DALLAS SEMICONDUCTOR CORP
S-8, 1999-08-17
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>   1
================================================================================

    As filed with the Securities and Exchange Commission on August 17, 1999
                                                       Registration No. 333- ___


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

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

                             -----------------------
                        DALLAS SEMICONDUCTOR CORPORATION
             (Exact name of registrant as specified in its charter)

          DELAWARE                                              75-1935715
(State or other jurisdiction of                               (I.R.S. Employer
incorporation or organization)                               Identification No.)

                           4401 SOUTH BELTWOOD PARKWAY
                            DALLAS, TEXAS 75244-3292
                                 (972) 371-4000
               (Address, including ZIP code, and telephone number,
        including area code, of registrant's principal executive offices)

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

                        DALLAS SEMICONDUCTOR CORPORATION
                             1987 STOCK OPTION PLAN
                   1993 OFFICER AND DIRECTOR STOCK OPTION PLAN
                            (Full title of the plan)

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

             C.V. PROTHRO                                  Copy to:
        CHAIRMAN OF THE BOARD,                        M.D. SAMPELS, ESQ.
  PRESIDENT & CHIEF EXECUTIVE OFFICER              JENKENS & GILCHRIST, P.C.
   DALLAS SEMICONDUCTOR CORPORATION              1445 ROSS AVENUE, SUITE 3200
      4401 SOUTH BELTWOOD PARKWAY                  DALLAS, TEXAS  75202-2799
       DALLAS, TEXAS  75244-3292                        (214) 855-4500
(Name and address of agent for service)

            (972) 371-4000
     (Telephone number, including
   area code, of agent for service)


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

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
=======================================================================================================================
                                                              PROPOSED                  PROPOSED
         TITLE OF                                              MAXIMUM                   MAXIMUM
        SECURITIES                   AMOUNT                   OFFERING                  AGGREGATE           AMOUNT OF
           TO BE                     TO BE                      PRICE                   OFFERING          REGISTRATION
        REGISTERED             REGISTERED (1) (2)         PER SHARE (3)(4)            PRICE (3)(4)           FEE (4)
- -----------------------------------------------------------------------------------------------------------------------
<S>                            <C>                        <C>                        <C>                 <C>
Common Stock, $0.02
par value per share             1,115,462 shares              $ 48.1563               $ 53,716,523           $14,933
=======================================================================================================================
</TABLE>

(1)      The securities to be registered include an aggregate of 1,115,462
         shares reserved for issuance under the Dallas Semiconductor Corporation
         1987 Stock Option Plan and 1993 Officer and Director Stock Option Plan
         (the "Plans").

(2)      Pursuant to Rule 416, this Registration Statement also covers such
         additional shares as may hereinafter be offered or issued to prevent
         dilution resulting from stock splits, stock dividends,
         recapitalizations or certain other capital adjustments.

(3)      Estimated solely for purpose of calculating the registration fee.

(4)      Calculated pursuant to Rule 457(c) and 457(h) under the Securities Act
         of 1933, as amended (the "Securities Act"). Accordingly, the price per
         share of common stock offered hereunder pursuant to the Plans is based
         on (i) 1,115,462 shares reserved for issuance under the Plans at a
         price per share of $48.1563, which is the average of the high and low
         prices of the common stock reported on the New York Stock Exchange on
         August 10, 1999, which is a date within five business days prior to the
         date of filing this Registration Statement.

================================================================================

<PAGE>   2


                                     PART I

ITEM 1.  PLAN INFORMATION*

ITEM 2.  REGISTRANT INFORMATION AND EMPLOYEE PLAN ANNUAL INFORMATION*

*Information required by Part I of Form S-8 (Items 1 & 2) to be contained in the
Section 10(a) prospectus is omitted from this Registration Statement in
accordance with Rule 428 under the Securities Act and the Note to Part I of Form
S-8.

                                     PART II

                 INFORMATION REQUIRED IN REGISTRATION STATEMENT

ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

         Dallas Semiconductor Corporation (the "Company") hereby incorporates by
reference in this Registration Statement the following documents previously
filed by the Company with the Securities and Exchange Commission (the
"Commission"):

         (1) The Company's Annual Report on Form 10-K filed with the Commission
for the fiscal year ended January 3, 1999.

         (2) The Company's Quarterly Report on Form 10-Q filed with the
Commission for the quarter ended April 4, 1999.

         (3) The description of the Company's common stock contained in the
Company's Registration Statement on Form 8-A filed with the Commission,
including any amendment or report filed for the purpose of updating such
description.

         All documents filed by the Registrant with the Commission pursuant to
Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), subsequent to the date of this Registration
Statement shall be deemed to be incorporated herein by reference and to be a
part hereof from the date of the filing of such documents until such time as
there shall have been filed a post-effective amendment that indicates that all
securities offered hereby have been sold or that deregisters all securities
remaining unsold at the time of such amendment.

ITEM 4.  DESCRIPTION OF SECURITIES.

         Not Applicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL.

         None.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         Section 145 of the Delaware General Corporation Law (the "DGCL")
empowers a corporation to indemnify any of its officers, directors or other
corporate agents against certain expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred
by the person to be indemnified in connection with certain actions, suits or
proceedings (threatened, pending or completed) if the person to be indemnified
acted in good faith and in a manner he or she reasonably believed to be in, or
not opposed to, the best interests of the corporation and, with respect to any
criminal action or proceeding, had no reasonable cause to believe his or her
conduct was unlawful.


                                      II-1

<PAGE>   3

         The Certificate of Incorporation and Bylaws of the Company each contain
provisions regarding the indemnification of directors and officers of the
Company. Subject to certain limitations expressed therein, Article IX of the
Company's Certificate of Incorporation provides for the indemnification of the
Company's officers and directors to the fullest extent permitted by the DGCL. In
addition, the Company's bylaws provide expanded rights of indemnification
including expressly authorizing against penalties and punitive damages, as well
as against judgments and amounts paid in settlement of derivative suits, and
under certain circumstances, indemnification for expenses incurred by a director
in defending a third party or corporate proceeding which are required to be paid
by the corporation on behalf of such director.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED.

         Not Applicable.

ITEM 8.  EXHIBITS.

         (a)      Exhibits.

                  The following documents are filed as a part of this
Registration Statement.

<TABLE>
<CAPTION>
         Exhibit        Description of Exhibit
         -------        ----------------------
<S>                     <C>
         4.1            Dallas Semiconductor Corporation 1987 Stock Option Plan

         4.2            Dallas Semiconductor Corporation 1993 Officer and Director Stock Option Plan

         5.1            Opinion of Jenkens & Gilchrist, a Professional Corporation

         23.1           Consent of Jenkens & Gilchrist, a Professional Corporation (included in opinion
                        filed as Exhibit 5.1 hereto)

         23.2           Consent of Ernst & Young LLP

         24.1           Power of Attorney (included with signature page of this Registration Statement)
</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:

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

                        (ii) To reflect in the prospectus any facts or events
arising after the effective date of the Registration Statement (or the most
recent post-effective amendment thereof) which, individually or in the
aggregate, represent a fundamental change in the information set forth in the
Registration Statement;

                        (iii) To include any material information with respect
to the plan of distribution not previously disclosed in the Registration
Statement or any material change to such information in the Registration
Statement;

                              Provided, however, that paragraphs (a)(1)(i) and
(a)(1)(ii) do not apply if the information required to be included in a
post-effective amendment by those paragraphs is contained in periodic reports
filed by the Registrant pursuant to Section 13 or Section 15(d) of the Exchange
Act that are incorporated by reference in the Registration Statement.


                                      II-2

<PAGE>   4


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

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

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

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


                                      II-3

<PAGE>   5


                                   SIGNATURES

         Pursuant to the requirements of the Securities Act, the Registrant
certifies that it has reasonable grounds to believe that it meets all 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 Dallas, State of Texas, on August 13, 1999.

                                 DALLAS SEMICONDUCTOR CORPORATION

                                 By:      /s/ C. V. Prothro
                                          --------------------------------------
                                          C.V. Prothro
                                          Chairman of the Board of Directors,
                                          President and Chief Executive Officer



                                      II-4

<PAGE>   6

                                POWER OF ATTORNEY

         KNOW ALL MEN BY THESE PRESENTS, that each individual whose signature
appears below hereby constitutes and appoints C.V. Prothro and M.D. Sampels, and
each of them, each with full power to act without the other, his true and lawful
attorneys-in-fact and agents, each with full power of substitution and
resubstitution for him and in his name, place and stead, in any and all
capacities, to sign any or all amendments to this Registration Statement, and to
file the same with all exhibits thereto and other documents in connection
therewith, with the Commission, granting unto each of said attorneys-in-fact and
agents full power and authority to do and perform each and every act and thing
requisite and necessary to be done in connection therewith, as fully to all
intents and purposes as he might or could do in person hereby ratifying and
confirming that each of said attorneys-in-fact and agents or his substitutes may
lawfully 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 included:


<TABLE>
<CAPTION>
      SIGNATURE                                            CAPACITY                                    DATE
      ---------                                            --------                                    ----
<S>                                         <C>                                                  <C>
/s/ C. V. Prothro                           Chairman of the Board of Directors                   August 13, 1999
- -------------------------                   President and Chief Executive Officer
C. V. Prothro

/s/ Alan P. Hale                            Vice President -  Finance                            August 13, 1999
- -------------------------
Alan P. Hale

/s/ Chao C. Mai                             Senior Vice President and Director                   August 13, 1999
- -------------------------
Chao C. Mai

/s/ Michael L. Bolan                        Vice President - Marketing and                       August 13, 1999
- -------------------------                   Product Development and Director
Michael L. Bolan

/s/ M. D. Sampels                           Director                                             August 13, 1999
- -------------------------
M. D. Sampels

/s/ Richard L. King                         Director                                             August 13, 1999
- -------------------------
Richard L. King

/s/ Carmelo J. Santoro                      Director                                             August 13, 1999
- -------------------------
Carmelo J. Santoro

/s/ E. R. Zumwalt, Jr.                      Director                                             August 13, 1999
- -------------------------
E. R. Zumwalt, Jr.

/s/ Jack R. von  Gillern                    Vice President - Sales                               August 13, 1999
- -------------------------
Jack R. von Gillern
</TABLE>


                                      II-5

<PAGE>   7



                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
         Exhibit        Description
         -------        -----------
<S>                     <C>
         4.1            Dallas Semiconductor Corporation 1987 Stock Option Plan

         4.2            Dallas Semiconductor Corporation 1993 Officer and Director Stock Option Plan

         5.1            Opinion of Jenkens & Gilchrist, a Professional Corporation

         23.1           Consent of Jenkens & Gilchrist, a Professional Corporation (included in opinion
                        filed as Exhibit 5.1 hereto)

         23.2           Consent of Ernst & Young LLP

         24.1           Power of Attorney (included with signature page of this Registration Statement)
</TABLE>


<PAGE>   1
                                                                     EXHIBIT 4.1

                                                   As Amended Effective 4-23-96


                        DALLAS SEMICONDUCTOR CORPORATION

                                      1987
                                STOCK OPTION PLAN


         1. Purpose. The Dallas Semiconductor Corporation 1987 Stock Option Plan
(the "Plan") is intended to advance the interests of Dallas Semiconductor
Corporation, a Delaware corporation (the "Company"), and its stockholders, by
encouraging and enabling selected officers, directors, consultants, agents and
employees, upon whose judgment, initiative and effort the Company is largely
dependent for the successful conduct of its business, to acquire and retain a
proprietary interest in the Company by ownership of its stock. It is intended
that options which may qualify for treatment as "incentive stock options" under
Section 422A of the Internal Revenue Code of 1986, as amended, and applicable
regulations and rulings promulgated thereunder (collectively the "Code"), as
well as options which may not so qualify, may be granted under the Plan.

         2. Definitions.

                  (a) "Annual Grant Date" means October 4, 1996, and October 4
         of each year thereafter.

                  (b) "Board" means the Board of Directors of the Company or a
         Committee of the Board to whom its authority has been delegated.

                  (c) "Common Stock" means the Company's Common Stock, $.02 par
         value per share.


<PAGE>   2


                  (d) "Date of Grant" means the date on which an Option is
         granted under the Plan, which will be the date the Board authorizes the
         Option unless the Board specifies a later date.

                  (e) "Date of Exercise" means the date on which an Option is
         validly exercised pursuant to the Plan.

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

                  (g) "Fair Market Value" of the Company's Common Stock means,
         as long as the Company's Common Stock is traded on the New York Stock
         Exchange, the closing price of such stock on the New York Stock
         Exchange on such date (or if such date is not a trading day, on the
         last trading day immediately preceding such date) or, if not so traded,
         on the NASDAQ National Market System or another national exchange upon
         which the Company's Common Stock is traded or as otherwise determined
         by the Board, based on any reasonable valuation method.

                  (h) "Option" means an option granted under the Plan.

                  (i) "Optionee" means a person to whom an Option, which has not
         expired, has been granted under the Plan.

                  (j) "Subsidiary" or "Subsidiaries" means a subsidiary
         corporation or corporations of the Company as defined in Section 425(f)
         of the Code.

                  (k) "Successor" means the legal representative of the estate
         of a deceased optionee or the person or persons who acquire the right
         to exercise an Option by bequest or inheritance or by reason of the
         death of an Optionee.


                                       2
<PAGE>   3

                  (l) "Incentive Stock Option" means an option that qualifies as
         an incentive stock option under all of the requirements of the Code.

                  (m) "Incentive Stock Option Agreement" means the agreement
         between the Company and the Optionee, in such form as may from time to
         time be adopted by the Board, under which the Optionee may purchase
         Common Stock pursuant to the terms of an Incentive Stock Option granted
         under the Plan.

                  (n) "Non-Qualified Stock Option" means an option to purchase
         Common Stock granted pursuant to the provisions of the Plan that does
         not qualify as an Incentive Stock Option.

                  (o) "Non-Qualified Stock Option Agreement" means the agreement
         between the Company and the Optionee, in such form as may from time to
         time be adopted by the Board, under which the Optionee may purchase
         Common Stock pursuant to the terms of a Non-Qualified Stock Option
         granted under the Plan.

                  (p) "Rule 16b-3" means Rule 16b-3 promulgated under the
         Exchange Act, as (and to the extent) such rule, or any successor
         thereto, may from time to time be in effect and including all
         interpretations thereunder.

         3. Administration and Interpretation of Plan. The Plan shall be
administered by the Board. The Board shall have full and final authority in its
discretion, subject to the provisions of the Plan: (i) to determine the
individuals to whom, and the time or times at which, Options shall be granted
and the number of shares of Common Stock covered by each Option; (ii) to
construe and interpret the Plan; and (iii) to make all other determinations and
take all other actions deemed necessary or advisable for the proper
administration of the Plan. All such actions and determinations by the Board
shall be final and conclusively binding for all


                                       3
<PAGE>   4

purposes and upon all persons. Any Committee authorized to administer the Plan
shall consist entirely of disinterested persons in accordance with the
provisions of Rule 16b-3.

         4. Common Stock Subject to Options. The maximum number of shares of
Common Stock of the Company which may be issued upon the exercise of Options
granted under the Plan is 4,860,000 increased on and as of January 1 of each
calendar year from and including January 1, 1996, by a number of shares equal to
one percent (1%) of the number of shares of Common Stock outstanding on December
31 of the preceding year; subject to adjustment by the Board to reflect, as
deemed appropriate by the Board, any stock dividend, stock split, reverse stock
split, share combination, reorganization, recapitalization or the like, of or by
the Company. The shares of Common Stock to be issued upon the exercise of
Options may be authorized but unissued shares, shares issued and reacquired by
the Company or shares bought on the open market for the purposes of the Plan. In
the event any Option shall, for any reason, terminate or expire or be canceled
or surrendered without having been exercised in full, the shares subject to such
Option, but not purchased thereunder, shall again be available for Options to be
granted under the Plan.

         5. Participants. Options may be granted under the Plan to any person
who is an officer or other key employee (including officers and employees who
are also directors) or a consultant of the Company or any of its Subsidiaries
provided however, that no member of any Committee administering this Plan shall
be eligible to be granted an option hereunder except (i) pursuant to the
provisions of Section 7 hereof or (ii) under any other circumstances that may be
permitted under Rule 16b-3 without adversely affecting any requirement of such
rule that this Plan be administered by disinterested persons.


                                       4
<PAGE>   5


         6. Terms and Conditions of Options. Any Option granted under the Plan
shall be evidenced by either an Incentive Stock Option Agreement or a
Non-Qualified Stock Option Agreement executed by the Company and the Optionee.
Such agreement shall be subject to the following limitations and conditions:

                  (a) Option Price. The option price per share with respect to
         each Option shall be determined by the Board but in no instance shall
         the option price for an Option which is intended to qualify as an
         Incentive Stock Option be less than 100% of the Fair Market Value of a
         share of the Common Stock on the Date of Grant.

                  (b) Payment of Option Price. Full payment for shares purchased
         upon exercising an Option shall be made in cash or by check, or by
         delivery of previously owned shares of Common Stock, or partly in cash
         or by check and partly in such stock. The value of shares of Common
         Stock delivered in connection with the payment of the option price
         shall be the Fair Market Value of such shares on the Date of Exercise
         of the Option.

                  (c) Term of Option. The expiration date of each Incentive
         Stock Option shall not be more than ten (10) years from the Date of
         Grant. The expiration date of each Non-Qualified Stock Option shall not
         be more than eleven (11) years from the Date of Grant.

                  (d) Vesting of Stockholder Rights. Neither an Optionee nor his
         Successor shall have any of the rights of a stockholder of the Company
         until the certificate or certificates evidencing the shares purchased
         pursuant to the exercise of an Option are properly delivered to such
         Optionee or his Successor.



                                       5
<PAGE>   6

                  (e) Exercise of an Option. Each Option shall be exercisable at
         any time, and from time to time, and in no particular order if the
         Optionee holds more than one Option, throughout a period commencing on
         or after the Date of Grant, as specified by the Board, and ending upon
         the earliest of the expiration, cancellation, surrender or termination
         of the Option; provided however, that no Option shall be exercisable in
         whole or in part prior to the date of stockholder approval of the Plan.
         Furthermore, the exercise of each Option shall be subject to the
         condition that if at any time the Company shall determine in its
         discretion that the satisfaction of withholding tax or other
         withholding liabilities, or that the listing, registration, or
         qualification of any share otherwise deliverable upon such exercise
         upon any securities exchange or under any state or federal law, or that
         the report to, or consent or approval of, any regulatory body, is
         necessary or desirable as a condition of, or in connection with, such
         exercise or the delivery or purchase of shares pursuant thereto, then
         in any such event, such exercise shall not be effective unless such
         withholding, listing, registration, qualification, report, consent or
         approval shall have been effected or obtained free of any conditions
         not acceptable to the Company.

                  (f) Stock Appreciation Rights. Any Option may include a Stock
         Appreciation Right, either at the Date of Grant or later by amendment
         approved by the Board, and provision therefor shall be included in the
         stock option agreement at such time consistent with the terms hereof.
         Such Stock Appreciation Right shall be subject to such terms and
         conditions not inconsistent with the Plan as the Board shall impose,
         including the following:


                                       6
<PAGE>   7

                           (i) It shall be exercisable only when and to the
                  extent the Option is exercisable and only at such time as the
                  value of the Company's Common Stock is equal to or greater
                  than the option price specified in such Option.

                           (ii) It shall entitle the Optionee to surrender
                  unexercised the Option in which the Stock Appreciation Right
                  is included (or any portion of such Option) to the Company and
                  to receive from the Company in exchange therefor that number
                  of shares of Common Stock having an aggregate value equal to
                  the excess of the Fair Market Value of one share, on the day
                  immediately preceding the date on which the Stock Appreciation
                  Right is exercised, over the purchase price per share
                  specified in such option, times the number of shares called
                  for by the Option, or portion thereof, which is so
                  surrendered. The Company, in its discretion, shall be entitled
                  to elect to settle its obligation arising out of the exercise
                  of a Stock Appreciation Right by the payment of cash equal to
                  the aggregate value of the shares it would otherwise be
                  obligated to deliver. The Company may also elect to settle
                  such obligation partly in cash and partly in Common Stock. In
                  lieu thereof, the Company shall have the right, in its
                  discretion, to the extent it shall deem advisable to consent
                  to or disapprove the election of the Optionee to receive cash
                  in full or partial settlement of a Stock Appreciation Right.

                           (iii) No fractional shares shall be delivered
                  pursuant to exercise of a Stock Appreciation Right but in lieu
                  thereof a cash adjustment shall be made.

                           (iv) Notwithstanding the other provisions hereof, to
                  the extent that a Stock Appreciation Right included in an
                  Option is exercised, such Option shall


                                       7
<PAGE>   8

                  be deemed to have been exercised to the extent of the number
                  of shares of Common Stock called for by the Option or portion
                  thereof which is surrendered on exercise of the Stock
                  Appreciation Right, so that such shares shall no longer be
                  reserved for issuance upon the exercise of Options to be
                  granted under the Plan.

                           (v) The Board shall have the right, without the
                  consent or approval of the Optionee, at any time after the
                  grant of a Stock Appreciation Right to limit the time within
                  or extent to which such Stock Appreciation Right may be
                  exercisable, to limit the maximum amount of appreciation that
                  may be recognized in connection with the exercise thereof or
                  to in any other manner it, in its discretion, shall deem
                  advisable amend or terminate such Stock Appreciation Right.

                           (vi) A Stock Appreciation Right granted pursuant to
                  the Plan shall not be exercisable unless and until the
                  Optionee shall have completed one (1) continuous year of full
                  time employment with the Company subsequent to the time of
                  grant of such Stock Appreciation Right. For the purposes
                  hereof, full time employment shall be such as may be
                  established by the Board.

                           (vii) The Company shall have the right at any time to
                  amend this provision of the Plan dealing with Stock
                  Appreciation Rights, and the provisions of any stock option
                  agreement pursuant to the Plan dealing with a Stock
                  Appreciation Right, to the extent that it, in its discretion,
                  shall deem to be necessary in order to comply with the
                  provisions of Rule 16b-3.


                                       8
<PAGE>   9

                  (g) Non-ISO Tax Offset Bonus. The Board may grant a Tax Offset
         Bonus to such Optionees and on such bases as the Board shall determine,
         including, but not limited to, a Tax Offset Bonus which becomes
         exercisable only upon an Optionee's being subject to the restrictions
         of Section 16 of the Exchange Act, and a provision relating thereto
         shall be included in the stock option agreement at the time the right
         is granted. A Tax Offset Bonus may be granted only with respect to a
         Non-Qualified Stock Option under the Plan, and may be granted
         concurrently with or after the grant of the Non-Qualified Stock Option.
         A Tax Offset Bonus shall entitle an Optionee to receive from the
         Company or a Subsidiary an amount in cash no greater than the then
         existing maximum statutory Federal income tax rate (including any
         surtax or similar charge or assessment) for individuals multiplied by
         the amount of ordinary income, if any, realized by the Optionee for
         Federal income tax purposes as a result of the exercise of the
         Non-Qualified Stock Option. The Board may cancel or place a limit on
         the term of, or the amount payable for, any Tax Offset Bonus at any
         time. The Board shall determine all other terms and provisions of any
         Tax Offset Bonus grant. The Company shall not be required to fund such
         Tax Offset Bonus prior to the due date for such taxes, and the proceeds
         of such Tax Offset Bonus shall be advanced to the Optionee in the form
         of a check payable to the Internal Revenue Service for the account of
         the Optionee or such other method as the Board may determine. The Board
         shall have the right to require an Optionee to present reasonable proof
         of the amount of such taxes as a condition precedent to the making of
         such payment. The Company shall be under no obligation of any nature to
         grant any Tax Offset Bonus to any Optionee at any time.


                                       9
<PAGE>   10

                  (h) Company Loans. The Company may make stock purchase loans
         in connection with Option exercises upon the following terms and
         conditions:

                           (i) Upon the exercise by an Optionee of his Option,
                  or any part thereof, and the Optionee's request for a loan
                  pursuant hereto, the Company, upon approval by the Board, may
                  loan said Optionee, for the sole purpose of purchasing Common
                  Stock from the Company pursuant to the exercise of such
                  Option, an amount equal to the excess of the exercise price of
                  the Option over the aggregate par value of the Common Stock
                  which the Optionee has elected to purchase pursuant to such
                  exercise; provided, however, that the Optionee shall execute
                  concurrently a promissory note in form satisfactory to the
                  Board for such amount payable to the order of the Company;

                           (ii) The Company shall have no obligation to make any
                  loan to any Optionee at any time;

                           (iii) The promissory note referenced hereinbefore
                  shall provide for interest to be payable upon the outstanding
                  principal balance thereof at such rate and times as the Board
                  may determine. Such note shall also provide that the Board may
                  require the Optionee to secure the payment thereof at any time
                  with collateral deemed adequate by the Board in its sole
                  discretion. Such note shall mature, and all outstanding
                  principal and interest shall become immediately due and
                  payable in installments or in lump sum at such time or times
                  as the Board shall provide. The note will provide for
                  prepayment of principal and accrued interest in whole or in
                  part from time to time without premium or penalty and may be
                  extended or modified, from time to time, at the


                                       10
<PAGE>   11

                  Board's discretion. The note shall provide for acceleration of
                  maturity by the Company upon the happening of any events
                  determined appropriate by the Board, including without
                  limitation, any of the following events:

                                    (1) failure of the Optionee to pay or
                           perform any term or provision thereof; or

                                    (2) termination of the Optionee's employment
                           with the Company or a Subsidiary for any reason,
                           except retirement, disability or death; or

                                    (3) if the Optionee shall execute an
                           assignment for the benefit of creditors, or admit in
                           writing his ability to pay his debts generally as
                           they become due, or voluntarily seek the benefit of,
                           or have a petition filed against him seeking the
                           benefit of, a judgment, order or decree filed against
                           him pursuant to any bankruptcy, insolvency,
                           reorganization, or similar debtor relief law
                           affecting the rights of creditors generally; or

                                    (4) failure of the Optionee to have
                           discharged within a period of thirty (30) days after
                           the commencement thereof any attachment,
                           sequestration, or similar proceeding against any of
                           the assets of the Optionee; or

                                    (5) failure of the Optionee to pay any money
                           judgment against him at least thirty (30) days prior
                           to the date on which any of his assets may be
                           lawfully sold to satisfy such judgment; or



                                       11
<PAGE>   12

                                    (6) failure or refusal of the Optionee to
                           comply with any of the terms and conditions of his
                           stock option agreement or any other oral or written
                           agreement with the Company; or

                                    (7) failure or refusal of the Optionee to
                           provide adequate security for payment of the
                           promissory note immediately upon request for
                           collateral by the Board; or

                                    (8) the divorce of the Optionee, unless
                           arrangements satisfactory to the Board are agreed to
                           prior to the entry of the divorce decree.

                  (i) Nontransferability of Option. No Option shall be
         transferable or assignable by an Optionee, voluntarily, or by operation
         of law, other than by will or the laws of descent and distribution.
         Each Option shall be exercisable, during the Optionee's lifetime, only
         by him. Notwithstanding the first two sentences of this Paragraph 6(i),
         if and when the Securities and Exchange Commission amends Rule 16b-3 of
         the Exchange Act of 1934, as amended, to remove the restriction on
         transferability of options, Options granted under the Plan may be
         freely assignable by the Optionee if so authorized by the Compensation
         Committee of the Board of Directors of the Company. No Option or the
         shares covered thereby shall be pledged or hypothecated in any way and
         no Option or the shares covered thereby shall be subject to execution,
         attachment, or similar process except with the prior express written
         consent of the Board.

                  (j) Termination of Employment. Upon termination of an
         Optionee's employment with the Company or with any of its Subsidiaries
         for any reason other than


                                       12
<PAGE>   13

         retirement, permanent disability or death, any and all outstanding
         Option(s) of such Optionee shall immediately thereupon be null and
         void. Upon termination of an Optionee's employment with the Company or
         with any of its Subsidiaries by reason of his retirement, or permanent
         disability, but excluding his death, his option privileges shall be
         limited to the shares which were immediately purchasable by him at the
         date of its expiration or three (3) months after the date of such
         termination, whichever occurs first. Neither the adoption of this Plan
         nor the grant of an Option to an eligible person shall alter in any way
         the Company's or the relevant Subsidiary's rights to terminate such
         person's employment or directorship at any time with or without cause
         nor does it confer upon such person any rights or privileges to
         continued employment, or any other rights and privileges, except as
         specifically provided in the Plan.

                  (k) Death of Optionee. If an Optionee dies while in the employ
         of the Company or any Subsidiary, his option privileges shall be
         limited to the shares which were immediately purchasable by him at the
         date of death and such option privileges shall expire unless exercised
         by his Successor prior to the date of its expiration or one (1) year
         from the date of the Optionee's death, whichever occurs first.

                  (l) Ten Percent Stockholder. Notwithstanding anything herein
         to the contrary, an Option which is intended to qualify as an Incentive
         Stock Option shall be granted hereunder to any Optionee who,
         immediately before such Option is granted, beneficially owns, directly
         or indirectly, more than 10% of the total voting power of all classes
         of stock of the Company only if both of the following conditions are
         met:

                           (i) The option price per share shall be no less than
                  110% of the Fair Market Value of a share of Common Stock on
                  the Date of Grant; and


                                       13
<PAGE>   14

                           (ii) The expiration date of the Option shall be not
                  more than five (5) years from the Date of Grant.

                  (m) Other Terms. Each Incentive Stock Option Agreement or
         Non-Qualified Stock Option Agreement, as the case may be, may contain
         such other provisions (not inconsistent herewith) as the Board in its
         discretion may determine, including, without limitation:

                           (i) in the event that an Option shall be immediately
                  exercisable, any provision which shall provide that the shares
                  acquired pursuant thereto shall not be deemed to have been
                  issued pursuant to a fully vested stock option and thereby
                  subject to repurchase rights (if any) contained in the
                  shareholder's agreement with the Optionee, entered into
                  pursuant to Paragraph 10 hereof;

                           (ii) any provision which shall condition the exercise
                  of all or part of an Option upon such matters as the Board may
                  deem appropriate (if any) such as the passage of time, or the
                  attainment of certain performance goals, appropriate to
                  reflect the contribution of the Optionee to the performance of
                  the Company;

                           (iii) any provision which would give the Board the
                  discretionary authority to accelerate the exercisability of an
                  Option in spite of any provision contained in an Option
                  pursuant to clause (ii) above, under such circumstances as the
                  Board may deem appropriate; and

                           (iv) the manner in which an Option is to be
                  exercised.

         7. Allotment of Shares. The grant of an Option shall not be deemed
either to entitle the Optionee to, or disqualify the Optionee from,
participation in any other grant of options



                                       14
<PAGE>   15

under this Plan or any other stock option plan of the Company. The number of
shares allotted to each Optionee shall be determined as follows:

                  (a) Optionees Other than Non-Employee Directors. The Board
         shall, in its discretion, determine the number of shares of Common
         Stock to be offered from time to time by grant of Options to officers,
         key employees and consultants of the Company or its Subsidiaries;
         provided that the aggregate Fair Market Value (determined as of the
         time the option is granted) of the Common Stock with respect to which
         Options which are intended to qualify as Incentive Stock Options are
         exercisable for the first time by such Optionee during any calendar
         year (under all such plans of the Optionee's employer corporation and
         its parent and subsidiary corporations) shall not exceed $100,000.

                  (b) Non-Employee Directors. Subject to the limitations imposed
         pursuant to Section 4 of this Plan as to the aggregate number of shares
         that may be issued hereunder, each non-employee director of the Company
         except C. Richard Kramlich and any other non-employee director elected
         after March 2, 1990 who is required to remit his remuneration as a
         director of the Company (including stock options) to a venture capital
         fund or other similar entity with which he is affiliated, effective as
         of the Annual Grant Date of each year, commencing with March 2, 1990,
         shall be granted an Option to purchase 10,000 shares of Common Stock
         subject to adjustment by the Board to reflect, as deemed appropriate by
         the Board, any stock dividend, stock split, reverse stock split, share
         combination, reorganization or the like, of or by the Company at a
         price equal to 100% of the Fair Market Value of the Common Stock on the
         date


                                       15
<PAGE>   16

         of grant, for a term of ten (10) years. The eligibility of each
         non-employee director to receive a grant under this provision shall be
         determined as of each Annual Grant Date.

         8. Adjustments. The number of shares of Common Stock covered by each
outstanding Option granted under the Plan and the option price shall be adjusted
to reflect, as deemed appropriate by the Board in its discretion, any stock
dividend, stock split, reverse stock split, share combination, exchange of
shares, recapitalization, merger, consolidation, separation, reorganization,
liquidation or the like of or by the Company. Decisions by the Board as to what
adjustments shall be made, and the extent thereof, shall be final, binding and
conclusive on all Optionees.

         9. Designation of Incentive Stock Options. The Board shall cause each
Option granted hereunder to be clearly designated in the agreement evidencing
such Option, at the time of grant, as to whether or not it is intended to
qualify as an Incentive Stock Option.

         10. Execution of Shareholder's Agreement. Options may only be exercised
hereunder by employees who have executed a Shareholder's Agreement in such form
as the Board may adopt from time to time.

         11. Notices. Whenever any notice is required or permitted hereunder,
such notice must be in writing and personally delivered or sent by mail. Any
notice required or permitted to be delivered hereunder shall be deemed to be
delivered on the date which it is personally delivered, or, whether actually
received or not, on the third business day after it is deposited in the United
States mail, certified or registered, postage prepaid, addressed to the person
who is to receive it at the address which such person has theretofore specified
by written notice delivered in accordance herewith. The Company or an Optionee
may change, at any time and from time to time, by written notice to the other,
the address which it or he had


                                       16
<PAGE>   17


theretofore specified for receiving notices. Until changed in accordance
herewith, the Company and each Optionee shall specify as its and his address for
receiving notices the address set forth in the option agreement pertaining to
the shares to which such notice relates.

         12. Amendment or Discontinuance. The Plan and any Option outstanding
hereunder may be amended or discontinued by the Board without the approval of
the stockholders of the Company, except that the Board may not, except as
expressly provided in the Plan, increase the aggregate number of shares which
may be issued under Options granted pursuant to the Plan, materially amend the
eligibility requirements of the Plan or materially increase the benefits which
may accrue to participants under the Plan, without such approval (if any) as may
be required pursuant to the provisions of Rule 16b-3, or applicable law or the
requirements of any national stock exchange upon which the Company's Common
Stock is traded.

         13. Effect of the Plan. Neither the adoption of this Plan nor any
action of the Board shall be deemed to give any officer or employee any right to
be granted an option to purchase Common Stock of the Company or any of its
Subsidiaries, or any other rights except as may be evidenced by a stock option
agreement, or any amendment thereto, duly authorized by the Board and executed
on behalf of the Company and then only to the extent and on the terms and
conditions expressly set forth therein.

         14. Grant of Incentive Stock Options. No Incentive Stock Options shall
be granted pursuant to this Plan after the expiration of ten years from the date
of the earlier of: (i) the date the Plan is adopted, or (ii) the date the Plan
is approved by the stockholders of the Company.

<PAGE>   1
                                                                     EXHIBIT 4.2

                                                   As Amended Effective 12-16-97


                        DALLAS SEMICONDUCTOR CORPORATION

                            1993 OFFICER AND DIRECTOR
                                STOCK OPTION PLAN


         1. Purpose. The Dallas Semiconductor Corporation 1993 Officer and
Director Stock Option Plan (the "Plan") is intended to advance the interests of
Dallas Semiconductor Corporation, a Delaware corporation (the "Company"), and
its stockholders, by encouraging and enabling selected officers and directors,
upon whose judgment, initiative and effort the Company is largely dependent for
the successful conduct of its business, to acquire and retain a proprietary
interest in the Company by ownership of its stock. It is intended that options
which do not qualify for treatment as "incentive stock options" under Section
422A of the Internal Revenue Code of 1986, as amended, and applicable
regulations and rulings promulgated thereunder (collectively the "Code"), may be
granted under the Plan.

         2. Definitions.

                  (a) "Automatic Grant Date" means (i) with respect to each
         non-employee director of the Company in office on the date this Plan is
         adopted by the Board, the date this Plan is adopted by the Board, and
         (ii) with respect to each non-employee director of the Company first
         elected to the Board subsequent to the date this Plan is adopted, the
         date such director is elected to the Board.

                  (b) "Board" means the Board of Directors of the Company or a
         Committee of the Board to whom its authority has been delegated.

                  (c) "Change of Control" means (a) any time at which any
         "person" (as such term is used in Sections 13(d) and 14(d) of the
         Securities Exchange Act of 1934, as amended on the date


<PAGE>   2

         of adoption of this Plan), other than the Company, a subsidiary of the
         Company or any savings, pension, or other benefit plan for the benefit
         of employees of the Company or its subsidiaries, acquires or otherwise
         becomes the beneficial owner of shares of Common Stock of the Company
         (or an other voting securities of the Company, or options, warrants or
         other securities or rights convertible into, exchangeable for or
         exercisable for Common Stock or any other voting securities of the
         Company) in a transaction or series of transactions that results in
         such person, directly or indirectly, owning more than twenty percent
         (20%) of the outstanding shares of Common Stock of the Company
         (including, for this purpose, all other securities having the right to
         vote generally in the election of directors); (b) in connection with or
         as a result of any cash tender offer, merger or other business
         combination, sale of assets or contested election (by proxy or
         otherwise), the resignation of director(s), or any combination of the
         foregoing transactions (a "Transaction"), such time as the persons who
         were non-employee directors before the Transaction shall cease to
         constitute at least a majority of the non-employee directors on the
         Board of Directors of the Company or any successor to the Company; or
         (c) the election of any person other than C.V. Prothro as chairman and
         chief executive officer of the Company.

                  (d) "Common Stock" means the Company's Common Stock, $.02 par
         value per share.

                  (e) "Date of Grant" means the date on which an Option is
         granted under the Plan, which will be the date the Board authorizes the
         Option unless the Board specifies a later date.

                  (f) "Date of Exercise" means the date on which an Option is
         validly exercised pursuant to the Plan.

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



                                       2
<PAGE>   3

                  (h) "Fair Market Value" of the Company's Common Stock means,
         as long as the Company's Common Stock is traded on the New York Stock
         Exchange, the closing price of such stock on the New York Stock
         Exchange on such date (or if such date is not a trading day, on the
         last trading day immediately preceding such date) or, if not so traded,
         on the NASDAQ National Market System or another national exchange upon
         which the Company's Common Stock is traded or as otherwise determined
         by the Board, based on any reasonable valuation method.

                  (i) "Option" means an option granted under the Plan.

                  (j) "Optionee" means a person to whom an Option, which has not
         expired, has been granted under the Plan.

                  (k) "Successor" means the legal representative of the estate
         of a deceased optionee or the person or persons who acquire the right
         to exercise an Option by bequest or inheritance or by reason of the
         death of an Optionee.

                  (l) "Stock Option Agreement" means the agreement between the
         Company and the Optionee, in such form as may from time to time be
         adopted by the Board, under which the Optionee may purchase Common
         Stock pursuant to the terms of an Option granted under the Plan.

                  (m) "Rule 16b-3" means Rule 16b-3 promulgated under the
         Exchange Act, as (and to the extent) such rule, or any successor
         thereto, may from time to time be in effect and including all
         interpretations thereunder.

         3. Administration and Interpretation of Plan. The Plan shall be
administered by the Board. The Board shall have full and final authority in its
discretion, subject to the provisions of the Plan: (i) to determine the
individuals to whom, and the time or times at which, Options shall be granted
and the number of shares of Common Stock covered by each Option; (ii) to
construe and interpret the Plan; and (iii) to


                                       3
<PAGE>   4

make all other determinations and take all other actions deemed necessary or
advisable for the proper administration of the Plan. All such actions and
determinations by the Board shall be final and conclusively binding for all
purposes and upon all persons. Any Committee authorized to administer the Plan
shall consist entirely of disinterested persons in accordance with the
provisions of Rule 16b-3.

         4. Common Stock Subject to Options. The maximum number of shares of the
Company's Common Stock which may be issued upon the exercise of Options granted
under the Plan is 2,300,000 increased on and as of January 1 of each calendar
year from and including January 1, 1994 by a number of shares equal to
one-percent (1%) of the number of shares of Common Stock outstanding on December
31 of the preceding year; subject to adjustment by the Board to reflect, as
deemed appropriate by the Board, any stock dividend, stock split, reverse stock
split, share combination, reorganization, recapitalization or the like, of or by
the Company. The shares of Common Stock to be issued upon the exercise of
Options may be authorized but unissued shares, shares issued and reacquired by
the Company or shares bought on the open market for the purposes of the Plan. In
the event any Option shall, for any reason, terminate or expire or be canceled
or surrendered without having been exercised in full, the shares subject to such
Option, but not purchased thereunder, shall again be available for Options to be
granted under the Plan.

         5. Participants. Options may be granted under the Plan to any person
who is an officer or director of the Company, provided however, that no member
of any Committee administering this Plan shall be eligible to be granted an
option hereunder except (i) pursuant to the provisions of Section 7(b) hereof or
(ii) under any other circumstances that may be permitted under Rule 16b-3
without adversely affecting any requirement of such rule that this Plan be
administered by disinterested persons.


                                       4
<PAGE>   5

         6. Terms and Conditions of Options. Any Option granted under the Plan
shall be evidenced by a Stock Option Agreement executed by the Company and the
Optionee. Such agreement shall be subject to the following limitations and
conditions:

                  (a) Option Price. The option price per share with respect to
         each Option shall be determined by the Board but in no instance shall
         the option price for an Option be less than 100% of the Fair Market
         Value of a share of the Common Stock on the Date of Grant.

                  (b) Payment of Option Price. Full payment for shares purchased
         upon exercising an Option shall be made in cash or by check, or by
         delivery of previously owned shares of Common Stock, or partly in cash
         or by check and partly in such stock. The value of shares of Common
         Stock delivered in connection with the payment of the option price
         shall be the Fair Market Value of such shares on the Date of Exercise
         of the Option.

                  (c) Term of Option. The expiration date of each Option shall
         not be more than ten (10) years from the Date of Grant.

                  (d) Vesting of Stockholder Rights. Neither an Optionee nor his
         Successor shall have any of the rights of a stockholder of the Company
         until the certificate or certificates evidencing the shares purchased
         pursuant to the exercise of an Option are properly delivered to such
         Optionee or his Successor.

                  (e) Exercise of an Option. Each Option shall be exercisable at
         any time, and from time to time, and in no particular order if the
         Optionee holds more than one Option, throughout a period commencing on
         or after the Date of Grant, as specified by the Board, and ending upon
         the earliest of the expiration, cancellation, surrender or termination
         of the Option; provided however, that no Option shall be exercisable in
         whole or in part prior to the date of stockholder approval of the Plan.


                                       5
<PAGE>   6

         Furthermore, the exercise of each Option shall be subject to the
         condition that if at any time the Company shall determine in its
         discretion that the satisfaction of withholding tax or other
         withholding liabilities, or that the listing, registration, or
         qualification of any share otherwise deliverable upon such exercise
         upon any securities exchange or under any state or federal law, or that
         the report to, or consent or approval of, any regulatory body, is
         necessary or desirable as a condition of, or in connection with, such
         exercise or the delivery or purchase of shares pursuant thereto, then
         in any such event, such exercise shall not be effective unless such
         withholding, listing, registration, qualification, report, consent or
         approval shall have been effected or obtained free of any conditions
         not acceptable to the Company.

                  (f) Tax Offset Bonus. The Board may grant a Tax Offset Bonus
         to such Optionees and on such bases as the Board shall determine, and a
         provision relating thereto shall be included in the stock option
         agreement at the time the right is granted. A Tax Offset Bonus may be
         granted concurrently with or after the grant of an Option. A Tax Offset
         Bonus shall entitle an Optionee to receive from the Company an amount
         in cash no greater than the then existing maximum statutory Federal
         income tax rate (including any surtax or similar charge or assessment)
         for individuals multiplied by the amount of ordinary income, if any,
         realized by the Optionee for Federal income tax purposes as a result of
         the exercise of the Option. The Board may cancel or place a limit on
         the term of, or the amount payable for, any Tax Offset Bonus at any
         time. The Board shall determine all other terms and provisions of any
         Tax Offset Bonus grant. The Company shall not be required to fund such
         Tax Offset Bonus prior to the due date for such taxes, and the proceeds
         of such Tax Offset Bonus shall be advanced to the Optionee in the form
         of a check payable to the Internal Revenue Service for the account of
         the Optionee or such other method as the Board may



                                       6
<PAGE>   7

         determine. The Board shall have the right to require an Optionee to
         present reasonable proof of the amount of such taxes as a condition
         precedent to the making of such payment. The Company shall be under no
         obligation of any nature to grant any Tax Offset Bonus to any Optionee
         at any time and the Company shall grant a Tax Offset Bonus to a
         non-employee director of the Company only upon such terms and
         conditions, if any, as may be permitted under Rule 16b-3 without
         adversely affecting any requirement of such rule that this Plan be
         administered by disinterested persons.

                  (g) Company Loans. The Company may make stock purchase loans
         in connection with Option exercises upon the following terms and
         conditions:

                           (i) Upon the exercise by an Optionee of an Option, or
                  any part thereof, and the Optionee's request for a loan
                  pursuant hereto, the Company, upon approval by the Board, may
                  loan said Optionee, for the sole purpose of purchasing Common
                  Stock from the Company pursuant to the exercise of such
                  Option, an amount equal to the excess of the exercise price of
                  the Option over the aggregate par value of the Common Stock
                  which the Optionee has elected to purchase pursuant to such
                  exercise; provided, however, that the Optionee shall execute
                  concurrently a promissory note in form satisfactory to the
                  Board for such amount payable to the order of the Company;

                           (ii) The Company shall have no obligation to make any
                  loan to any Optionee at any time and the Company shall make a
                  loan hereunder to a non-employee director of the Company only
                  upon such terms and conditions, if any, as may be permitted
                  under Rule 16b-3 without adversely affecting any requirement
                  of such rule that this Plan be administered by disinterested
                  persons;



                                       7
<PAGE>   8

                           (iii) The promissory note referenced hereinbefore
                  shall provide for interest to be payable upon the outstanding
                  principal balance thereof at such rate and times as the Board
                  may determine. Such note shall also provide that the Board may
                  require the Optionee to secure the payment thereof at any time
                  with collateral deemed adequate by the Board in its sole
                  discretion. Such note shall mature, and all outstanding
                  principal and interest shall become immediately due and
                  payable in installments or in lump sum at such time or times
                  as the Board shall provide. The note will provide for
                  prepayment of principal and accrued interest in whole or in
                  part from time to time without premium or penalty and may be
                  extended or modified, from time to time, at the Board's
                  discretion. The note shall provide for acceleration of
                  maturity by the Company upon the happening of any events
                  determined appropriate by the Board.

                  (h) Transferability of Option. Other than by will or by laws
         of descent and distribution, an option granted under the Plan shall be
         transferable or assignable by an Optionee only if and under terms and
         conditions approved by the Board in its sole discretion. No Option or
         the shares covered thereby shall be pledged or hypothecated in any way
         and no Option or the shares covered thereby shall be subject to
         execution, attachment, or similar process except with the prior express
         written consent of the Board.

                  (i) Termination of Employment or Directorship. Upon
         termination of an Optionee's employment with the Company for any reason
         other than retirement, permanent disability or death or upon removal of
         a non-employee director of the Company from office, any and all
         outstanding Option(s) of such Optionee shall immediately thereupon be
         null and void. Upon termination of an Optionee's employment with the
         Company by reason of his retirement, or permanent disability, but



                                       8
<PAGE>   9

         excluding his death, his option privileges shall be limited to the
         shares which were immediately purchasable by him at the date of its
         expiration or three (3) months after the date of such termination,
         whichever occurs first. Upon the resignation or retirement of a
         non-employee director who has served as a director of the Company for
         more than three (3) years, any vesting of his option privileges shall
         immediately accelerate, so that all unexercised option privileges shall
         become immediately exercisable, and such option privileges will expire
         unless exercised by him, or (in the event of his subsequent death) his
         Successor, on or before the date any such Option expires by its own
         terms. Upon the resignation or retirement of a non-employee director
         who has served as a director of the Company for less than three (3)
         years, such Optionee or (in the event of his subsequent death) his
         Successor, will be entitled to exercise all unexercised option
         privileges exercisable by the Optionee at the time of his resignation
         or retirement on or before the date any such Option expires by its own
         terms. Neither the adoption of this Plan nor the grant of an Option to
         an eligible person shall alter in any way the Company's rights to
         terminate such person's employment or directorship at any time with or
         without cause nor does it confer upon such person any rights or
         privileges to continued employment, or any other rights and privileges,
         except as specifically provided in the Plan.

                  (j) Death of Optionee. If an Optionee (other than a
         non-employee director) dies while in the employ of the Company, his
         option privileges shall be limited to the shares which were immediately
         purchasable by him at the date of death and such option privileges
         shall expire unless exercised by his Successor prior to the date of its
         expiration or one (1) year from the date of the Optionee's death,
         whichever occurs first. If a non-employee director who is an Optionee
         dies while a director of the Company, any vesting of his option
         privileges shall immediately accelerate,


                                       9
<PAGE>   10

         so that all unexercised option privileges shall become immediately
         exercisable, and such option privileges shall expire unless exercised
         by his Successor, on or before the date such option expires by its
         terms.

                  (k) Other Terms. Each Stock Option Agreement may contain such
         other provisions (not inconsistent herewith) as the Board in its
         discretion may determine, including, without limitation:

                           (i) any provision which shall condition the exercise
                  of all or part of an Option upon such matters as the Board may
                  deem appropriate (if any) such as the passage of time, or the
                  attainment of certain performance goals, appropriate to
                  reflect the contribution of the Optionee to the performance of
                  the Company;

                           (ii) any provision which would accelerate the
                  exercisability of an Option upon the occurrence of a Change of
                  Control or which would give the Board the discretionary
                  authority to accelerate the exercisability of an Option in
                  spite of any provision contained in an Option pursuant to
                  clause (i) above, under such circumstances as the Board may
                  deem appropriate; and

                           (iii) the manner in which an Option is to be
                  exercised.

         7. Allotment of Shares. The grant of an Option shall not be deemed
either to entitle the Optionee to, or disqualify the Optionee from,
participation in any other grant of options under this Plan or any other stock
option plan of the Company. The number of shares allotted to each Optionee shall
be determined as follows:

                  (a) Optionees Other than Non-Employee Directors. The Board
         shall, in its discretion, determine the number of shares of Common
         Stock to be offered from time to time by grant of Options to officers
         of the Company.


                                       10
<PAGE>   11

                  (b) Non-Employee Directors. Subject to the limitations imposed
         pursuant to Section 4 of this Plan as to the aggregate number of shares
         that may be issued hereunder, each non-employee director of the
         Company, effective as of the Automatic Grant Date, shall be granted an
         Option to purchase 100,000 shares of Common Stock, subject to
         adjustment by the Board to reflect, as deemed appropriate by the Board,
         any stock dividend, stock split, reverse stock split, share
         combination, reorganization or the like, of or by the Company, at a
         price equal to 100% of the Fair Market Value of the Common Stock on the
         date of grant, for a term of ten (10) years. The eligibility of each
         non-employee director to receive a grant under this provision shall be
         determined as of the Automatic Grant Date.

         8. Adjustments. The number of shares of Common Stock covered by each
outstanding Option granted under the Plan and the option price shall be adjusted
to reflect, as deemed appropriate by the Board in its discretion, any stock
dividend, stock split, reverse stock split, share combination, exchange of
shares, recapitalization, merger, consolidation, separation, reorganization,
liquidation or the like of or by the Company. Decisions by the Board as to what
adjustments shall be made, and the extent thereof, shall be final, binding and
conclusive on all Optionees.

         9. Notices. Whenever any notice is required or permitted hereunder,
such notice must be in writing and personally delivered or sent by mail. Any
notice required or permitted to be delivered hereunder shall be deemed to be
delivered on the date which it is personally delivered, or, whether actually
received or not, on the third business day after it is deposited in the United
States mail, certified or registered, postage prepaid, addressed to the person
who is to receive it at the address which such person has theretofore specified
by written notice delivered in accordance herewith. The Company or an Optionee
may change, at any time and from time to time, by written notice to the other,
the address which


                                       11
<PAGE>   12

it or he had theretofore specified for receiving notices. Until changed in
accordance herewith, the Company and each Optionee shall specify as its and his
address for receiving notices the address set forth in the option agreement
pertaining to the shares to which such notice relates.

         10. Amendment or Discontinuance. This Plan may be amended or
discontinued by the Board without the approval of the stockholders of the
Company, provided that (a) the Board may not, except as expressly provided in
the Plan, increase the aggregate number of shares which may be issued under
Options granted pursuant to the Plan, materially amend the eligibility
requirements of the Plan or materially increase the benefits which may accrue to
participants under the Plan, without such approval (if any) as may be required
pursuant to the provisions of Rule 16b-3, or applicable law or the requirements
of any national stock exchange upon which the Company's Common Stock is traded,
and (b) the provisions of this Plan relating to the grant of options to
non-employee directors of the Company may not be amended more frequently than
once every six months, other than to comport with changes in the Internal
Revenue Code of 1986, as amended, the Employee Retirement Income Security Act of
1974, as amended, or the rules and regulations promulgated thereunder.

         11. Effect of the Plan. Neither the adoption of this Plan nor any
action of the Board shall be deemed to give any officer or director any right to
be granted an option to purchase Common Stock of the Company or any other rights
except as may be evidenced by a stock option agreement, or any amendment
thereto, duly authorized by the Board and executed on behalf of the Company and
then only to the extent and on the terms and conditions expressly set forth
therein.


                                       12


<PAGE>   1

                                                                     EXHIBIT 5.1


                       [LETTERHEAD OF JENKENS & GILCHRIST]


                                 August 10, 1999

Dallas Semiconductor Corporation
4401 South Beltwood Parkway
Dallas, Texas 75244-3292

         Re:      Dallas Semiconductor - Form S-8 Registration Statement

Gentlemen:

         We have acted as counsel to Dallas Semiconductor Corporation, a
Delaware corporation (the "Company"), in connection with the preparation of the
Registration Statement on Form S-8 (the "Registration Statement") to be filed
with the Securities and Exchange Commission on or about August 13, 1999, under
the Securities Act of 1933, as amended (the "Securities Act"), relating to
1,115,462 shares (the "Shares") of the $0.02 par value common stock (the "Common
Stock") of the Company that have been or may be issued by the Company pursuant
to the Dallas Semiconductor Corporation 1987 Stock Option Plan and 1993 Officer
and Director Stock Option Plan for the Company (the "Plans").

         You have requested the opinion of this firm with respect to certain
legal aspects of the proposed offering. In connection therewith, we have
examined and relied upon the original, or copies identified to our satisfaction,
of (1) the Certificate of Incorporation of the Company, as amended; (2) the
Bylaws of the Company, as amended; (3) minutes and records of the corporate
proceedings of the Company with respect to the establishment of the Plans, the
reservation of 1,115,462 Shares to be issued pursuant to the Plans and to which
the Registration Statement relates, the issuance of the shares of Common Stock
pursuant to the Plans and related matters; (4) the Registration Statement and
exhibits thereto, including the Plans; and (5) such other documents and
instruments as we have deemed necessary for the expression of opinions herein
contained. In making the foregoing examinations, we have assumed the genuineness
of all signatures and the authenticity of all documents submitted to us as
originals, and the conformity to original documents of all documents submitted
to us as certified or photostatic copies. As to various questions of fact
material to this opinion, and as to the content and form of the Certificate of
Incorporation, as amended, the Bylaws, as amended, minutes, records, resolutions
and other documents or writings of the Company, we have relied, to the extent
deemed reasonably appropriate, upon representations or certificates of officers
or directors of the Company and upon documents, records and instruments
furnished to us by the Company, without independent check or verification of
their accuracy.

         Based upon the firm's examination, consideration of, and reliance on
the documents and other matters described above and subject to the assumptions
noted below, this firm is of the opinion that


<PAGE>   2


Dallas Semiconductor Corporation
August 10, 1999
Page 2


the Company presently has available 1,115,462 Shares of authorized but unissued
and/or treasury shares of Common Stock which may be issued as the Shares
pursuant to the Plans. Assuming that:

         (1) the Shares to be granted in the future under the Plans will be duly
granted in accordance with the terms of the Plans;

         (2) the Company maintains an adequate number of authorized but unissued
shares and/or treasury shares available for issuance to those persons granted
Shares under the Plans; and

         (3) the consideration for the Shares issued pursuant to the Plans is
actually received by the Company as provided in the Plans and exceeds the par
value of such shares;

then, we are of the opinion that, the Shares that may be issued or sold in
accordance with the terms of the Plans will be, when and if issued, duly and
validly issued, fully paid and nonassessable.

         We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to references to us included in or made a part of the
Registration Statement. In giving this consent, we do not admit that we come
within the category of persons whose consent is required under Section 7 of the
Securities Act or the Rules and Regulations of the Securities and Exchange
Commission thereunder.

                                            Very truly yours,

                                            JENKENS & GILCHRIST,
                                            A Professional Corporation


                                            By: /s/ M. D. Sampels
                                                --------------------------------
                                                M. D. Sampels,
                                                Authorized Signatory

cc:      Mr. C.V. Prothro




<PAGE>   1


                                                                    EXHIBIT 23.2


                         CONSENT OF INDEPENDENT AUDITORS

We consent to the incorporation by reference in the Registration Statement (Form
S-8) pertaining to the Dallas Semiconductor Corporation 1987 Stock Option Plan
and 1993 Officer and Director Stock Option Plan, of our report dated January 13,
1999, with respect to the consolidated financial statements and schedule of
Dallas Semiconductor Corporation included in its Annual Report (Form 10-K) for
the year ended January 3, 1999, filed with the Securities and Exchange
Commission.

                                                  /s/ Ernst & Young LLP


Dallas, Texas
August 13, 1999



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