LATTICE SEMICONDUCTOR CORP
POS AM, 1997-11-12
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 12, 1997
                                                       REGISTRATION NO. 33-57512
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                         POST-EFFECTIVE AMENDMENT NO. 1
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
 
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                       LATTICE SEMICONDUCTOR CORPORATION
             (Exact name of Registrant as specified in its charter)
 
<TABLE>
<S>                              <C>                            <C>
           DELAWARE                                                93-0835214
 (STATE OR OTHER JURISDICTION                                   (I.R.S. EMPLOYER
     OF INCORPORATION OR                                         IDENTIFICATION
        ORGANIZATION)                                               NUMBER)
</TABLE>
 
                             5555 N.E. MOORE COURT
                          HILLSBORO, OREGON 97124-6421
                                 (503) 681-0118
 
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------
 
                               STEPHEN A. SKAGGS
                            CHIEF FINANCIAL OFFICER
                       LATTICE SEMICONDUCTOR CORPORATION
                             5555 N.E. MOORE COURT
                            HILLSBORO, OREGON 97124
                                 (503) 681-0118
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------
 
                                    COPY TO:
                               JOHN A. FORE, ESQ.
                        WILSON SONSINI GOODRICH & ROSATI
                            PROFESSIONAL CORPORATION
                               650 PAGE MILL ROAD
                              PALO ALTO, CA 94304
                                 (650) 493-9300
                            ------------------------
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF THIS REGISTRATION STATEMENT.
 
    If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, check the following box.
/ /
 
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. /X/
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. / /
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. / /
                            ------------------------
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                   PROSPECTUS
 
                       LATTICE SEMICONDUCTOR CORPORATION
 
                                 150,000 SHARES
                                  COMMON STOCK
 
    This Prospectus relates to 150,000 shares (the "Shares") of common stock,
$0.01 par value (the "Common Stock") of Lattice Semiconductor Corporation, a
Delaware corporation (the "Company"), which are issuable upon exercise of stock
purchase warrants ("Warrants") issued or to be issued to certain independent
sales representative firms (a "Sales Representative Firm") for the Company's
products and employees thereof (a "Sales Representative") pursuant to the
Company's Warrant Plan (as hereinafter defined). There are currently outstanding
Warrants to purchase 13,000 Shares at an exercise price of $34.00 per share.
Warrants granted pursuant to the Warrant Plan (as hereinafter defined) will be
exercisable at a price equal to no less than the fair market value of the Common
Stock on the date of grant of the Warrant. See "Description of Warrants."
 
    The Shares may be offered from time to time by a Sales Representative Firm,
a Sales Representative or their permitted transferees (the "Selling
Stockholders") for their own accounts at prevailing prices in the
over-the-counter market on the date of sale. The Selling Stockholders will bear
all sales commissions and similar expenses related to the sale of the Shares.
The Company will pay all expenses related to the registration of the Shares
pursuant to the Registration Statement of which this Prospectus is a part (the
"Registration Statement"). None of the Shares offered pursuant to this
Prospectus have been registered prior to the filing of the Registration
Statement.
 
    Each Selling Stockholder and any broker executing selling orders on behalf
of a Selling Stockholder may be deemed to be an "underwriter" within the meaning
of the Securities Act of 1933, as amended (the "Securities Act"), in which event
commissions received by such broker may be deemed to be underwriting commissions
under the Securities Act.
                            ------------------------
 
    All share and per share amounts have been adjusted to reflect the
three-for-two stock split effected in the form of a stock dividend which was
paid on July 6, 1993.
                            ------------------------
 
    The Common Stock of the Company is traded on the Nasdaq National Market and
is quoted under the symbol "LSCC." On November 10, 1997, the last reported sale
price of the Common Stock as reported by the Nasdaq National Market was $51 3/4
per share.
                            ------------------------
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
     EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
        SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
             COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF
                THIS PROSPECTUS. ANY REPRESENTATION TO THE
                      CONTRARY IS A CRIMINAL OFFENSE.
                            ------------------------
 
               The date of this Prospectus is November 12, 1997.
<PAGE>
    NO PERSON IS AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS, OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, IN CONNECTION
WITH THE OFFERING DESCRIBED HEREIN, AND, IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY
OR ANY SELLING STOCKHOLDER. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO
SELL, OR A SOLICITATION OF AN OFFER TO BUY, NOR SHALL THERE BE ANY SALE OF THESE
SECURITIES BY ANY PERSON IN ANY JURISDICTION IN WHICH IT IS UNLAWFUL FOR SUCH
PERSON TO MAKE SUCH OFFER, SOLICITATION OR SALE. NEITHER THE DELIVERY OF THIS
PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL UNDER ANY CIRCUMSTANCES CREATE AN
IMPLICATION THAT THE INFORMATION CONTAINED HEREIN IS CORRECT AS OF ANY TIME
SUBSEQUENT TO THE DATE HEREOF.
 
                             AVAILABLE INFORMATION
 
    The Company hereby undertakes to provide without charge to each person to
whom a copy of this Prospectus is delivered, upon written or oral request of any
such person, a copy of any and all of the information that has been or may be
incorporated by reference in this Prospectus, other than exhibits to such
documents. Requests for such copies should be directed to the Company's Chief
Financial Officer at 5555 N.E. Moore Court, Hillsboro, Oregon 97124-6421. The
Company's telephone number at that location is (503) 681-0118.
 
    The Company is subject to the informational reporting requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files reports, proxy statements and other information with
the Securities and Exchange Commission (the "SEC"). Such reports, proxy
statements and other information can be inspected and copied at the Public
Reference Room of the SEC, Room 1024, 450 Fifth Street, N.W., Judiciary Plaza,
Washington, D.C. 20549 and at the SEC's regional offices at Northwestern Atrium
Center, 500 West Madison Street, Suite 1400, Chicago, IL 60661 and Seven World
Trade Center, 13th Floor, New York, NY 10048; and copies of such material can be
obtained from the Public Reference Section of the SEC, Room 1024, 450 Fifth
Street, N.W., Washington, D.C. 20549, at prescribed rates. The Common Stock is
traded on the Nasdaq National Market. The foregoing materials should also be
available for inspection at the National Association of Securities Dealers,
Inc., 9513 Key West Avenue, Rockville, MD 20850. The SEC maintains a World Wide
Web site that contains reports, proxy and information statements and other
information regarding registrants that file electronically with the SEC. The
address of that site is http://www.sec.gov.
                            ------------------------
 
    This Prospectus contains information concerning Lattice Semiconductor
Corporation and the sale of its Common Stock by the Selling Stockholders, but
does not contain all the information set forth in the Registration Statement
which the Company has filed with the SEC under the Securities Act. The
Registration Statement, including various exhibits, may be inspected at the
SEC's office in Washington, D.C.
 
                                       2
<PAGE>
                                  THE COMPANY
 
    Lattice Semiconductor Corporation was incorporated in Oregon in 1983 and
reincorporated in Delaware in 1985. Its principal executive offices are located
at 5555 N.E. Moore Court, Hillsboro, Oregon 97124-6421 and its telephone number
at that location is (503) 681-0118. The Common Stock of the Company is traded on
the Nasdaq National Market and is quoted under the symbol "LSCC."
 
                            DESCRIPTION OF WARRANTS
 
    ALL SHARE AND PER SHARE AMOUNTS HAVE BEEN ADJUSTED TO REFLECT THE
THREE-FOR-TWO STOCK SPLIT EFFECTED IN THE FORM OF A STOCK DIVIDEND WHICH WAS
PAID ON JULY 6, 1993.
 
GENERAL
 
    The Shares offered by this Prospectus are issuable upon the exercise of
Warrants issued or issuable pursuant to the Warrant Plan (as hereinafter
defined) to Sales Representative Firms and Sales Representatives. The Fiscal
1992 Sales Representative Warrant Plan (the "1992 Warrant Plan") was adopted by
the Board of Directors of the Company in May 1991 and 150,000 shares of Common
Stock have been reserved for issuance thereunder. From fiscal year 1992 through
fiscal year 1997, the Board of Directors granted Warrants to purchase an
aggregate of 33,409 shares of the Common Stock, of which Warrants to purchase
697 shares of the Common Stock were forfeited. In May 1996, the Board of
Directors subsequently amended and restated the 1992 Warrant Plan (as amended
and restated effective May 13, 1996, the "Warrant Plan"). As of the end of the
first quarter of fiscal year 1998, Warrants to purchase 32,712 shares of the
Common Stock had been exercised. As of the date of this Prospectus, there are
outstanding Warrants to purchase an aggregate of 13,000 shares of the Company's
Common Stock at an exercise price of $34.00 per share. These outstanding
Warrants expire May 13, 1999 and are fully exercisable. Upon exercise of a
Warrant, the exercise price must be paid in cash, certified check or cashier's
check or a combination thereof. There are an aggregate of 104,288 Warrant shares
available for future grants under the Warrant Plan.
 
    The Warrant Plan permits the Board of Directors or its appointed committee
to grant Warrants to Sales Representative Firms and Sales Representatives. The
Warrants may have a maximum term of three (3) years and a minimum exercise price
equal to the fair market value of the Common Stock on the date of grant of the
Warrant. The Warrant Plan will terminate June 30, 1999 unless sooner terminated
by the Board of Directors.
 
CANCELLATION OF WARRANTS
 
    If a Sales Representative Firm or Sales Representative to which a Warrant
was originally issued should for any reason cease to be an authorized Sales
Representative Firm or an employee thereof, the Warrant issued to such entity or
individual shall immediately be cancelled as to any and all shares subject
thereto which remain unexercised at the date of such termination as a Sales
Representative or Sales Representative Firm. Such shares shall return to the
Warrant Plan and become available for future grant. Nothing in the Warrant or
the Warrant Plan shall confer upon any Sales Representative Firm or Sales
Representative any right with respect to continuation of a Sales
Representative's employment by the Sales Representative Firm, nor shall it
interfere in any way with the Company's right to terminate a Sales
Representative Firm at any time.
 
LIMITED TRANSFERABILITY OF WARRANTS
 
    A Warrant may not be transferred without the prior written consent of the
Company except by a Sales Representative Firm to one or more of its employees
who are Sales Representatives, or to the spouse or child of such an employee or
to a trust for their sole benefit or to the estate of any such deceased
employee, subject to compliance with all applicable laws. Warrants may be
exercised only by a Sales Representative Firm or a Sales Representative or by
their permitted transferees (a "Warrantholder"). In
 
                                       3
<PAGE>
addition, a Warrant may not be transferred unless the Company receives a legal
opinion stating that the transfer is exempt from registration under the
Securities Act and relevant state securities laws and a written representation
from the proposed transferee containing appropriate statements of investment
intent.
 
CHANGES IN CAPITALIZATION
 
    The exercise price of the Warrants and the number of shares of Common Stock
issuable upon exercise of a Warrant will be proportionately adjusted to reflect
any stock split, stock dividend or like event affecting the Common Stock.
 
MERGER, SALE OF ASSETS OR LIQUIDATION
 
    In the event of the proposed dissolution or liquidation of the Company, or
the proposed sale of substantially all of the assets of the Company, or the
proposed merger of the Company with or into another corporation, the Warrant
will terminate effective upon the consummation of such transaction, unless
otherwise provided by the Board. The Board may, in its sole discretion, declare
that any Warrant shall terminate as of a date fixed by the Board and give each
Warrantholder the right to exercise his or her Warrant as to all or any part of
the Shares, including Shares as to which the Warrant would not otherwise be
exercisable.
 
                                USE OF PROCEEDS
 
    The proceeds received by the Company upon exercise of the Warrants from time
to time will be used for general working capital purposes.
 
                          PRICE RANGE OF COMMON STOCK
 
    The following table sets forth the range of high and low sale prices of the
Company's Common Stock for the indicated periods, as reported by the Nasdaq
National Market. On November 10, 1997, the last reported sale price of the
Common Stock on the Nasdaq National Market was $51 3/4 per share. As of November
7, 1997, the Company had approximately 325 holders of record of the Common
Stock. All prices have been restated to reflect a three-for-two stock split
effected in the form of a stock dividend which was paid on July 6, 1993.
 
<TABLE>
<CAPTION>
                                                                                                       HIGH        LOW
                                                                                                      -------    -------
<S>                                                                                                   <C>        <C>
Fiscal year ended March 30, 1996:
  First Quarter....................................................................................   $37 1/8    $23
  Second Quarter...................................................................................    43         28 7/8
  Third Quarter....................................................................................    42 1/8     27 5/8
  Fourth Quarter...................................................................................    37 3/8     26 3/8
Fiscal year ended March 29, 1997:
  First Quarter....................................................................................    36 1/4     21 5/8
  Second Quarter...................................................................................    31 1/2     19 3/4
  Third Quarter....................................................................................    47         27 1/2
  Fourth Quarter...................................................................................    54 7/8     39 3/4
Fiscal year ending March 28, 1998:
  First Quarter....................................................................................    62 5/8     41 1/2
  Second Quarter...................................................................................    74 1/2     54 7/8
  Third Quarter (through November 10, 1997)........................................................    67 1/2     45
</TABLE>
 
                                DIVIDEND POLICY
 
    To date the Company has not declared or paid cash dividends on its Common
Stock. The Board of Directors of the Company presently intends to retain all
earnings for use in the Company's business and
 
                                       4
<PAGE>
therefore does not anticipate declaring or paying any cash dividends on its
Common Stock in the foreseeable future.
 
                              PLAN OF DISTRIBUTION
 
    The Warrants may be issued from time to time by the Board of Directors
pursuant to the terms of the Warrant Plan.
 
    The Warrantholders may sell all or a portion of the Shares from time to time
in the Nasdaq National Market at prices prevailing in the public market at the
times of such sales. The Warrantholders may also make private sales directly or
through a broker or brokers, who may act as agent or as principal. In connection
with any sales, the Warrantholders and any brokers participating in such sales
may be deemed to be underwriters within the meaning of the Securities Act. Any
broker-dealer participating in such transactions as agent may receive
commissions from the Warrantholders (and from any purchaser of shares in such
transaction). Usual and customary brokerage fees will be paid by the
Warrantholder.
 
    There can be no assurances that the Warrantholders will sell any or all of
the Shares of Common Stock offered hereunder or that the Board of Directors will
approve the issuance of any Warrants other that the Warrants outstanding as of
the date of this Prospectus.
 
                     INFORMATION INCORPORATED BY REFERENCE
 
    There are hereby incorporated by reference in this Prospectus the following
documents and information heretofore filed with the SEC:
 
    (a) The Company's Annual Report on Form 10-K for the fiscal year ended March
29, 1997, filed pursuant to Section 13(a) or 15(d) of the Exchange Act.
 
    (b) The Company's Quarterly Report on Form 10-Q for the fiscal quarter ended
June 28, 1997, filed pursuant to Section 13(a) or 15(d) of the Exchange Act.
 
    (c) The Company's Quarterly Report on Form 10-Q for the fiscal quarter ended
September 27, 1997, filed pursuant to Section 13(a) or 15(d) of the Exchange
Act.
 
    (d) The description of the Company's Common Stock which is contained in the
Company's Registration Statement on Form 8-A filed with the SEC on September 27,
1989, pursuant to Section 12 of the Exchange Act, including any amendment or
report filed for the purpose of updating any such description.
 
    (e) The description of the preferred stock purchase rights of the Company
contained in the Company's Registration Statement in Form 8-A filed with the SEC
on September 13, 1991.
 
    All documents subsequently filed by the Company pursuant to Sections 13(a),
13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a post-effective
amendment which indicates that all securities registered 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.
 
                                    EXPERTS
 
    The consolidated financial statements incorporated in this Prospectus by
reference to the Annual Report on Form 10-K of Lattice Semiconductor Corporation
for the year ended March 29, 1997 have been so incorporated in reliance on the
report of Price Waterhouse LLP, independent accountants, given on the authority
of said firm as experts in auditing and accounting.
 
                                 LEGAL MATTERS
 
    The validity of the issuance of the Common Stock offered hereby has been
passed upon for the Company by Wilson Sonsini Goodrich & Rosati, Professional
Corporation, Palo Alto, California.
 
                                       5
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
<TABLE>
<S>                                                               <C>
SEC registration fee............................................  $          0
Fees and expenses of counsel....................................      7,500.00
Fees and expenses of accountants................................      1,500.00
Blue sky fees and expenses......................................      1,500.00
Miscellaneous...................................................        300.00
                                                                  ------------
  Total.........................................................  $  10,800.00
                                                                  ------------
                                                                  ------------
</TABLE>
 
    Except for the SEC registration fee, all of the foregoing expenses have been
estimated. All of the above expenses will be paid by the Registrant.
 
ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
    The Registrant's Certificate of Incorporation (the "Certificate") limits, to
the maximum extent permitted by Delaware law, the personal liability of
directors for monetary damages for their conduct as a director. The Registrant's
Bylaws provide that the Registrant shall indemnify its officers and directors
and may indemnify its employees and other agents to the fullest extent permitted
by law.
 
    Section 145 of the Delaware General Corporation Law ("Delaware Law")
provides that a corporation may indemnify a director, officer, employee or agent
made a party to an action by reason of the fact that he was a director, officer,
employee or agent of the corporation or was serving at the request of the
corporation against expenses actually and reasonably incurred by him in
connection with such action if he acted in good faith and in a manner he
reasonably believed to be in, or not opposed to, the best interests of the
corporation and with respect to any criminal action, had no reasonable cause to
believe his conduct was unlawful.
 
    Delaware Law does not permit a corporation to eliminate a director's duty of
care, and the provisions of the Certificate have no effect on the availability
of equitable remedies such as injunction or rescission, based upon a director's
breach of the duty of care. Insofar as indemnification for liabilities arising
under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), may
be permitted to foregoing provisions and agreements, the Registrant has been
informed that in the opinion of the staff of the SEC such indemnification is
against public policy as expressed in the Exchange Act and is therefore
unenforceable.
 
ITEM 16.  EXHIBITS.
 
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER                                                   DESCRIPTION
- -----------  --------------------------------------------------------------------------------------------------------
<C>          <S>
       4.1   Fiscal 1992 Sales Representative Warrant Plan (As Amended and Restated Effective May 13, 1996).
       4.2   Form of Sales Representative Warrant Agreement.
       5.1   Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation, counsel to the Registrant.
      24.1   Consent of Price Waterhouse LLP, Independent Public Accountants.
      24.2   Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (included in Exhibit 5.1).
      25.1   Power of attorney (see page II-3).
</TABLE>
 
                                      II-1
<PAGE>
ITEM 17.  UNDERTAKINGS.
 
    (a) The 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 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-2
<PAGE>
                                   SIGNATURES
 
    Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Post-Effective
Amendment No. 1 to Form S-3 Registration Statement to be signed on its behalf by
the undersigned, thereunto duly authorized, in the City of Hillsboro, State of
Oregon, on this 10th day of November, 1997.
 
<TABLE>
<S>                             <C>  <C>
                                LATTICE SEMICONDUCTOR CORPORATION
 
                                By:              /s/ CYRUS Y. TSUI
                                     -----------------------------------------
                                                   Cyrus Y. Tsui
                                       PRESIDENT, CHIEF EXECUTIVE OFFICER AND
                                               CHAIRMAN OF THE BOARD
</TABLE>
 
                               POWER OF ATTORNEY
 
    KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below hereby constitutes and appoints Cyrus Y. Tsui and Stephen A. Skaggs, and
each of them acting individually, as his or her attorney-in-fact, each with full
power of substitution, for him or her in any and all capacities, to sign any and
all amendments to this Post-Effective Amendment No. 1 to Form S-3 Registration
Statement, 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 any
substitute, may do or cause to be done by virtue hereof.
 
    Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment No. 1 to Form S-3 Registration Statement has been
signed by the following persons in the capacities and on the dates indicated:
 
          SIGNATURE                       TITLE                    DATE
- ------------------------------  --------------------------  -------------------
      /s/ CYRUS Y. TSUI         President, Chief Executive   November 10, 1997
- ------------------------------    Officer (Principal
        Cyrus Y. Tsui             Executive Officer) and
                                  Chairman of the Board of
                                  Directors
 
    /s/ STEPHEN A. SKAGGS       Senior Vice President,       November 10, 1997
- ------------------------------    Chief Financial Officer
      Stephen A. Skaggs           (Principal Financial
                                  Officer) and Secretary
 
     /s/ MARK O. HATFIELD                                    November 10, 1997
- ------------------------------  Director
       Mark O. Hatfield
 
     /s/ DANIEL S. HAUER                                     November 10, 1997
- ------------------------------  Director
       Daniel S. Hauer
 
      /s/ HARRY A. MERLO                                     November 10, 1997
- ------------------------------  Director
        Harry A. Merlo
 
     /s/ LARRY W. SONSINI                                    November 10, 1997
- ------------------------------  Director
       Larry W. Sonsini
 
    /s/ DOUGLAS C. STRAIN                                    November 10, 1997
- ------------------------------  Director
      Douglas C. Strain
 
                                      II-3
<PAGE>
                       LATTICE SEMICONDUCTOR CORPORATION
       POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-3 REGISTRATION STATEMENT
 
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
  EXHIBIT                                                                                                 SEQUENTIALLY
  NUMBER                                             DESCRIPTION                                          NUMBERED PAGE
- -----------  -------------------------------------------------------------------------------------------  -------------
<C>          <S>                                                                                          <C>
       4.1   Fiscal 1992 Sales Representative Warrant Plan (As Amended and Restated Effective May 13,
               1996).
 
       4.2   Form of Sales Representative Warrant Agreement.
 
       5.1   Opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation, counsel to the
               Registrant.
 
      24.1   Consent of Price Waterhouse LLP, Independent Public Accountants.
 
      24.2   Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (included in Exhibit
               5.1).
 
      25.1   Power of attorney (see page II-3).
</TABLE>

<PAGE>
                                                                     EXHIBIT 4.1
 
                       LATTICE SEMICONDUCTOR CORPORATION

                 FISCAL 1992 SALES REPRESENTATIVE WARRANT PLAN

                (AS AMENDED AND RESTATED EFFECTIVE MAY 13, 1996)
 
    1.    PURPOSES OF THE PLAN.  The purposes of this Fiscal 1992 Sales
Representative Warrant Plan (As Amended and Restated Effective May 13, 1996) are
to provide Sales Representatives of the Company with a differentiating incentive
to sell the Company's products, to give them a long-term stake in the future of
the Company and to provide additional incentive to promote the success of the
Company's business in general.
 
    2.  DEFINITIONS.  As used herein, the following definitions shall apply:
 
        (a) "AUTHORIZED SALES REPRESENTATIVE FIRM" shall mean a 
currently authorized manufacturer's representative firm, as designated by 
the Company in its sole discretion. The Company may at any time 
withdraw such authorization for any reason or no reason.
 
        (b) "BOARD" shall mean the Board of Directors of the Company and 
(other than for purposes of paragraph (a) of Section 4 of the Plan) the 
Committee, if one has been appointed.
 
        (c) "COMMON STOCK" shall mean the Common Stock, $.01 par value, of 
the Company.
 
        (d) "COMPANY" shall mean Lattice Semiconductor Corporation, a 
Delaware corporation.
 
        (e) "COMMITTEE" shall mean the Committee appointed by the Board 
in accordance with paragraph (a) of Section 4 of the Plan, if one is 
appointed.
 
        (f) "PLAN" shall mean this Fiscal 1992 Sales Representative Warrant 
Plan (As Amended and Restated Effective May 13, 1996).
 
        (g) "SALES REPRESENTATIVE" shall mean any person who is employed by 
an Authorized Sales Representative Firm to perform services which include 
the sale of the Company's products.
 
        (h) "SHARE"  shall mean  a share  of the  Common Stock,  as adjusted  
in accordance with Section 11 of the Plan.
 
        (i) "UNDERLYING STOCK" shall mean the Common Stock subject to a Warrant.

<PAGE>

 
        (j)  "WARRANT" shall  mean a  warrant to  purchase Common  Stock 
granted pursuant to the Plan.
 
        (k) "WARRANTHOLDER" shall mean  an Authorized Sales Representative  
Firm or a Sales Representative who holds a Warrant.
 
    3.   STOCK SUBJECT TO THE PLAN.  Subject to the provisions of Section 11 
of the Plan, the maximum aggregate number of shares which may be granted 
subject to Warrants and sold under the Plan is 150,000 shares of Common 
Stock. The Shares may be authorized but unissued or reacquired Common Stock.
 
    If a Warrant should  expire or become unexercisable for any reason 
without having been exercised in full, the unpurchased shares which were 
subject thereto shall, unless the Plan shall have been terminated, become 
available for other Warrants under the Plan.
 
    4.  ADMINISTRATION OF THE PLAN.
 
        (a) PROCEDURE. The Plan shall be administered by the Board of Directors.
 
    The Board of Directors may appoint a Committee consisting of (1) not less 
than two members of the Board of Directors or (2) one or more officers of the 
Company, to administer the Plan on behalf of the Board, subject to such terms 
and conditions as the Board of Directors may prescribe. Once appointed, the 
Committee shall continue to serve until otherwise directed by the Board of 
Directors. From time to time the Board of Directors may increase the size of 
the Committee and appoint additional members thereof, remove members (with or 
without cause), and appoint new members in substitution therefor, fill 
vacancies however caused, or remove all members of the Committee and 
thereafter directly administer the Plan.
 
       (b) POWERS OF THE BOARD. Subject to the provisions of the Plan, the
Board shall have the authority, in its discretion: (i) to determine, upon
review of relevant information and in accordance with paragraph (b) of
Section 8 of the Plan, the fair market value of the Common Stock; (ii) to
determine the exercise price per Share of Warrants to be granted, which
exercise price shall in no event be less than the fair market value per
Share of Common Stock on the date of grant of the Warrant, (iii) to
determine  the  Authorized  Sales  Representative  Firms  and  Sales
Representatives to which, and the time or times at which, Warrants shall be
granted and the number of shares to be represented by each Warrant; (iv) to
interpret the Plan; (v) to prescribe, amend and rescind rules  and
regulations relating to the Plan; (vi) to determine the terms and provisions
of each Warrant granted (which need not be identical) and, with the consent
of the holder thereof, modify or amend each Warrant; (vii) to accelerate the
exercise date of any Warrant; (viii) to authorize any person to execute on
behalf of the Company any instrument required to effectuate the grant of a
Warrant previously granted by the Board; (ix) in the event of a merger or
other acquisition whereby all of the Company's capital stock is acquired for
cash, to substitute cash for stock upon exercise of the Warrant in an amount
equal to the amount per share received by the Company for each share of its
Common Stock in the merger or acquisition times the number of shares of
Common 

                                       -2-

<PAGE>

Stock for which the Warrant is exercised less the Warrant exercise price; and 
(x) to make all other determinations deemed necessary or advisable for the 
administration of the Plan.
 
        (c) EFFECT OF BOARD'S DECISION. All decisions, determinations and 
interpretations of the  Board shall  be final and  binding on  all 
Warrantholders and any other holders of any Warrants.
 
    5.  ELIGIBILITY.  Warrants may be granted only to Authorized Sales 
Representative Firms  and  Sales  Representatives.  An  Authorized  Sales 
Representative Firm or Sales Representative which has been granted a Warrant 
may, if otherwise eligible, be granted an additional Warrant or Warrants.
 
        The Plan shall not confer upon any Warrantholder any right with respect
to continuation of a Sales Representative's employment by the Authorized 
Sales Representative Firm, nor shall it interfere in any way with the 
Company's right to terminate an Authorized Sales Representative Firm as such 
at any time.
 
    6.  TERM OF PLAN. The Plan shall become effective upon its adoption by 
the Board of Directors. It shall continue in effect until June 30, 1999 
unless sooner terminated under Section 13 of the Plan.
 
    7.  TERM OF WARRANT.  The term of each Warrant shall be the lesser of (a) 
the balance of the term of this Plan and (b) three (3) years from the date of 
grant thereof, or such shorter term as may be provided in the warrant 
agreement.
 
    8.  EXERCISE PRICE AND CONSIDERATION.
 
        (a) EXERCISE PRICE. The per Share exercise price for the Shares to be 
issued pursuant to a Warrant shall be such price as is determined by the 
Board, but shall in no event be less than the fair market value per Share on 
the date of grant of the Warrant.
 
        (b) DETERMINATION OF FAIR MARKET VALUE. The fair market value shall 
be determined by the Board in its discretion; provided, however, that where 
there is a public market for the Common Stock, the fair market value per 
Share shall be the mean of the reported bid and asked prices for the Common 
Stock as of the date of grant, or, in the event the Common Stock is listed on 
a stock exchange or on the Nasdaq National Market, the fair market value per 
Share shall be the closing price on the exchange as of the date of grant of 
the Warrant.
 
        (c) FORM OF CONSIDERATION. The consideration to be paid for the Shares
to be issued upon exercise of a Warrant shall consist of cash or a certified
or cashier's check (or any combination thereof).

                                       -3-

<PAGE>

    9.  EXERCISE OF WARRANT.
 
        (a) EXERCISABILITY; PROCEDURE FOR EXERCISE; RIGHTS AS A SHAREHOLDER. 
Any Warrant granted hereunder shall be exercisable at such times and under  
such conditions  as determined by the  Board, including performance criteria 
with respect to the Company and/or the Warrantholder, and as shall be 
permissible under the terms of the Plan.
 
        A Warrant may not be exercised for a fraction of a Share.
 
        A Warrant 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 
Warrant by the person entitled to exercise the Warrant and full payment for 
the Shares with respect to which the Warrant is exercised has been received 
by the Company. 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 Underlying Stock, notwithstanding the exercise of the Warrant. 
No adjustment will be made for a dividend or other right for which the record 
date is prior to the date the stock certificate is issued, except as provided 
in Section 11 of the Plan.
 
        Exercise of a Warrant in any manner shall result in a decrease in the 
number of Shares which thereafter may be available, both for purposes of the 
Plan and for sale under the Warrant, by the number of Shares as to which the 
Warrant is exercised.
 
        (b)  TERMINATION OF STATUS AS A SALES REPRESENTATIVE. If a 
Warrantholder ceases to  serve as  an  Authorized Sales  Representative  Firm 
or  a  Sales Representative,  as the case may be, for any reason or no 
reason, either due to the death or disability of the Warrantholder, 
termination of a firm which is a Warrantholder as an Authorized Sales 
Representative Firm or termination of the  individual  Warrantholder's  
employment  with  an  Authorized  Sales Representative Firm, the right to 
exercise Warrant shall terminate.
 
    10.  TRANSFERABILITY  OF  WARRANTS.    A  Warrant  may  not  be  sold, 
pledged, assigned, hypothecated, transferred, or  disposed of in  any manner 
without  the prior  written  consent  of  the  Company. Warrants  may  be  
exercised  only by Warrantholders.
 
    11.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION OR MERGER.  Subject to 
any required action by the shareholders of the Company, the number of shares 
of Common Stock covered by each outstanding Warrant, and the number of shares 
of Common Stock which have been authorized for issuance under the Plan but as 
to which no Warrants have yet been granted or which have been returned to the 
Plan upon cancellation of a Warrant (collectively, the "Reserves"), as well 
as the price per share of Common Stock covered by each such outstanding 
Warrant, shall be proportionately adjusted for any increase or decrease in 
the number of issued shares of Common Stock resulting from a stock split or 
the payment of a stock dividend (but only on the Common Stock) or any other 
increase or decrease in the number of such 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 

                                       -4-

<PAGE>

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 issue  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 a Warrant or the Reserves.
 
    In the event of the proposed dissolution or liquidation of the Company, 
or the proposed sale of substantially all of the assets of the Company, or 
the proposed merger of the Company with or into another corporation, the 
Warrant will terminate effective upon the consummation of such transaction, 
unless otherwise provided by the Board. The Board may, in the exercise of its 
sole discretion in such instances, declare that any Warrant shall terminate 
as of a date fixed by the Board and give each Warrantholder the right to 
exercise his Warrant as to all or any part of the Shares, including Shares as 
to which the Warrant would not otherwise be exercisable.
 
    12.   TIME OF GRANTING WARRANTS.  The date of grant of a Warrant shall, for
all purposes, be the date on which the Board makes the determination granting
such Warrant. Notice of the determination shall be given to each Authorized
Sales Representative Firm or Sales Representative, as the case may be, to which
a Warrant is so granted within a reasonable time after the date of such grant.
 
    13.   AMENDMENT AND TERMINATION.  The Board may amend or terminate the Plan
from time to time in such respects as the Board may deem advisable; provided
that any such amendment or termination of the Plan which would have an adverse
effect on any Warrants already granted shall not affect such Warrants and such
Warrants shall remain in full force and effect as if this Plan had not been
amended or terminated, unless such amendment or termination is consented to by
the holders of any such Warrant which would be so affected thereby.
 
    14.   CONDITIONS UPON TRANSFER OF WARRANTS AND ISSUANCE OF SHARES.  Warrants
shall not be issued upon transfer, nor shall Shares be issued upon exercise of a
Warrant unless such transfer or exercise and the issuance and delivery of such
Warrant or Shares pursuant thereto shall comply with all relevant provisions of
law, 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 automated quotation system
or 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 transfer or exercise of a Warrant, the Company may
require the transferee or the person exercising such Warrant to represent and
warrant at the time of any such transfer or exercise that the Warrant or Shares
are being acquired only for investment and without any present intention to sell
or distribute the same if, in the opinion of counsel for the Company, such a
representation is required by any of the aforementioned relevant provisions of
law.
 
    15.  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.

                                       -5-

<PAGE>

 
    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 Warrants or Shares hereunder,
shall relieve the Company of any liability in respect of the failure to issue or
sell such Warrants or Shares as to which such requisite authority shall not have
been obtained.
 
    16.   WARRANT AGREEMENT.   Warrants shall be evidenced by written warrant
agreements in such form as the Board shall approve.

                                       -6-




<PAGE>
                                                                     EXHIBIT 4.2
 
                                FORM OF WARRANT
 
       THE SECURITIES REPRESENTED BY THIS WARRANT AND THE COMMON STOCK ISSUABLE
       UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
       1933, AS AMENDED, AND HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A
       VIEW TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. SUCH
       SECURITIES MAY NOT BE SOLD OR TRANSFERRED IN THE ABSENCE OF SUCH
       REGISTRATION UNLESS THE COMPANY RECEIVES AN OPINION OF COUNSEL REASONABLY
       ACCEPTABLE TO IT STATING THAT SUCH SALE OR TRANSFER IS EXEMPT FROM THE
       REGISTRATION AND PROSPECTUS DELIVERY REQUIREMENTS OF SAID ACT. TRANSFER
       OF THIS WARRANT AND THE COMMON STOCK ISSUABLE UPON EXERCISE THEREOF IS
       ALSO SUBJECT TO CONTRACTUAL RESTRICTIONS AS DESCRIBED HEREIN.
 
                       LATTICE SEMICONDUCTOR CORPORATION

                     SALES REPRESENTATIVE WARRANT AGREEMENT
 
    Lattice Semiconductor Corporation, a Delaware corporation (the 
"Company"), hereby grants to _________________________ (the 
"Warrantholder") a Warrant to purchase a total of __________ shares of 
Common Stock, $.01 par value, of the Company, at the price set forth 
herein, and in all respects subject to the terms, definitions and 
provisions of the Fiscal 1992 Sales Representative Warrant Plan (As 
Amended and Restated Effective May 13, 1996) (the "Plan") adopted by the 
Company, which is incorporated herein by reference.
 
    1.  NATURE OF THE WARRANT.   This Warrant is intended to be a non-statutory
option and NOT an incentive stock option within the meaning of Section 422A of
the Internal Revenue Code of 1986, as amended. The Warrantholder is not an
employee of the Company.
 
    2.   EXERCISE PRICE.  The exercise price is $________ for each share of 
Common Stock, which price is not less than the fair market value per share of 
Common Stock, as determined by the Board, on the date of grant set forth 
below.
 
    3.  EXERCISE OF WARRANT.   The Warrant shall be exercisable in accordance
with the provisions of Section 9 of the Plan as follows:
 
    (a) RIGHT TO EXERCISE.

<PAGE>
 
            (i)  Subject to compliance with the other provisions hereof, 
this Warrant shall be exercisable in part or in full at any time during 
its term.
 
           (ii)  This Warrant may not be exercised for a fraction of a share.
 
          (iii)  In the event of Warrantholder's termination as an 
Authorized Sales Representative Firm or as a Sales Representative, as the 
case may be, for any reason, the Warrant shall terminate immediately.
 
           (iv)  This Warrant may be exercised only by the Warrantholder or, 
in the event of a transfer of this Warrant in compliance with the terms 
hereof, by such Warrantholder's permitted transferee.
 
        (b)  METHOD OF EXERCISE. This Warrant shall be exercisable by 
written notice which shall state the election to exercise the Warrant, the 
number of shares in respect of which this Warrant is being exercised, and 
such other representations and agreements as to the holder's investment 
intent with respect to such shares of Common Stock as may be required by 
the Company. Such written notice shall be signed by the Warrantholder 
and shall be delivered in person or by certified mail to the Company. The 
written notice shall be accompanied by payment of the purchase price.  
The certificate or certificates for shares of Common Stock as to which this 
Warrant shall be exercised shall be registered in the name of the 
Warrantholder.
 
        (c) RESTRICTIONS ON EXERCISE. This Warrant may not be exercised if 
the issuance of any shares upon such exercise would constitute a violation 
of any applicable federal or state securities laws or any other laws 
or regulations. As a condition to the exercise of this Warrant, the Company 
may require the Warrantholder to make such representations and warranties to 
the Company as may be required by any applicable law or regulation at the 
time of exercise of this Warrant.
 
        (d) METHOD OF PAYMENT. Payment of the aggregate exercise price shall 
be by any of the following, or a combination thereof, at the election of 
the Warrantholdexr:
 
           (i) cash; or
 
          (ii) cashier's or certified check.
 
    4.  TRANSFERABILITY OF WARRANT.   This warrant may not be transferred 
other than with the prior written consent of the Company and subject to 
compliance with all applicable laws. Transfer of this Warrant will 
not under any circumstances be permitted unless the Company first 
receives and approves both of the following:
 
        (a) An attorney's written opinion that the transfer is exempt 
from registration under the Securities Act of 1933, as amended (the 
"Securities Act") and under the securities law of the state of residence of 
the proposed transferee. This opinion must (i) set forth the facts upon 
which it is based, 

                                       -2-

<PAGE>

(ii) be from a law firm experienced in securities law matters and 
satisfactory to the Company and its counsel, and (iii) be in form and 
substance satisfactory to the Company and its counsel.
 
        (b)  A letter from the proposed transferee addressed to the 
Company stating that (i) he is acquiring the Warrant for investment; (ii) 
he will not offer, sell or otherwise dispose of the Warrant or any stock 
issued upon exercise of the Warrant, except under circumstances that will 
not violate federal or state securities laws; (iii) he agrees to be bound by 
the terms of this warrant agreement as if he were a party thereto 
(as the Warrantholder), and (iv) he understands that the Warrant is 
restricted from transfer under the terms of the Warrant and will bear a 
legend noting the restriction. The transferee will also have to include 
any additional representations relied on by his attorney's opinion.
 
    The terms of this Warrant shall be binding upon the executors,
administrators, heirs, successors and assigns of the Warrantholder.
 
    5.  TERM OF WARRANT.  This Warrant may not be exercised more than three (3)
years from the date of grant of this Warrant, and may be exercised during such
term only in accordance with the Plan and the terms of this Warrant.
 
    6.  WARRANTHOLDER INVESTMENT REPRESENTATIONS.

    In connection with the grant of this Warrant and any exercise thereof, 
the Warrantholder represents to the Company the following:
 
        (a) He is acquiring this  Warrant for his own account for 
investment purposes only and not with a view to, or for the resale in 
connection with, any "distribution" thereof for purposes of the Securities 
Act.
 
        (b) He understands that this Warrant and the Common Stock issuable 
upon the  exercise thereof (collectively, the "Securities") have not 
been registered under the Securities Act in reliance upon a specific 
exemption therefrom, which exemption depends upon, among other things, the 
bona fide nature of his investment intent as expressed herein.
 
        (c) He further understands that the Securities must be held 
indefinitely unless subsequently registered under the Securities Act or 
unless an exemption from registration is otherwise available. Moreover, 
except as set forth in Section 8 hereof, he understands that the Company 
is under no obligation to register the Securities. In addition, he 
understands that the certificate evidencing the Common Stock issued upon 
exercise of the Warrant will be imprinted with a legend in substantially 
the form set forth in paragraph (c) of Section 8 hereof.

        (d) He is aware of the provisions of Rule 144, promulgated under 
the Securities Act, as currently in effect, which, in substance, permits 
limited public resale of "restricted securities" acquired, directly or 
indirectly, from the issuer thereof (or from an affiliate of such 
issuer), in a non-public offering subject to the satisfaction of 
certain conditions, including, among other things: (i) the resale occurring 
not less than one year after the party has purchased and paid for the 
securities to be sold; (ii) the 

                                       -3-

<PAGE>

availability of certain public information about the Company; (iii) the sale 
being made through a broker in an unsolicited "broker's transaction" or in 
transactions directly with a market maker (as said term is defined under the 
Securities Exchange Act of 1934); and (iv) the amount of securities being 
sold during any three month period not exceeding the specified limitations 
stated therein.
 
        (e) He further understands that in the event all of the 
applicable requirements of Rule 144, as in effect at the time of 
sale, are not satisfied, registration under the Securities Act, compliance 
with Regulation A, or some other registration exemption will be 
required; and that, notwithstanding the fact that Rule 144 is not 
exclusive, the Staff of the Securities and Exchange Commission has 
expressed its opinion that persons proposing to sell private placement 
securities other than in a registered offering and otherwise than pursuant 
to Rule 144 will have a substantial burden of proof in establishing 
that an exemption from registration is available for such offers or 
sales, and that such persons and their respective brokers who 
participate in such transactions do so at their own risk.
 
    7.   DISCLAIMER.   This warrant agreement is NOT a sales representative
contract and nothing herein shall be construed to create any obligation on the
part of the Company to continue the Warrantholder as an Authorized Sales
Representative Firm or as a Sales Representative, as the case may be.
 
    8.   TRANSFERABILITY OF  COMMON STOCK.  The Warrantholder and his permitted
transferees shall be subject to the following restrictions on transferability of
the Common Stock issued or issuable upon exercise thereof:
 
        (a) CERTAIN DEFINITIONS. As used in this Section 8, the following  
terms shall have the following respective meanings:
 
           (i)  the terms "REGISTER," "REGISTERED" and "REGISTRATION" refer 
to a registration effected by preparing and filing a registration statement 
in compliance with the Securities  Act, and the  declaration or ordering of 
the effectiveness of such registration statement.
 
           (ii) "RESTRICTED SECURITIES" shall mean the securities of the 
Company required to bear the legend set forth in paragraph (c) of this 
Section 8.
 
           (iii)  "SECURITIES ACT" shall mean the Securities Act of 1933, 
as amended, or any similar federal statute and the rules and regulations of 
the Commission thereunder, all as the same shall be in effect at the 
time.
 
        (b) RESTRICTIONS ON TRANSFERABILITY. The Restricted Securities shall 
not be sold, assigned, transferred or pledged except upon the 
conditions specified in this Section 8, which conditions are intended 
to ensure compliance with the provisions of the Securities Act. Except for 
transfers pursuant  to an effective registration  statement or 
transactions in compliance with Rule 144, the Warrantholder (or permitted 
transferee of this Warrant, as the case may be) will cause any proposed 
purchaser, assignee, transferee, or pledgee of any such securities held by 
the Warrantholder to agree to take and hold such securities subject to the 
provisions and upon the conditions specified in this warrant agreement.

                                       -4-

<PAGE>

 
        (c)  RESTRICTIVE LEGEND. Each certificate representing shares of 
Common Stock issued or issuable pursuant to this Warrant and any other 
securities issued in respect thereof upon any stock split, stock 
dividend, recapitalization, merger, consolidation or similar event, shall 
(unless otherwise permitted by the provisions of paragraph (d) of this 
Section 8) be stamped or otherwise imprinted with a legend in substantially 
the following form (in addition to any legend required under applicable 
state securities laws):
 
       THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
       UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND HAVE BEEN
       ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH,
       THE SALE OR DISTRIBUTION THEREOF. SUCH SECURITIES MAY NOT BE SOLD OR
       TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION UNLESS THE COMPANY
       RECEIVES AN OPINION OF COUNSEL REASONABLY ACCEPTABLE TO IT STATING THAT
       SUCH SALE OR TRANSFER IS EXEMPT FROM THE REGISTRATION AND PROSPECTUS
       DELIVERY REQUIREMENTS OF SAID ACT. COPIES OF THE AGREEMENT COVERING THE
       PURCHASE OF THESE SECURITIES AND RESTRICTING THEIR TRANSFER MAY BE
       OBTAINED AT NO COST BY WRITTEN REQUEST MADE BY THE HOLDER OF RECORD OF
       THIS CERTIFICATE TO THE SECRETARY OF THE CORPORATION AT THE PRINCIPAL
       EXECUTIVE OFFICES OF THE CORPORATION.
 
       Each Warrantholder and permitted transferee (by his acceptance of such 
securities) consents to the Company making a notation on his records and 
giving instructions to any transfer agent of the Common Stock in order to 
implement the restrictions on transfer established in this Agreement.
 
        (d)  NOTICE OF PROPOSED TRANSFERS.  Prior to any proposed 
sale, assignment, transfer or pledge of any Restricted Securities, unless 
there is in effect a registration statement under the Securities Act 
covering the proposed transfer, the holder thereof shall give written 
notice to the Company of such holder's intention to effect such transfer, 
sale, assignment or pledge. Each such notice shall describe the manner and 
circumstances of the proposed transfer, sale, assignment or pledge in 
sufficient detail, and shall be accompanied, at such holder's expense 
(i) by either (A) an unqualified written opinion of legal counsel who 
shall be, and whose legal opinion shall be, reasonably satisfactory to the 
Company addressed to the Company, to the effect that the proposed 
transfer of the Restricted Securities may be effected without registration 
under the Securities Act, or (B) a "no action" letter from the Commission to 
the effect that the transfer of such securities without registration will 
not result in a recommendation by the staff of the Commission that action 
be taken with respect thereto, and (ii) except in transactions in 
compliance with Rule 144, a letter from the proposed transferee agreeing 
to be subject to the representations, conditions and restrictions set 
forth in this warrant agreement, whereupon the holder of such Restricted 
Securities shall be entitled to transfer such Restricted Securities in 
accordance with the terms of the notice delivered by the holder to the 
Company. Each certificate evidencing the Restricted Securities transferred 
as above provided shall bear, except if such transfer is made in compliance 
with Rule 144, the appropriate restrictive legend set forth in paragraph (c) 
of this Section 8, except that such certificate shall not bear such 
restrictive legend if in the opinion of counsel for such holder and the 

                                       -5-

<PAGE>

Company such legend is not required in order to establish compliance with 
any provision of the Securities Act.
 
        (e) REGISTRATION.  Each Warrantholder acknowledges and agrees that 
it shall have no right to cause the Company to register this Warrant or 
the Restricted Securities or to register, qualify or obtain permits for 
the distribution of the Warrant or the Restricted Securities pursuant to 
any applicable blue sky laws in connection with any distribution 
thereof. Notwithstanding the foregoing, the Company may, in its sole 
discretion, agree to register the Warrants or the Restricted Securities and 
to make or obtain applicable registrations, qualifications and permits under 
applicable blue sky laws in connection with the distribution thereof.

                                       -6-

<PAGE>

    DATE OF GRANT:
                   ---------------------
 
                                          LATTICE SEMICONDUCTOR CORPORATION
 
                                          By:
                                              ---------------------------------
                                          Title:
                                                 ---------------------------
 
    Warrantholder acknowledges receipt of a copy of the Plan, a copy of which is
attached hereto, and represents that he is familiar with the terms and
provisions thereof, and hereby accepts this Warrant subject to all of the terms
and provisions thereof. Warrantholder hereby agrees to accept as binding,
conclusive and final all decisions or interpretations of the Board of Directors
or the Committee upon any questions arising under the Plan.
 
<TABLE>
<S>                                            <C>
DATED:
      ---------------------------
                                               -------------------------------------------
                                               Print name of Warrantholder
 
Check One:
/ /  Authorized Sales                           -------------------------------------------
     Representative Firm                        Signature of Warrantholder
 
/ / Sales Representative

                                               -------------------------------------------
                                                Title of Signatory (if applicable)
</TABLE>
 
       *****************************************************************

                                       -7-

<PAGE>

 
                              FOR COMPANY USE ONLY

                              RECORD OF EXERCISES
 
<TABLE>
<CAPTION>
                        Number of Shares       Total Purchase      Request to Transfer
  Date of Exercise          Exercised              Price                Agent Sent         Initials
- --------------------  ---------------------  ------------------  ------------------------  ---------
<S>                   <C>                    <C>                 <C>                       <C>
</TABLE>


                                       -8-



<PAGE>
                                   EXHIBIT A

                                FORM OF EXERCISE

                  (To be signed only upon exercise of Warrant)
 
TO: LATTICE SEMICONDUCTOR CORPORATION
 
    The  undersigned holder of the attached Warrant hereby irrevocably elects to
exercise the right  to purchase  __________ shares  of Common  Stock of  LATTICE
SEMICONDUCTOR  CORPORATION and herewith  makes payment of  $__________ for those
shares, and requests that the certificate for those shares be issued in the name
of the  undersigned and  delivered to  the address  below the  signature of  the
undersigned.
 
Dated: _______________ 199_
 
                                          (Signature   must   conform   in   all
                                          respects  to   name   of   holder   as
                                          specified  on the face of the attached
                                          Warrant.)
 
                                          --------------------------------------
                                          Signature


                                          --------------------------------------
                                          Address


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


                                          --------------------------------------
                                          Taxpayer Identification Number
 

                                       -9-



<PAGE>

                                                                     EXHIBIT 5.1
 
                               November 12, 1997
 
Lattice Semiconductor Corporation
5555 N.E. Moore Court
Hillsboro, Oregon 97124-6421
 
    RE: POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-3 REGISTRATION STATEMENT
        -----------------------------------------------------------------
Ladies and Gentlemen:
 
    We have examined the Post-Effective Amendment No. 1 to Form S-3 Registration
Statement to be filed by you with the Securities and Exchange Commission on or
about November 12, 1997, in connection with the registration under the
Securities Act of 1933, as amended (the "Act"), as amended, of 150,000 shares
(the "Shares") of your Common Stock reserved for issuance under your Fiscal 1992
Sales Representative Warrant Plan (As Amended and Restated Effective May 13,
1996) (the "Warrant Plan").
 
    As your legal counsel, we have examined the proceedings taken and are
familiar with the proceedings proposed to be taken by you in connection with the
sale and issuance of the Shares. It is our opinion that, 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 nonassessable.
 
    We consent to the use of this opinion as an exhibit to said Post-Effective
Amendment No. 1 to Form S-3 Registration Statement and further consent to the
use of our name wherever appearing in said Post-Effective Amendment No. 1 to
Form S-3 Registration Statement and any amendments thereto.
 
                                     Very truly yours,
 
                                     WILSON SONSINI GOODRICH & ROSATI
                                     Professional Corporation

                                     /s/ WILSON SONSINI GOODRICH & ROSATI, P.C.

<PAGE>
                                                                    EXHIBIT 24.1
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
    We hereby consent to the incorporation by reference in the Prospectus
constituting part of this Post-Effective Amendment No. 1 to the Registration
Statement on Form S-3 of our report dated April 16, 1997, which appears on page
28 of the 1997 Annual Report to Shareholders of Lattice Semiconductor
Corporation, which is incorporated by reference in the Lattice Semiconductor
Corporation Annual Report on Form 10-K for the year ended March 29, 1997. We
also consent to the incorporation by reference of our report on the Financial
Statement Schedule which appears on page S-1 of such Annual Report on Form 10-K.
We also consent to the reference to us under the heading "Experts" in such
Prospectus.
 
/s/ PRICE WATERHOUSE LLP
 
PRICE WATERHOUSE LLP
 
Portland, Oregon
November 12, 1997


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