LATTICE SEMICONDUCTOR CORP
S-3/A, 1995-11-07
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>
   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 6, 1995
    
   
                                                       REGISTRATION NO. 33-63453
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ---------------------
   
                                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)

               DELAWARE                                93-0835214
    (State or other jurisdiction of                 (I.R.S. Employer
    incorporation or organization)               Identification Number)

                              5555 NE 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)
                             ---------------------

                                 CYRUS Y. TSUI
          CHAIRMAN OF THE BOARD, CHIEF EXECUTIVE OFFICER AND PRESIDENT
                              5555 NE MOORE COURT
                          HILLSBORO, OREGON 97124-6421
                                 (503) 681-0118
      (Name, address, including zip code, and telephone number, including
                        area code, of agent for service)
                             ---------------------

                                   COPIES TO:

         LARRY W. SONSINI, ESQ.                 WILLIAM D. SHERMAN, ESQ.
           JOHN A. FORE, ESQ.                    C. JEFFREY CHAR, ESQ.
  WILSON SONSINI GOODRICH & ROSATI, PC            MORRISON & FOERSTER
           650 PAGE MILL ROAD                      755 PAGE MILL ROAD
      PALO ALTO, CALIFORNIA 94304             PALO ALTO, CALIFORNIA 94304
             (415) 493-9300                          (415) 813-5600

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

    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, please 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, as amended (the "Securities Act"),  other than securities offered only  in
connection  with dividend  or interest  reinvestment plans,  check the following
box. / /

    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. / /
                             ---------------------

   
    THE REGISTRANT HEREBY  AMENDS THIS  REGISTRATION STATEMENT ON  SUCH DATE  OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE  A  FURTHER  AMENDMENT  WHICH SPECIFICALLY  STATES  THAT  THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE  IN ACCORDANCE WITH SECTION 8(A)  OF
THE  SECURITIES ACT  OF 1933 OR  UNTIL THIS REGISTRATION  STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION  8(A),
MAY DETERMINE.
    

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                EXPLANATORY NOTE

    This  Registration Statement contains  two forms of  prospectuses: one to be
used in connection with  an offering in  the United States and  the other to  be
used  in connection with a concurrent international offering (the "International
Prospectus"). The two prospectuses  are identical except  for the outside  front
cover  page. The  alternate page  for the  International Prospectus  is included
herein and labeled "Alternate Page For International Prospectus."
<PAGE>
Information  contained  herein  is  subject   to  completion  or  amendment.   A
registration  statement relating  to these  securities has  been filed  with the
Securities and Exchange  Commission. These securities  may not be  sold nor  may
offers  to buy be accepted prior to  the time the registration statement becomes
effective. This  prospectus  shall  not  constitute an  offer  to  sell  or  the
solicitation  of an offer to buy nor shall there be any sale of these securities
in any State in which such offer,  solicitation or sale would be unlawful  prior
to registration or qualification under the securities laws of any such State.
<PAGE>
   
PROSPECTUS (SUBJECT TO COMPLETION)
ISSUED NOVEMBER 6, 1995
    
                                2,500,000 SHARES
                                     [LOGO]

                                  COMMON STOCK
                               -----------------
 OF  THE 2,500,000 SHARES  OF COMMON STOCK BEING  OFFERED, 2,000,000 SHARES ARE
 BEING OFFERED  INITIALLY  IN THE  UNITED  STATES  AND CANADA  BY  THE  U.S.
    UNDERWRITERS  AND 500,000 SHARES ARE  BEING OFFERED INITIALLY OUTSIDE OF
    THE UNITED STATES AND CANADA BY THE INTERNATIONAL UNDERWRITERS. ALL OF
      THE SHARES OF  COMMON STOCK  OFFERED HEREBY  ARE BEING  SOLD BY  THE
      COMPANY.   THE   COMPANY'S   COMMON   STOCK   IS   TRADED   IN  THE
       OVER-THE-COUNTER MARKET UNDER THE NASDAQ NATIONAL MARKET  SYMBOL
         "LSCC."  THE LAST SALE  PRICE FOR THE  COMMON STOCK ON OCTOBER
         16, 1995, AS REPORTED ON THE    NASDAQ NATIONAL MARKET,  WAS
             $36 3/4 PER SHARE. SEE "PRICE RANGE OF COMMON STOCK."
                            ------------------------

        THIS OFFERING INVOLVES A HIGH DEGREE OF RISK. SEE "RISK FACTORS"
                          COMMENCING ON PAGE 6 HEREOF.
                              -------------------
 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.
                              -------------------

                                PRICE $  A SHARE
                              -------------------

<TABLE>
<CAPTION>
                                                                           UNDERWRITING
                                                        PRICE TO           DISCOUNTS AND         PROCEEDS TO
                                                         PUBLIC           COMMISSSIONS(1)        COMPANY(2)
                                                   -------------------  -------------------  -------------------
<S>                                                <C>                  <C>                  <C>
PER SHARE........................................           $                    $                    $
TOTAL(3).........................................           $                    $                    $
</TABLE>

- ---------
  (1) THE  COMPANY  HAS AGREED  TO  INDEMNIFY THE  UNDERWRITERS  AGAINST CERTAIN
      LIABILITIES, INCLUDING LIABILITIES  UNDER THE SECURITIES  ACT OF 1933,  AS
      AMENDED. SEE "UNDERWRITERS."

  (2) BEFORE DEDUCTING EXPENSES PAYABLE BY THE COMPANY ESTIMATED AT $         .

  (3) THE  COMPANY HAS GRANTED  TO THE U.S.  UNDERWRITERS AN OPTION, EXERCISABLE
      WITHIN 30 DAYS  OF THE  DATE HEREOF,  TO PURCHASE  UP TO  AN AGGREGATE  OF
      375,000  ADDITIONAL  SHARES  AT  THE  PRICE  TO  PUBLIC  LESS UNDERWRITING
      DISCOUNTS AND COMMISSIONS FOR THE PURPOSE OF COVERING OVER-ALLOTMENTS,  IF
      ANY.  IF THE  U.S. UNDERWRITERS  EXERCISE SUCH  OPTION IN  FULL, THE TOTAL
      PRICE TO PUBLIC,  UNDERWRITING DISCOUNTS AND  COMMISSIONS AND PROCEEDS  TO
      COMPANY  WILL BE $          , $         AND  $         , RESPECTIVELY. SEE
      "UNDERWRITERS."
                            ------------------------

    THE SHARES ARE OFFERED SUBJECT  TO PRIOR SALE, WHEN,  AS AND IF ACCEPTED  BY
THE  UNDERWRITERS NAMED HEREIN AND SUBJECT  TO APPROVAL OF CERTAIN LEGAL MATTERS
BY MORRISON  & FOERSTER,  COUNSEL  FOR THE  UNDERWRITERS.  IT IS  EXPECTED  THAT
DELIVERY  OF THE SHARES WILL BE MADE ON OR ABOUT NOVEMBER   , 1995 AT THE OFFICE
OF MORGAN STANLEY & CO. INCORPORATED,  NEW YORK, N.Y., AGAINST PAYMENT  THEREFOR
IN NEW YORK FUNDS.
                              -------------------

MORGAN STANLEY & CO.
             INCORPORATED

                  DONALDSON, LUFKIN & JENRETTE
                     SECURITIES CORPORATION

                        PAINEWEBBER INCORPORATED

                                                         NEEDHAM & COMPANY, INC.

         , 1995
<PAGE>
Information   contained  herein  is  subject   to  completion  or  amendment.  A
registration statement  relating to  these securities  has been  filed with  the
Securities  and Exchange  Commission. These securities  may not be  sold nor may
offers to buy be accepted prior  to the time the registration statement  becomes
effective.  This  prospectus  shall  not  constitute an  offer  to  sell  or the
solicitation of an offer to buy nor shall there be any sale of these  securities
in  any State in which such offer,  solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.
<PAGE>
                   [ALTERNATE PAGE FOR INTERNATIONAL PROSPECTUS]
   
PROSPECTUS (SUBJECT TO COMPLETION)
ISSUED NOVEMBER 6, 1995
    
                                2,500,000 SHARES
                                     [LOGO]

                                  COMMON STOCK
                               -----------------

   
 OF THE 2,500,000  SHARES OF  COMMON STOCK  BEING OFFERED,  500,000 SHARES  ARE
 BEING  OFFERED INITIALLY  OUTSIDE OF THE  UNITED STATES AND  CANADA BY THE
     INTERNATIONAL UNDERWRITERS  AND  2,000,000 SHARES  ARE  BEING  OFFERED
     INITIALLY IN THE UNITED STATES AND CANADA BY THE U.S. UNDERWRITERS.
        ALL  OF THE SHARES OF COMMON STOCK OFFERED HEREBY ARE BEING SOLD
        BY THE COMPANY. THE  COMPANY'S COMMON STOCK  IS TRADED IN  THE
          OVER-THE-COUNTER MARKET UNDER THE NASDAQ NATIONAL MARKET
              SYMBOL  "LSCC." THE  LAST SALE PRICE  FOR THE COMMON
              STOCK ON  OCTOBER 16,  1995, AS  REPORTED ON  THE
                 NASDAQ  NATIONAL MARKET,  WAS $36  3/4 PER
                              SHARE. SEE  "PRICE  RANGE  OF
                                 COMMON STOCK."
    
                            ------------------------

 THIS OFFERING INVOLVES A HIGH DEGREE OF RISK. SEE "RISK FACTORS" COMMENCING ON
                                 PAGE 6 HEREOF.
                              -------------------
 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.
                              -------------------

                                PRICE $  A SHARE
                              -------------------

<TABLE>
<CAPTION>
                                                                           UNDERWRITING
                                                                           DISCOUNTS AND         PROCEEDS TO
                                                     PRICE TO PUBLIC     COMMISSSIONS (1)        COMPANY (2)
                                                   -------------------  -------------------  -------------------
<S>                                                <C>                  <C>                  <C>
PER SHARE........................................           $                    $                    $
TOTAL (3)........................................           $                    $                    $
</TABLE>

- ---------

  (1) THE  COMPANY  HAS AGREED  TO  INDEMNIFY THE  UNDERWRITERS  AGAINST CERTAIN
      LIABILITIES, INCLUDING LIABILITIES  UNDER THE SECURITIES  ACT OF 1933,  AS
      AMENDED. SEE "UNDERWRITERS."

  (2) BEFORE DEDUCTING EXPENSES PAYABLE BY THE COMPANY ESTIMATED AT $       .

  (3) THE  COMPANY HAS GRANTED  TO THE U.S.  UNDERWRITERS AN OPTION, EXERCISABLE
      WITHIN 30 DAYS  OF THE  DATE HEREOF,  TO PURCHASE  UP TO  AN AGGREGATE  OF
      375,000  ADDITIONAL  SHARES  AT  THE  PRICE  TO  PUBLIC  LESS UNDERWRITING
      DISCOUNTS AND COMMISSIONS FOR THE PURPOSE OF COVERING OVER-ALLOTMENTS,  IF
      ANY.  IF THE  U.S. UNDERWRITERS  EXERCISE SUCH  OPTION IN  FULL, THE TOTAL
      PRICE TO PUBLIC,  UNDERWRITING DISCOUNTS AND  COMMISSIONS AND PROCEEDS  TO
      COMPANY  WILL BE $          , $         AND  $         , RESPECTIVELY. SEE
      "UNDERWRITERS."
                            ------------------------

   
    THE SHARES ARE OFFERED SUBJECT  TO PRIOR SALE, WHEN,  AS AND IF ACCEPTED  BY
THE  UNDERWRITERS NAMED HEREIN AND SUBJECT  TO APPROVAL OF CERTAIN LEGAL MATTERS
BY MORRISON  & FOERSTER,  COUNSEL  FOR THE  UNDERWRITERS.  IT IS  EXPECTED  THAT
DELIVERY  OF THE SHARES WILL BE MADE ON OR ABOUT NOVEMBER   , 1995 AT THE OFFICE
OF MORGAN STANLEY & CO. INCORPORATED,  NEW YORK, N.Y., AGAINST PAYMENT  THEREFOR
IN NEW YORK FUNDS.
    
                              -------------------

MORGAN STANLEY & CO.
             INTERNATIONAL

                  DONALDSON, LUFKIN & JENRETTE
                     SECURITIES CORPORATION

                        PAINEWEBBER INTERNATIONAL

                                                         NEEDHAM & COMPANY, INC.

         , 1995
<PAGE>
    NO  PERSON IS AUTHORIZED IN CONNECTION WITH ANY OFFERING MADE HEREBY TO GIVE
ANY INFORMATION OR TO MAKE ANY  REPRESENTATION NOT CONTAINED OR INCORPORATED  BY
REFERENCE  IN  THIS  PROSPECTUS,  AND  ANY  INFORMATION  OR  REPRESENTATION  NOT
CONTAINED OR  INCORPORATED  HEREIN  MUST  NOT BE  RELIED  UPON  AS  HAVING  BEEN
AUTHORIZED  BY  THE  COMPANY  OR  ANY  UNDERWRITER.  THIS  PROSPECTUS  DOES  NOT
CONSTITUTE AN OFFER TO SELL OR A SOLICITATION  OF AN OFFER TO BUY BY ANY  PERSON
IN  ANY JURISDICTION  IN WHICH IT  IS UNLAWFUL FOR  SUCH PERSON TO  MAKE SUCH AN
OFFERING OR SOLICITATION. NEITHER  THE DELIVERY OF THIS  PROSPECTUS AT ANY  TIME
NOR  ANY  SALE  MADE  HEREUNDER  SHALL UNDER  ANY  CIRCUMSTANCE  IMPLY  THAT THE
INFORMATION HEREIN IS CORRECT AS OF ANY DATE SUBSEQUENT TO THE DATE HEREOF.
                             ---------------------

    NO ACTION HAS BEEN OR WILL BE TAKEN IN ANY JURISDICTION BY THE COMPANY OR BY
AN UNDERWRITER  THAT WOULD  PERMIT A  PUBLIC  OFFERING OF  THE COMMON  STOCK  OR
POSSESSION  OR DISTRIBUTION OF THIS PROSPECTUS  IN ANY JURISDICTION WHERE ACTION
FOR THAT PURPOSE  IS REQUIRED,  OTHER THAN IN  THE UNITED  STATES. PERSONS  INTO
WHOSE  POSSESSION  THIS PROSPECTUS  COMES ARE  REQUIRED BY  THE COMPANY  AND THE
UNDERWRITERS TO INFORM THEMSELVES ABOUT, AND TO OBSERVE ANY RESTRICTIONS AS  TO,
THE OFFERING OF THE COMMON STOCK AND THE DISTRIBUTION OF THIS PROSPECTUS.
                             ---------------------

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                -----
<S>                                                                                                          <C>
Incorporation of Certain Documents by Reference............................................................           2
Prospectus Summary.........................................................................................           3
The Company................................................................................................           4
Risk Factors...............................................................................................           6
Use of Proceeds............................................................................................          11
Price Range of Common Stock................................................................................          11
Dividend Policy............................................................................................          11
Capitalization.............................................................................................          12
Selected Consolidated Financial Data.......................................................................          13
Business...................................................................................................          15
Description of Capital Stock...............................................................................          23
Certain United States Federal Tax Considerations for Non-U.S. Holders of Common Stock......................          25
Underwriters...............................................................................................          27
Legal Matters..............................................................................................          30
Experts....................................................................................................          30
Available Information......................................................................................          30
</TABLE>

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

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

   
    The  following documents heretofore filed by the Company with the Securities
and Exchange Commission (the "Commission")  pursuant to the Securities  Exchange
Act  of  1934,  as  amended  (the "Exchange  Act")  are  incorporated  herein by
reference: (1) the  Company's Annual  Report on Form  10-K for  the fiscal  year
ended  April 1, 1995;  (2) the Company's  Quarterly Report on  Form 10-Q for the
quarter ended July 1, 1995; (3) the Company's Quarterly Report on Form 10-Q  for
the quarter ended September 30, 1995, as amended by the Company's Report on Form
10-Q/A  filed on November 6, 1995; (4)  the Company's Current Report on Form 8-K
dated October 2, 1995; (5) the description of the Common Stock contained in  the
Company's  Registration  Statement  on Form  8-A  filed with  the  Commission on
September 27, 1989;  and (6)  the description  of the  preferred stock  purchase
rights  of the Company contained in the Company's Registration Statement on Form
8-A filed with the Commission on September 13, 1991.
    

    All documents filed by the Company pursuant to Sections 13(a), 13(c), 14  or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior to
the termination of the offering of the Common Stock hereunder shall be deemed to
be incorporated by reference herein and to be a part hereof from the date of the
filing  of such reports and documents.  The Company will provide without charge,
to each person to  whom this Prospectus is  delivered, a copy of  any or all  of
such  documents  (exclusive of  exhibits unless  such exhibits  are specifically
incorporated by reference  herein), upon written  or oral request  to Rodney  F.
Sloss, Vice President, Finance, Lattice Semiconductor Corporation, 5555 NE Moore
Court, Hillsboro, Oregon 97124, telephone (503) 681-0118.

    Any  statement  contained  in  a  document  incorporated  or  deemed  to  be
incorporated by reference herein  shall be deemed to  be modified or  superseded
for  purposes of this Prospectus to the extent that a statement contained herein
or in any  other subsequently filed  document that also  is or is  deemed to  be
incorporated  by  reference herein  modifies or  supersedes such  statement. Any
statement so modified or superseded shall  not be deemed, except as so  modified
or superseded, to constitute a part of this Prospectus.
                             ---------------------

    IN  CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR  MAINTAIN THE MARKET PRICE  OF THE COMMON  STOCK
OFFERED  HEREBY AT A LEVEL ABOVE THAT  WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH TRANSACTIONS MAY BE EFFECTED ON THE NASDAQ NATIONAL MARKET, IN  THE
OVER-THE-COUNTER  MARKET OR  OTHERWISE. SUCH  STABILIZING, IF  COMMENCED, MAY BE
DISCONTINUED AT ANY TIME.

    IN CONNECTION WITH  THIS OFFERING,  CERTAIN UNDERWRITERS  AND SELLING  GROUP
MEMBERS  (IF ANY)  OR THEIR RESPECTIVE  AFFILIATES MAY ENGAGE  IN PASSIVE MARKET
MAKING TRANSACTIONS  IN  THE COMMON  STOCK  ON  THE NASDAQ  NATIONAL  MARKET  IN
ACCORDANCE  WITH  RULE 10B-6A  UNDER THE  SECURITIES EXCHANGE  ACT OF  1934. SEE
"UNDERWRITERS."

                                       2
<PAGE>
                               PROSPECTUS SUMMARY

    THE  FOLLOWING SUMMARY  IS QUALIFIED  IN ITS  ENTIRETY BY  THE MORE DETAILED
INFORMATION AND  FINANCIAL STATEMENTS  APPEARING  ELSEWHERE OR  INCORPORATED  BY
REFERENCE IN THIS PROSPECTUS.

                                  THE COMPANY

    Lattice  Semiconductor Corporation  (the "Company")  is the  world's leading
supplier of in-system programmable ("ISP-TM-")  logic devices and pioneered  the
application  of  electrically erasable  CMOS  ("E(2)CMOS-Registered Trademark-")
technology to programmable logic. The Company designs, develops and markets both
high-and low-density,  high  performance  E(2)CMOS  programmable  logic  devices
("PLDs")   and   related  development   system   software.  PLDs   are  standard
semiconductor components that can be configured by the end customer as  specific
logic  circuits. PLDs enable the end customer  to shorten design cycle times and
reduce development costs.

    The  Company's  strategy   has  been  to   penetrate  the  rapidly   growing
high-density   complex   programmable   logic   device   ("CPLD")   market  with
differentiated products and technology while maintaining its leadership position
in the low-density market. The Company  has pioneered the development of ISP,  a
proprietary  technology,  which  affords  it  a  competitive  advantage  in  the
high-density CPLD market. ISP can allow customers to reduce design cycle  times,
accelerate time to market, reduce prototyping costs, reduce manufacturing costs,
lower  inventory requirements  and perform  simplified and  cost-effective field
upgrades. The Company  seeks to  maintain a relatively  high margin  low-density
product  mix by  differentiating its  products through  performance, proprietary
architectures and  lower operating  voltages. The  Company's end  customers  are
primarily   original  equipment   manufacturers  ("OEMs")   in  the   fields  of
communications, computing, peripherals, instrumentation, industrial controls and
military systems.

                                  THE OFFERING

<TABLE>
<S>                                      <C>
U.S. Offering..........................  2,000,000 Shares
International Offering.................  500,000 Shares
Total (1)..............................  2,500,000 Shares
Common Stock to be outstanding
 after the offering....................  22,002,914 Shares (1)(2)
Use of proceeds........................  For expansion and maintenance of the Company's
                                         wafer supply and assembly capacity, including
                                           funding a planned equity investment in an
                                           advanced semiconductor manufacturing facility in
                                           Taiwan, and other general corporate purposes,
                                           including procurement of additional capital
                                           equipment and facilities, development of new
                                           products and possible acquisitions. See "Use of
                                           Proceeds" and "Business -- Operations -- Wafer
                                           Fabrication."
The Nasdaq National Market symbol......  LSCC
</TABLE>

                    SUMMARY CONSOLIDATED FINANCIAL DATA (3)
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                                                                   SIX MONTHS
                                                                      FISCAL YEAR ENDED                              ENDED
                                                  ---------------------------------------------------------  ----------------------
                                                   MARCH 30,    MARCH 28,   APRIL 3,   APRIL 2,   APRIL 1,    OCT. 1,    SEPT. 30,
                                                     1991         1992        1993       1994       1995       1994        1995
                                                  -----------  -----------  ---------  ---------  ---------  ---------  -----------
<S>                                               <C>          <C>          <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenue.........................................   $  64,539    $  71,009   $ 103,391  $ 126,241  $ 144,083  $  67,477   $  93,621
Income from operations..........................      12,115       13,315      22,746     30,040     37,268     17,339      26,502
Net income......................................      10,297       10,855      17,399     22,490     26,966     12,418      18,624
Net income per share............................   $    0.61    $    0.61   $    0.94  $    1.19  $    1.41  $    0.65   $    0.93
Weighted average common and common equivalent
  shares outstanding............................      16,770       17,834      18,458     18,946     19,164     19,073      20,117
</TABLE>

<TABLE>
<CAPTION>
                                                         AS OF SEPTEMBER 30, 1995
                                                         ------------------------
                                                          ACTUAL   AS ADJUSTED(4)
                                                         --------  --------------
<S>                                                      <C>       <C>
CONSOLIDATED BALANCE SHEET DATA:
Working capital........................................  $138,050     $225,119
Total assets...........................................   225,768     312,837
Stockholders' equity...................................   186,006     273,075
<FN>
- ------------
(1)  Assumes the U.S.  Underwriters' over-allotment option  to purchase  375,000
     shares is not exercised. See "Underwriters."
(2)  Excludes  (i)  2,063,126  shares  of Common  Stock  subject  to outstanding
     options under  the Company's  1988  Stock Incentive  Plan with  an  average
     exercise  price of $19.75 per share and 693,560 shares available for future
     grants of options thereunder as of September 30, 1995; (ii) 133,593  shares
     of  Common Stock reserved  but unissued under  the Company's Employee Stock
     Purchase Plan; (iii) 94,125 shares  of Common Stock subject to  outstanding
     options  under the Company's 1993 Outside  Directors Stock Option Plan with
     an average exercise price of $20.49 per share and 148,500 shares  available
     for  future grants of options thereunder as of September 30, 1995; and (iv)
     123,625 shares of  Common Stock  subject to outstanding  warrants owned  by
     Bain & Company with an average exercise price of $18.76 per share.
(3)  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.
(4)  Gives effect to the issuance and sale of 2,500,000 shares offered hereby by
     the  Company at  an assumed  per share offering  price of  $36.75, the last
     reported sale price of the Common Stock on October 16, 1995.
</TABLE>

                                       3
<PAGE>
                                  THE COMPANY

    Lattice  Semiconductor Corporation  (the "Company")  is the  world's leading
supplier of in-system programmable ("ISP-TM-")  logic devices and pioneered  the
application  of  electrically erasable  CMOS  ("E(2)CMOS-Registered Trademark-")
technology to programmable logic. The Company designs, develops and markets both
high-and low-density,  high  performance  E(2)CMOS  programmable  logic  devices
("PLDs")   and   related  development   system   software.  PLDs   are  standard
semiconductor components that can be configured by the end customer as  specific
logic  circuits, and enable the  end customer to shorten  design cycle times and
reduce development costs.

    Manufacturers of  electronic systems  are increasingly  challenged to  bring
differentiated  products to  market quickly.  These competitive  pressures often
preclude the  use of  custom-designed application  specific integrated  circuits
("ASICs"),  which  generally entail  significant  design risks  and  time delay.
Standard logic  products,  an  alternative to  custom-designed  ASICs,  limit  a
manufacturer's  flexibility  to adequately  customize  an end  system.  PLDs are
standard products that can  be configured into a  virtually unlimited number  of
specific  logic circuits by programming the device with electrical signals. PLDs
give system  designers the  ability to  quickly create  their own  custom  logic
circuits and to provide product differentiation and rapid time to market.

    The  Company offers  a full  product line  in both  the high-density complex
programmable logic device ("CPLD") market  and the low-density CMOS PLD  market.
The  Company's strategy has  been to penetrate  the rapidly growing high-density
CPLD market with  differentiated products and  technology while maintaining  its
leadership  position in the low-density market. Since the Company introduced its
first high-density  products in  fiscal 1993,  its percentage  of total  revenue
generated by sales of high-density products has grown to 21% for the fiscal year
ended April 1, 1995 and 33% for the six-month period ended September 30, 1995.

    The  Company has pioneered the development of ISP, a proprietary technology,
which affords it  a competitive advantage  in the high-density  CPLD market.  In
contrast  to  standard  PLD  programming  technologies,  ISP  allows  the system
designer to configure and reconfigure the  PLD without removing the device  from
the  system  board. ISP  enhances the  flexibility of  PLD devices,  providing a
number of important benefits to a  system manufacturer across the full  spectrum
of  an electronic system product cycle. ISP can allow customers to reduce design
cycle times,  accelerate  time  to  market,  reduce  prototyping  costs,  reduce
manufacturing  costs, lower  inventory requirements  and perform  simplified and
cost-effective field upgrades.

    Since the Company entered  the high-density CPLD market  in fiscal 1993,  it
has    introduced    three    high-density    CPLD    product    families,   the
ispLSI-Registered Trademark- 1000, ispLSI 2000 and ispLSI 3000. The ispLSI 1000,
the Company's first high-density CPLD  product family, was the industry's  first
PLD  product family based on ISP  technology. The ispLSI 1000 offers performance
of up to 110 MHz, with propagation delays (the time it takes an input signal  to
propagate  through the device to  a designated output) as  low as 10 nanoseconds
and densities of  2,000 to 8,000  gates. The ispLSI  2000 product family,  first
introduced  in fiscal 1994, offers  CPLD performance leadership with performance
of up to  154 MHz, with  propagation delays as  low as 5.5  nanoseconds, and  is
capable of supporting high speed communications and computing applications based
on  advanced  microprocessors, such  as  Pentium, PowerPC  and  other RISC-based
systems. The  ispLSI  3000  product  family, also  introduced  in  fiscal  1994,
incorporates an enhanced logic architecture to target CPLD density leadership at
densities  of  8,000 to  14,000 gates  and performance  of up  to 100  MHz, with
propagation delays  as low  as 10  nanoseconds. The  ispLSI 3000  family  offers
additional   architectural  enhancements  and  boundary  scan  test  to  satisfy
sophisticated and complex customer applications.

    The Company's high-density CPLD products with ISP technology can be  quickly
and  easily configured and reconfigured on  the system board using the Company's
proprietary software development tools. These tools may be used on a stand-alone
basis or integrated  with computer  aided engineering ("CAE")  design tools  and
automatic  test equipment provided  by selected third  party vendors. During the
twelve months ended  September 30, 1995,  the number of  installed seats of  the
Company's software development tools, as measured by the Company, has grown from
over 3,000 to over 7,000.

   
    The  high-density  CPLD  market,  according  to  Dataquest  Incorporated,  a
semiconductor market research firm,  amounted to $306  million in calendar  year
1994  and  is growing  at a  37%  annual rate.  The Company's  high-density CPLD
revenue mix by  end-market for  the first  six months  of fiscal  1996 was:  49%
    

                                       4
<PAGE>
communications,  11%  computing, 23%  peripherals and  17% industrial  and other
markets. The Company expects that in  the future the communications market  will
continue  to account  for a  substantial portion  of the  Company's high-density
revenue and revenue growth.

    The Company holds a leading position in the low-density CMOS PLD market. The
Company seeks to maintain a relatively  high margin, low-density product mix  by
differentiating  its products through performance, proprietary architectures and
by offering  lower  operating  voltages.  In  addition,  the  Company  maintains
industry  leading  performance across  its entire  low-density CMOS  PLD product
line.

    The Company offers  the industry's  broadest line of  low-density CMOS  PLDs
based  on its 16  families of GAL-Registered  Trademark- ("Generic Array Logic")
products offered  in  over  150  speed, power,  package  and  temperature  range
combinations.  GAL devices range  in complexity from  approximately 200 to 1,000
logic gates and  are typically assembled  in 20-, 24-  and 28-pin standard  dual
in-line  packages ("DIPs")  and in 20-  and 28-pin standard  plastic leaded chip
carrier ("PLCC") packages. The  Company's low-density PLDs  are offered in  both
5-volt  and  3.3-volt  technologies  with  propagation  delays  as  low  as  3.5
nanoseconds, the highest performance in  the industry. The Company is  currently
selling  the GAL16LV8D-3.5, the world's fastest  PLD available in any technology
or operating voltage.

    The Company sells its products directly  to end customers through a  network
of  independent  sales  representatives  and  indirectly  through  a  network of
distributors.  The  Company  utilizes  a  direct  sales  management  and   field
applications   engineering  organization  in   combination  with  manufacturer's
representatives and  distributors  to  reach  a  broad  base  of  potential  end
customers.   The  Company's  end  customers  are  primarily  original  equipment
manufacturers ("OEMs") in the fields of communications, computing,  peripherals,
instrumentation,  industrial controls and military systems. The Company believes
its distribution  channels  provide  a cost-effective  means  for  reaching  end
customers.

    The  Company's current high- and low-density  PLD offerings are based on the
Company's proprietary E(2)CMOS process technologies, termed
UltraMOS-Registered Trademark-.  The  Company's  current  production  processes,
UltraMOS  IV and UltraMOS  V, are sub-micron CMOS  technologies. The Company has
recently released  to production  UltraMOS VI,  an advanced  sub-micron  process
technology designed to enhance product performance and densities.

    The  Company's manufacturing  strategy has  been to  procure wafers  for its
products from a leading manufacturer under current purchase orders and long-term
agreements, which has allowed the Company to avoid the cost of establishing  its
own  wafer fabrication facility. The Company  currently obtains all of its wafer
supply from  Seiko  Epson  Corporation ("Seiko  Epson")  through  Seiko  Epson's
affiliated  United  States  distributor,  S  MOS  Systems  Inc.  ("S  MOS"). See
"Business -- Licenses and Agreements -- Seiko Epson/ S MOS." The Company intends
to expand existing sources and establish additional sources of wafer supply  for
its  products at such time  as these arrangements are  required to meet customer
demand.  The  Company  entered   into  a  series   of  agreements  with   United
Microelectronics  Corporation ("UMC")  in September  1995 pursuant  to which the
Company has agreed to join  UMC and several other  companies to form a  separate
Taiwanese  company  for  the  purpose  of  building  and  operating  an advanced
semiconductor manufacturing facility  in Taiwan,  Republic of  China. Under  the
terms  of the agreement, the  Company will invest $60  million, payable in three
installments over the next two  and a half years, for  a 10% equity interest  in
the  venture  and the  right to  receive  a percentage  of the  facility's wafer
production at market prices. In a related agreement, UMC has committed to supply
the Company with sub-micron  wafers beginning in the  first calendar quarter  of
1996 and continuing with phased increases for several years, until such capacity
is  available from the new facility. See "Business -- Licenses and Agreements --
UMC."

    The Company  was  incorporated  in  Oregon in  1983  and  reincorporated  in
Delaware  in 1985. The Company's principal offices  are located at 5555 NE Moore
Court, Hillsboro,  Oregon 97124,  and its  telephone number  is (503)  681-0118.
References  to the Company shall mean  Lattice Semiconductor Corporation and its
subsidiaries, unless the context requires otherwise.

    "GAL", "ispLSI", "ispGAL",  "E(2)CMOS", "UltraMOS",  "pDS", "pDS+",  "pLSI",
"ISP",  "ISP", "In-System  Programmable", "In-System  Programmability", "LATTICE
SEMICONDUCTOR  CORPORATION",  "Silicon  Forest"  and  "L  LATTICE  SEMICONDUCTOR
CORPORATION",  including the design and the symbol  "L" in the form appearing on
the cover  page  of  this  Prospectus,  are  trademarks  of  the  Company.  This
Prospectus  also includes  product names,  trade names  and trademarks  of other
companies.

                                       5
<PAGE>
                                  RISK FACTORS

    IN ADDITION TO THE OTHER INFORMATION PROVIDED IN THIS PROSPECTUS AND IN  THE
DOCUMENTS INCORPORATED BY REFERENCE HEREIN, THE FOLLOWING RISK FACTORS SHOULD BE
CAREFULLY   CONSIDERED  IN  EVALUATING  THE  COMPANY  AND  ITS  BUSINESS  BEFORE
PURCHASING THE COMMON STOCK OFFERED BY THIS PROSPECTUS.

    DEPENDENCE ON WAFER SUPPLIERS.   The Company  does not manufacture  finished
silicon   wafers.  Its  products,  however,  require  wafers  manufactured  with
state-of-the-art  fabrication   equipment  and   techniques.  Accordingly,   the
Company's  strategy has been to  maintain relationships with large semiconductor
manufacturers for the production  of its wafers. All  of its silicon wafers  are
currently  manufactured by Seiko Epson in Japan and sold to the Company, through
Seiko Epson's affiliated U.S. distributor, S MOS. See "Business -- Licenses  and
Agreements  -- Seiko  Epson/S MOS."  In connection  with a  series of agreements
recently entered  into  with UMC  providing  for  the formation  of  a  separate
Taiwanese  company  for  the  purpose  of  building  and  operating  an advanced
semiconductor manufacturing facility in Taiwan, Republic of China, UMC committed
to supply the  Company with sub-micron  wafers beginning in  the first  calendar
quarter  of 1996  and continuing  with phased  increases for  several years. See
"Business --  Licenses and  Agreements --  UMC." A  significant interruption  in
supply  from Seiko Epson through S MOS or from UMC would have a material adverse
effect on the Company's business.

    Worldwide  manufacturing  capacity  for   silicon  wafers  is  limited   and
inelastic. Therefore, significant increases in demand or interruptions in supply
could  adversely affect the  Company. Through fiscal 1995,  the Company has been
successful  in  obtaining  adequate  wafer  capacity  commitments  and  has  not
experienced  any  material  difficulties  or delays  in  the  supply  of wafers.
Presently, demand on wafer suppliers for silicon wafers is growing and  existing
capacity  commitments may not be sufficient to permit the Company to satisfy all
of its customers' demand in future periods. The Company negotiates wafer  prices
and  certain wafer supply  commitments with Seiko  Epson and S  MOS on an annual
basis, and, in some cases, as frequently as semiannually. Moreover, wafer prices
and commitments are subject  to continuing review and  revision by the  parties.
Although current commitments are anticipated to be adequate through fiscal 1996,
Seiko  Epson and S MOS advised the Company in July 1995 that, due to high levels
of  demand   and  limited   manufacturing  capacity,   there  were   significant
uncertainties  as to whether they would be  able to supply wafers to the Company
for the Company's  fiscal 1997 at  increased levels relative  to fiscal 1996  or
even  at  historical  levels.  More  recently,  however,  the  Company  received
indications from Seiko Epson and  S MOS that they believe  they will be able  to
supply  wafers to the Company in fiscal 1997 at levels moderately higher than in
fiscal 1996. In addition, the Company recently obtained a commitment from UMC to
supply the  Company  with sub-micron  wafers  beginning in  the  first  calendar
quarter  of 1996 and  continuing with phased increases  for several years. Wafer
prices and  other  purchase  terms  are  expected  to  be  negotiated  prior  to
initiating  wafer production  and will  be subject  to periodic  adjustment. The
availability of  wafers  from  UMC  will depend  on,  among  other  things,  UMC
successfully  achieving volume  production. There can  be no  assurance that UMC
will successfully  achieve volume  production of  Company wafers  or that  Seiko
Epson,  S MOS  or UMC will  not reduce  their allocations of  wafers or increase
prices to the Company  in future periods  or that any  such reduction in  supply
could  be offset pursuant  to arrangements with alternate  sources of supply. If
any substantial reduction of supply or substantial price increase were to occur,
the Company's  operating results  would be  materially adversely  affected.  The
Company's  future revenue growth will depend in  part on improving yields of die
per wafer through reductions in the die size of its products, shifting  capacity
to  a higher  revenue per wafer  product mix,  successfully achieving production
volumes at UMC, increasing its wafer allocations from its suppliers or obtaining
additional wafer allocations  from other  suppliers. There can  be no  assurance
that  the Company will be successful in improving yields, enhancing product mix,
achieving volume production at UMC or otherwise increasing wafer supply.

    The Company's wafer purchases from  Seiko Epson are denominated in  Japanese
yen. During the first two calendar quarters of 1995, the dollar lost substantial
value  with respect  to the yen.  Such loss  was regained in  the third calendar
quarter of 1995. There is no assurance that the value of the dollar with respect
to the yen will not again experience substantial deterioration or that any  such
deterioration  will  not  continue  in  the  future.  Any  substantial continued
deterioration of dollar-yen exchange rates could have a material adverse  effect
on the Company's results of operations.

                                       6
<PAGE>
    The  Company depends upon wafer suppliers  to produce wafers with acceptable
yields and to deliver them to the Company in a timely manner. Substantially  all
of  the Company's revenues  are derived from products  based on E(2)CMOS process
technology. Successful  implementation  of the  Company's  proprietary  E(2)CMOS
process technology, UltraMOS, requires a high degree of coordination between the
Company  and its wafer supplier. Therefore, significant lead time is required to
reach volume production at a new wafer supply location such as UMC. Accordingly,
there can be no assurance that volume production at UMC will be achieved in  the
near  term or at all. The manufacture of high performance E(2)CMOS semiconductor
wafers is a  complex process  that requires a  high degree  of technical  skill,
state-of-the-art  equipment and effective cooperation between the wafer supplier
and the circuit designer to produce acceptable yields. Minute impurities, errors
in any step  of the  fabrication process,  defects in  the masks  used to  print
circuits  on a  wafer and  other factors can  cause a  substantial percentage of
wafers to be rejected or numerous die on each wafer to be non-functional. As  is
common  in  the  semiconductor  industry,  the Company  has  from  time  to time
experienced in  the past  and expects  that  it will  experience in  the  future
production yield problems and delivery delays. Any prolonged inability to obtain
adequate  yields or  deliveries could  adversely affect  the Company's operating
results.

    The Company expects that, as is customary in the semiconductor business,  it
will  in the future seek to convert its fabrication process technology to larger
wafer sizes, to smaller device geometries  or to new or additional suppliers  in
order  to maintain or enhance its  competitive position. Such conversions entail
inherent technological risks  that could  adversely affect  yields and  delivery
times  and  could have  a  material adverse  impact  on the  Company's operating
results. To  a  considerable  extent,  the  Company's  ability  to  execute  its
strategies  will depend  upon its ability  to maintain and  enhance its advanced
process technologies. As the  Company does not presently  operate its own  wafer
fabrication  or process development  facility, the Company  depends upon silicon
wafer manufacturers  to  provide the  facilities  and support  for  its  process
development. In light of this dependency and the intensely competitive nature of
the semiconductor industry, there is no assurance that either process technology
development or timely product introduction can be sustained in the future.

    In  addition, other unanticipated changes in or disruptions of the Company's
wafer supply arrangements  could reduce product  availability, increase cost  or
impair product quality and reliability. Many of the factors that could result in
such  changes are  beyond the  Company's control.  For example,  a disruption of
operations at Seiko Epson's or UMC's  manufacturing facilities as a result of  a
work stoppage, fire, earthquake or other natural disaster, would cause delays in
shipments  of the Company's products and could have a material adverse effect on
the Company's operating results.

    DEPENDENCE ON ASSEMBLY CONTRACTORS.   The Company's finished silicon  wafers
are  assembled  and  packaged  by  independent  subcontractors  located  in  the
Philippines and  South  Korea. Although  the  Company has  not  yet  experienced
significant  problems or interruptions in  supply from its assembly contractors,
any prolonged work  stoppages or other  failure of these  contractors to  supply
finished  products  would  have  a  material  adverse  effect  on  the Company's
operating results.

    FLUCTUATIONS IN OPERATING  RESULTS.   The Company believes  that its  future
operating  results will  be subject  to quarterly  variations based  upon a wide
variety of  factors, including  the cyclical  nature of  both the  semiconductor
industry  and the markets addressed by the Company's products, the timing of new
product introductions, price erosion, product obsolescence, substantial  adverse
currency  exchange  rate  movements,  variations  in  product  mix,  scheduling,
rescheduling  and  cancellation  of  large  orders,  competitive  factors,   the
availability  of manufacturing capacity and wafer supply, the ability to achieve
volume production  at UMC,  the ability  to develop  and implement  new  process
technologies,  fluctuations in  manufacturing yields,  changes in  effective tax
rates and litigation  expenses. Due to  these and other  factors, the  Company's
past  results are a less useful predictor of  future results than is the case in
more mature and less dynamic industries. The Company has increased its level  of
operating  expenses and investment in  manufacturing capacity in anticipation of
future growth in revenues,  primarily from increased  sales of its  high-density
products.  To  the extent  that this  revenue growth  does not  materialize, the
Company's operating results would be adversely affected.

                                       7
<PAGE>
    PRODUCT ENHANCEMENTS  AND  NEW PRODUCTS.    Because  of the  rapid  rate  of
technological  change in the semiconductor  industry, the Company's success will
ultimately depend in large part  on its ability to  introduce new products on  a
timely  basis that meet a market need at a competitive price and with acceptable
margins as  well as  enhancing the  performance of  its existing  products.  The
success  of new products, including the Company's high-density product families,
depends on  a  variety  of  factors, including  product  selection,  timely  and
efficient  completion of product design,  timely and efficient implementation of
manufacturing  and  assembly   processes,  product   performance,  quality   and
reliability  in the field and effective sales and marketing. Because new product
development commitments  must be  made well  in advance  of sales,  new  product
decisions  must anticipate  both future demand  and the technology  that will be
available to supply that demand. New and enhanced products are continually being
introduced into  the Company's  markets by  others, and  these products  can  be
expected  to affect the competitive environment in the markets in which they are
introduced. There  is  no assurance  that  the  Company will  be  successful  in
enhancing  its  existing products  or  in selecting,  developing, manufacturing,
marketing and selling new products.

    The majority of the Company's revenue  and gross margin percentage over  the
past  three fiscal years was due to revenues from low-density GAL products, many
of which are second  sourced by other suppliers.  Future revenue growth will  be
largely  dependent on  market acceptance  of the  Company's new  and proprietary
products, including its high-density product families, and market acceptance  of
the  Company's proprietary software development tools. There can be no assurance
that the Company's product and process development efforts will be successful or
that new products, including the Company's high-density products, will  continue
to achieve market acceptance. If the Company were unable to successfully define,
develop  and introduce competitive  new products in a  timely manner, its future
operating results would be adversely affected.

    COMPETITION AND RAPID TECHNOLOGICAL CHANGE.   The semiconductor industry  is
intensely competitive and is characterized by rapid technological change, sudden
price  fluctuations, general price erosion, rapid rates of product obsolescence,
periodic shortages of  materials and  manufacturing capacity  and variations  in
manufacturing  costs and yields. The  Company's competitive position is affected
by all of  these factors  and by industry  competition for  effective sales  and
distribution  channels. The  Company's existing and  potential competitors range
from established  major domestic  and international  semiconductor companies  to
emerging companies. Many of the Company's competitors have substantially greater
financial,  technological, manufacturing, marketing and sales resources than the
Company. The Company faces direct competition from companies that have developed
or licensed similar technology and from licensees of the Company's products  and
technology.  The Company also faces indirect  competition from a wide variety of
semiconductor companies  offering products  and solutions  based on  alternative
technologies.  Although  to date  the  Company has  not  experienced significant
competition from companies located outside the United States, such companies may
become a more significant competitive factor  in the future. As the Company  and
its  current competitors seek to expand their markets, competition may increase,
which  could  have  an  adverse  effect  on  the  Company's  operating  results.
Development  of  new  technologies that  have  price/performance characteristics
superior to  the Company's  technologies could  adversely affect  the  Company's
results  of operations. There can be no  assurance that the Company will be able
to develop and market new products successfully or that the products  introduced
by others will not render the Company's products or technologies non-competitive
or obsolete. See "-- Product Enhancements and New Products." The Company expects
that  its markets will become  more competitive in the  future. See "Business --
Competition."

    CYCLICAL NATURE OF THE SEMICONDUCTOR  INDUSTRY.  The semiconductor  industry
is  highly cyclical  and has  been subject  to significant  downturns at various
times that  have been  characterized by  diminished product  demand,  production
overcapacity  and accelerated erosion  of average selling  prices. The Company's
rate of growth in recent periods  has been positively impacted by recent  trends
in   the  semiconductor  industry.  Any   material  imbalance  in  industry-wide
production capacity  relative  to  demand, shift  in  industry  capacity  toward
products  competitive  with the  Company's products,  reduced demand  or reduced
growth in demand or  other factors could  result in a  rapid decline in  product
pricing and have a material adverse effect on the Company's operating results.

                                       8
<PAGE>
    FUTURE  CAPITAL NEEDS.  In an effort  to secure additional wafer supply, the
Company may from  time to  time consider various  arrangements, including  joint
ventures  with, minority investments in, advanced purchase payments to, loans to
or similar arrangements  with independent  wafer manufacturers  in exchange  for
committed  production capacity. Such arrangements are becoming common within the
industry as independent wafer manufacturers  increasingly seek to require  their
customers  to share a portion of the cost of capital intensive wafer fabrication
facilities. The Company entered into an advanced production payment  arrangement
with Seiko Epson in 1994 pursuant to which it advanced a total of $42 million to
Seiko  Epson. See "Business -- Licenses and Agreements -- Seiko Epson/S MOS." In
September 1995, the  Company entered into  an agreement with  UMC to invest  $60
million  for a 10% equity interest in a separate Taiwanese company providing for
the formation of a joint  venture with UMC and  several other companies for  the
purpose  of  building  and  operating  an  advanced  semiconductor manufacturing
facility. See "Business --  Licenses and Agreements --  UMC." To the extent  the
Company  pursues any other such transactions with  Seiko Epson, UMC or any other
wafer manufacturers,  such  transactions could  entail  even greater  levels  of
investment  requiring the Company to seek additional equity or debt financing to
fund such activities. See "Use of Proceeds." There can be no assurance that  any
such additional funding could be obtained when needed or, if available, on terms
acceptable to the Company.

    LIMITED  PROTECTION OF INTELLECTUAL PROPERTY.  The Company's success depends
in part on its proprietary technology. While the Company attempts to protect its
proprietary  technology  through  patents,  copyrights  and  trade  secrets,  it
believes  that  its  success  will  depend  more  upon  technological expertise,
continued development of new products, and successful market penetration of  its
silicon  and software products. There can be  no assurance that the Company will
be able  to protect  its technology  or that  competitors will  not be  able  to
develop  similar technology independently. The Company currently has a number of
United States  and foreign  patents and  patent applications.  See "Business  --
Patents."  There can be no assurance that the claims allowed on any patents held
by the Company will be sufficiently  broad to protect the Company's  technology,
or  that any  patents will issue  from any  application pending or  filed by the
Company. In addition, there can be no  assurance that any patents issued to  the
Company  will not be challenged, invalidated  or circumvented or that the rights
granted thereunder will provide competitive advantages to the Company.

    The semiconductor industry is generally characterized by vigorous protection
and pursuit  of  intellectual  property  rights and  positions,  which  have  on
occasion  resulted in  protracted litigation  that utilizes  cash and management
resources, which can have a significant adverse effect on operating results. The
Company has received a letter from a semiconductor manufacturer stating that  it
believes  a number of  its patents, related to  product packaging, cover certain
products sold by  the Company.  While the  manufacturer has  offered to  license
certain  of such patents to  the Company, there can be  no assurance, on this or
any other claim which may  be made against the  Company, that the Company  could
obtain  a license on  terms or under  conditions that would  be favorable to the
Company. In addition, there can be no assurance that other intellectual property
claims will not be made  against the Company in the  future or that the  Company
will  not be prohibited from using the technologies subject to such claims or be
required to obtain licenses and make corresponding royalty payments for past  or
future use. See "Business -- Patents."

    IMPORTANCE  OF INTERNATIONAL REVENUES.  International revenues accounted for
45%, 43%, 47% and  49% of the  Company's revenues for  fiscal years 1993,  1994,
1995 and the first six months of fiscal 1996, respectively. The Company believes
that  international revenues will continue to represent a significant percentage
of revenues. International revenues and operations may be adversely affected  by
the   imposition   of  governmental   controls,  export   license  requirements,
restrictions  on  the  export   of  technology,  political  instability,   trade
restrictions,  changes  in tariffs  and  difficulties in  staffing  and managing
international operations. See "Business -- Marketing, Sales and Customers."

    DEPENDENCE ON  KEY  PERSONNEL.    The  future  success  of  the  Company  is
dependent,  in  part, on  its  ability to  attract  and retain  highly qualified
technical  and  management  personnel,  particularly  highly  skilled  engineers
involved  in  new product,  both silicon  and  software, and  process technology
development. Competition  for  such  personnel  is  intense.  There  can  be  no
assurance   that  the  Company   will  be  able  to   retain  its  existing  key

                                       9
<PAGE>
technical and management personnel or attract additional qualified employees  in
the  future.  The loss  of  key technical  or  management personnel  could delay
product development cycles or  otherwise have a material  adverse effect on  the
Company's business.

    FOREIGN  MANUFACTURING AND ASSEMBLY.  The Company currently depends on Seiko
Epson, a Japanese company,  for the manufacture of  all of its finished  silicon
wafers,  and  anticipates depending  on UMC,  a Taiwanese  company, and  a joint
venture formed with UMC and other semiconductor companies for the manufacture of
a portion of its finished silicon wafers. In addition, after wafer manufacturing
is completed and each wafer is tested, products are assembled by  subcontractors
in  South Korea and the Philippines.  Although the Company's subcontractors have
not recently experienced any  serious work stoppages,  the social and  political
situations  in these countries can be volatile, and any prolonged work stoppages
or other disruptions in  the Company's ability to  manufacture and assemble  its
products  would  have a  material  adverse effect  on  the Company's  results of
operations. Furthermore, economic  risks, such as  changes in currency  exchange
rates,   tax  laws,  tariffs,   or  freight  rates,   or  interruptions  in  air
transportation, could have a material adverse effect on the Company's results of
operations. See "Business -- Operations."

    VOLATILITY OF COMMON STOCK PRICE.  The market price of the Company's  Common
Stock  could be subject to significant fluctuations in response to variations in
quarterly operating  results, shortfalls  in revenues  or earnings  from  levels
expected  by  securities analysts  and other  factors  such as  announcements of
technological innovations or  new products by  the Company or  by the  Company's
competitors, government regulations, developments in patent or other proprietary
rights,  and  developments  in  the  Company's  relationships  with  parties  to
collaborative agreements. In addition, the stock market has recently experienced
significant price fluctuations. These fluctuations often have been unrelated  to
the  operating performance  of the specific  companies whose  stocks are traded.
Broad market fluctuations, as well as  economic conditions generally and in  the
semiconductor  industry specifically, may  adversely affect the  market price of
the Company's Common Stock. See "Price Range of Common Stock."

    POTENTIAL ANTI-TAKEOVER  EFFECTS.    Certain  provisions  of  the  Company's
stockholder rights plan, its Certificate of Incorporation and Delaware law could
discourage  potential acquisition proposals and could  delay or prevent a change
in control of the Company. Such provisions could diminish the opportunities  for
a  stockholder to  participate in  tender offers,  including tender  offers at a
price above the then current market  value of the Common Stock. Such  provisions
may  also inhibit increases in  the market price of  the Common Stock that could
result from takeover attempts. In addition, the Company's Board of Directors has
the authority to issue Preferred Stock without any further vote or action by the
stockholders. The issuance of Preferred Stock  may have the effect of  delaying,
deferring  or  preventing a  change in  control of  the Company  without further
action by the  stockholders and could  adversely affect the  rights and  powers,
including  voting rights,  of the  holders of  Common Stock.  Such effects could
result in a  decrease in the  market price  of the Company's  Common Stock.  See
"Description of Capital Stock."

                                       10
<PAGE>
                                USE OF PROCEEDS

    The  net  proceeds  to be  received  by the  Company  from the  sale  of the
2,500,000 shares of Common Stock offered by the Company hereby are estimated  to
be  approximately  $87.1  million  ($100.2  million  if  the  U.S. Underwriters'
over-allotment option is exercised in full) assuming a public offering price  of
$36.75  per share.  The Company  intends to  use the  proceeds of  this offering
primarily for  expansion  and  maintenance  of its  wafer  supply  and  assembly
capacity,   including  funding  a  planned  equity  investment  in  an  advanced
semiconductor manufacturing  facility in  Taiwan,  and other  general  corporate
purposes,  including procurement of additional  capital equipment and facilities
to expand  the Company's  internal manufacturing  capacity, development  of  new
products,  and potential  acquisitions of businesses,  products, or technologies
that would complement the  Company's businesses. See  "Business -- Licenses  and
Agreements  -- UMC." In addition, the Company  from time to time has discussions
with third parties regarding possible arrangements with respect to wafer  supply
and  assembly capacity, such  as purchasing options for  such capacity or making
investments in new  or existing  manufacturing facilities.  Except as  discussed
elsewhere  in this Prospectus, there are no current understandings or agreements
involving purchasing options or making investments with respect to any  material
wafer  supply and assembly arrangements or with respect to business, product, or
technology acquisition transactions. Pending such applications, the net proceeds
from this  offering will  be invested  in bank  deposits and  investment  grade,
interest bearing securities.

                          PRICE RANGE OF COMMON STOCK

   
    The following table sets forth the range of high and low sales prices of the
Company's  Common Stock  for the  indicated periods,  as reported  by The Nasdaq
National Market.  On October  16, 1995,  the last  reported sale  price for  the
Common  Stock on The Nasdaq National Market was $36 3/4 per share. As of October
16, 1995, the  Company had  approximately 297 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 April 2, 1994:
  First Quarter................................................   $20 13/16  $14 11/16
  Second Quarter...............................................    26 3/4     14 3/4
  Third Quarter................................................    24 3/4     12 1/4
  Fourth Quarter...............................................    19 3/8     14
Fiscal year ended April 1, 1995:
  First Quarter................................................    19 5/8     14 3/4
  Second Quarter...............................................    20 1/8     16 1/4
  Third Quarter................................................    19 3/8     15 1/2
  Fourth Quarter...............................................    27 1/8     16 3/8
Fiscal year ending March 30, 1996:
  First Quarter................................................    37 1/8     23
  Second Quarter...............................................    43         28 7/8
  Third Quarter (through October 16, 1995).....................    42 1/8     33
</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 therefore  does not  anticipate
declaring  or paying any cash  dividends on its Common  Stock in the foreseeable
future.

                                       11
<PAGE>
                                 CAPITALIZATION

    The following table sets forth, on  an unaudited basis, the short-term  debt
and  capitalization of  the Company  at September 30,  1995, and  as adjusted to
reflect the sale by the Company of the 2,500,000 shares of Common Stock  offered
hereby  at an assumed public offering price of $36.75 per share (after deducting
underwriting discounts and commissions and estimated offering expenses).

<TABLE>
<CAPTION>
                                                                                AS OF SEPTEMBER 30, 1995
                                                                               --------------------------
                                                                                 ACTUAL    AS ADJUSTED(1)
                                                                               ----------  --------------
                                                                                 (IN THOUSANDS, EXCEPT
                                                                                      SHARE DATA)
<S>                                                                            <C>         <C>
Short-term debt..............................................................  $   --        $   --
Long-term debt...............................................................      --            --
Stockholders' equity:
  Preferred Stock, $.01 par value, 10,000,000 shares authorized; none issued
   and outstanding...........................................................      --            --
  Common Stock, $.01 par value, 100,000,000 shares authorized; 19,502,914
   shares issued and outstanding; 22,002,914 shares issued and outstanding as
   adjusted(2)...............................................................         195           220
  Paid-in capital............................................................      92,381       179,425
  Retained earnings..........................................................      93,430        93,430
                                                                               ----------  --------------
      Total stockholders' equity.............................................     186,006       273,075
                                                                               ----------  --------------
        Total capitalization.................................................  $  186,006    $  273,075
                                                                               ----------  --------------
                                                                               ----------  --------------
<FN>
- ---------
(1)  Assumes the U.S.  Underwriters' over-allotment option  to purchase  375,000
     shares from the Company is not exercised. See "Underwriters."

(2)  Excludes  (i)  2,063,126  shares  of Common  Stock  subject  to outstanding
     options under  the Company's  1988  Stock Incentive  Plan with  an  average
     exercise  price of $19.75 per share and 693,560 shares available for future
     grants of options thereunder as of September 30, 1995; (ii) 133,593  shares
     of  Common Stock reserved  but unissued under  the Company's Employee Stock
     Purchase Plan; (iii) 94,125 shares  of Common Stock subject to  outstanding
     options  under the Company's 1993 Outside  Directors Stock Option Plan with
     an average exercise price of $20.49 per share and 148,500 shares  available
     for  future grants of options thereunder as of September 30, 1995; and (iv)
     123,625 shares of  Common Stock  subject to outstanding  warrants owned  by
     Bain & Company with an average exercise price of $18.76 per share.
</TABLE>

                                       12
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA

    The selected consolidated financial data presented below as of April 2, 1994
and  April 1,  1995, and for  each of the  years in the  three-year period ended
April 1, 1995 have  been derived from the  consolidated financial statements  of
the  Company,  which  have been  audited  by Price  Waterhouse  LLP, independent
accountants, which financial  statements are incorporated  by reference  herein.
The  selected consolidated financial data presented  below as of March 30, 1991,
March 28, 1992  and April 3,  1993, and for  each of the  years in the  two-year
period  ended March  28, 1992 have  also been derived  from audited consolidated
financial statements  of the  Company which  are not  incorporated by  reference
herein.  The selected consolidated financial data  presented below as of October
1, 1994 and September 30,  1995, for the six months  then ended, for the  fiscal
quarters  ended July 1,  1995 and September 30,  1995, and for  each of the four
quarters of  fiscal  1994 and  fiscal  1995  have been  derived  from  unaudited
consolidated  financial  statements  of  the  Company.  In  the  opinion  of the
Company's management, such unaudited  consolidated financial statements  include
all  adjustments, consisting of only  normal recurring adjustments, necessary to
fairly state  the  information set  forth  therein. The  following  consolidated
financial  data should  be read in  conjunction with  the consolidated financial
statements, related  notes  and  other  financial  information  incorporated  by
reference  herein. See  "Incorporation of  Certain Documents  by Reference." 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.
<TABLE>
<CAPTION>
                                                                  FISCAL YEAR ENDED                         SIX MONTHS ENDED
                                              ---------------------------------------------------------  ----------------------
                                               MARCH 30,    MARCH 28,   APRIL 3,   APRIL 2,   APRIL 1,    OCT. 1,    SEPT. 30,
                                                 1991         1992        1993       1994       1995       1994        1995
                                              -----------  -----------  ---------  ---------  ---------  ---------  -----------
                                                                    (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                           <C>          <C>          <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenue.....................................   $  64,539    $  71,009   $ 103,391  $ 126,241  $ 144,083  $  67,477   $  93,621
Costs and expenses:
    Cost of products sold...................      29,919       31,015      43,650     53,266     58,936     27,416      38,959
    Research and development................      10,363       12,535      16,530     20,636     22,859     10,884      13,073
    Selling, general and administrative.....      12,142       14,144      20,465     22,299     25,020     11,838      15,087
                                              -----------  -----------  ---------  ---------  ---------  ---------  -----------
        Total costs and expenses............      52,424       57,694      80,645     96,201    106,815     50,138      67,119
                                              -----------  -----------  ---------  ---------  ---------  ---------  -----------
Income from operations......................      12,115       13,315      22,746     30,040     37,268     17,339      26,502
Interest and other income, net..............       2,439        2,420       2,470      2,566      3,349      1,402       1,932
                                              -----------  -----------  ---------  ---------  ---------  ---------  -----------
Income before provision for income taxes....      14,554       15,735      25,216     32,606     40,617     18,741      28,434
Provision for income taxes..................       4,257        4,880       7,817     10,116     13,651      6,323       9,810
                                              -----------  -----------  ---------  ---------  ---------  ---------  -----------
Net income..................................   $  10,297    $  10,855   $  17,399  $  22,490  $  26,966  $  12,418   $  18,624
                                              -----------  -----------  ---------  ---------  ---------  ---------  -----------
                                              -----------  -----------  ---------  ---------  ---------  ---------  -----------
Net income per share........................   $    0.61    $    0.61   $    0.94  $    1.19  $    1.41  $    0.65   $    0.93
                                              -----------  -----------  ---------  ---------  ---------  ---------  -----------
                                              -----------  -----------  ---------  ---------  ---------  ---------  -----------
Weighted average common and common
  equivalent shares outstanding.............      16,770       17,834      18,458     18,946     19,164     19,073      20,117

<CAPTION>

                                                                        AS OF                                    AS OF
                                              ---------------------------------------------------------  ----------------------
                                               MARCH 30,    MARCH 28,   APRIL 3,   APRIL 2,   APRIL 1,    OCT. 1,    SEPT. 30,
                                                 1991         1992        1993       1994       1995       1994        1995
                                              -----------  -----------  ---------  ---------  ---------  ---------  -----------
                                                                               (IN THOUSANDS)
<S>                                           <C>          <C>          <C>        <C>        <C>        <C>        <C>

CONSOLIDATED BALANCE SHEET DATA:
Working capital.............................   $  51,770    $  64,297   $  79,878  $ 105,007  $ 106,021  $ 102,317   $ 138,050
Total assets................................      79,081       91,653     128,876    146,093    192,917    169,884     225,768
Long-term lease obligations, excluding
  current portion...........................         566          205      --         --         --         --          --
Stockholders' equity........................      63,230       75,643      98,481    125,068    157,797    140,013     186,006
</TABLE>

                                       13
<PAGE>
    The following table presents unaudited  quarterly results in dollar  amounts
and as a percentage of revenue for the Company's last ten fiscal quarters.
<TABLE>
<CAPTION>
                                                                          QUARTER ENDED
                                  ---------------------------------------------------------------------------------------------
                                                     FISCAL                                          FISCAL
                                                      1994                                            1995
                                  ---------------------------------------------   ---------------------------------------------
                                   JULY 3,     OCT. 2,     JAN. 1,     APR. 2,     JULY 2,     OCT. 1,    DEC. 31,     APR. 1,
                                    1993        1993        1994        1994        1994        1994        1994        1995
                                  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
                                                              (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                               <C>         <C>         <C>         <C>         <C>         <C>         <C>         <C>
CONSOLIDATED STATEMENT OF
  OPERATIONS DATA:
Revenue.........................   $33,345     $34,136     $28,573     $30,187     $32,913     $34,564     $36,288     $40,318
Costs and expenses:
    Cost of products sold.......    14,241      14,509      12,070      12,446      13,418      13,998      14,810      16,710
    Research and development....     5,425       5,428       4,797       4,986       5,306       5,578       5,790       6,185
    Selling, general and
     administrative.............     5,949       5,897       5,113       5,340       5,769       6,069       6,283       6,899
                                  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
        Total costs and
         expenses...............    25,615      25,834      21,980      22,772      24,493      25,645      26,883      29,794
                                  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
Income from operations..........     7,730       8,302       6,593       7,415       8,420       8,919       9,405      10,524
Interest and other income, net..       608         663         668         627         669         733         895       1,052
                                  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
Income before provision for
  income taxes..................     8,338       8,965       7,261       8,042       9,089       9,652      10,300      11,576
Provision for income taxes......     2,668       2,868       2,178       2,402       3,090       3,233       3,450       3,878
                                  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
Net income......................   $ 5,670     $ 6,097     $ 5,083     $ 5,640     $ 5,999     $ 6,419     $ 6,850     $ 7,698
                                  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
                                  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
Net income per share............   $  0.30     $  0.32     $  0.27     $  0.30     $  0.32     $  0.34     $  0.36     $  0.40
                                  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
                                  ---------   ---------   ---------   ---------   ---------   ---------   ---------   ---------
Weighted average common and
  common equivalent shares
  outstanding...................    18,896      19,051      18,918      18,925      19,002      19,145      19,134      19,467

<CAPTION>

                                         FISCAL
                                          1996
                                  ---------------------
                                   JULY 1,    SEPT. 30,
                                    1995        1995
                                  ---------   ---------

<S>                               <C>         <C>
CONSOLIDATED STATEMENT OF
  OPERATIONS DATA:
Revenue.........................   $45,013     $48,608
Costs and expenses:
    Cost of products sold.......    18,769      20,190
    Research and development....     6,383       6,690
    Selling, general and
     administrative.............     7,371       7,716
                                  ---------   ---------
        Total costs and
         expenses...............    32,523      34,596
                                  ---------   ---------
Income from operations..........    12,490      14,012
Interest and other income, net..     1,015         917
                                  ---------   ---------
Income before provision for
  income taxes..................    13,505      14,929
Provision for income taxes......     4,659       5,151
                                  ---------   ---------
Net income......................   $ 8,846     $ 9,778
                                  ---------   ---------
                                  ---------   ---------
Net income per share............   $  0.45     $  0.49
                                  ---------   ---------
                                  ---------   ---------
Weighted average common and
  common equivalent shares
  outstanding...................    19,811      20,119
</TABLE>

<TABLE>
<CAPTION>
                                                                   AS A PERCENTAGE OF REVENUE
                                  --------------------------------------------------------------------------------------------
<S>                               <C>      <C>      <C>      <C>      <C>      <C>      <C>        <C>      <C>      <C>
CONSOLIDATED STATEMENT OF
  OPERATIONS DATA:
Revenue.........................   100.0%   100.0%   100.0%   100.0%   100.0%   100.0%   100.0%     100.0%   100.0%   100.0%
Costs and expenses:
    Cost of products sold.......    42.7%    42.5%    42.2%    41.2%    40.8%    40.5%    40.8%      41.5%    41.7%    41.5%
    Research and development....    16.3%    15.9%    16.8%    16.5%    16.1%    16.1%    16.0%      15.3%    14.2%    13.8%
    Selling, general and
     administrative.............    17.8%    17.3%    17.9%    17.7%    17.5%    17.6%    17.3%      17.1%    16.4%    15.9%
                                  -------  -------  -------  -------  -------  -------  --------   -------  -------  ---------
        Total costs and
         expenses...............    76.8%    75.7%    76.9%    75.4%    74.4%    74.2%    74.1%      73.9%    72.3%    71.2%
                                  -------  -------  -------  -------  -------  -------  --------   -------  -------  ---------
Income from operations..........    23.2%    24.3%    23.1%    24.6%    25.6%    25.8%    25.9%      26.1%    27.7%    28.8%
Interest and other income, net..     1.8%     2.0%     2.3%     2.1%     2.0%     2.1%     2.5%       2.6%     2.3%     1.9%
                                  -------  -------  -------  -------  -------  -------  --------   -------  -------  ---------
Income before provision for
  income taxes..................    25.0%    26.3%    25.4%    26.7%    27.6%    27.9%    28.4%      28.7%    30.0%    30.7%
Provision for income taxes......     8.0%     8.4%     7.6%     8.0%     9.4%     9.3%     9.5%       9.6%    10.3%    10.6%
                                  -------  -------  -------  -------  -------  -------  --------   -------  -------  ---------
Net income......................    17.0%    17.9%    17.8%    18.7%    18.2%    18.6%    18.9%      19.1%    19.7%    20.1%
                                  -------  -------  -------  -------  -------  -------  --------   -------  -------  ---------
                                  -------  -------  -------  -------  -------  -------  --------   -------  -------  ---------
</TABLE>

                                       14
<PAGE>
                                    BUSINESS

GENERAL
    Lattice  Semiconductor Corporation  (the "Company")  is the  world's leading
supplier of  in-system  programmable ("ISP")  logic  devices and  pioneered  the
application   of   electrically   erasable  CMOS   ("E(2)CMOS")   technology  to
programmable logic.  The Company  designs, develops  and markets  both  high-and
low-density,  high performance E(2)CMOS programmable  logic devices ("PLDs") and
related development system software. PLDs are standard semiconductor  components
that  can be  configured by  the end customer  as specific  logic circuits. PLDs
enable the end  customer to shorten  design cycle times  and reduce  development
costs.

PLD MARKET BACKGROUND
    Three  principal  types  of digital  integrated  circuits are  used  in most
electronic systems: microprocessors, memory and logic. Microprocessors are  used
for   control  and  computing  tasks,  memory   is  used  to  store  programming
instructions and  data, and  logic is  employed to  manage the  interchange  and
manipulation  of  digital  signals  within  a  system.  Logic  circuits  contain
interconnected groupings of  simple logical  "AND" and  logical "OR"  functions,
commonly  described as  "gates". Typically,  complex combinations  of individual
gates are  required to  implement the  specialized logic  circuits required  for
systems  applications. While system  designers use a  relatively small number of
standard architectures  to  meet their  microprocessor  and memory  needs,  they
require  a  wide variety  of  logic circuits  in  order to  achieve  end product
differentiation.

    Logic circuits  are found  in a  wide range  of today's  electronic  systems
including  communications  equipment,  computers,  peripherals, instrumentation,
industrial control and military systems. According to Dataquest Incorporated,  a
semiconductor market research firm, logic accounted for approximately 32% of the
estimated  $79 billion worldwide digital integrated  circuit market in 1994. The
logic market encompasses, among  other segments, standard  transistor-transistor
logic   ("TTL"),  custom-designed   application  specific   integrated  circuits
("ASICs", which include conventional gate-arrays, standard cells and full custom
logic circuits), and PLDs. Logic circuits are often classified by the number  of
gates  per circuit, with TTL circuits typically containing up to 100 gates, PLDs
offering up  to 20,000  gates, and  conventional gate  arrays and  custom  logic
circuits reaching up to to several hundred thousand gates.

    Manufacturers  of electronic  systems are  increasingly challenged  to bring
differentiated products  to market  quickly. These  competitive pressures  often
preclude  the use of  custom-designed ASICs, which  generally entail significant
design risks and time delay. Standard logic products, an alternative to  custom-
designed  ASICs, limit a  manufacturer's flexibility to  adequately customize an
end system.  Programmable  logic  addresses  this  inherent  dilemma.  PLDs  are
standard  products, purchased by systems manufacturers  in a "blank" state, that
can be custom  configured into a  virtually unlimited number  of specific  logic
circuits  by programming  the device with  electrical signals.  PLDs give system
designers the  ability to  quickly create  their own  custom logic  circuits  to
provide  product differentiation and rapid time to market. Certain PLD products,
including  the  Company's,  are  reprogrammable,  which  means  that  the  logic
configuration can be modified, if needed, after the initial logic programming. A
recent   technology   development,   in-system   programmability,   extends  the
flexibility of standard reprogrammable PLDs  by allowing the system designer  to
configure  and reconfigure the logic functions of the PLD with a standard 5-volt
power supply without removing the PLD from the system board.

    Several common  types of  PLDs currently  coexist in  the marketplace,  each
offering  customers a particular set of benefits. These include low-density PLDs
(less than  1,000  gates) and  high-density  PLDs (greater  than  1,000  gates).
High-density  PLDs include both  complex PLDs ("CPLDs," up  to 14,000 gates) and
field programmable gate arrays ("FPGAs," up to 20,000 gates).

    Low-density devices are typically  based on industry standard  architectures
and  include the  GAL ("Generic  Array Logic")  product family  developed by the
Company. These  architectures are  familiar  to most  system designers  and  are
supported  by standard widely available  development tools. Offering the highest
absolute performance and  lowest cost per  device, these products  are the  most
effective  PLD solution  to support  simple logic  functions in  all systems and
complex logic  functions  in  systems  with fast  clock  rates,  such  as  those
supporting state-of-the-art microprocessors.

                                       15
<PAGE>
    High-density  devices are  typically based on  proprietary architectures and
require  support   from  sophisticated   computer  aided   engineering   ("CAE")
development  tools. Due  to their higher  levels of  logic integration, absolute
performance levels typically lag those  of state-of-the-art low-density PLDs  by
one  or more  technology generations.  However, in  situations requiring complex
logic functions, high-density PLDs can provide important advantages over the use
of a  large cluster  of  low-density devices.  These advantages  include  system
performance enhancement and power and cost savings.

    CPLDs and FPGAs are the two primary types of high-density PLD architectures.
CPLD  and FPGA architectures are generally  optimal for different types of logic
functions,  although  many  logic  functions  can  be  implemented  with  either
architecture.  CPLDs are characterized by a  regular building block structure of
wide-input logic  cells,  termed macrocells,  and  use of  a  centralized  logic
interconnect  scheme. CPLDs are optimal for  control logic applications, such as
state machines, bus arbitration, encoders and decoders and sequencers. FPGAs are
characterized by a narrow-input  logic cell and  use a distributed  interconnect
scheme.   FPGAs  are  optimal  for  register   intensive  and  data  path  logic
applications such  as  interface logic  and  arithmetic functions.  The  Company
believes  that a substantial portion of  high-density PLD customers utilize both
CPLD and FPGA architectures  within a single  system design, partitioning  logic
functions  across multiple  devices to  optimize overall  system performance and
cost.

TECHNOLOGY
    The Company believes that E(2)CMOS  is the preferred process technology  for
both  high-density CPLDs and  low-density PLDs due  to its inherent performance,
reprogrammability and testability  benefits. E(2)CMOS,  through its  fundamental
ability to be programmed and erased electronically, serves as the foundation for
the Company's ISP technology.

    IN-SYSTEM PROGRAMMABLE (ISP) TECHNOLOGY
    The  Company has pioneered the development of ISP, a proprietary technology,
which affords it  a competitive advantage  in the high-density  CPLD market.  In
contrast  to  standard  PLD  programming  technologies,  ISP  allows  the system
designer to configure and reconfigure the  PLD without removing the device  from
the  system board. Standard E(2)CMOS  programmable logic devices require 12-volt
electrical signals and therefore must be removed from the printed circuit  board
and programmed using stand alone, specialized hardware, while ISP devices can be
programmed with standard 5-volt electrical signals. ISP enhances the flexibility
of  PLDs,  providing a  number of  important benefits  to a  system manufacturer
across the full spectrum  of an electronic system  product cycle. ISP can  allow
customers  to  reduce  design cycle  times,  accelerate time  to  market, reduce
prototyping costs, reduce manufacturing costs and lower inventory  requirements.
ISP  can  also  provide  customers the  opportunity  to  perform  simplified and
cost-effective field reconfiguration through a data file transferred by computer
disk or telephone line.  All of the Company's  high-density CPLDs are  available
with  ISP  technology.  The Company  also  offers its  most  popular low-density
architecture, the GAL22V10, with ISP technology.

    E(2)CMOS PROCESS TECHNOLOGY
    The Company's current high- and low-density  PLD offerings are based on  the
Company's   proprietary  E(2)CMOS   manufacturing  process   technology,  termed
UltraMOS-Registered Trademark-.  The  Company's  current  production  processes,
UltraMOS  IV and UltraMOS  V, are sub-micron CMOS  technologies. The Company has
recently released  to production  UltraMOS VI,  an advanced  sub-micron  process
technology designed to enhance product performance and densities.

    In comparison to bipolar technology, at one time the dominant technology for
low-density  PLDs, E(2)CMOS  technology consumes  less power  and generates less
heat  while  operating  at  comparable  speed.  Additionally,  in  contrast   to
one-time-programmable  bipolar  PLDs,  E(2)CMOS  PLDs  are  fully  erasable  and
reprogrammable, providing greater end  customer design flexibility and  allowing
the  PLD manufacturer to fully test all  programmable elements in a device prior
to shipment. An  alternative CMOS  technology, Erasable  Programmable Read  Only
Memory  ("EPROM"), provides the same low power consumption benefits as E(2)CMOS,
but requires  ultraviolet light  exposure for  erasure, necessitating  expensive
quartz  windowed packages and  limiting testability. Antifuse  and Static Random
Access Memory  ("SRAM")  technologies,  used primarily  in  the  manufacture  of
high-density FPGAs, offer certain advantages for very dense

                                       16
<PAGE>
logic  devices, but also have significant drawbacks when compared with E(2)CMOS.
Antifuse technology is non-erasable,  non-reprogrammable and subject to  lengthy
initial   programming  times  that   can  hinder  usage   in  volume  production
applications. SRAM  technology  is volatile  (erases  when electrical  power  is
removed),  and as such  programmable SRAM FPGAs  require additional non-volatile
memory, typically on  a separate device,  to store programming  code. This  adds
cost  and printed circuit board area to a design, and results in the devices not
being completely functional at initial system power-up.

PRODUCTS

    HIGH-DENSITY CPLDS

    SILICON.  In fiscal 1993, the Company entered the high-density PLD market by
releasing to  production its  ispLSI 1000  product family,  consisting of  eight
devices. The ispLSI 1000 product family, based on an innovative proprietary CPLD
architecture  incorporating  familiar  GAL-like  logic  building  blocks, offers
performance of up to 110 MHz, with propagation delays as low as 10  nanoseconds,
densities  of 2,000 to 8,000  gates, and is available  in surface mount packages
ranging from 44- to 128-pins. The  Company is currently shipping over 60  speed,
package and temperature range combinations of the ispLSI 1000 family.

    In  fiscal 1994, the Company announced two new ispLSI families, the 2000 and
3000 series.  The ispLSI  2000 family,  containing eight  devices, targets  CPLD
performance leadership, providing performance of up to 154 MHz, with propagation
delays  as low as 5.5 nanoseconds, densities of 1,000 to 4,000 gates, and 44- to
128-pin standard  surface  mount packages.  It  is the  first  high-density  PLD
architecture  capable of supporting advanced  microprocessors operating at clock
speeds over 75 MHz, such as  Pentium, PowerPC and other RISC-based systems.  The
ispLSI  3000 family, initially containing  six devices, incorporates an enhanced
logic architecture  to  target  CPLD density  leadership  while  retaining  high
performance. It offers densities of 8,000 to 14,000 gates, and performance of up
to  100 MHz, with propagation delays as low as 10 nanoseconds. Available in 128-
to 208-pin surface mount  packages, the 3000  family also incorporates  boundary
scan  test, an  attractive feature  that provides  enhanced testing capabilities
important for complex systems. The Company is currently shipping over 30  speed,
package and temperature range combinations of the ispLSI 2000 and 3000 families.
The  Company  plans  to  continue  to  introduce  new  families  of high-density
products, as well as improving the performance of existing product families,  to
meet market needs.

    SOFTWARE  DEVELOPMENT TOOLS.  All of the Company's high-density products are
supported by the Company's pDS-Registered Trademark- software development  tools
and  pDS+-TM-  software  development  tools (referred  to  as  "fitters"). First
introduced in fiscal 1992, pDS software allows a customer to enter and verify  a
logic  design, perform logic minimization,  assign input/output ("I/O") pins and
critical speed paths, and execute automatic  place and route tasks. Designed  to
be  a low cost, fully integrated development  tool, pDS runs under the Microsoft
Windows operating system on a personal computer. First introduced in fiscal year
1994, pDS+  software supports  most  popular third  party CAE  development  tool
environments   running  on  IBM   compatible  personal  computers   as  well  as
workstations from Sun  Microsystems and Hewlett-Packard.  Designed to provide  a
low  cost method  to incorporate the  Company's high-density  CPLD products into
standard development environments, pDS+  software leverages customers'  existing
investment  in  third-party CAE  tools.  The Company  also  provides ispCODE-TM-
software, a product  that supports  in-system programming of  the Company's  ISP
devices.

    During  fiscal 1995, the  Company released new versions  of all its existing
pDS and pDS+  software development tools  to enhance performance,  functionality
and  ease of use. The Company offers pDS+ products supporting common third party
CAE design tool environments, including Cadence, CUPL,
Data I/O ABEL, Data  I/O Synario, Isdata, Mentor  Graphics, OrCAD, Synopsys  and
ViewLogic.  The Company also  enhanced its ISP  programming support by releasing
ispTEST-TM- software, a product that enables ISP to be integrated into automatic
test equipment ("ATE")  on the manufacturing  floor. Currently ispTEST  supports
ATE equipment from Genrad, Hewlett-Packard and Teradyne.

    During  the twelve months ended September  30, 1995, the number of installed
seats of the Company's software development  tools, as measured by the  Company,
has  grown  from over  3,000 to  over 7,000.  The Company  plans to  continue to
enhance and expand its development tool offerings during fiscal 1996.

                                       17
<PAGE>
    LOW-DENSITY PLDS
    The Company offers  the industry's  broadest line of  low-density CMOS  PLDs
based  on its  16 families  of GAL  products offered  in over  150 speed, power,
package and temperature range combinations. GAL devices range in complexity from
approximately 200 to 1,000 logic gates  and are typically assembled in 20-,  24-
and 28-pin standard dual in-line packages and in 20- and 28-pin standard plastic
leaded  chip carrier packages. The Company offers the industry standard GAL16V8,
GAL20V8, GAL22V10, GAL20RA10 and GAL20XV10  architectures in a variety of  speed
grades, with propagation delays as low as 5 nanoseconds, the highest performance
in  the  industry.  The  Company  also  offers  several  innovative  proprietary
extension  architectures,  the   ispGAL22V10,  GAL26CV12,  GAL18V10,   GAL16VP8,
GAL20VP8,  GAL6001/2,  GAL16V8Z and  GAL20V8Z, each  of  which is  optimized for
specific applications. These product families offer industry leading performance
levels, typically with propagation delays as low as 7.5 nanoseconds.

    Beginning in fiscal 1995, the Company extended its GAL line by introducing a
family of 3.3-volt industry standard  architectures, the GAL16LV8, GAL20LV8  and
the  GAL22LV10 in a variety  of speed grades, with  propagation delays as low as
3.5 nanoseconds, the highest performance in  the industry. Offered with a  range
of power consumption specifications, these devices are targeted towards emerging
high-growth,  low-voltage system applications in the computing and communication
markets. The Company is currently selling the GAL16LV8D-3.5, the world's fastest
PLD available  in any  technology or  operating voltage.  The Company  plans  to
continue  to maintain a  broad offering of  performance leadership, standard and
proprietary architecture low-density CMOS PLDs.

    The Company's GAL products are  supported by industry standard software  and
hardware  development tools  marketed by  independent manufacturers specifically
for PLD applications.

PRODUCT DEVELOPMENT
    The Company places great emphasis  on product development and believes  that
continued  investment in  the development  of new  products that  exploit market
trends is required to maintain  its competitive position. The Company's  product
development  activities  emphasize new  high-density  PLDs, improvements  of its
proprietary E(2)CMOS processes and ISP technologies, performance enhancement and
cost reduction  of  existing products,  and  extension and  enhancement  of  its
software   development  tools.  Product  development  activities  occur  in  the
Company's Hillsboro,  Oregon  headquarters,  its  Milpitas,  California  product
development center, and its Shanghai, China design center.

    Research  and development expenses were  $16.5 million, $20.6 million, $22.9
million and $13.1 million  in fiscal years  1993, 1994, 1995  and the first  six
months  of fiscal  1996, respectively. The  Company expects to  continue to make
significant investments in research and development in the future.

OPERATIONS
    The Company  does  not  manufacture  its silicon  wafers.  The  Company  has
historically   maintained  strategic  relationships   with  large  semiconductor
manufacturers in  order to  source  its finished  silicon wafers,  allowing  the
Company  to  focus  its  internal  resources  on  product,  process  and  market
development. In  addition, assembly  is  performed for  the Company  by  outside
suppliers.  The Company  performs most test  operations and  all reliability and
quality assurance  processes internally,  as  the Company  believes it  can  add
significant  customer value in  these areas. In fiscal  1994, the Company became
the first domestic  PLD company  to achieve  ISO 9001  quality registration,  an
indication of the Company's high internal operational standards.

    WAFER FABRICATION
    All  of the Company's  silicon wafer requirements  are currently supplied by
Seiko Epson in Japan  pursuant to an  agreement with S  MOS, an affiliated  U.S.
distributor  of Seiko  Epson. See "--  Licenses and Agreements  -- Seiko Epson/S
MOS." The Company negotiates  wafer volumes, prices and  terms with Seiko  Epson
and S MOS on a periodic basis. In addition, the Company entered into a series of
agreements  with UMC in September 1995 pursuant  to which the Company has agreed
to join UMC and several other companies to form a separate Taiwanese company for
the purpose of  building and operating  an advanced semiconductor  manufacturing
facility  in Taiwan, Republic of China. As a result of its equity ownership, the
Company will receive  rights to purchase  at market prices  a percentage of  the
facility's wafer production. In a

                                       18
<PAGE>
related  agreement,  UMC has  committed to  supply  the Company  with sub-micron
wafers beginning  in the  first calendar  quarter of  1996 and  continuing  with
phased  increases for several  years, until such capacity  is available from the
new facility. Wafer prices and other  terms are expected to be negotiated  prior
to initiating wafer production and will be subject to periodic adjustment. See "
- --  Licenses and Agreements  -- UMC." A significant  interruption in supply from
Seiko Epson through S MOS  or from UMC would have  a material adverse effect  on
the Company's business. See "Risk Factors -- Dependence on Wafer Suppliers."

    ASSEMBLY
    After  wafer fabrication  and initial testing,  the Company  ships wafers to
independent subcontractors for assembly.  During assembly, wafers are  separated
into  individual die and encapsulated in plastic or ceramic packages. Presently,
the Company  has  qualified  long  term assembly  partners  in  Hong  Kong,  the
Philippines, South Korea and the United States.

    TESTING
    The  Company electrically tests the die on  each wafer prior to shipment for
assembly. Following assembly, prior to customer shipment, each product undergoes
final  testing  using  sophisticated  test  equipment,  techniques  and  quality
assurance procedures developed by the Company. Final testing on certain products
is  performed at independent contractors in the Philippines, South Korea and the
United States.

MARKETING, SALES AND CUSTOMERS
    The Company sells its products directly  to end customers through a  network
of  independent  sales  representatives  and  indirectly  through  a  network of
distributors.  The  Company  utilizes  a  direct  sales  management  and   field
applications   engineering  organization  in   combination  with  manufacturer's
representatives and  distributors  to  reach  a  broad  base  of  potential  end
customers.   The  Company's  end  customers  are  primarily  original  equipment
manufacturers  in  the   fields  of   communications,  computing,   peripherals,
instrumentation,  industrial controls and military systems. The Company believes
its distribution channel is a cost-effective means of reaching end customers.

    On September 30,  1995, the Company  had 19 sales  representatives and  five
distributors   in  the  United  States  and  Canada.  In  North  America,  Arrow
Electronics, Inc.,  Hamilton Hallmark,  Insight Electronics,  Inc. and  Marshall
Industries  provide nationwide  distribution, while  Future Electronics provides
regional distribution  coverage in  Canada. The  Company has  established  sales
channels  in  over 25  foreign  countries through  a  network of  over  30 sales
representatives and distributors. Approximately one-half of the Company's  North
American sales and most of its foreign sales are made through distributors.

    The Company protects each of its North American distributors and some of its
foreign  distributors  against reductions  in published  prices, and  expects to
continue this policy in the foreseeable future. The Company also allows  returns
from  these distributors of unsold products  under certain conditions. For these
reasons, the Company  does not recognize  revenue until products  are resold  by
these distributors.

    The Company provides technical and marketing assistance to its end customers
and sales force with engineering staff based in the Company's offices in Oregon,
California  and selected field sales offices.  The Company maintains 17 domestic
and international sales  offices where  the Company's field  sales managers  and
applications  engineers are based. These offices are located in the metropolitan
areas of Atlanta, Austin, Boston, Chicago, Dallas, Los Angeles, Minneapolis, New
York, Orlando, Portland, San Jose, Hong  Kong, London, Munich, Paris, Seoul  and
Tokyo.

    International revenues, including those from Canada, accounted for 45%, 43%,
47%  and 49% of the Company's revenues in  fiscal 1993, 1994, 1995 and the first
six months  of  fiscal  1996,  respectively. Revenues  from  Europe  were  $13.1
million,  $16.1 million,  $24.5 million  and $17.8  million, and  from Asia were
$32.7 million, $34.3 million, $40.6 million  and $26.4 million, in fiscal  1993,
1994,  1995  and  the  first  six  months  of  fiscal  1996,  respectively. Both
international and domestic revenues are generally invoiced in U.S. dollars  with
the exception of sales in Japan which are invoiced in yen.

                                       19
<PAGE>
    The  Company's products are sold to a  large and diverse group of customers.
Two distributors accounted for approximately 11% each of revenue in fiscal 1993,
approximately 12% and 10% in fiscal 1994 and approximately 12% and 11% in fiscal
1995. No individual  customer accounted for  more than 5%  of revenue in  fiscal
1995.

    The  Company's  sales are  primarily  executed against  purchase  orders for
standard  products.  Customers   frequently  revise   quantities  and   delivery
schedules,  without penalty. The Company therefore does not believe that backlog
as of any given date is indicative of future revenue.

COMPETITION
    The  semiconductor  industry  overall   is  intensely  competitive  and   is
characterized by rapid technological change, rapid rates of product obsolescence
and  price erosion.  The Company's current  and potential  competitors include a
broad range of  semiconductor companies,  ranging from  very large,  established
companies   to  emerging  companies,  many  of  which  have  greater  financial,
technical, manufacturing, marketing and sales resources than the Company.

    The principal competitive  factors in  the CMOS PLD  market include  product
features,  price,  customer  support,  and  sales,  marketing  and  distribution
strength. In the high-density segment, the availability of competitive  software
development  tools is  also critical.  In addition  to product  features such as
speed, power consumption, reprogrammability, design flexibility and reliability,
competition in the PLD market occurs on the basis of price and market acceptance
of specific  products and  technology.  The Company  believes that  it  competes
favorably with respect to each of these factors. The Company intends to continue
to address these competitive factors by working to continually introduce product
enhancements  and new products, by seeking to establish its products as industry
standards  in  their  respective   markets,  and  by   working  to  reduce   the
manufacturing cost of its products over their life cycle.

    In the high-density PLD market, the Company competes directly primarily with
Advanced  Micro Devices ("AMD")  and Altera, both of  which offer competing CPLD
products. The  Company  also  competes indirectly  with  manufacturers  of  FPGA
devices such as Actel, AT&T, and Xilinx as well as other semiconductor companies
providing  non-PLD  based  logic  solutions.  As  the  Company  and  these other
companies seek to expand their markets, competition may increase.

    In the low-density PLD  market, the Company competes  primarily with AMD,  a
licensee  of the  Company's GAL  patents, which offers  a full  line of E(2)CMOS
GAL-compatible PLDs.  Altera, Atmel  and  Cypress Semiconductor  offer  products
based  on similar  and competing  CMOS technologies  and architectures, however,
these companies do not offer full product lines.

    Although to date  the Company  has not  experienced significant  competition
from  companies located outside  the United States, such  companies may become a
more significant  competitive factor  in  the future.  As  the Company  and  its
current  competitors seek to expand their markets, competition may increase. Any
such increases  in  competition  could  have  material  adverse  effect  on  the
Company's operating results.

PATENTS
    The  Company seeks  to protect  its products  and wafer  fabrication process
technology primarily through patents,  trade secrecy measures, copyrights,  mask
work protection, trademark registrations, licensing restrictions,
confidentiality  agreements and other approaches designed to protect proprietary
information. There can be no assurance that others may not independently develop
competitive technology not  covered by  the Company's patents  or that  measures
taken by the Company to protect its technology will be effective.

    The  Company holds 32 domestic and European  patents on its PLD products and
has a number  of patent  applications pending in  the United  States, Japan  and
under  the European  Patent Convention. There  can be no  assurance that pending
patent applications  or other  applications that  may be  filed will  result  in
issued  patents, or  that any  issued patents  will survive  challenges to their
validity. Although the Company believes that  its patents have value, there  can
be  no assurance that the Company's patents,  or any additional patents that may
be issued in the  future, will provide  meaningful protection from  competition.
The  Company  believes  its success  will  depend primarily  upon  the technical
expertise, experience, creativity and the  sales and marketing abilities of  its
personnel.

                                       20
<PAGE>
    Patent  and other proprietary  rights infringement claims  are common in the
semiconductor industry. The Company has  received a letter from a  semiconductor
manufacturer  stating  that it  believes  a number  of  its patents,  related to
product packaging,  cover  certain  products  sold by  the  Company.  While  the
manufacturer  has offered  to license  certain of  such patents  to the Company,
there can be no assurance, on this or any other claim which may be made  against
the  Company,  that  the  Company  could obtain  a  license  on  terms  or under
conditions that would be favorable to the Company.

LICENSES AND AGREEMENTS

    SEIKO EPSON/S MOS
    S MOS, an affiliated U.S. distributor of Seiko Epson, has agreed to  provide
manufactured  wafers to  the Company  in quantities  based on  six-month rolling
forecasts provided by  the Company.  The Company  has committed  to buy  certain
minimum  quantities of wafers per month. The Company's products are manufactured
in Japan at  Seiko Epson's  wafer fabrication  facilities and  delivered to  the
Company  by S MOS.  Prices for the wafers  obtained from S  MOS are reviewed and
adjusted periodically  and  may  be  adjusted  to  reflect  prevailing  currency
exchange  rates. See "Risk Factors --  Dependence on Wafer Suppliers." Daniel S.
Hauer, a member of the Company's Board of Directors, is Chairman of the Board of
Directors of S MOS.

    In July  1994,  the  Company  entered into  an  advance  production  payment
agreement with Seiko Epson and S MOS, under which it advanced to Seiko Epson $42
million  during fiscal  1995 to  be used  by Seiko  Epson to  finance additional
sub-micron semiconductor wafer  manufacturing capacity. Under  the terms of  the
agreement,  the advances  are to  be repaid in  the form  of advanced technology
sub-micron semiconductor wafers. Subject to certain conditions set forth in  the
agreement,  Seiko Epson  has agreed  to supply,  and the  Company has  agreed to
receive, such wafers at a price (in Japanese yen) and volume expected to achieve
full repayment of the advance over a three- to four-year period. In  conjunction
with  the advance production payment agreement, the Company also paid $2 million
during fiscal 1995 for the development of sub-micron process technology and  the
fabrication  of engineering  wafers to  be delivered  over the  same period. The
agreement calls for wafers to be supplied by Seiko Epson through S MOS  pursuant
to a purchase agreement concluded with S MOS.

    UMC
    The  Company entered into a series of  agreements with UMC in September 1995
pursuant to which the Company has agreed to join UMC and several other companies
to form a separate Taiwanese company  for the purpose of building and  operating
an  advanced semiconductor manufacturing facility  in Taiwan, Republic of China.
Under the terms of the agreement,  the Company will invest $60 million,  payable
in  three installments  over the  next two and  a half  years, for  a 10% equity
interest in the venture. As a result  of its equity ownership, the Company  will
receive rights to purchase at market prices a percentage of the facility's wafer
production.  The  proposed  facility  is  expected  to  commence  production  of
eight-inch sub-micron wafers during  the second half of  1997. Formation of  the
venture  is subject  to a number  of conditions, including  receipt of requisite
governmental approvals.

    In a  related  agreement, UMC  has  committed  to supply  the  Company  with
sub-micron wafers beginning in the first calendar quarter of 1996 and continuing
with  phased increases for several years,  until such capacity is available from
the new facility.  The Company is  currently engaged in  qualifying its  process
technology  with UMC in anticipation of  starting volume wafer production. Wafer
prices, and other terms, are expected to be negotiated prior to initiating wafer
production and will be subject to periodic adjustment.

    AMD
    In November 1987, as  part of the settlement  of a patent infringement  suit
against   the  Company,  the  Company   and  Monolithic  Memories  Inc.  ("MMI",
subsequently merged with  AMD) entered  into an  agreement cross-licensing  each
other's  patents covering programmable and reprogrammable logic devices based on
patent applications  having a  first filing  date prior  to November  1989.  The
agreement  was subsequently  amended in  May 1989  by the  Company and  AMD, the
successor to the rights  and obligations of MMI  in the original agreement.  The
amendment  covers  those patents  relating to  PLD products  which are  based on
patent applications  originally filed  by  the Company,  MMI  and AMD  prior  to
December  31,  1991. The  license terminates,  with  respect to  certain patents
asserted by AMD, to cover the Company's current

                                       21
<PAGE>
principal products if the  Company is acquired  by a semiconductor  manufacturer
with  sales  in excess  of  a stated  amount or  by  certain types  of companies
headquartered in  designated Asian  countries. No  license has  been granted  to
either  party  for  any copyright  work,  trademark or  process  technology and,
therefore, AMD has not been licensed to use the GAL trademark on its products.

EMPLOYEES
    As of  September 30,  1995, the  Company had  452 full-time  employees.  The
Company believes that its future success will depend, in part, on its ability to
continue   to  attract  and  retain  highly  skilled  technical,  marketing  and
management personnel.

    None of  the  Company's employees  is  subject to  a  collective  bargaining
agreement.  The Company has never experienced  a work stoppage and considers its
employee relations good.

PROPERTIES
    The Company's  corporate  offices and  testing  and principal  research  and
design  facilities are located in two adjacent buildings owned by the Company in
Hillsboro, Oregon  comprising  a total  of  90,000 square  feet.  The  Company's
executive,  administrative, marketing and production activities are also located
at these facilities. The Company also  leases a 41,000 square foot research  and
design facility in Milpitas, California under a five-year lease which expires in
August 1998.

    The  Company leases space in various locations  in the United States for its
domestic sales offices,  and also  leases space  in Hong  Kong, London,  Munich,
Paris,  Seoul and Tokyo for  its foreign sales offices.  The Company also owns a
13,000 square foot  research and  development facility  and approximately  6,000
square feet of dormitory facilities in Shanghai.

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<PAGE>
                          DESCRIPTION OF CAPITAL STOCK

    The  Company's authorized  capital stock  consists of  100,000,000 shares of
common stock, $.01  par value  (the "Common  Stock"), and  10,000,000 shares  of
preferred  stock, $.01  par value (the  "Preferred Stock"). As  of September 30,
1995, there were 19,502,914  shares of Common Stock  and no shares of  Preferred
Stock outstanding.

COMMON STOCK
    The  holders  of Common  Stock are  entitled to  one vote  per share  on all
matters to be voted upon by the stockholders. Subject to preferences  applicable
to  any outstanding Preferred Stock, the holders of Common Stock are entitled to
receive ratably such dividends as may be declared from time to time by the Board
of Directors  out  of funds  legally  available therefor  and  in the  event  of
liquidation,  dissolution, or winding  up of the Company,  the holders of Common
Stock  are  entitled  to  share  in  all  assets  remaining  after  payment   of
liabilities.  The Common Stock has no preemptive or conversion rights and is not
subject to further calls or assessments by the Company. There are no  redemption
or  sinking fund  provisions applicable  to the  Common Stock.  The Common Stock
currently outstanding is, and the Common  Stock offered hereby will be,  validly
issued, fully paid and non-assessable.

CERTAIN CHARTER PROVISIONS
    The Company's Restated Certificate of Incorporation, as amended, and Bylaws,
as  amended, contain certain procedural provisions that could have the effect of
delaying, deferring or  preventing a  change in  control of  the Company.  These
include  the following: (i) a provision  classifying the Board of Directors into
three classes;  and (ii)  a provision  requiring that  the affirmative  vote  of
two-thirds  (2/3)  of the  outstanding  voting shares  of  capital stock  of the
Company is required to approve certain business combinations.

PREFERRED STOCK
    The Board  of  Directors of  the  Company has  the  authority to  issue  the
Preferred  Stock in one  or more series  and to fix  the rights, preferences and
privileges, including dividend  rights, conversion  rights, liquidation  rights,
voting  rights,  and  the  number  of  shares  constituting  any  series  or the
designation of  such series  of Preferred  Stock, without  any further  vote  or
action  by the  stockholders. As of  the date  of this Prospectus,  there are no
outstanding shares of  Preferred Stock  or options to  purchase Preferred  Stock
other  than the  Rights Agreement  described below.  Although it  has no present
intention to  do  so,  the  Board  of Directors  of  the  Company  may,  without
stockholder  approval, issue Preferred  Stock with voting  and conversion rights
which could adversely affect  the voting power of  the holders of Common  Stock.
The  issuance of Preferred Stock may have  the effect of delaying, deferring, or
preventing a change of control of the Company.

RIGHTS AGREEMENT
    Effective September 1991, the Board of  Directors of the Company approved  a
Preferred  Shares Right Agreement  and declared a  dividend distribution payable
November 14, 1991 of one Preferred Share Purchase Right (the "Rights") for  each
share of its Common Stock outstanding on November 14, 1991 and each share of its
Common Stock issued thereafter (subject to certain limitations).

    Currently, the Rights trade with the shares of Common Stock. When the Rights
become exercisable, each Right will entitle the holder to buy one one-thousandth
of  a share  of Series A  Participating Preferred  Stock, $.01 par  value, at an
exercise price of $60 per one one-thousandth of a share. The Rights will  become
exercisable and will trade separately from the Common Stock (unless postponed by
action  of the disinterested directors of the  Company) on the earlier of (i) 10
days following a  public announcement that  a person or  group has acquired,  or
obtained  the  right to  acquire, beneficial  ownership  of 20%  or more  of the
Company's outstanding Common Stock or (ii) 10 days following the commencement or
announcement of a tender  offer or exchange offer  which, if consummated,  would
result  in the beneficial ownership by  a person or group of  20% or more of the
Company's outstanding Common Stock.

    In general, if any  person or group  acquires 20% or  more of the  Company's
Common  Stock without approval  of the Company's Board  of Directors, each Right
not held by the acquiring person will entitle its holder to purchase $120  worth
of  the Company's Common Stock for an effective purchase price of $60. If, after
any person or group acquires 20% or  more of the Company's Common Stock  without
the approval of

                                       23
<PAGE>
the  Board of Directors, the  Company is acquired in  a merger or other business
combination transaction,  each Right  not  held by  the acquiring  person  would
entitle  its holder to purchase $120 worth  of the Common Stock of the acquiring
company for $60. Under certain conditions,  the Company may elect to redeem  the
Rights  for $.01 per Right or  cause the exchange of each  Right not held by the
acquiring person for one share of the Company's Common Stock. Additionally,  the
exercise price, number of Rights, and number of shares of Series A Participating
Preferred  or  Common Stock  that may  be  acquired for  the exercise  price are
subject to adjustment from time to  time to prevent dilution. The Rights  expire
on  September 11,  2001, unless  previously exchanged  or redeemed  as described
above, or  terminated in  connection  with the  acquisition  of the  Company  by
consolidation  or  merger  approved by  the  Board of  Directors  and satisfying
certain conditions.

    The Rights are designed to protect and maximize the value of the outstanding
equity interests in the  Company in the  event of an  unsolicited attempt by  an
acquiror  to take over the Company  in a manner or on  terms not approved by the
Board of Directors.  Takeover attempts  frequently include  coercive tactics  to
deprive  a corporation's  Board of  Directors and  its stockholders  of any real
opportunity to determine the  destiny of the corporation.  The Rights have  been
declared  by the Board of Directors in  order to deter such tactics, including a
gradual accumulation of shares in the open  market of a 20% or greater  position
to  be followed by a merger or a  partial or two-tier tender offer that does not
treat all stockholders equally.

    The Rights are not intended  to prevent a takeover  of the Company and  will
not  do  so. Nevertheless,  the Rights  may  have the  effect of  rendering more
difficult or discouraging an  acquisition of the  Company deemed undesirable  by
the Board of Directors. The Rights may cause substantial dilution to a person or
group  that attempts to acquire the Company on terms or in a manner not approved
by the Company's  Board of Directors,  except pursuant to  an offer  conditioned
upon the negation, purchase or redemption of the Rights.

    The  description  above is  qualified in  its entirety  by reference  to the
Preferred Shares Right Agreement dated as of September 11, 1991.

DELAWARE TAKEOVER STATUTE
    The Company is  subject to  the provisions of  Section 203  of the  Delaware
General  Corporation Law,  which prohibits a  publicly-held Delaware corporation
from engaging in any "business combination" with an "interested stockholder" for
three years  following  the date  that  such stockholder  became  an  interested
stockholder,  unless  (i) prior  to such  date,  the board  of directors  of the
corporation approved either  the business  combination or  the transaction  that
resulted  in  the  stockholder  becoming an  interested  stockholder;  (ii) upon
consummation of the  transaction that  resulted in the  stockholder becoming  an
interested  stockholder, the  interested stockholder owned  at least  85% of the
voting stock  of  the  corporation  outstanding  at  the  time  the  transaction
commenced,   excluding  for  purposes  of   determining  the  number  of  shares
outstanding, those  shares owned  (a)  by persons  who  are directors  and  also
officers  and (b) by employee stock plans  in which employee participants do not
have the right to  determine confidentially whether shares  held subject to  the
plan  will be tendered in a tender or  exchange offer; or (iii) on or subsequent
to such date, the business combination is approved by the board of directors and
authorized at an annual or special  meeting of stockholders, and not by  written
consent,  by the affirmative vote of at  least 66 2/3% of the outstanding voting
stock not owned by the interested stockholder.

    Generally, a "business combination" includes a merger, asset or stock  sale,
or  other transaction resulting  in a financial benefit  to the stockholders. An
"interested  stockholder"  is  a  person  who,  together  with  affiliates   and
associates,  owns  (or within  three years  prior did  own) 15%  or more  of the
corporation's voting stock.

TRANSFER AGENT AND REGISTRAR
    The Transfer Agent and  Registrar for the Common  Stock is First  Interstate
Bank.

                                       24
<PAGE>
                CERTAIN UNITED STATES FEDERAL TAX CONSIDERATIONS
                      FOR NON-U.S. HOLDERS OF COMMON STOCK

    The following discussion concerns the material United States federal income,
gift  and estate tax consequences of the  ownership and disposition of shares of
Common Stock  applicable to  Non-U.S. Holders,  as defined,  of such  shares  of
Common  Stock. In general,  a "Non-U.S. Holder"  is any holder  other than (i) a
citizen or resident  of the  United States,  (ii) a  corporation or  partnership
created or organized in the United States or under the laws of the United States
or  any State or  (iii) an estate or  trust whose income  is includible in gross
income for United States federal income  tax purposes regardless of its  source.
The discussion is based on current law, which is subject to change retroactively
or  prospectively, and is for general  information only. The discussion does not
address all aspects of federal income  and estate taxation and does not  address
any  aspects  of state,  local  or foreign  tax  laws. The  discussion  does not
consider any specific  facts or  circumstances that  may apply  to a  particular
Non-U.S.  Holder (including the fact that in  the case of a Non-U.S. Holder that
is a partnership, the United States tax consequences of holding and disposing of
shares of Common  Stock may be  affected by certain  determinations made at  the
partner  level). Accordingly, prospective  investors are urged  to consult their
tax advisors  regarding the  United States  federal, state,  local and  non-U.S.
income  and other tax consequences of holding  and disposing of shares of Common
Stock.

DIVIDENDS
    Dividends, if  any  (see  "Dividend  Policy"), paid  to  a  Non-U.S.  Holder
generally  will be subject to United States withholding  tax at a 30% rate (or a
lower rate  as  may  be prescribed  by  an  applicable tax  treaty)  unless  the
dividends  are effectively  connected with a  trade or business  of the Non-U.S.
Holder within the  United States.  Dividends effectively connected  with such  a
trade  or business will generally not be subject to withholding (if the Non-U.S.
Holder properly files an executed IRS Form 4224 with the payor of the  dividend)
and  generally will  be subject  to United  States federal  income tax  on a net
income basis at regular graduated rates. In the case of a Non-U.S. Holder  which
is  a corporation, such effectively connected income  also may be subject to the
branch profits tax (which is generally  imposed on a foreign corporation on  the
repatriation  from  the  United  States of  effectively  connected  earnings and
profits). The branch profits tax may not  apply if the recipient is a  qualified
resident  of certain countries  with which the  United States has  an income tax
treaty. To determine  the applicability of  a tax treaty  providing for a  lower
rate  of withholding,  dividends paid  to an  address in  a foreign  country are
presumed, under the current Internal Revenue  Service position, to be paid to  a
resident  of that  country, unless  the payor  had definite  knowledge that such
presumption is  not warranted  or an  applicable tax  treaty (or  United  States
Treasury  Regulations thereunder) requires  some other method  for determining a
Non-U.S. Holder's resident.  The Company  must report annually  to the  Internal
Revenue Service and to each Non-U.S. Holder the amount of dividends paid to, and
the  tax  withheld  with  respect  to,  each  Non-U.S.  Holder.  These reporting
requirements apply regardless of whether  withholding was reduced or  eliminated
by  an applicable tax  treaty. Copies of  these information returns  also may be
made available under the provisions of a specific treaty or agreement to the tax
authorities in the country in which the Non-U.S. Holder resides.

SALE OF COMMON STOCK
    Generally, a Non-U.S. Holder  will not be subject  to United States  federal
income  tax on any gain realized upon the disposition of such holder's shares of
Common Stock  unless (i)  the gain  is  effectively connected  with a  trade  or
business  carried on by the  Non-U.S. Holder within the  United States (in which
case the  branch  profits  tax  may  apply); (ii)  the  Non-U.S.  Holder  is  an
individual  who  holds the  shares of  Common Stock  as a  capital asset  and is
present in the United  States for 183 days  or more in the  taxable year of  the
disposition  and to whom such  gain is United States  source; (iii) the Non-U.S.
Holder is subject to tax pursuant to  the provisions of U.S. tax law  applicable
to certain former United States citizens or residents; or (iv) the Company is or
has  been  a "U.S.  real property  holding corporation"  for federal  income tax
purposes (which the Company does not believe that it is or is likely to  become)
at  any time during the  five year period ending on  the date of disposition (or
such shorter  period  that  such  shares were  held)  and,  subject  to  certain
exceptions,  the Non-U.S. Holder  held, directly or indirectly,  more than 5% of
the Common Stock.

                                       25
<PAGE>
GIFT TAX
    Generally, an individual  who is  not a  citizen or  resident (as  specially
defined  for United States federal  estate and gift tax  purposes) of the United
States at the time of a gift will  not be subject to United States federal  gift
tax  on  the lifetime  transfer of  shares of  Common Stock  by gift  unless the
individual is  subject  to  tax pursuant  to  the  provisions of  U.S.  tax  law
applicable to certain former United States citizens.

ESTATE TAX
    Shares of Common Stock owned or treated as owned by an individual who is not
a citizen or resident (as specially defined for United States federal estate and
gift  tax purposes) of the United States at the time of death will be includible
in the individual's gross estate for United States federal estate tax  purposes,
unless an applicable tax treaty provides otherwise, and may be subject to United
States federal estate tax.

BACKUP WITHHOLDING AND INFORMATION REPORTING
    Under  current United States federal income  tax law, backup withholding tax
(which generally is  a withholding  tax imposed  at the  rate of  31 percent  on
certain  payments to persons that fail  to furnish certain required information)
and  information  reporting   apply  to  payments   of  dividends  (actual   and
constructive)  made to certain  non-corporate United States  persons. The United
States backup withholding tax requirements will generally not apply to dividends
paid on Common  Stock to  a Non-U.S.  Holder at  an address  outside the  United
States.

    The  payment of the proceeds from the  disposition of shares of Common Stock
through the United  States office  of a broker  will be  subject to  information
reporting  and backup withholding unless the holder, under penalties of perjury,
certifies, among other things,  its status as a  Non-U.S. Holder, or  otherwise,
establishes  an  exemption.  Generally, the  payment  of the  proceeds  from the
disposition of shares  of Common  Stock to  or through  a non-U.S.  office of  a
broker  will not  be subject to  backup withholding  and will not  be subject to
information reporting.  In  the  case  of  the  payment  of  proceeds  from  the
disposition of shares of Common Stock through a non-U.S. office of a broker that
is  a  U.S.  person  or  a "U.S.-related  person",  as  defined  below, existing
regulations require information  reporting (but not  backup withholding) on  the
payment  unless the  broker receives  a statement  from the  owner, signed under
penalties of perjury, certifying, among other  things, its status as a  Non-U.S.
Holder,  or the broker has documentary evidence in its files that the owner is a
Non-U.S. Holder and the broker has no actual knowledge to the contrary. For this
purpose, a "U.S.-related person" is  (i) a "controlled foreign corporation"  for
the  United States federal income  tax purposes or (ii)  a foreign person 50% or
more of whose gross  income from all  sources for the  three year period  ending
with  the close of its  taxable year preceding the payment  (or for such part of
the period that  the broker has  been in existence)  is derived from  activities
that  are effectively  connected with  the conduct of  a United  States trade or
business.

    Any amounts withheld from  a payment to a  Non-U.S. Holder under the  backup
withholding  rules  will be  allowed as  a credit  against such  holder's United
States federal income  tax liability and  may entitle such  holder to a  refund,
provided  that  the  required  information is  furnished  to  the  United States
Internal Revenue Service.  Non-U.S. Holders  should consult  their tax  advisors
regarding  the application  of these rules  to their  particular situations, the
availability of an exemption therefrom and  the procedure for obtaining such  an
exemption, if available.

                                       26
<PAGE>
                                  UNDERWRITERS

    Under  the  terms and  subject to  conditions  contained in  an Underwriting
Agreement dated the  date hereof, the  U.S. Underwriters named  below, for  whom
Morgan  Stanley  & Co.  Incorporated,  Donaldson, Lufkin  &  Jenrette Securities
Corporation, PaineWebber Incorporated and Needham & Company, Inc. are serving as
U.S. Representatives, have  severally agreed  to purchase, and  the Company  has
agreed  to  sell,  2,000,000  shares  of the  Company's  Common  Stock,  and the
International   Underwriters   named   below   (collectively   with   the   U.S.
Representatives,  the "Representatives"), have severally agreed to purchase, and
the Company has agreed  to sell, 500,000 shares  of the Company's Common  Stock,
which  in the aggregate equals the number  of shares set forth opposite the name
of such Underwriters below.

<TABLE>
<CAPTION>
                                                                       NUMBER
                               NAME                                  OF SHARES
- ------------------------------------------------------------------   ----------
<S>                                                                  <C>
U.S. Underwriters:
  Morgan Stanley & Co. Incorporated...............................
  Donaldson, Lufkin & Jenrette Securities Corporation.............
  PaineWebber Incorporated........................................
  Needham & Company, Inc..........................................

                                                                     ----------
        Subtotal..................................................    2,000,000

International Underwriters:
  Morgan Stanley & Co. International Limited......................
  Donaldson, Lufkin & Jenrette Securities Corporation.............
  PaineWebber International (U.K.) Ltd............................
  Needham & Company, Inc..........................................
                                                                     ----------
        Subtotal..................................................      500,000
                                                                     ----------
        Total.....................................................    2,500,000
                                                                     ----------
                                                                     ----------
</TABLE>

    The U.S. Underwriters  and the International  Underwriters are  collectively
referred  to as the "Underwriters." The Underwriting Agreement provides that the
obligations of the several  Underwriters to pay for  and accept delivery of  the
shares  of Common Stock  offered hereby are  subject to the  approval of certain
legal matters by counsel and to  certain other conditions. The Underwriters  are
obligated  to take and pay for all of  the shares of Common Stock offered hereby
(other than those covered by the  over-allotment option described below) if  any
are taken.

    Pursuant  to the Agreement Between U.S. and International Underwriters, each
U.S. Underwriter has represented  and agreed that,  with certain exceptions  set
forth below, (a) it is not purchasing any U.S. Shares (as defined below) for the
account  of anyone  other than  a United States  or Canadian  Person (as defined
below) and (b) it has not offered or sold, and will not offer or sell,  directly
or  indirectly, any U.S. Shares or distribute this Prospectus outside the United
States or Canada or  to anyone other  than a United  States or Canadian  Person.
Pursuant  to  the Agreement  between U.S.  and International  Underwriters, each
International  Underwriter  has  represented  and  agreed  that,  with   certain
exceptions  set forth below,  (a) it is not  purchasing any International Shares
(as defined below) for the account of  any United States or Canadian Person  and
(b)  it  has not  offered  or sold,  and  will not  offer  or sell,  directly or
indirectly, any International  Shares or distribute  this Prospectus within  the
United  States  or  Canada or  to  any  United States  or  Canadian  Person. The
foregoing limitations do not apply  to stabilization transactions or to  certain
other transactions

                                       27
<PAGE>
specified  in the  Agreement Between  U.S. and  International Underwriters. With
respect to  each of  Donaldson,  Lufkin &  Jenrette Securities  Corporation  and
Needham & Company, Inc., the foregoing representations or agreements (i) made by
it  in its capacity as  a U.S. Underwriter shall apply  only to shares of Common
Stock purchased by it in its capacity as a U.S. Underwriter, (ii) made by it  in
its  capacity  as an  International Underwriter  shall apply  only to  shares of
Common Stock purchased by it in its capacity as an International Underwriter and
(iii) shall  not restrict  its  ability to  distribute  this Prospectus  to  any
person. As used herein, "United States or Canadian Person" means any national or
resident   of  the  United  States  or   Canada  or  any  corporation,  pension,
profit-sharing or other trust  or other entity organized  under the laws of  the
United  States or Canada or  of any political subdivision  thereof (other than a
branch located outside of the United States  and Canada of any United States  or
Canadian  Person) and includes any United States  or Canadian branch of a person
who is not  otherwise a United  States or Canadian  Person, and "United  States"
means  the United  States of America,  its territories, its  possessions and all
areas subject to this jurisdiction. All shares of Common Stock to be offered  by
the  U.S.  Underwriters and  International  Underwriters under  the Underwriting
Agreement are referred  to herein as  the "U.S. Shares"  and the  "International
Shares," respectively.

    Pursuant to the Agreement Between U.S. and International Underwriters, sales
may  be made between the U.S. Underwriters and the International Underwriters of
any  number  of  shares  of  Common  Stock  to  be  purchased  pursuant  to  the
Underwriting  Agreement  as may  be  mutually agreed.  The  per share  price and
currency settlement of any shares  of Common Stock so  sold shall be the  public
offering  price set forth  on the cover  page hereof, in  United States dollars,
less an  amount not  greater than  the per  share amount  of the  concession  to
dealers set forth below.

    Pursuant  to the Agreement Between U.S. and International Underwriters, each
U.S. Underwriter has represented that it has not offered or sold, and has agreed
not to offer or  sell, any shares  of Common Stock,  directly or indirectly,  in
Canada  in contravention  of the  securities laws of  Canada or  any province or
territory thereof and has  represented that any offer  of such shares in  Canada
will  be  made only  pursuant to  an exemption  from the  requirement to  file a
prospectus in the province or territory of  Canada in which such offer is  made.
Each  U.S. Underwriter has  further agreed to  send to any  dealer who purchases
from it  any shares  of Common  Stock a  notice stating  in substance  that,  by
purchasing  such  shares, such  dealer  represents and  agrees  that it  has not
offered or sold, and will not offer or sell, directly or indirectly, any of such
shares in  Canada in  contravention of  the  securities laws  of Canada  or  any
province  or territory thereof and  that any offer of  shares of Common Stock in
Canada will be made only pursuant to an exemption from the requirement to file a
prospectus in the province or territory of  Canada in which such offer is  made,
and  that such dealer will deliver  to any other dealer to  whom it sells any of
such shares a notice to the foregoing effect.

    Pursuant to the Agreement Between U.S. and International Underwriters,  each
International  Underwriter has represented  that (i) it has  not offered or sold
and will not offer or sell any shares  of Common Stock to persons in the  United
Kingdom  except to persons whose ordinary  activities involve them in acquiring,
holding, managing or disposing  of investments (as principal  or agent) for  the
purposes  of  their  businesses  or otherwise  in  circumstances  which  are not
resulted and will not  result in an  offer to the public  in the United  Kingdom
within  the meaning  of the  Public Offers  of Securities  Regulations 1995 (the
"Regulations"); (ii)  it  has  complied  and will  comply  with  all  applicable
provisions  of  the Financial  Services  Act of  1986  and the  Regulations with
respect to anything done by it in relation to such shares in, from or  otherwise
involving the United Kingdom; and (iii) it has only issued or passed on and will
only  issue or pass on to any person in the United Kingdom any document received
by it in connection with the issue of  such shares, if that person is of a  kind
described  in Article  11(3) of the  Financial Services Act  of 1986 (Investment
Advertisements) (Exemptions) Order 1995,  or is a person  to whom such  document
may otherwise lawfully be issued or passed on.

    Pursuant  to the Agreement Between U.S. and International Underwriters, each
International Underwriter has represented and agreed that it has not offered  or
sold,  and will not offer or sell, directly or indirectly, in Japan or to or for
the account of  any resident  thereof, any shares  of Common  Stock acquired  in
connection   with  this  offering,  except  for  offers  or  sales  to  Japanese
International Underwriters or dealers and except pursuant to any exemption  from
the  registration requirements of the Securities and Exchange Law of Japan. Each
International Underwriter has further agreed to send to any dealer who purchases
from

                                       28
<PAGE>
it any of such shares  of Common Stock a notice  stating in substance that  such
dealer  may not  offer or sell  any of  such shares, directly  or indirectly, in
Japan or to or for the account  of any resident thereof, except pursuant to  any
exemption  from the registration requirements of the Securities and Exchange Law
of Japan, and that such  dealer will send to any  other dealer to whom it  sells
any of such shares a notice to the foregoing effect.

    The Underwriters propose to offer part of the shares of Common Stock offered
hereby  directly to  the public at  the public  offering price set  forth on the
cover page hereof  and part to  certain dealers  at a price  which represents  a
concession  not in excess of $       per  share under the public offering price.
The Underwriters may allow, and such  dealers may re-allow, a concession not  in
excess  of $       per share to other  Underwriters or to certain other dealers.
After the initial  offering of the  Common Stock, the  offering price and  other
selling terms may from time to time be varied by the Representatives.

    Pursuant  to the Underwriting Agreement, the Company has granted to the U.S.
Underwriters  an  option,  exercisable  for  30  days  from  the  date  of  this
Prospectus,  to purchase up to  an additional 375,000 shares  of Common Stock at
the public offering price set forth on the cover page hereof, less  underwriting
discounts  and commissions.  The U.S. Underwriters  may exercise  such option to
purchase solely for the purpose of covering over-allotments, if any, incurred in
the sale of the shares of Common Stock offered hereby. To the extent such option
is exercised, each U.S.  Underwriter will become  obligated, subject to  certain
conditions,  to purchase  approximately the  same percentage  of such additional
shares as the  number set  forth next  to such  U.S. Underwriters'  name in  the
preceding  table bears  to the  total number of  shares of  Common Stock offered
hereby to the U.S. Underwriters.

    The Company and the Underwriters have agreed to indemnify each other against
certain liabilities, including liabilities under the Securities Act of 1933,  as
amended (the "Securities Act").

    Each  of the executive officers and directors  of the Company has agreed not
to offer,  pledge,  sell, contract  to  sell, sell  any  option or  contract  to
purchase,  purchase any option or  contract to sell, grant  any option, right or
warrant  to  purchase,  or  otherwise  transfer  or  dispose  of,  directly   or
indirectly,  any shares of  Common Stock, or any  securities convertible into or
exercisable or exchangeable for Common Stock, or enter into any swap or  similar
agreement that transfers, in whole or in part, the economic risk of ownership of
the  Common Stock,  for a period  of 90 days  from the date  of this Prospectus,
without the prior written  consent of Morgan Stanley  & Co. Incorporated,  other
than  an  aggregate  of  100,000  shares  by  all  such  executive  officers and
directors,  which  shall  include  no  more  than  50,000  shares  by  any  such
individual.  The Company has  agreed in the Underwriting  Agreement that it will
not, directly or indirectly, without the prior written consent of Morgan Stanley
& Co. Incorporated, offer,  pledge, sell, contract to  sell, sell any option  or
contract to purchase, purchase any option or contract to sell, grant any option,
right  or warrant to purchase, or otherwise transfer or dispose of any shares of
Common Stock or any securities  convertible into or exercisable or  exchangeable
for  Common Stock, for  a period of 90  days after the  date of this Prospectus,
subject to certain limited exceptions.

    In connection with  this offering,  certain Underwriters  and selling  group
members  (if any)  or their respective  affiliates who  are qualified registered
market makers on The Nasdaq National Market, may engage in passive market making
transactions in the  Common Stock on  The Nasdaq National  Market in  accordance
with  Rule  10b-6A under  the Exchange  Act  during the  two-business-day period
before commencement of offers or sales  of the Common Stock. The passive  market
making  transactions must comply with applicable  volume and price limits and be
identified as such. In general, a passive market maker may display its bid at  a
price  not in  excess of the  highest independent  bid for the  security; if all
independent bids are lowered below the passive market maker's bid, however, such
bid must then  be lowered  when certain  purchase limits  are exceeded.  Passive
market  making may  stabilize the market  price of  the Common Stock  at a level
above that which might otherwise prevail and, if commenced, may be  discontinued
at any time.

                                       29
<PAGE>
                                 LEGAL MATTERS

    The  validity of the issuance  of the shares of  Common Stock offered hereby
will be  passed  upon for  the  Company by  Wilson  Sonsini Goodrich  &  Rosati,
Professional  Corporation, Palo Alto, California. Larry  W. Sonsini, a member of
such firm, is a  director of the  Company and holds  options to purchase  26,625
shares  of Common Stock. Certain legal  matters in connection with the offering,
will be passed  upon for  the Underwriters by  Morrison &  Foerster, Palo  Alto,
California.

                                    EXPERTS

    The  consolidated  financial  statements incorporated  by  reference  in the
Company's Annual Report on  Form 10-K for  the year ended  April 1, 1995,  which
Form  10-K  has been  incorporated by  reference in  this Prospectus,  have been
incorporated by reference in this Prospectus in reliance on the report of  Price
Waterhouse  LLP, independent accountants, given on the authority of said firm as
experts in accounting and auditing.

                             AVAILABLE INFORMATION

    The Company has filed with the  Commission a Registration Statement on  Form
S-3  (referred  to herein,  together with  all amendments  and exhibits,  as the
"Registration  Statement")  under  the  Securities  Act,  with  respect  to  the
securities  offered by this Prospectus. This  Prospectus does not contain all of
the information set forth in the Registration Statement, certain parts of  which
have  been  omitted  in  accordance  with  the  rules  and  regulations  of  the
Commission. For  further  information  with  respect  to  the  Company  and  the
securities  offered  hereby, reference  is made  to the  Registration Statement.
Statements made in this Prospectus as to  the contents of any contract or  other
document    referred   to    herein   are   not    necessarily   complete   and,
in each instance in which a copy of such contract is filed as an exhibit to  the
Registration  Statement, reference is made to  such copy and each such statement
shall be  deemed qualified  in all  respects by  such reference.  Copies of  the
Registration  Statement may be inspected, without  charge, at the offices of the
Commission, or obtained at prescribed rates from the Public Reference Section of
the Commission at the address set forth below.

    The Company is  subject to  the informational requirements  of the  Exchange
Act,  and  in accordance  therewith files  reports,  proxy statements  and other
information with  the  Commission.  Such reports,  proxy  statements  and  other
information  filed by  the Company  can be  inspected and  copied at  the public
reference facilities of the Commission located  at Room 1024, 450 Fifth  Street,
N.W.,  Judiciary Plaza, Washington, D.C. 20549  and at the Commission's regional
offices at Seven World Trade Center, 13th Floor, New York, New York 10048 and at
Northwestern Atrium  Center,  500  West Madison  Street,  Suite  1400,  Chicago,
Illinois  60661. Copies of  such material also  can be obtained  from the Public
Reference Section  of the  Commission  at Room  1024,  450 Fifth  Street,  N.W.,
Washington,  D.C.  20549, at  prescribed rates.  The  Company's Common  Stock is
quoted for trading on The Nasdaq  National Market and reports, proxy  statements
and  other information concerning the Company may be inspected at the offices of
the National  Association of  Securities Dealers,  Inc., 9513  Key West  Avenue,
Rockville, Maryland 20850.

                                       30
<PAGE>
                                     [LOGO]
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

<TABLE>
<CAPTION>
                                                                        TO BE
                                                                        PAID
                                                                       BY THE
                                                                      REGISTRANT
                                                                      ---------

<S>                                                                   <C>
Securities and Exchange Commission registration fee................   $  35,319
NASD filing fee....................................................      10,743
The Nasdaq National Market listing fee.............................      17,500
Accounting fees and expenses.......................................      45,000
Printing expenses..................................................      45,000
Transfer agent and registrar fees..................................       4,000
Blue Sky fees and expenses.........................................      12,000
Legal fees and expenses............................................     125,000
Miscellaneous expenses.............................................      55,438
                                                                      ---------
      Total........................................................   $ 350,000
                                                                      ---------
                                                                      ---------
</TABLE>

    All  of  the amounts  shown other  than the  SEC, NASD  and Nasdaq  fees are
estimated.

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

    The Company's Restated Certificate of Incorporation, as amended, limits  the
personal  liability of  directors for  monetary damages  for their  conduct as a
director. The  Company's Bylaws  provide that  the Company  shall indemnify  its
officers  and directors and may indemnify its  employees and other agents to the
fullest extent  permitted by  the Delaware  General Corporation  Law  ("Delaware
Law").

    Section  145 of the 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 Company's Restated Certificate of  Incorporation
have  no effect on the availability of  equitable remedies such as injunction or
rescission, based  upon a  director's breach  of the  duty of  care. Insofar  as
indemnification  for liabilities  arising under the  Securities Act  of 1933, as
amended (the  "Securities Act"),  may  be permitted  to directors,  officers  or
persons  controlling  the  Company  pursuant to  the  foregoing  provisions, the
Company has been  informed that in  the opinion of  the Securities and  Exchange
Commission  (the "Commission") such indemnification  is against public policy as
expressed in the Securities Act and is therefore unenforceable.

ITEM 16.  EXHIBITS

   
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                                                DESCRIPTION OF EXHIBIT
- ----------  --------------------------------------------------------------------------------------------------------------
<C>         <S>
      1.1*  Form of Underwriting Agreement
      5.1*  Opinion of  Wilson Sonsini  Goodrich &  Rosati, Professional  Corporation, counsel  to Registrant,  as to  the
              legality of the shares of common stock being registered
     23.1   Consent of Price Waterhouse LLP, independent public accountants
     23.2*  Consent of Wilson Sonsini Goodrich & Rosati, Professional Corporation (included in Exhibit 5.1)
     24.1*  Power of Attorney (see page II-3)
</TABLE>
    

- ---------
   
* Previously filed.
    

                                      II-1
<PAGE>
ITEM 17.  UNDERTAKINGS

    Insofar  as indemnification for liabilities arising under the Securities Act
of 1933,  as amended  (the "Securities  Act"), may  be permitted  to  directors,
officers and controlling persons of the Registrant pursuant to the Delaware Law,
the  Underwriting Agreement,  the Registrant's Certificate  of Incorporation and
Bylaws, or otherwise, the Registrant has been advised that in the opinion of the
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 hereunder, 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 of 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.

    The undersigned Registrant hereby undertakes that:

        (1)  For purposes of determining any liability under the Securities Act,
    the information omitted from  the form of Prospectus  filed as part of  this
    Registration Statement in reliance upon Rule 430A and contained in a form of
    Prospectus  filed by  the Registrant pursuant  to Rule 424(b)(1)  or (4), or
    497(h) under  the  Securities  Act  shall  be deemed  to  be  part  of  this
    Registration Statement as of the time it was declared effective.

        (2)  For the purpose  of determining any  liability under the Securities
    Act, each post-effective amendment that contains a form of prospectus  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)  For the purposes of determining  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.
    

                                      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 Amendment to the
Registration Statement to be signed on its behalf by the undersigned,  thereunto
duly  authorized,  in the  City of  Hillsboro, State  of Oregon,  on the  6th of
November, 1995.
    

                                          LATTICE SEMICONDUCTOR CORPORATION

                                          By:         /s/ RODNEY F. SLOSS

                                             -----------------------------------
                                                      Rodney F. Sloss,
                                                   VICE PRESIDENT, FINANCE

   
    Pursuant to the requirements of the  Securities Act of 1933, this  Amendment
to  the Registration Statement has been signed below by the following persons in
the capacities and on the dates indicated.
    

   
<TABLE>
<CAPTION>
                      SIGNATURE                                        TITLE                         DATE
- ------------------------------------------------------  -----------------------------------  --------------------

<C>                                                     <S>                                  <C>
                        */s/ CYRUS Y. TSUI              President, Chief Executive Officer
     -------------------------------------------          and Chairman of the Board            November 6, 1995
                    Cyrus Y. Tsui                         (Principal Executive Officer)

                      */s/ RODNEY F. SLOSS
     -------------------------------------------        Vice President, Finance (Principal     November 6, 1995
                   Rodney F. Sloss                        Financial and Accounting Officer)

                      */s/ DANIEL S. HAUER
     -------------------------------------------        Director                               November 6, 1995
                   Daniel S. Hauer

                       */s/ HARRY A. MERLO
     -------------------------------------------        Director                               November 6, 1995
                    Harry A. Merlo

                      */s/ LARRY W. SONSINI
     -------------------------------------------        Director                               November 6, 1995
                   Larry W. Sonsini

                     */s/ DOUGLAS C. STRAIN
     -------------------------------------------        Director                               November 6, 1995
                  Douglas C. Strain

          *By:          /s/ RODNEY F. SLOSS
                --------------------------------------
          Rodney F. Sloss, Attorney-in-Fact
</TABLE>
    

                                      II-3

<PAGE>
                                                                    EXHIBIT 23.1

                       CONSENT OF INDEPENDENT ACCOUNTANTS

    We  hereby  consent to  the incorporation  by  reference in  this Prospectus
constituting part of this Registration Statement on Form S-3 of our report dated
April 20,  1995  which  appears  on  page  24  of  the  1995  Annual  Report  to
Shareholders  of  Lattice Semiconductor  Corporation,  which is  incorporated by
reference in Lattice Semiconductor Corporation's Annual Report on Form 10-K  for
the  year ended April 1, 1995. We also consent to the incorporation by reference
of our report on the Financial Statement Schedules, which appears on page S-1 of
such Annual Report on Form 10-K. We  also consent to the references to us  under
the  headings  "Experts"  and  "Selected  Financial  Data"  in  such Prospectus.
However, it  should be  noted that  Price  Waterhouse LLP  has not  prepared  or
certified such "Selected Financial Data."

/s/ PRICE WATERHOUSE LLP
- ----------------------------
PRICE WATERHOUSE LLP

Portland, Oregon
November 3, 1995


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