Company or between the
Company, its Parent, its Subsidiaries or its successor.

         (j) "Director" means a member of the Board.
              --------                              

         (k) "Disability" means total and permanent disability as defined in
              ----------                                                    
Section 22(e)(3) of the Code.

         (l) "Employee" means any person, including Officers and Directors,
              --------                                                     
employed by the Company or any Parent or Subsidiary of the Company.  Neither
service as a Director nor payment of a director's fee by the Company shall be
sufficient to constitute "employment" by the Company.
<PAGE>
 
         (m) "Exchange Act" means the Securities Exchange Act of 1934, as
              ------------                                               
amended.

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

                 (i) If the Common Stock is listed on any established stock 
exchange or a national market system, including without limitation the Nasdaq
National Market, the Fair Market Value of a Share of Common Stock shall be the
closing sales price for such stock (or the closing bid, if no sales were
reported) as quoted on such system or exchange (or the exchange with the
greatest volume of trading in Common Stock) on the day of determination (or, if
the day of determination is not a market trading day, then on the last market
trading day prior to the day of determination), as reported in The Wall Street
Journal or such other source as the Administrator deems reliable;

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

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

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

         (p) "Long-Term Performance Award" means an award under Section 7
              ---------------------------                                
below.  A Long-Term Performance Award shall permit the recipient to receive a
cash or stock bonus (as determined by the Administrator) upon satisfaction of
such performance factors as are set out in the recipient's individual grant.
Long-Term Performance Awards will be based upon the achievement of the Company,
Subsidiary and/or individual performance factors or upon such other criteria as
the Administrator may deem appropriate.

         (q) "Long-Term Performance Award Agreement" means a written agreement
              -------------------------------------                           
between the Company and an Optionee evidencing the terms and conditions of an
individual Long-Term Performance Award grant.  The Long-Term Performance Award
Agreement is subject to the terms and conditions of the Plan.

         (r) "Nonstatutory Stock Option" means any Option that is not an
              -------------------------                                 
Incentive Stock Option.

         (s) "Notice of Grant" means a written notice evidencing certain terms
              ---------------                                                 
and conditions of an individual Option, Stock Purchase Right, SAR or Long-Term
Performance Award grant.  The Notice of Grant is part of the Option Agreement,
the SAR Agreement and the Long-Term Performance Award Agreement.

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

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

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

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

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

         (y) "Optionee" means an Employee or Consultant who holds an
              --------                                              
outstanding Option or Right.

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

         (aa) "Plan" means this 1992 Stock Option Plan.
               ----                                    
<PAGE>
 
         (bb) "Restricted Stock" means shares of Common Stock subject to a
               ----------------                                           
Restricted Stock Purchase Agreement acquired pursuant to a grant of Stock
Purchase Rights under Section 6 below.

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

         (dd) "Right" means and includes SARs, Long-Term Performance Awards and
               -----                                                           
Stock Purchase Rights granted pursuant to the Plan.

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

         (ff) "SAR" means a stock appreciation right granted pursuant to
               ---                                                      
Section 5 of the Plan.

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

         (hh) "Share" means a share of the Common Stock, as adjusted in
               -----                                                   
accordance with Section 10 of the Plan.

         (ii) "Stock Purchase Right" means the right to purchase Common Stock
               --------------------                                          
pursuant to Section 6 of the Plan, as evidenced by a Notice of Grant.

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

     3.  Shares Subject to the Plan.  Subject to the provisions of Section 10 of
         --------------------------                                             
the Plan, the total number of Shares reserved and available for distribution
under the Plan is 7,500,000 Shares.  Subject to Section 10 of the Plan, if any
Shares that have been optioned under an Option cease to be subject to such
Option (other than through exercise of the Option), or if any Option or Right
granted hereunder is forfeited or any such award otherwise terminates prior to
the issuance of Common Stock to the participant, the shares that were subject to
such Option or Right shall again be available for distribution in connection
with future Option or right grants under the Plan; provided, however, that
                                                   --------               
Shares that have actually been issued under the Plan, whether upon exercise of
an Option or Right, shall not in any event be returned to the Plan and shall not
become available for future distribution under the Plan.

     4.  Eligibility.  Nonstatutory Stock Options and Rights may be granted to
         -----------                                                          
Employees and Consultants.  Incentive Stock Options may be granted only to
Employees.  If otherwise eligible, an Employee or Consultant who has been
granted an Option or Right may be granted additional Options or Rights.

     5.  Options and SARs.
         ---------------- 

         (a) Options.  The Administrator, in its discretion, may grant Options
             -------                                                          
to eligible participants and shall determine whether such Options shall be
Incentive Stock Options or Nonstatutory Stock Options.  Each Option shall be
evidenced by a Notice of Grant which shall expressly identify the Options as
Incentive Stock Options or as Nonstatutory Stock Options, and be in such form
and contain such provisions as the Administrator shall from time to time deem
appropriate.  Without limiting the foregoing, the Administrator may at any time
authorize the Company, with the consent of the respective recipients, to issue
new Options or Rights in exchange for the surrender and cancellation of
outstanding Options or Rights.  Option agreements shall contain the following
terms and conditions:

                 (i) Exercise Price; Number of Shares.  The per Share exercise
                     --------------------------------
price for the Shares issuable pursuant to an Option shall be such price as is
determined by the Administrator; provided, however, that in the case of an
                                 --------                                 
Incentive Stock Option, the price shall be no less than 100% of the Fair Market
Value of the Common Stock on the date the Option is granted, subject to any
additional conditions set out in Section 5(a)(iv) below.

                 The Notice of Grant shall specify the number of Shares to which
it pertains.

                (ii) Waiting Period and Exercise Dates.  At the time an Option
                     ---------------------------------
is granted, the Administrator will determine the terms and conditions to be
satisfied before Shares may be purchased, including the dates on which Shares
subject to the Option may first be purchased.  The Administrator may specify
that an Option may not be exercised until the completion of the service period
specified at the time of grant.  (Any such 
<PAGE>
 
period is referred to herein as the "waiting period.") At the time an Option is
granted, the Administrator shall fix the period within which the Option may be
exercised, which shall not be earlier than the end of the waiting period, if
any, nor, in the case of an Incentive Stock Option, later than ten (10) years,
from the date of grant.

               (iii)  Form of Payment.  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 (1) in the case of Shares acquired
upon exercise of an option, have been owned by the Optionee for more than six
months on the date of surrender, and (2) have a Fair Market Value on the date of
surrender not greater than the aggregate exercise price of the Shares as to
which said Option shall be exercised;

                      (5)  delivery of a properly executed exercise notice 
together with such other documentation as the Administrator and any broker
approved by the Company, 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;

                      (6)  any combination of the foregoing methods of payment;
or

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

                (iv) Limitations.  In addition to the foregoing, Options, SARs
                     -----------
and Stock Purchase Rights granted under the Plan shall be subject to the 
following terms and conditions:

                      (1)  Dollar Limitation with Respect to Incentive Stock 
                           -------------------------------------------------
Options. To the extent that the aggregate Fair Market Value of (a) the Shares
- -------
with respect to which Options designated as Incentive Stock Options plus (b) the
shares of stock of the Company, Parent and any Subsidiary with respect to which
other incentive stock options are exercisable for the first time by an Optionee
during any calendar year under all plans of the Company and any Parent and
Subsidiary exceeds $100,000, such Options shall be treated as Nonstatutory Stock
Options. For purposes of the preceding sentence, (a) Options shall be taken into
account in the order in which they were granted, and (b) the Fair Market Value
of the Shares shall be determined as of the time the Option or other incentive
stock option is granted.

                      (2)  Requirements with Respect to Incentive Stock Options
                           ----------------------------------------------------
granted to 10% Shareholders.  If any Optionee to whom an Incentive Stock Option
- ---------------------------
is to be granted pursuant to the provisions of the Plan is, on the date of
grant, the owner of Common Stock (as determined under Section 424(d) of the
Code) possessing more than 10% of the total combined voting power of all classes
of stock of the Company or any Parent or Subsidiary of the Company, then the
following special provisions shall be applicable to the Option granted to such
individual:

                           (a) The per Share Option price of Shares subject to
such Incentive Stock Option shall not be less than 110% of the Fair Market Value
of Common Stock on the date of grant; and

                           (b) The Option shall not have a term in excess of
five (5) years from the date of grant.

                      (3)  Limitation on Total Grants Under Plan. "No Employee
                           -------------------------------------
shall be granted, in any fiscal year of the Company, Options, SARs granted 
independently of Options and/or Stock Purchase Rights for greater than an
aggregate of 250,000 shares of Common Stock (subject to appropriate adjustment
pursuant to Section 10 below), provided that a new employee of the Company may
be granted in a single fiscal year upon joining the Company Options, SARs
granted independently of Options and Stock Purchase Rights for up to an
aggregate of 500,000 shares of Common Stock (subject to appropriate adjustment
pursuant to Section 10 below).
<PAGE>
 
                            Except as modified by the preceding provisions of
this subsection 5(a)(iv) and except as otherwise limited by Section 422 of the
Code, all of the provisions of the Plan shall be applicable to the Incentive
Stock Options granted hereunder."

                 (v)  Other Provisions.  Each Option granted under the Plan may
                      ----------------
contain such other terms, provisions, and conditions not inconsistent with the
Plan as may be determined by the Administrator.

                (vi)  Buyout Provisions.  The Administrator may at any time
                      -----------------
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.

         (b)  SARs.
               ---- 

                 (i)  In Connection with Options.  At the sole discretion of the
                      --------------------------                                
Administrator, SARs may be granted in connection with all or any part of an
Option, either concurrently with the grant of the Option or at any time
thereafter during the term of the Option.  The following provisions apply to
SARs that are granted in connection with Options:

                      (1)  The SAR shall entitle the Optionee to exercise the 
SAR by surrendering to the Company unexercised a portion of the related Option.
The Optionee shall receive in Exchange from the Company an amount equal to the
excess of (1) the Fair Market Value on the date of exercise of the SAR of the
Common Stock covered by the surrendered portion of the related Option over (2)
the exercise price of the Common Stock covered by the surrendered portion of the
related Option. Notwithstanding the foregoing, the Administrator may place
limits on the amount that may be paid upon exercise of an SAR; provided, 
                                                               -------- 
however, that such limit shall not restrict the exercisability of the related
Option.

                      (2)  When an SAR is exercised, the related Option, to the
extent surrendered, shall cease to be exercisable.

                      (3)  An SAR shall be exercisable only when and to the
extent that the related Option is exercisable and shall expire no later than the
date on which the related Option expires.

                      (4)  An SAR may only be exercised at a time when the Fair
Market Value of the Common Stock covered by the related Option exceeds the 
exercise price of the Common Stock covered by the related Option.

                (ii)  Independent of Options.  At the sole discretion of the
                      ----------------------                                
Administrator, SARs may be granted without related Options.  The following
provisions apply to SARs that are not granted in connection with Options:

                      (1)  The SAR shall entitle the Optionee, by exercising the
SAR, to receive from the Company an amount equal to the excess of (1) the Fair
Market Value of the Common Stock covered by the exercised portion of the SAR, as
of the date of such exercise, over (2) the Fair Market Value of the Common Stock
covered by the exercised portion of the SAR, as of the last market trading date
prior to the date on which the SAR was granted; provided, however, that the
                                                --------                   
Administrator may place limits on the aggregate amount that may be paid upon
exercise of an SAR.

                      (2)  SARs shall be exercisable, in whole or in part, at 
such times as the Administrator shall specify in the Optionee's SAR Agreement.

               (iii)  Form of Payment.  The Company's obligation arising upon
                      ---------------
the exercise of an SAR may be paid in Common Stock or in cash, or in any 
combination of Common Stock and cash, as the Administrator, in its sole
discretion, may determine. Shares issued upon the exercise of an SAR shall be
valued at their Fair Market Value as of the date of exercise.

         (c)  Method of Exercise.
              ------------------ 

                 (i)  Procedure for Exercise; Rights as a Shareholder.  
                      -----------------------------------------------
Any Option or SAR granted hereunder shall be exercisable at such times and 
under such conditions as determined by the Administrator 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 or SAR 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 or SAR by the person entitled to exercise the Option or SAR
and full payment for the Shares with respect to which the Option is exercised
has been received by the Company. 
<PAGE>
 
Full payment may, as authorized by the Administrator (and, in the case of an
Incentive Stock Option, determined at the time of grant) and permitted by the
Option Agreement consist of any consideration and method of payment allowable
under subsection 5(a)(iii) of the Plan. Until the issuance (as evidenced by the
appropriate entry on the books of the Company or of a duly authorized transfer
agent of the Company) of the stock certificate evidencing such Shares, no right
to vote or receive dividends or any other rights as a shareholder shall exist
with respect to the Optioned Stock, notwithstanding the exercise of the Option.
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 10 of the Plan.

          Exercise of an Option in any manner shall result in a decrease in the
number of Shares which thereafter shall 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. Exercise of an SAR in any manner shall, to the extent the
SAR is exercised, result in a decrease in the number of Shares which thereafter
shall be available for purposes of the Plan, and the SAR shall cease to be
exercisable to the extent it has been exercised.

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

         (iii)  Termination of Employment or Consulting Relationship.  In the
                ----------------------------------------------------         
event an Optionee's Continuous Status as an Employee or Consultant terminates
(other than upon the Optionee's death or Disability), the Optionee may exercise
his or her Option or SAR, but only within such period of time as is determined
by the Administrator at the time of grant, not to exceed six (6) months (three
(3) months in the case of an Incentive Stock Option) from the date of such
termination, and only to the extent that the Optionee was entitled to exercise
it at the date of such termination (but in no event later than the expiration of
the term of such Option or SAR as set forth in the Option or SAR Agreement).  To
the extent that Optionee was not entitled to exercise an Option or SAR at the
date of such termination, and to the extent that the Optionee does not exercise
such Option or SAR (to the extent otherwise so entitled) within the time
specified herein, the Option or SAR shall terminate.

          (iv)  Disability of Optionee.  In the event an Optionee's Continuous
                ----------------------                                        
Status as an Employee or Consultant terminates as a result of the Optionee's
Disability, the Optionee may exercise his or her Option or SAR, but only within
six (6) months from the date of such termination, and only to the extent that
the Optionee was entitled to exercise it at the date of such termination (but in
no event later than the expiration of the term of such Option or SAR as set
forth in the Option or SAR Agreement).  To the extent that Optionee was not
entitled to exercise an Option or SAR at the date of such termination, and to
the extent that the Optionee does not exercise such Option or SAR (to the extent
otherwise so entitled) within the time specified herein, the Option or SAR shall
terminate.

           (v)  Death of Optionee.  Notwithstanding Sections 5(c)(iii) and
                -----------------                                         
5(c)(iv) above, in the event of an Optionee's death either (A) during Optionee's
Continuous Status as an Employee or Consultant, or (B) following termination of
Optionee's Continuous Status as an Employee or Consultant and prior to the date
on which the Option terminates pursuant to Section 5(c)(iii) or 5(c)(iv) above
and the terms of Optionee's Option or SAR, the Optionee's estate or a person who
acquired the right to exercise the deceased Optionee's Option or SAR by bequest
or inheritance may exercise the Option or SAR, but only within twelve (12)
months (or such lesser period as the Option or SAR Agreement may provide)
following the date of death, and only to the extent that the Optionee was
entitled to exercise it at the date of death (but in no event later than the
expiration of the full term of such Option or SAR as set forth in the Option or
SAR Agreement).  To the extent that Optionee was not entitled to exercise an
Option or SAR at the date of death, and to the extent that the Optionee's estate
or a person who acquired the right to exercise such Option does not exercise
such Option or SAR (to the extent otherwise so entitled) within the time
specified herein, the Option or SAR shall terminate.

     6.  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 the offeree shall be entitled to
purchase, the price to be paid, and the time within which the offeree must
accept such offer, which shall in no event exceed thirty (30) days from the date
upon which the Administrator made the determination to grant the Stock Purchase
<PAGE>
 
Right.  The offer shall be accepted by execution of a Restricted Stock Purchase
Agreement in the form determined by the Administrator.

         (b)  Repurchase Option.  Unless the Administrator determines otherwise,
              -----------------                                                 
the Restricted Stock Purchase Agreement shall grant the Company a repurchase
option exercisable upon the voluntary or involuntary termination of the
purchaser's employment with the Company for any reason (including death or
Disability).  The purchase price for Shares repurchased pursuant to the
Restricted Stock purchase agreement shall be the original price paid by the
purchaser and may be paid by cancellation of any indebtedness of the purchaser
to the Company.  The repurchase option shall lapse at such rate as the
Administrator 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)  Rule 16b-3.  Stock Purchase Rights granted to Insiders, and Shares
              ----------                                                        
purchased by Insiders in connection with Stock Purchase Rights, shall be subject
to any restrictions applicable thereto in compliance with Rule 16b-3.  An
Insider may only purchase Shares pursuant to the grant of a Stock Purchase
Right, and may only sell Shares purchased pursuant to the grant of a Stock
Purchase Right, during such time or times as are permitted by Rule 16b-3.

         (e)  Rights as a Shareholder.  Once the Stock Purchase Right is
              -----------------------                                   
exercised, the purchaser shall have the rights equivalent to those of a
shareholder, and shall be a shareholder when his or her purchase is entered upon
the records of the duly authorized transfer agent of the Company.  No adjustment
will be made for a dividend or other right for which the record date is prior to
the date the Stock Purchase Right is exercised, except as provided in Section 10
of the Plan.

     7.  Long-Term Performance Awards.
         ---------------------------- 

         (a) Administration.  Long-Term Performance Awards are cash or stock
             --------------                                                 
bonus awards that may be granted either alone or in addition to other awards
granted under the Plan.  Such awards shall be granted for no cash consideration.
The Administrator shall determine the nature, length and starting date of any
performance period (the "Performance Period") for each Long-Term Performance
Award, and shall determine the performance or employment factors, if any, to be
used in the determination of Long-Term Performance Awards and the extent to
which such Long-Term Performance Awards are valued or have been earned.  Long-
Term Performance Awards may vary from participant to participant and between
groups of participants and shall be based upon the achievement of Company,
Subsidiary, Parent and/or individual performance factors or upon such other
criteria as the Administrator may deem appropriate.  Performance Periods may
overlap and participants may participate simultaneously with respect to Long-
Term Performance Awards that are subject to different Performance Periods and
different performance factors and criteria.  Long-Term Performance Awards shall
be confirmed by, and be subject to the terms of, a Long-Term Performance Award
agreement.  The terms of such awards need not be the same with respect to each
participant.

         At the beginning of each Performance Period, the Administrator may
determine for each Long-Term Performance Award subject to such Performance
Period the range of dollar values or number of shares of Common Stock to be
awarded to the participant at the end of the Performance Period if and to the
extent that the relevant measures of performance for such Long-Term Performance
Award are met.  Such dollar values or number of shares of Common Stock may be
fixed or may vary in accordance with such performance or other criteria as may
be determined by the Administrator.

         (b)  Adjustment of Awards.  The Administrator may adjust the
              --------------------                                   
performance factors applicable to the Long-Term Performance Awards to take into
account changes in legal, accounting and tax rules and to make such adjustments
as the Administrator deems necessary or appropriate to reflect the inclusion or
exclusion of the impact of extraordinary or unusual items, events or
circumstances in order to avoid windfalls or hardships.

     8.  Administration.
         -------------- 

         (a)  Composition of Administrator.
              ---------------------------- 

              (i)  Multiple Administrative Bodies.  If permitted by Rule 16b-3
                   ------------------------------
and Applicable Laws, the Plan may (but need not) be administered by different
administrative bodies with respect to (A) Directors who are employees, (B)
Officers who are not Directors and (C) Employees who are neither Directors nor
Officers.

             (ii)  Administration with respect to Directors and Officers.  With
                   -----------------------------------------------------       
respect to grants of Options and Rights to eligible participants who are
Officers or 
<PAGE>
 
Directors of the Company, the Plan shall be administered by (A) the Board, if
the Board may administer the Plan in compliance with Rule 16b-3 as it applies to
a plan intended to qualify thereunder as a discretionary grant or award plan, or
(B) a Committee designated by the Board to administer the Plan, which Committee
shall be constituted (1) in such a manner as to permit the Plan to comply with
Rule 16b-3 as it applies to a plan intended to qualify thereunder as a
discretionary grant or award plan and (2) in such a manner as to satisfy the
Applicable Laws.

            (iii)  Administration with respect to Other Persons.  With respect
                   --------------------------------------------
to grants of Options to eligible participants who are neither Directors nor
Officers of the Company, the Plan shall be administered by (A) the Board or (B)
a Committee designated by the Board, which Committee shall be constituted in
such a manner as to satisfy the Applicable Laws.

             (iv)  General.  Once a Committee has been appointed pursuant to
                   -------                                                  
subsection (ii) or (iii) of this Section 8(a), such Committee shall continue to
serve in its designated capacity until otherwise directed by the Board.  From
time to time the Board may increase the size of any Committee and appoint
additional members thereof, remove members (with or without cause) and appoint
new members in substitution therefor, fill vacancies (however caused) and remove
all members of a Committee and thereafter directly administer the Plan, all to
the extent permitted by the Applicable Laws and, in the case of a Committee
appointed under subsection (ii), to the extent permitted by Rule 16b-3 as it
applies to a plan intended to qualify thereunder as a discretionary grant or
award plan.

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

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

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

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

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

            (vii)  to construe and interpret the terms of the Plan;

           (viii)  to prescribe, amend and rescind rules and regulations
relating to the Plan;

             (ix)  to determine whether and under what circumstances an Option
or Right may be settled in cash instead of Common Stock or Common Stock instead
of cash;
              (x)  to reduce the exercise price of any Option or Right;

             (xi)  to modify or amend each Option or Right (subject to
Section 16 of the Plan);

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

           (xiii)  to institute an Option Exchange Program;

            (xiv)  to determine the terms and restrictions applicable to 
Options and Rights and any Restricted Stock; and

             (xv)  to make all other determinations deemed necessary or
advisable for administering the Plan.
<PAGE>
 
          (c) Effect of Administrator's Decision.  The Administrator's
              ----------------------------------                      
decisions, determinations and interpretations shall be final and binding on all
Optionees and any other holders of Options or Rights.

      9.  Non-Transferability.  Options and Rights 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.

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

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

          (b) Dissolution or Liquidation.  In the event of the proposed
              --------------------------                               
dissolution or liquidation of the Company, to the extent that an Option or Right
has not been previously exercised, it will terminate immediately prior to the
consummation of such proposed action.  The Board may, in the exercise of its
sole discretion in such instances, declare that any Option or Right shall
terminate as of a date fixed by the Board and give each Optionee the right to
exercise his or her Option or Right as to all or any part of the Optioned Stock,
including Shares as to which the Option or Right would not otherwise be
exercisable.

          (c) Merger or Asset Sale.  In the event of a merger of the Company
              --------------------                                          
with or into another corporation, or the sale of substantially all of the assets
of the Company, each outstanding Option and Right shall be assumed or an
equivalent Option or Right substituted by the successor corporation or a Parent
or Subsidiary of the successor corporation.  In the event that the successor
corporation does not agree to assume the Options and Rights or to substitute
equivalent options and rights, the Administrator shall, in lieu of such
assumption or substitution, provide for the Optionee to have the right to
exercise the Option or Right as to all or a portion of the Optioned Stock,
including Shares as to which it would not otherwise be exercisable.  If the
Administrator makes an Option or Right exercisable in lieu of assumption or
substitution in the event of a merger or sale of assets, the Administrator shall
notify the Optionee that the Option or Right shall be exercisable for a period
of fifteen (15) days from the date of such notice, and the Option or Right will
terminate upon the expiration of such period.  For the purposes of this
paragraph, the Option or Right shall be considered assumed if, immediately
following the merger or sale of assets, the Option or Right confers the right to
purchase, for each Share of Optioned Stock subject to the Option or Right
immediately prior to the merger or sale of assets, the consideration (whether
stock, cash, or other securities or property) received in the merger or sale of
assets by holders of Common Stock for each Share held on the effective date of
the transaction (and if holders were offered a choice of consideration, the type
of consideration chosen by the holders of a majority of the outstanding Shares);
provided, however, that if such consideration received in the merger or sale of
- --------                                                                       
assets was not solely common stock of the successor corporation or its Parent,
the Administrator may, with the consent of the successor corporation and the
participant, provide for the consideration to be received upon the exercise of
the Option or Right, for each Share of Optioned Stock subject to the Option or
Right, to be solely common stock of the successor corporation or its Parent
equal in Fair Market Value to the per share consideration received by holders of
Common Stock in the merger or sale of assets.

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

     12.  Conditions Upon Issuance of Shares.
          ---------------------------------- 
<PAGE>
 
          (a)  Legal Compliance.  Shares shall not be issued pursuant to the
               ----------------                                             
exercise of an Option or Right unless the exercise of such Option or Right and
the issuance and delivery of such Shares 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,
Applicable Laws, and the requirements of any stock exchange or quotation system
upon which the Shares may then be listed or quoted, and shall be further subject
to the approval of counsel for the Company with respect to such compliance.

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

     13.  Liability of Company.
          -------------------- 

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

          (b)  Grants Exceeding Allotted Shares.  If the Optioned Stock covered
               --------------------------------                                
by an Option or Right exceeds, as of the date of grant, the number of Shares
which may be issued under the Plan without additional shareholder approval, such
Option or Right shall be void with respect to such excess Optioned Stock, unless
shareholder approval of an amendment sufficiently increasing the number of
Shares subject to the Plan is timely obtained in accordance with Section 16(b)
of the Plan.

     14.  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.

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

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

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

          (b)  Shareholder Approval.  The Company shall obtain shareholder
               --------------------                                       
approval of any Plan amendment to the extent necessary and desirable to comply
with Rule 16b-3 or with Section 422 of the Code (or any successor rule or
statute or other applicable law, rule or regulation, including the requirements
of any exchange or quotation system on which the Common Stock is listed or
quoted).  Such shareholder approval, if required, shall be obtained in such a
manner and to such a degree as is required by the applicable law, rule or
regulation.

          (c)  Effect of Amendment or Termination.  No amendment, alteration,
               ----------------------------------                            
suspension or termination of the Plan shall impair the rights of any Optionee,
unless mutually agreed otherwise between the Optionee and the Administrator,
which agreement must be in writing and signed by the Optionee and the Company.

     17.  Taxation Upon Exercise of Option or Right.  At the discretion of the
          -----------------------------------------                           
Administrator, Optionees may satisfy withholding obligations as provided in this
Section 17.  When an Optionee incurs tax liability in connection with an Option
or Right, which tax liability is subject to withholding under applicable tax
laws, the Optionee may satisfy the tax withholding obligation by one or some
combination of the following methods: (a) by cash payment, or (b) out of
Optionee's current compensation, or (c) by surrendering to the Company Shares
which (i) in the case of Shares previously acquired from the Company, have been
owned by the Optionee for more than six months on the date of surrender, and
(ii) have a fair market value on the date of surrender equal to or less than
Optionee's marginal tax rate times the ordinary income recognized, or (d) by
electing to have the Company withhold from the Shares to be issued upon exercise
of the Option or Right that number of Shares having a fair market value equal to
the amount required to be withheld.  For this purpose, 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").

     If the Optionee is an Insider, any surrender of previously owned Shares to
satisfy tax withholding obligations arising upon exercise of this Option must
comply with the applicable provisions of Rule 16b-3 and shall be subject to such
additional conditions or 
<PAGE>
 
restrictions as may be required thereunder to qualify for the maximum exemption
from Section 16 of the Exchange Act with respect to Plan transactions.

     All elections by an Optionee to have Shares withheld to satisfy tax
withholding obligations shall be made in writing in a form acceptable to the
Administrator and shall be subject to the following restrictions:

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

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

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

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

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

     18.  Effective Date.  The effective date of the Plan shall be the earlier
          --------------                                                      
of the date the Plan is adopted by the Board or the date the Plan is approved by
the shareholders of the Company.

     19.  Term of the Plan.  The Plan shall expire, and no further Options shall
          ----------------                                                      
be granted pursuant to the Plan, on the date that is ten years after the
effective date determined under Section 18 of this Plan.

<PAGE>
 
                                                                     EXHIBIT 4.2
                                  XIRCOM, INC.
                       1994 EMPLOYEE STOCK PURCHASE PLAN

                 As Amended and restated as of January 23, 1998


     The following constitute the provisions of the 1994 Employee Stock Purchase
Plan of Xircom, 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 Xircom, Inc.
               -------                         

          (e) "Compensation" shall mean wages, salaries, and fees for
               ------------                                          
professional services and any other amounts received (without regard to whether
or not an amount is paid in cash) for personal services actually rendered in the
course of employment with the Company to the extent that such amounts are
included in gross income (including, but not limited to, commissions paid
salesmen, compensation for services on the basis of a percentage of profits,
bonuses, fringe benefits, reimbursements and expense allowances), and excluding
the following:

              (1)  Company contributions to a plan of deferred compensation 
which are not included in the Employee's gross income for the taxable year in
which contributed, or Company contributions under a simplified employee pension
plan to the extent such contributions are deductible by the Employee, or any
distributions from a plan of deferred compensation;

              (2)  Amounts realized from the exercise of a non-qualified stock
option, or when restricted stock (or property) held by the Employee either
becomes freely transferable or is no longer subject to a substantial risk of
forfeiture; and

              (3)  Amounts realized from the sale, exchange or other disposition
of stock acquired under a qualified stock option.

          (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 or any Designated Subsidiary for purposes of tax withholding under the
Code whose customary employment with the Company or any Designated Subsidiary 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
               ---------------                                                  
or Extended Offering Period.

          (i) "Exercise Date" shall mean the last day of each Offering Period,
               -------------                                                  
or with respect to an Extended Offering Period, the last day of each Purchase
Period.
<PAGE>
 
          (j)  "Extended Offering Period" shall mean a period of not more than
                ------------------------                                      
approximately twelve (12) months, commencing on the date or dates so specified
by the Board, during which options granted pursuant to the Plan may be
exercised.  The duration, commencement and termination of Extended Offering
Periods may be changed pursuant to Section 4 of this Plan.

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

          (1) If the Common Stock is listed on any established stock exchange or
a national market system, including without limitation the National Market
System 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 System 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) 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.

          (l) "Offering Period" shall mean a period of approximately six (6)
               ---------------                                              
months, commencing on a date determined by the Board, during which an option
granted pursuant to the Plan may be exercised.  The duration, commencement and
termination of Offering Periods may be changed pursuant to Section 4 of this
Plan.

          (m) "Plan" shall mean this 1994 Employee Stock Purchase Plan.
               ----                                                    

          (n) "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.

          (o) "Purchase Period" shall mean, with respect to an Extended Offering
               ---------------                                                  
Period, the approximately six (6) month period commencing after one Exercise
Date and ending with the next Exercise Date, except that the first Purchase
Period of any Extended Offering Period shall commence on the Enrollment Date and
end with the next Exercise Date.  The duration, commencement and termination of
Purchase Periods may be changed pursuant to Section 4 of this Plan.

          (p) "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.

          (q) "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.

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

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

          (b) Any provisions of the Plan to the contrary notwithstanding, no
Employee shall be granted an option under the Plan (i) to the extent,
immediately after the grant, such Employee (or any other person whose stock
would be attributed to such Employee pursuant to Section 424(d) of the Code)
would own capital stock of the Company and/or hold outstanding options to
purchase such stock possessing five percent (5%) or more of the total combined
voting power or value of all classes of the capital stock of the Company or of
any Subsidiary, or (ii) to the extent his or her rights to purchase stock under
all "employee stock purchase plans" qualified under Section 423 of the Code 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 and Extended Offering Periods.  The Plan shall be
          ----------------------------------------------                    
implemented by Offering Periods and/or Extended Offering Periods which may be
consecutive and/or overlapping, as determined by the Board, commencing on such
dates as the Board 
<PAGE>
 
shall determine, and continuing thereafter until terminated in accordance with
Section 19 hereof. Except as noted in the next sentence, the Board shall have
the power to change the duration, commencement and termination of Offering
Periods, Extended Offering Periods and/or Purchase Periods with respect to
future offerings without shareholder approval if such change is announced at
least five (5) days prior to the scheduled beginning of the first Offering
Period, Extended Offering Period or Purchase Period to be affected thereafter.
No such change may result in any Offering Period, Extended Offering Period or
Purchase Period exceeding twelve (12) months in duration without the prior
approval of the shareholders of the Company. Unless otherwise provided by the
Board, the first Offering Period under the Plan shall commence on the first
business day on or after April 1, 1994 and terminate on the last business day in
the period ending September 30, and shall continue with successive Offering
Periods 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 Stock Plan
Administrator 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 in an amount not exceeding
ten percent (10%) of the Compensation which he or she receives during the
Offering Period or Extended Offering Period, (or such lesser percentage as may
be determined by the Board at least five days prior to the beginning of an
Offering Period or Extended Offering Period).  Deductions shall be made in the
applicable percentage on each pay day, and on any other payment date for
Compensation paid to the participant, during the Offering Period or Extended
Offering Period.

          (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 or Extended 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 or Extended
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 or Extended 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 Offering
Period or Extended Offering Period which is scheduled to end during the current
calendar year (the "Current Offering Period or Extended Offering Period") that
the aggregate of all payroll deductions which were previously used to purchase
stock under the Plan in a prior Offering Period or Extended Offering Period
which ended during that calendar year plus all payroll deductions accumulated
with respect to the Current Offering Period or Extended Offering Period equal
$21,250.  Payroll deductions shall recommence at the rate provided in such
participant' s subscription agreement at the beginning of the first Offering
Period or Extended Offering 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.
<PAGE>
 
     7.   Grant of Option.  On the Enrollment Date of each Offering Period or
          ---------------                                                    
Extended Offering Period, each eligible Employee participating in such Offering
Period or Extended Offering Period shall be granted an option to purchase on the
Exercise Date(s) of such Offering Period or Extended 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 any Offering Period or Extended
Offering an amount in excess of the amount then permitted under Code Section
423(b)(8). 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 or Extended Offering Period.

     8.   Exercise of Option.  Unless a participant withdraws from the Plan as
          ------------------                                                  
provided in Section 10 hereof, his or her option for the purchase of shares 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
Offering Period or Extended Offering Period, subject to earlier withdrawal by
the participant as provided in Section 10 hereof.  Any other moneys 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 or Extended Offering Period will be automatically terminated, and no
further payroll deductions for the purchase of shares

will be made during the Offering Period or Extended Offering Period or Extended
Offering Period.  If a participant withdraws from an Offering Period or Extended
Offering Period, payroll deductions will not resume at the beginning of the
succeeding Offering Period or Extended 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 or Extended 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 or

Extended 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.

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

     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 six hundred thousand
(600,000) 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.
<PAGE>
 
          (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.
          -------------- 

          (a) Administrative Body.  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.

          (b) Rule 16b-3 Limitations.  Notwithstanding the provisions of
              ----------------------                                    
Subsection (a) of this Section 13, in the event that Rule 16b-3 promulgated
under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or
any successor provision ("Rule 16b-3") provides specific requirements for the
administrators of plans of this type, the Plan shall be only administered by
such a body and in such a manner as shall comply with the applicable
requirements of Rule 16b-3. Unless permitted by Rule 16b-3, no discretion
concerning decisions regarding the Plan shall be afforded to any committee or
person that is not "disinterested" as that term is used in Rule 16b-3.

     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 or Extended Offering Period in accordance with
Section 10 hereof.

     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.
          ------------------------------------------ 

          (a) Changes in Capitalization.  Subject to any required action by the
              -------------------------                                        
shareholders 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 
<PAGE>
 
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 Period or Extended
Offering Period 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 the successor
corporation refuses to assume or substitute for the option, the Board shall, in
lieu of such assumption or substitution,  shorten the Offering Period(s) or
Extended Offering Period(s) then in progress by setting a new Exercise Date (the
"New Exercise Date") to a date which is prior to the effective date of any such
sale or merger, and the Offering Period and the Plan shall terminate immediately
after the New Exercise Date.  If the Board shortens the Offering Period(s) or
Extended Offering Period(s) then in progress in lieu of assumption or
substitution in the event of a merger or sale of assets, 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
Period(s) or Extended Offering Period(s) as provided in Section 10 hereof.  For
purposes of this paragraph, an option granted under the Plan shall be deemed to
be assumed if, following the sale of assets or merger, the option confers the
right to purchase, for each share of option stock subject to the option
immediately prior to the sale of assets or merger, the consideration (whether
stock, cash or other securities or property) received in the sale of assets or
merger by holders of Common Stock for each share of Common Stock held on the
effective date of the transaction (and if such holders were offered a choice of
consideration, the type of consideration chosen by the holders of a majority of
the outstanding shares of Common Stock); provided, however, that if such
consideration received in the sale of assets or merger was not solely common
stock of the successor corporation or its parent (as defined in Section 424(e)
of the Code), the Board may, with the consent of the successor corporation,
provide for the consideration to be received upon exercise of the option to be
solely common stock of the successor corporation or its parent equal in fair
market value to the per share consideration received by holders of Common Stock
and the sale of assets or merger.

     19.  Amendment or Termination.
          ------------------------ 

          (a) Except as noted below in this Section 19 (a), the Board of
Directors of the Company may at any time and for any reason terminate or amend
the Plan.  No such amendment may result in any Offering Period, Extended
Offering Period or Purchase Period exceeding twelve (12) months in duration
without the prior approval of the shareholders of the Company.   Except as
provided in Section 18 hereof, no such termination can affect options previously
granted, provided that an Offering Period or Extended Offering Period may be
terminated by the Board of Directors on any Exercise Date if the Board
determines that the termination of the Plan is in the best interests of the
Company and its shareholders.  Except as provided in Section 18 hereof, no
amendment may make any change in any option there to fore 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 shareholder approval in such a manner and to such a degree as required.

          (b) Except as noted below in this Section 19(b), without shareholder
consent and without regard to whether any participant rights may be considered
to have been "adversely affected," the Board (or its committee) shall be
entitled to change the Offering Periods or Extended Offering Periods, limit the
frequency and/or number of changes in the amount withheld during an Offering
Period or Extended 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. Notwithstanding the
foregoing, no such change may result in any Offering 
<PAGE>
 
Period, Extended Offering Period or Purchase Period exceeding twelve (12) months
in duration without the prior approval of the shareholders of the Company.

     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 Securities Exchange Act of 1934, as
amended, the rules and regulations promulgated thereunder, and the requirements
of any stock exchange upon which the shares may then be listed, and shall be
further subject to the approval of counsel for the Company with respect to such
compliance.

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

     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
shareholders of the Company.  It shall continue in effect for a term of ten (10)
years unless sooner terminated under Section 19 hereof.
<PAGE>
 
                                   Exhibit A
                                   ---------

                                  XIRCOM, INC.
                       1994 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 Xircom, Inc. 1994 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 (not to exceed 10%) during the
     Offering Period or Extended 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 or Extended
     Offering Period, any accumulated payroll deductions will be used to
     automatically exercise my option.

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

5.   Shares purchased for me under the Employee Stock Purchase Plan should be
     issued in the name(s) of (Employee or Employee and Spouse as Joint Tenants
     with Rights of Survivorship only):

     __________________________________________________.

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

Beneficiary name/address:
 
 
Relationship
<PAGE>
 
Beneficiary name/address:  
                           --------------------------------------
 
Relationship               
                           -------------------------------------- 

Employee's Social
                           --------------------------------------

Security Number:
                           --------------------------------------

Employee's Address:
                           --------------------------------------
                           
                           -------------------------------------- 

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



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



Dated:                        ------------------------------------------
       -------------          Print Employee's Name (Last, First)


                              ------------------------------------------ 
                              Signature of Employee


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

<PAGE>
 
                                   Exhibit B
                                   ---------

                                  XIRCOM, INC.
                       1994 EMPLOYEE STOCK PURCHASE PLAN

                              NOTICE OF WITHDRAWAL

     The undersigned participant in the Offering Period or Extended Offering
Period of the Xircom, Inc. 1994 Employee Stock Purchase Plan which began on
__________________ 199___ (the "Enrollment Date") hereby notifies the Company
that he or she hereby withdraws from the Offering Period or Extended 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 or Extended Offering Period.  The
undersigned understands and agrees that his or her option for such Offering
Period or Extended 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 or Extended Offering
Period and the undersigned shall be eligible to participate in succeeding
Offering Periods or Extended Offering Periods only by delivering to the Company
a new Subscription Agreement.


          Name and Address of Participant:  ____________________________________
                                                
                                            ____________________________________

                                            ____________________________________
 
Signature:                                  ____________________________________

Date:                                       ____________________________________


 


<PAGE>
 
                                                                     EXHIBIT 4.3
                                                                               
                                  XIRCOM, INC.
                             1995 STOCK OPTION PLAN

                  As amended and restated on October 24, 1997

    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, and

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

        .  Options granted under the Plan will be Nonstatutory Stock Options.

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

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

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

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

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

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

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

        (g) "Company" means Xircom, Inc., a California corporation.
             -------                                               

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

        (i) "Director" means a member of the Board.
             --------                              

        (j) "Disability" means total and permanent disability as defined in
             ----------                                                    
Section 22(e)(3) of the Code.

        (k) "Employee" means any person employed by the Company or any Parent or
             --------                                                           
Subsidiary of the Company.  A Service Provider shall not cease to be an Employee
in the case of (i) any leave of absence approved by the Company or (ii)
transfers between locations of the Company or between the Company, its Parent,
any Subsidiary, or any successor.  Neither service as a Director nor payment of
a director's fee by the Company shall be sufficient to constitute "employment"
by the Company.

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

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

          (i) If the Common Stock is listed on any established stock exchange or
a national market system, including without limitation the Nasdaq National
Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, the Fair Market
Value of a share of Common Stock shall be the closing sales price for such stock
(or the closing bid, if no sales were reported) as quoted on such exchange or
system on the day of determination (or, if the day of determination is not a
market trading day, then on the last market trading 
<PAGE>
 
day prior to 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 regularly quoted by a recognized
securities dealer but selling prices are not reported, the Fair Market Value of
a Share of Common Stock shall be the mean between the high bid and low asked
prices for the Common Stock on the day of determination (or, if the day of
determination is not a market trading day, then on the last market trading day
prior to the day of determination), as reported in The Wall Street Journal or
such other source as the Administrator deems reliable;

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

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

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

        (p)  "Option" means a nonstatutory stock option granted pursuant to the
              ------                                                           
Plan, that is not intended to qualify as an incentive stock option within the
meaning of Section 422 of the Code and the regulations promulgated thereunder.

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

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

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

        (t)  "Optionee" means the holder of an outstanding Option granted under
              --------                                                         
the Plan.

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

        (v)  "Plan" means this 1998 Nonstatutory Stock Plan.
              ----                                          

        (w)  "Service Provider" means an Employee including an Officer, 
              ----------------                                         
Consultant or Director.

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

        (y)  "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 12 of
        -------------------------                                             
the Plan, the maximum aggregate number of Shares which may be optioned and sold
under the Plan is 549,857 Shares.  The Shares may be authorized, but unissued,
or reacquired Common Stock.

        If an Option expires or becomes unexercisable without having been
exercised in full, or is surrendered pursuant to an Option Exchange Program, the
unpurchased Shares which were subject thereto shall become available for future
grant or sale under the Plan (unless the Plan has terminated).

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

        (a) Administration.  The Plan shall be administered by (i) the Board or
            --------------                                                     
(ii) a Committee, which committee shall be constituted to satisfy Applicable
Laws.

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

            (i) to determine the Fair Market Value of the Common Stock;

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

            (vii)  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;

            (viii) to institute an Option Exchange Program;

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

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

            (xi)   to modify or amend each Option (subject to Section 14(b) of
the Plan), including the discretionary authority to extend the post-termination
exercisability period of Options longer than is otherwise provided for in the
Plan;

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

            (xiii) to determine the terms and restrictions applicable to
Options;

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

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

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

    5.  Eligibility.  Options may be granted to Service Providers; provided,
        -----------                                                         
however, that notwithstanding anything to the contrary contained in the Plan,
Options may not be granted to Officers and Directors.

    6.  Limitation.  Neither the Plan nor any Option shall confer upon an
        ----------                                                       
Optionee any right with respect to continuing the Optionee's relationship as a
Service Provider with the Company, nor shall they interfere in any way with the
Optionee's right or the Company's right to terminate such relationship at any
time, with or without cause.

    7.  Term of Plan.  The Plan shall become effective upon its adoption by the
        ------------                                                           
Board.  It shall continue in effect for ten (10) years, unless sooner terminated
under Section 14 of the Plan.

    8.  Term of Option.  The term of each Option shall be stated in the Option
        --------------                                                        
Agreement.

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

        (a) Exercise Price.  The per share exercise price for the Shares to be
            --------------                                                    
issued pursuant to exercise of an Option shall be determined by the
Administrator.
<PAGE>
 
        (b) Waiting Period and Exercise Dates.  At the time an Option is
            ---------------------------------                           
granted, the Administrator shall fix the period within which the Option may be
exercised and shall determine any conditions which must be satisfied before the
Option may be exercised.

        (c) Form of Consideration.  The Administrator shall determine the
            ---------------------                                        
acceptable form of consideration for exercising an Option, including the method
of payment.  In making its determination as to the type of consideration to
accept, the Administrator shall consider if acceptance of such consideration may
be reasonably expected to benefit the Company.  Such consideration may consist
entirely of:

            (i)   cash;

            (ii)  check;

            (iii) promissory note;

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

            (v)   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;

            (vi)  such other consideration and method of payment for the
issuance of Shares to the extent permitted by Applicable Laws; or

            (vii) any combination of the foregoing methods of payment.

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

         (a) Procedure for Exercise; Rights as a Shareholder. Any Option granted
             -----------------------------------------------                    
hereunder shall be exercisable according to the terms of the Plan and at such
times and under such conditions as determined by the Administrator and set forth
in the Option Agreement.  An Option may not be exercised for a fraction of a
Share.

             An Option shall be deemed exercised when the Company receives: (i)
written or electronic notice of exercise (in accordance with the Option
Agreement) from the person entitled to exercise the Option, and (ii) full
payment for the Shares with respect to which the Option is exercised. Full
payment may consist of any consideration and method of payment authorized by the
Administrator and permitted by the Option Agreement and the Plan. Shares issued
upon exercise of an Option shall be issued in the name of the Optionee or, if
requested by the Optionee, in the name of the Optionee and his or her spouse.
Until the Shares are issued (as evidenced by the appropriate entry on the books
of the Company or of a duly authorized transfer agent of the Company), no right
to vote or receive dividends or any other rights as a shareholder shall exist
with respect to the Optioned Stock, notwithstanding the exercise of the Option.
The Company shall issue (or cause to be issued) such Shares promptly after the
Option is exercised. No adjustment will be made for a dividend or other right
for which the record date is prior to the date the Shares are issued, except as
provided in Section 12 of the Plan.

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

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

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

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

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

    11.  Non-Transferability of Options .  Unless determined otherwise by the
         -------------------------------                                     
Administrator, an 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.  If the Administrator makes an Option
transferable, such Option shall contain such additional terms and conditions as
the Administrator deems appropriate.

    12.  Adjustments Upon Changes in Capitalization, Dissolution, Merger or 
         ------------------------------------------------------------------
         Asset Sale.
         ----------
         (a) Changes in Capitalization.  Subject to any required action by the
             -------------------------                                        
shareholders of the Company, the number of shares of Common Stock covered by
each outstanding Option, and the number of shares of Common Stock which have
been authorized for issuance under the Plan but as to which no Options have yet
been granted or which have been returned to the Plan upon cancellation or
expiration of an Option, as well as the price per share of Common Stock covered
by each such outstanding Option, shall be proportionately adjusted for any
increase or decrease in the number of issued shares of Common Stock resulting
from a stock split, reverse stock split, stock dividend, combination or
reclassification of the Common Stock, or any other increase or decrease in the
number of issued shares of Common Stock effected without receipt of
consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration."  Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of 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 Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction.  The Administrator in its discretion may provide for an Optionee to
have the right to exercise his or her Option until ten (10) days prior to such
transaction as to all of the Optioned Stock covered thereby, including Shares as
to which the Option would not otherwise be exercisable.  In addition, the
Administrator may provide that any Company repurchase option applicable to any
Shares purchased upon exercise of an Option shall lapse as to all such Shares,
provided the proposed dissolution or liquidation takes place at the time and in
the manner contemplated.  To the extent it has not been previously exercised, an
Option will terminate immediately prior to the consummation of such proposed
action.

        (c) Merger or Asset Sale.  In the event of a merger of the Company with
            --------------------                                               
or into another corporation, or the sale of substantially all of the assets of
the Company, each outstanding Option shall be assumed or an equivalent option or
right substituted by the successor corporation or a Parent or Subsidiary of the
successor corporation.  In the event that the successor corporation refuses to
assume or substitute for the Option, the Optionee shall fully vest in and have
the right to exercise the Option as to all of the Optioned Stock, including
Shares as to which it would not otherwise be vested or exercisable.  If an
Option becomes fully vested and 
<PAGE>
 
exercisable in lieu of assumption or substitution in the event of a merger or
sale of assets, the Administrator shall notify the Optionee in writing or
electronically that the Option shall be fully vested and exercisable for a
period of fifteen (15) days from the date of such notice, and the Option shall
terminate upon the expiration of such period. For the purposes of this
paragraph, the Option shall be considered assumed if, following the merger or
sale of assets, the option or right confers the right to purchase or receive,
for each Share of Optioned Stock, immediately prior to the merger or sale of
assets, the consideration (whether stock, cash, or other securities or property)
received in the merger or sale of assets by holders of Common Stock for each
Share held on the effective date of the transaction (and if holders were offered
a choice of consideration, the type of consideration chosen by the holders of a
majority of the outstanding Shares); provided, however, that if such
consideration received in the merger or sale of assets is not solely common
stock of the successor corporation or its Parent, the Administrator may, with
the consent of the successor corporation, provide for the consideration to be
received upon the exercise of the Option, for each Share of Optioned Stock to be
solely common stock of the successor corporation or its Parent equal in fair
market value to the per share consideration received by holders of Common Stock
in the merger or sale of assets.

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

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

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

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

    15.  Conditions Upon Issuance of Shares.
         ---------------------------------- 

         (a) Legal Compliance.  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 shall comply with Applicable Laws and shall be further
subject to the approval of counsel for the Company with respect to such
compliance.

         (b) Investment Representations.  As a condition to the exercise of an
             --------------------------                                       
Option 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.

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

    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.

<PAGE>
 
                                                                     EXHIBIT 4.4
                                  XIRCOM, INC.
                      1997 PATENT AWARD STOCK OPTION PLAN


                             Adopted July 25, 1997


    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

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

        .   Options granted under the Plan will be Nonstatutory Stock Options.

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

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

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

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

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

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

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

        (g) "Company" means Xircom, Inc., a California corporation.
             -------                                               

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

        (i) "Director" means a member of the Board.
             --------                              

        (j) "Disability" means total and permanent disability as defined in
             ----------                                                    
Section 22(e)(3) of the Code.

        (k) "Employee" means any person, including Officers, employed by the
             --------                                                       
Company or any Parent or Subsidiary of the Company.  A Service Provider shall
not cease to be an Employee in the case of (i) any leave of absence approved by
the Company or (ii) transfers between locations of the Company or between the
Company, its Parent, any Subsidiary, or any successor.  Neither service as a
Director nor payment of a director's fee by the Company shall be sufficient to
constitute "employment" by the Company.

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

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

            (i) If the Common Stock is listed on any established stock exchange
or a national market system, including without limitation the Nasdaq National
Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its Fair Market
Value shall be the closing sales price for such stock (or the closing bid, if no
sales were reported) as quoted on such exchange or system on the day of
determination (or, if the day of determination is not a market trading day, then
on the last market trading day prior to the day of determination), as reported
in The Wall Street Journal or such other source as the Administrator deems
reliable;
<PAGE>
 
            (ii) If the Common Stock is regularly quoted by a recognized
securities dealer but selling prices are not reported, the Fair Market Value of
a Share of Common Stock shall be the mean between the high bid and low asked
prices for the Common Stock on the day of determination (or, if the day of
determination is not a market trading day, then on the last market trading day
prior to the day of determination), as reported in The Wall Street Journal or
such other source as the Administrator deems reliable;

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

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

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

        (p) "Option" means a nonstatutory stock option granted pursuant to the
             ------                                                           
Plan, that is not intended to qualify as an incentive stock option within the
meaning of Section 422 of the Code and the regulations promulgated thereunder.

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

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

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

        (t) "Optionee" means the holder of an outstanding Option granted under
             --------                                                         
the Plan.

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

        (v) "Plan" means this Patent Award Stock Option Plan.
             ----                                            

        (w) "Service Provider" means an Employee including an Officer,
             ----------------                                         
Consultant or Director.

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

        (y) "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 12 of
        -------------------------                                             
the Plan, the maximum aggregate number of Shares which may be optioned and sold
under the Plan is 250,000 Shares.  The Shares may be authorized, but unissued,
or reacquired Common Stock.

        If an Option expires or becomes unexercisable without having been
exercised in full, or is surrendered pursuant to an Option Exchange Program, the
unpurchased Shares which were subject thereto shall become available for future
grant or sale under the Plan (unless the Plan has terminated).

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

        (a) Administration.  The Plan shall be administered by (i) the Board or
            --------------                                                     
(ii) a Committee, which committee shall be constituted to satisfy Applicable
Laws.

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

            (i)   to determine the Fair Market Value of the Common Stock;

            (ii)  to select the Service Providers to whom Options may be granted
hereunder;

            (iii) to determine whether and to what extent Options are granted
hereunder;
<PAGE>
 
            (iv)   to determine the number of shares of Common Stock to be
covered by each Option 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. Such terms and conditions
include, but are not limited to, the exercise price, the time or times when
Options may be exercised (which may be based on performance criteria), any
vesting acceleration or waiver of forfeiture restrictions, and any restriction
or limitation regarding any Option or the shares of Common Stock relating
thereto, based in each case on such factors as the Administrator, in its sole
discretion, shall determine;

            (vii)  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;

            (viii) to institute an Option Exchange Program;

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

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

            (xi)   to modify or amend each Option (subject to Section 14(b) of
the Plan), including the discretionary authority to extend the post-termination
exercisability period of Options longer than is otherwise provided for in the
Plan;

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

            (xiii) to determine the terms and restrictions applicable to
Options;

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

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

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

    5.  Eligibility.  Options may be granted to Service Providers; provided,
        -----------                                                         
however, that notwithstanding anything to the contrary contained in the Plan,
Options may not be granted to Officers and Directors.

    6.  Limitation.  Neither the Plan nor any Option shall confer upon an
        ----------                                                       
Optionee any right with respect to continuing the Optionee's relationship as a
Service Provider with the Company, nor shall they interfere in any way with the
Optionee's right or the Company's right to terminate such relationship at any
time, with or without cause.

    7.  Term of Plan.  The Plan shall become effective upon its adoption by the
        ------------                                                           
Board.  It shall continue in effect for ten (10) years, unless sooner terminated
under Section 14 of the Plan.

    8.  Term of Option.  The term of each Option shall be stated in the Option
        --------------                                                        
Agreement.

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

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

        (b) Waiting Period and Exercise Dates.  At the time an Option is
            ---------------------------------                           
granted, the Administrator shall fix the period within which the Option may be
exercised and shall determine any conditions which must be satisfied before the
Option may be exercised.
<PAGE>
 
        (c) Form of Consideration.  The Administrator shall determine the
            ---------------------                                        
acceptable form of consideration for exercising an Option, including the method
of payment.  Such consideration may consist entirely of:

            (i)     cash;

            (ii)    check;

            (iii)   promissory note;

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

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

            (vii)   such other consideration and method of payment for the
issuance of Shares to the extent permitted by Applicable Laws; or

            (viii)  any combination of the foregoing methods of payment.

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

         (a) Procedure for Exercise; Rights as a Shareholder. Any Option granted
             -----------------------------------------------                    
hereunder shall be exercisable according to the terms of the Plan and at such
times and under such conditions as determined by the Administrator and set forth
in the Option Agreement.  An Option may not be exercised for a fraction of a
Share.

             An Option shall be deemed exercised when the Company receives: (i)
written or electronic notice of exercise (in accordance with the Option
Agreement) from the person entitled to exercise the Option, and (ii) full
payment for the Shares with respect to which the Option is exercised.  Full
payment may consist of any consideration and method of payment authorized by the
Administrator and permitted by the Option Agreement and the Plan.  Shares issued
upon exercise of an Option shall be issued in the name of the Optionee or, if
requested by the Optionee, in the name of the Optionee and his or her spouse.
Until the Shares are issued (as evidenced by the appropriate entry on the books
of the Company or of a duly authorized transfer agent of the Company), no right
to vote or receive dividends or any other rights as a shareholder shall exist
with respect to the Optioned Stock, notwithstanding the exercise of the Option.
The Company shall issue (or cause to be issued) such Shares promptly after the
Option is exercised.  No adjustment will be made for a dividend or other right
for which the record date is prior to the date the Shares are issued, except as
provided in Section 12 of the Plan.

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

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

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

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

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

    11.  Non-Transferability of Options .  Unless determined otherwise by the
         -------------------------------                                     
Administrator, an 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.  If the Administrator makes an Option
transferable, such Option shall contain such additional terms and conditions as
the Administrator deems appropriate.

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

         (a) Changes in Capitalization.  Subject to any required action by the
             -------------------------                                        
shareholders of the Company, the number of shares of Common Stock covered by
each outstanding Option, and the number of shares of Common Stock which have
been authorized for issuance under the Plan but as to which no Options have yet
been granted or which have been returned to the Plan upon cancellation or
expiration of an Option, as well as the price per share of Common Stock covered
by each such outstanding Option, shall be proportionately adjusted for any
increase or decrease in the number of issued shares of Common Stock resulting
from a stock split, reverse stock split, stock dividend, combination or
reclassification of the Common Stock, or any other increase or decrease in the
number of issued shares of Common Stock effected without receipt of
consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration."  Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of 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 Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction.  The Administrator in its discretion may provide for an Optionee to
have the right to exercise his or her Option until ten (10) days prior to such
transaction as to all of the Optioned Stock covered thereby, including Shares as
to which the Option would not otherwise be exercisable.  In addition, the
Administrator may provide that any Company repurchase option applicable to any
Shares purchased upon exercise of an Option shall lapse as to all such Shares,
provided the proposed dissolution or liquidation takes place at the time and in
the manner contemplated.  To the extent it has not been previously exercised, an
Option will terminate immediately prior to the consummation of such proposed
action.

         (c) Merger or Asset Sale.  In the event of a merger of the Company with
             --------------------                                               
or into another corporation, or the sale of substantially all of the assets of
the Company, each outstanding Option shall be assumed or an equivalent option or
right substituted by the successor corporation or a Parent or Subsidiary of the
successor corporation.  In the event that the successor corporation refuses to
assume or substitute for the Option, the Optionee shall fully vest in and have
the right to exercise the Option as to all of the Optioned Stock, including
Shares as to which it would not otherwise be vested or exercisable.  If an
Option becomes fully vested and exercisable in lieu of assumption or
substitution in the event of a merger or sale of assets, the Administrator shall
notify the Optionee in writing or electronically that the Option shall be fully
vested and exercisable for a period of fifteen (15) days from the date of such
notice, and the Option shall terminate upon the expiration of such period.  For
the purposes of this paragraph, the Option shall be considered assumed if,
following the merger or sale of assets, the option or right confers the right to
purchase or receive, for each Share of Optioned Stock, immediately prior to the
merger or sale of assets, the consideration (whether stock, cash, or other
securities or property) received in the merger or sale of assets by 
<PAGE>
 
holders of Common Stock for each Share held on the effective date of the
transaction (and if holders were offered a choice of consideration, the type of
consideration chosen by the holders of a majority of the outstanding Shares);
provided, however, that if such consideration received in the merger or sale of
assets is not solely common stock of the successor corporation or its Parent,
the Administrator may, with the consent of the successor corporation, provide
for the consideration to be received upon the exercise of the Option, for each
Share of Optioned Stock to be solely common stock of the successor corporation
or its Parent equal in fair market value to the per share consideration received
by holders of Common Stock in the merger or sale of assets.

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

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

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

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

    15.  Conditions Upon Issuance of Shares.
         ---------------------------------- 

         (a) Legal Compliance.  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 shall comply with Applicable Laws and shall be further
subject to the approval of counsel for the Company with respect to such
compliance.

         (b) Investment Representations.  As a condition to the exercise of an
             --------------------------                                       
Option 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.

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

    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.

<PAGE>
 
                                                                     EXHIBIT 5.1



                                April 21, 1998


Xircom, Inc.
2300 Corporate Center Drive
Thousand Oaks, California 91320

               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 21,
1998 (the "Registration Statement") in connection with the registration under
the Securities Act of 1933, as amended (the "Act"), of 900,000 shares of your
Common Stock issuable under your 1992 Stock Option Plan, 200,000 shares of your
Common Stock issuable under your 1994 Employee Stock Purchase Plan, 300,000
shares of your Common Stock issuable under your 1995 Stock Option Plan and
250,000 shares of your Common Stock issuable under your 1997 Patent Award Stock
Option Plan. Such shares of Common Stock are referred to herein as the "Shares"
and the 1992 Stock Option Plan, the 1994 Employee Stock Purchase Plan, the 1995
Stock Option Plan and the 1997 Patent Award Stock Option Plan are collectively
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

<PAGE>
 
                                                                    EXHIBIT 23.1


              CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


   We consent to the incorporation by reference in the Registration Statement
(Form S-8) pertaining to the 1992 Stock Option Plan, the 1994 Employee Stock
Purchase Plan, the 1995 Stock Option Plan, and the 1997 Patent Award Stock
Option Plan of Xircom, Inc. of our report dated October 20, 1997, with respect
to the consolidated financial statements and schedule of Xircom, Inc. included
in its Annual Report (Form 10-K) for the year ended September 30, 1997, filed
with the Securities and Exchange Commission.


                  ERNST & YOUNG LLP

Woodland Hills, California
April 21, 1998


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