LATTICE SEMICONDUCTOR CORP
S-3, 2000-07-11
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JULY 11, 2000

                                                      REGISTRATION NO. 333-
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

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

                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------

                       LATTICE SEMICONDUCTOR CORPORATION
             (Exact name of Registrant as specified in its Charter)

<TABLE>
<S>                             <C>                          <C>
           DELAWARE                                                93-0835214
 (State or other jurisdiction      5555 N.E. MOORE COURT        (I.R.S. Employer
              of                  HILLSBORO, OREGON 97124    Identification Number)
incorporation or organization)        (503) 268-8000
</TABLE>

  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)
                         ------------------------------

                                 CYRUS Y. TSUI
   PRESIDENT, CHIEF EXECUTIVE OFFICER AND CHAIRMAN OF THE BOARD OF DIRECTORS
                       LATTICE SEMICONDUCTOR CORPORATION
                             5555 N.E. MOORE COURT
                            HILLSBORO, OREGON 97124
                                 (503) 268-8000
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                         ------------------------------

                                    COPY TO:

<TABLE>
<S>                                    <C>
            JOHN A. FORE                          BRUCE K. DALLAS
  WILSON SONSINI GOODRICH & ROSATI,            DAVIS POLK & WARDWELL
      PROFESSIONAL CORPORATION                  1600 EL CAMINO REAL
         650 PAGE MILL ROAD                MENLO PARK, CALIFORNIA 94025
     PALO ALTO, CALIFORNIA 94304                  (650) 752-2000
           (650) 493-9300
</TABLE>

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

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
possible after this Registration Statement becomes effective.

    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, 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, please 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. / /
                         ------------------------------

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
                                                              PROPOSED MAXIMUM     PROPOSED MAXIMUM
  TITLE OF EACH CLASS OF SECURITIES        AMOUNT TO BE      OFFERING PRICE PER   AGGREGATE OFFERING        AMOUNT OF
           TO BE REGISTERED                REGISTERED(1)         SECURITY(2)          PRICE(1)(2)      REGISTRATION FEE(2)
<S>                                     <C>                  <C>                  <C>                  <C>
Common stock, $0.01 par value.........       4,600,000             $64.79            $298,034,000            $78,681
</TABLE>

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

(1) Includes 600,000 shares of common stock issuable upon exercise of the
    underwriters' option to purchase additional shares in this offering.

(2) Estimated solely for the purpose of determining the registration fee
    pursuant to Rule 457(c) promulgated under the Securities Act of 1933 and
    based on the average of the high and low prices of the common stock as
    quoted on the Nasdaq National Market on July 6, 2000.
                         ------------------------------

    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 THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
<PAGE>
                  SUBJECT TO COMPLETION. DATED JULY 11, 2000.

THE INFORMATION IN THIS PRELIMINARY PROSPECTUS IS NOT COMPLETE AND MAY BE
CHANGED. THESE SECURITIES MAY NOT BE SOLD UNTIL THE REGISTRATION STATEMENT FILED
WITH THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PRELIMINARY
PROSPECTUS IS NOT AN OFFER TO SELL NOR DOES IT SEEK AN OFFER TO BUY THESE
SECURITIES IN ANY JURISDICTION WHERE THE OFFER OR SALE IS NOT PERMITTED.
<PAGE>
                                4,000,000 Shares

                                     [LOGO]

                                  Common Stock

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

    The common stock is quoted on the Nasdaq National Market under the symbol
LSCC. The last reported sale price of the common stock on July 10, 2000 was
$             per share.

    SEE "RISK FACTORS" BEGINNING ON PAGE 7 TO READ ABOUT FACTORS YOU SHOULD
CONSIDER BEFORE BUYING SHARES OF OUR COMMON STOCK.

    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

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

<TABLE>
<CAPTION>
                                                              Per Share    Total
                                                              ---------   --------
<S>                                                           <C>         <C>
Initial price to public.....................................      $          $
Underwriting discount.......................................      $          $
Proceeds, before expenses, to Lattice.......................      $          $
</TABLE>

    If the underwriters sell more than 4,000,000 shares of common stock, the
underwriters have the option to purchase up to an additional 600,000 shares from
Lattice at the public offering price less the underwriting discount.

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

    The underwriters expect to deliver the shares to purchasers in New York, New
York on July   , 2000.

                           JOINT BOOKRUNNING MANAGERS

GOLDMAN, SACHS & CO.                                  MORGAN STANLEY DEAN WITTER

                          PRUDENTIAL VOLPE TECHNOLOGY
                        a unit of Prudential Securities

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

                        Prospectus dated July   , 2000.
<PAGE>
                               PROSPECTUS SUMMARY

    THIS SUMMARY HIGHLIGHTS INFORMATION WE PRESENT MORE FULLY ELSEWHERE IN THIS
PROSPECTUS AND IN THE DOCUMENTS INCORPORATED BY REFERENCE INTO THIS PROSPECTUS.
THIS SUMMARY DOES NOT CONTAIN ALL OF THE INFORMATION THAT YOU SHOULD CONSIDER
BEFORE BUYING SHARES IN THE OFFERING. YOU SHOULD READ CAREFULLY THE ENTIRE
PROSPECTUS AND ALL OF THE DOCUMENTS INCORPORATED BY REFERENCE INTO THIS
PROSPECTUS.

                       LATTICE SEMICONDUCTOR CORPORATION

    We design, develop and market high performance programmable logic devices
and related software. We are the world's leading supplier of in-system
programmable logic devices. Programmable logic devices are widely-used
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. Our end customers are primarily original equipment
manufacturers, in the markets of data communications and telecommunications, as
well as computing, industrial and military systems. During the March 2000
quarter, we derived approximately 65% of our $126 million in revenue from the
communications markets and approximately 21% from the computing market.

    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
which generally entail significant design risks and time delay. Standard logic
products, an alternative to custom-designed application specific integrated
circuits, limit a manufacturer's flexibility to customize an end system.
Programmable logic devices give system designers the ability to quickly create
own custom logic circuits, provide product differentiation and rapidly bring
products to market.

    According to Dataquest, the programmable logic device market in 1999 was
approximately $2.5 billion. The programmable logic device market has two primary
segments: high-density programmable logic devices, with more than 1,000 logic
gates, and low-density programmable logic devices, with fewer than 1,000 logic
gates. High-density programmable logic devices include devices based on both the
complex programmable logic device and the field programmable gate array
architectures. In 1999, Dataquest estimated that the complex programmable logic
device market was $0.9 billion and the field programmable gate array market was
$1.4 billion.

    We offer a full product line in both the high-density complex programmable
logic device market and the low-density programmable logic device market. Our
strategy has been to continue to increase our market share in the rapidly
growing complex programmable logic device market with differentiated proprietary
products, software and technology and at present we hold the number two position
in this market. Since we introduced our first complex programmable logic device
products in 1992, we have continued to focus on increasing the percentage of our
total revenue generated by complex programmable logic device products. During
the March 2000 quarter, complex programmable logic device revenue accounted for
approximately 72% of our total revenue.

    Our complex programmable logic device products provide our customers with
industry-leading performance, density and number of input/output pins. In
addition, we currently offer 29 complex programmable logic device products that
operate using a 3.3-volt or 2.5-volt power supply instead of the older 5-volt
standard, the largest portfolio of low-voltage complex programmable logic device
products in the marketplace. Lower voltage programmable logic devices benefit
end users by consuming less power and providing compatibility with other
advanced electronic components. We believe that our innovative low-voltage
complex programmable logic device products provide us a competitive advantage as
our customers transition the power supply of their systems from 5 volts to 3.3
volts.

    We pioneered the development of in-system programmability, which has become
an industry standard feature in the programmable logic device market. In
contrast to standard programmable logic

                                       3
<PAGE>
device programming technologies, in-system programmability allows the system
designer to configure and reconfigure a programmable logic device without
removing the device from the system board. By enhancing the flexibility of
programmable logic devices, in-system programmability provides a number of
important benefits to a system manufacturer over the lifecycle of an electronic
system product. In-system programmability 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.

    In June 1999, we acquired Vantis Corporation, the programmable logic device
subsidiary of Advanced Micro Devices. This acquisition has increased our share
of the programmable logic device market, accelerated development of new products
and technologies and expanded our penetration into new and existing customers.

    Our manufacturing strategy has been to procure silicon wafers for our
products from leading manufacturers under current purchase orders and long-term
agreements. This has allowed us to avoid the cost of establishing our own wafer
fabrication facility.

    We sell our products directly to end customers through a network of
independent sales representatives and indirectly through a network of
distributors. We use a direct sales management and field applications
engineering organization together with manufacturers' representatives and
distributors to reach a broad base of potential end customers. We believe our
distribution channels provide a cost-effective means for reaching end customers.

    We were incorporated in Oregon in 1983 and reincorporated in Delaware in
1985. Our principal offices are located at 5555 N.E. Moore Court, Hillsboro,
Oregon 97124, our telephone number is (503) 268-8000 and our website can be
accessed at www.latticesemi.com. Information contained in our website is not
intended to constitute part of this prospectus.

                                       4
<PAGE>
                                  THE OFFERING

<TABLE>
<S>                                                    <C>
Shares offered.......................................  4,000,000 shares.
Shares to be outstanding after this offering.........  53,446,405 shares.
Nasdaq National Market symbol........................  LSCC
Use of proceeds......................................  General corporate purposes, including working
                                                       capital, and potentially for investments to
                                                       maintain and expand our wafer supply capacity
                                                       and for acquisition opportunities that may
                                                       arise in the future.
</TABLE>

    The number of shares to be outstanding after this offering includes:

    - 49,446,405 shares of common stock outstanding at June 30, 2000; and

    - 4,000,000 shares of common stock offered in this offering.

    The number of shares to be outstanding after this offering excludes:

    - 7,404,748 shares of common stock issuable upon exercise of stock options
      outstanding at June 30, 2000, with a weighted average exercise price of
      $23.83 per share;

    - 3,372,549 shares of common stock available for grant at June 30, 2000
      under our 1996 stock option plan;

    - 126,000 shares of common stock available for grant at June 30, 2000 under
      our 1993 directors' stock option plan;

    - 319,096 shares of common stock available for issuance at June 30, 2000
      under our employee stock purchase plan;

    - 313,396 shares of common stock issuable upon exercise of warrants
      outstanding at June 30, 2000, at a weighted average exercise price of
      $24.10 per share; and

    - 6,274,131 shares of common stock issuable upon conversion of our 4 3/4%
      convertible subordinated notes.

Except as otherwise indicated, information in this prospectus assumes no
exercise of the underwriters' option to purchase additional shares in the
offering.

                                       5
<PAGE>
                      SUMMARY CONSOLIDATED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                       NINE MONTH       THREE MONTHS ENDED MARCH 31,
                                                   YEAR ENDED         FISCAL PERIOD   ---------------------------------
                                                    MARCH 31,             ENDED
                                              ---------------------     DEC. 31,                 PRO FORMA
                                                1998        1999         1999(1)        1999      1999(2)       2000
                                              ---------   ---------   -------------   --------   ----------   ---------
                                                                                                 (UNAUDITED)
<S>                                           <C>         <C>         <C>             <C>        <C>          <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenue.....................................  $245,894    $200,072      $269,699      $53,788     $100,945    $126,055
Gross profit................................   147,011     121,632       161,012       33,045       59,807      76,470
Income (loss) from operations...............    75,065      51,624       (70,350)      14,692          400      18,351
Net income (loss)...........................    56,567      42,046       (48,146)(3)   11,848       (1,722)    104,821(4)
                                              ========    ========      ========      =======     ========    ========
Basic net income (loss) per share...........  $   1.22    $    .90      $  (1.01)     $   .25     $   (.04)   $   2.15
                                              ========    ========      ========      =======     ========    ========
Diluted net income (loss) per share.........  $   1.18    $    .88      $  (1.01)     $   .24     $   (.04)   $   1.84
                                              ========    ========      ========      =======     ========    ========
Shares used in per share calculations:
  Basic.....................................    46,478      46,974        47,714       47,076       47,076      48,738
                                              ========    ========      ========      =======     ========    ========
  Diluted...................................    47,788      47,638        47,714       48,398       47,076      58,409
                                              ========    ========      ========      =======     ========    ========
</TABLE>

<TABLE>
<CAPTION>
                                                                    MARCH 31, 2000
                                                                ACTUAL     AS ADJUSTED(5)
                                                              ----------   --------------
                                                                      (UNAUDITED)
<S>                                                           <C>          <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash, cash equivalents and short-term investments...........  $  237,804     $
Working capital.............................................     209,018
Total assets................................................   1,078,608
Long-term debt..............................................     260,000
Stockholders' equity........................................     619,340
</TABLE>

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

(1) In 1999, we changed our fiscal year end from March 31 to December 31. This
    period includes financial results for our acquisition of Vantis since
    June 15, 1999. The pro forma results of operations for the period ended
    December 31, 1999 have been reflected in the Form 8-K filed July 11, 2000,
    which is incorporated by reference in this prospectus.

(2) Reflects our acquisition of Vantis Corporation. The pro forma unaudited
    statement of operations data for the three months ended March 31, 1999 are
    presented using our unaudited condensed consolidated statement of operations
    for the three months ended March 31, 1999 combined with Vantis' unaudited
    condensed consolidated statement of operations for the three months ended
    March 28, 1999 assuming the transaction occurred on the first day of that
    period.

(3) Includes the effects of an $89.0 million charge for in-process research and
    development and the related income tax effects incurred and recorded in
    conjunction with our acquisition of Vantis on June 15, 1999, and an
    extraordinary loss of $1.7 million, net of income taxes, for unamortized
    debt issuance costs related to bank debt retired with the proceeds from our
    issuance of 4 3/4% convertible subordinated notes during the period. See
    Notes 4 and 8 to the consolidated financial statements for the period ended
    December 31, 1999 incorporated by reference in this prospectus.

(4) Includes the effects of a $150 million gain ($92.1 million after-tax)
    representing the appreciation of investments made in two Taiwanese
    semiconductor foundry companies. See Note 10 to the unaudited consolidated
    financial statements for the period ended March 31, 2000 incorporated by
    reference in this prospectus.

(5) The as adjusted column gives effect to the sale of 4,000,000 shares of
    common stock at an assumed offering price to the public of $     per share
    and after deducting an assumed underwriting discount and estimated offering
    expenses payable by us and assuming that the underwriters' option to
    purchase additional shares in the offering is not exercised.

                                       6
<PAGE>
                                  RISK FACTORS

    YOU SHOULD CAREFULLY CONSIDER THE RISKS DESCRIBED BELOW BEFORE MAKING AN
INVESTMENT DECISION. IF ANY OF THE FOLLOWING RISKS ACTUALLY OCCURS, OUR
BUSINESS, FINANCIAL CONDITION AND RESULTS OF OPERATIONS COULD BE HARMED. THIS
COULD CAUSE THE TRADING PRICE OF OUR COMMON STOCK TO DECLINE, AND YOU MAY LOSE
ALL OR PART OF YOUR INVESTMENT.

                         RISKS RELATED TO OUR BUSINESS

OUR WAFER SUPPLY MAY BE INTERRUPTED OR REDUCED, WHICH MAY RESULT IN A SHORTAGE
OF FINISHED PRODUCTS AVAILABLE FOR SALE.

    We do not manufacture finished silicon wafers. Currently, all of our silicon
wafers are manufactured by Seiko Epson in Japan, AMD in the United States and
UMC in Taiwan. If Seiko Epson, through its U.S. affiliate Epson Electronics
America, AMD or UMC significantly interrupts or reduces our wafer supply, our
operating results could be harmed.

    In the past, we have experienced delays in obtaining wafers and in securing
supply commitments from our foundries. At present, we anticipate that our supply
commitments are adequate. However, these existing supply commitments may not be
sufficient for us to satisfy customer demand in future periods. Additionally,
notwithstanding our supply commitments we may still have difficulty in obtaining
wafer deliveries consistent with the supply commitments. We negotiate wafer
prices and supply commitments from our suppliers on at least an annual basis. If
any of Seiko Epson, Epson Electronics America, AMD or UMC were to reduce its
supply commitment or increases its wafer prices, and we cannot find alternative
sources of wafer supply, our operating results could be harmed.

    Many other factors that could disrupt our wafer supply are beyond our
control. Since worldwide manufacturing capacity for silicon wafers is limited
and inelastic, we could be harmed by significant industry-wide increases in
overall wafer demand or interruptions in wafer supply. Additionally, a future
disruption of Seiko Epson's, AMD's or UMC's foundry operations as a result of a
fire, earthquake or other natural disaster could disrupt our wafer supply and
could harm our operating results.

IF OUR FOUNDRY PARTNERS EXPERIENCE QUALITY OR YIELD PROBLEMS, WE MAY FACE A
SHORTAGE OF FINISHED PRODUCTS AVAILABLE FOR SALE.

    We depend on our foundries to deliver reliable silicon wafers with
acceptable yields in a timely manner. As is common in our industry, we have
experienced wafer yield problems and delivery delays. If our foundries are
unable to produce silicon wafers that meet our specifications, with acceptable
yields, for a prolonged period, our operating results could be harmed.

    Substantially all of our revenue is derived from products based on a
specialized silicon wafer manufacturing process technology called
E(2)CMOS-Registered Trademark-. The reliable manufacture of high performance
E(2)CMOS semiconductor wafers is a complicated and technically demanding process
requiring:

    - a high degree of technical skill;

    - state-of-the-art equipment;

    - the absence of defects in the masks used to print circuits on a wafer;

    - the elimination of minute impurities and errors in each step of the
      fabrication process; and

    - effective cooperation between the wafer supplier and the circuit designer.

    As a result, our foundries may experience difficulties in achieving
acceptable quality and yield levels when manufacturing our silicon wafers.

                                       7
<PAGE>
WE MAY BE UNSUCCESSFUL IN DEFINING, DEVELOPING OR SELLING NEW PRODUCTS REQUIRED
TO MAINTAIN OR EXPAND OUR BUSINESS.

    As a semiconductor company, we operate in a dynamic environment marked by
rapid product obsolescence. Our future success depends on our ability to
introduce new or improved products that meet customer needs while achieving
acceptable margins. If we fail to introduce these new products in a timely
manner or these products fail to achieve market acceptance, our operating
results would be harmed.

    The introduction of new products in a dynamic market environment presents
significant business challenges. Product development commitments and
expenditures must be made well in advance of product sales. The success of a new
product depends on accurate forecasts of long-term market demand and future
technology developments.

    Our future revenue growth is dependent on market acceptance of our new
product families and the continued market acceptance of our software development
tools. The success of these products is dependent on a variety of specific
technical factors including:

    - successful product definition;

    - timely and efficient completion of product design;

    - timely and efficient implementation of wafer manufacturing and assembly
      processes;

    - product performance; and

    - the quality and reliability of the product.

    If, due to these or other factors, our new products do not achieve market
acceptance, our operating results would be harmed.

OUR PRODUCTS MAY NOT BE COMPETITIVE IF WE ARE UNSUCCESSFUL IN MIGRATING OUR
MANUFACTURING PROCESSES TO MORE ADVANCED TECHNOLOGIES.

    To develop new products and maintain the competitiveness of existing
products, we need to migrate to more advanced wafer manufacturing processes that
use larger wafer sizes and smaller device geometries. We also may need to use
additional foundries. Because we depend upon foundries to provide their
facilities and support for our process technology development, we may experience
delays in the availability of advanced wafer manufacturing process technologies
at existing or new wafer fabrication facilities. As a result, volume production
of our advanced E(2)CMOS process technologies at the new fabs of Seiko Epson,
UMC or future foundries may not be achieved. This could harm our operating
results.

IF OUR ASSEMBLY AND TEST SUBCONTRACTORS EXPERIENCE QUALITY OR YIELD PROBLEMS, WE
MAY FACE A SHORTAGE OF FINISHED PRODUCTS AVAILABLE FOR SALE.

    We rely on subcontractors to assemble and test our devices with acceptable
quality and yield levels. As is common in our industry, we have experienced
quality and yield problems in the past. If we experience prolonged quality or
yield problems in the future, our operating results could be harmed.

    The majority of our revenue is derived from semiconductor devices assembled
in advanced packages. The assembly of advanced packages is a complex process
requiring:

    - a high degree of technical skill;

    - state-of-the-art equipment;

    - the absence of defects in lead frames used to attach semiconductor devices
      to the package;

    - the elimination of raw material impurities and errors in each step of the
      process; and

                                       8
<PAGE>
    - effective cooperation between the assembly subcontractor and the device
      manufacturer.

    As a result, our subcontractors may experience difficulties in achieving
acceptable quality and yield levels when assembling and testing our
semiconductor devices.

DETERIORATION OF CONDITIONS IN ASIA MAY DISRUPT OUR EXISTING SUPPLY ARRANGEMENTS
AND RESULT IN A SHORTAGE OF FINISHED PRODUCTS AVAILABLE FOR SALE.

    Two of our three silicon wafer suppliers operate fabs located in Asia. Our
finished silicon wafers are assembled and tested by independent subcontractors
located in Hong Kong, Malaysia, the Philippines, South Korea, Taiwan and
Thailand. A prolonged interruption in our supply from any of these
subcontractors could harm our operating results.

    Economic, financial, social and political conditions in Asia have been
volatile. Financial difficulties, governmental actions or restrictions,
prolonged work stoppages or any other difficulties experienced by our suppliers
may disrupt our supply and could harm our operating results.

    Our wafer purchases from Seiko Epson are denominated in Japanese yen. The
value of the dollar with respect to the yen fluctuates. Substantial
deterioration of dollar-yen exchange rates could harm our operating results.

EXPORT SALES ACCOUNT FOR A SUBSTANTIAL PORTION OF OUR REVENUES AND MAY DECLINE
IN THE FUTURE DUE TO ECONOMIC AND GOVERNMENTAL UNCERTAINTIES.

    Our export sales are affected by unique risks frequently associated with
foreign economies including:

    - changes in local economic conditions;

    - exchange rate volatility;

    - governmental controls and trade restrictions;

    - export license requirements and restrictions on the export of technology;

    - political instability;

    - changes in tax rates, tariffs or freight rates;

    - interruptions in air transportation; and

    - difficulties in staffing and managing foreign sales offices.

    For example, our export sales have been affected by regional economic
crises. Significant changes in the economic climate in the foreign countries
where we derive our export sales could harm our operating results.

OUR FUTURE QUARTERLY OPERATING RESULTS MAY FLUCTUATE AND THEREFORE MAY FAIL TO
MEET EXPECTATIONS.

    Our quarterly operating results have fluctuated and may continue to
fluctuate. Consequently, our operating results may fail to meet the expectations
of analysts and investors. As a result of industry conditions and the following
specific factors, our quarterly operating results are more likely to fluctuate
and are more difficult to predict than a typical non-technology company of our
size and maturity:

    - general economic conditions in the countries where we sell our products;

    - the timing of our and our competitors' new product introductions;

    - product obsolescence;

    - the scheduling, rescheduling and cancellation of large orders by our
      customers;

                                       9
<PAGE>
    - the cyclical nature of demand for our customers' products;

    - our ability to develop new process technologies and achieve volume
      production at the new fabs of Seiko Epson, UMC or at other foundries;

    - changes in manufacturing yields;

    - adverse movements in exchange rates, interest rates or tax rates; and

    - the availability of adequate supply commitments from our wafer foundries
      and assembly and test subcontractors.

    As a result of these factors, our past financial results are not necessarily
a good predictor of our future results.

OUR STOCK PRICE MAY CONTINUE TO EXPERIENCE LARGE SHORT-TERM FLUCTUATIONS.

    In recent years, the price of our common stock has fluctuated greatly. These
price fluctuations have been rapid and severe and have left investors little
time to react. The price of our common stock may continue to fluctuate greatly
in the future due to a variety of company specific factors, including:

    - quarter-to-quarter variations in our operating results;

    - shortfalls in revenue or earnings from levels expected by securities
      analysts; and

    - announcements of technological innovations or new products by other
      companies.

                         RISKS RELATED TO OUR INDUSTRY

THE CYCLICAL NATURE OF THE SEMICONDUCTOR INDUSTRY MAY LIMIT OUR ABILITY TO
MAINTAIN OR INCREASE REVENUE AND PROFIT LEVELS DURING FUTURE INDUSTRY DOWNTURNS.

    The semiconductor industry is cyclical. Our financial performance has been
negatively affected by significant downturns in the semiconductor industry as a
result of:

    - the cyclical nature of the demand for the products of semiconductor
      customers;

    - general reductions in inventory levels by customers;

    - excess production capacity; and

    - accelerated declines in average selling prices.

    If these or other conditions in the semiconductor industry occur, our
operating results could be harmed.

WE MAY NOT BE ABLE TO SUCCESSFULLY COMPETE IN THE HIGHLY COMPETITIVE
SEMICONDUCTOR INDUSTRY.

    The semiconductor industry is intensely competitive and many of our direct
and indirect competitors have substantially greater financial, technological,
manufacturing, marketing and sales resources. If we are unable to compete
successfully in this environment, our operating results could be harmed.

    The current level of competition in the programmable logic market is high
and may increase as our market expands. We currently compete directly with
companies that have licensed our products and technology or have developed
similar products. We also compete indirectly with numerous semiconductor
companies that offer products and solutions based on alternative technologies.
These direct and indirect competitors are established multinational
semiconductor companies as well as emerging companies. We also may experience
significant competition from foreign companies in the future.

                                       10
<PAGE>
WE MAY FAIL TO RETAIN OR ATTRACT THE SPECIALIZED TECHNICAL AND MANAGEMENT
PERSONNEL REQUIRED TO SUCCESSFULLY OPERATE OUR BUSINESS.

    To a greater degree than most non-technology companies or larger technology
companies, our future success depends on our ability to attract and retain
highly qualified technical and management personnel. As a mid-sized company, we
are particularly dependent on a relatively small group of key employees.
Competition for skilled technical and management employees is intense within our
industry. As a result, we may be unable to retain our existing key technical and
management personnel or attract additional qualified employees. If we are unable
to retain existing key employees or hire new qualified employees, our operating
results could be harmed.

IF WE ARE UNABLE TO ADEQUATELY PROTECT OUR INTELLECTUAL PROPERTY RIGHTS, OUR
FINANCIAL RESULTS AND COMPETITIVE POSITION MAY SUFFER.

    Our success depends, in part, on our proprietary technology. However, we may
fail to adequately protect this technology. As a result, we may lose our
competitive position or face significant expense to protect or enforce our
intellectual property rights.

    We intend to continue to protect our proprietary technology through patents,
copyrights and trade secrets. Despite this intention, we may not be successful
in achieving adequate protection. Claims allowed on any of our patents may not
be sufficiently broad to protect our technology. Patents issued to us also may
be challenged, invalidated or circumvented. Finally, our competitors may develop
similar technology independently.

    Companies in the semiconductor industry vigorously pursue their intellectual
property rights. If we become involved in protracted intellectual property
disputes or litigation we may use substantial financial and management
resources, which could harm our operating results.

    We may also be subject to future intellectual property claims or judgements.
If these were to occur, we may not be able to obtain a license on favorable
terms or without our operating results being harmed.

                                       11
<PAGE>
               YOU SHOULD NOT RELY ON FORWARD-LOOKING STATEMENTS
                     BECAUSE THEY ARE INHERENTLY UNCERTAIN

    This prospectus, including the documents that we incorporate by reference,
contains forward-looking statements within the meaning of Section 27A of the
Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934.
Any statements about our expectations, beliefs, plans, objectives, assumptions
or future events or performance are not historical facts and may be
forward-looking. We use words or phrases such as "anticipate," "estimate,"
"plans," "projects," "continuing," "ongoing," "expects," "management believes,"
"we believe," "we intend" and similar words or phrases to identify
forward-looking statements.

    Forward-looking statements involve estimates, assumptions and uncertainties
that could cause actual results to differ materially from those expressed in
them. Any forward-looking statements are qualified in their entirety by
reference to the factors discussed throughout this prospectus. Among the key
factors that could cause actual results to differ materially from the
forward-looking statements:

    - delay in product or technology development;

    - change in economic conditions of the various markets we serve;

    - lack of market acceptance or demand for our new products;

    - dependencies on silicon wafer suppliers and semiconductor assemblers;

    - the impact of competitive products and pricing;

    - opportunities or acquisitions that we pursue; and

    - the availability and terms of financing.

    You should not unduly rely on forward-looking statements because our actual
results could materially differ from those expressed in any forward-looking
statements made by us. Further, any forward-looking statement applies only as of
the date on which it is made. We are not required to update any forward-looking
statement or statements to reflect events or circumstances after the date on
which such statement is made or to reflect the occurrence of unanticipated
events.

                                       12
<PAGE>
                                USE OF PROCEEDS

    The net proceeds we will receive from our sale of the 4,000,000 shares of
common stock in this offering are estimated to be $      million, or $
million if the underwriters exercise in full their option to purchase additional
shares in the offering. These estimates are calculated based on an assumed
public offering price of $      per share and after deducting an assumed
underwriting discount and estimated offering expenses payable by us.

    We intend to use the net proceeds for general corporate purposes, including
working capital, and potentially for investments in order to maintain and expand
our wafer supply capacity.

    We may, when and if the opportunity arises, use a portion of the net
proceeds to acquire complementary products, technologies or businesses. Until we
use the net proceeds of this offering, we intend to invest the net proceeds in
interest-bearing, investment-grade securities.

                            COMMON STOCK PRICE RANGE

    Our common stock is quoted on the Nasdaq National Market under the symbol
LSCC. The following table sets forth the low and high last reported sale prices
for our common stock for the last two fiscal years and for the period since
January 1, 2000. On July 10, 2000, the last reported sale price of our common
stock was $      . As of July   , 2000, we had approximately   stockholders of
record.

<TABLE>
<CAPTION>
                                                                 LOW        HIGH
                                                              ---------   ---------
<S>                                                           <C>         <C>
Fiscal year ended March 31, 1999
  First quarter.............................................  $13.438     $26.563
  Second quarter............................................   11.875      18.313
  Third quarter.............................................    9.562      22.953
  Fourth quarter............................................   19.125      27.500
Fiscal period ended December 31, 1999
  First quarter.............................................  $19.812     $31.125
  Second quarter............................................   26.938      34.500
  Third quarter.............................................   28.125      53.750
Fiscal year ending December 31, 2000
  First quarter.............................................  $41.625     $79.062
  Second quarter............................................   51.500      82.688
  Third quarter (through July 10, 2000).....................   63.250      72.500
</TABLE>

    All share amounts have been adjusted retroactively to reflect the
two-for-one stock split effected in the form of a stock dividend of one share of
common stock for each share of our outstanding common stock that was paid on
September 16, 1999.

                                DIVIDEND POLICY

    The payment of dividends on our common stock is within the discretion of our
board of directors. Currently, we intend to retain earnings to finance the
growth of our business. We have not paid cash dividends on our common stock, and
the board of directors does not expect to declare cash dividends on the common
stock in the near future.

                                       13
<PAGE>
                                 CAPITALIZATION

    The following table sets forth our capitalization as of March 31, 2000 on an
actual basis and as adjusted to give effect to the sale of the 4,000,000 shares
of common stock, at an assumed offering price to the public of $   per share and
after deducting an assumed underwriting discount and estimated offering expenses
payable by us and assuming the underwriters' option to purchase additional
shares in the offering is not exercised. This table should be read in
conjunction with our consolidated financial statements, related notes and the
other information included or incorporated by reference in this prospectus.

<TABLE>
<CAPTION>
                                                                  MARCH 31, 2000
                                                              -----------------------
                                                               ACTUAL     AS ADJUSTED
                                                              ---------   -----------
                                                                  (IN THOUSANDS)
<S>                                                           <C>         <C>
Long-term obligations:
  Long-term debt............................................  $260,000    $
  Other long-term liabilities...............................    29,156
                                                              --------    ----------
    Total long-term obligations.............................   289,156
Stockholders' equity:
  Preferred stock, $0.01 par value; 10,000,000 shares
    authorized; none issued or outstanding, actual and as
    adjusted................................................        --            --
  Common stock, $0.01 par value; 100,000,000 shares
    authorized; 49,183,035 shares issued and outstanding,
    actual and 53,183,035 shares issued and outstanding, as
    adjusted................................................       492
Paid-in capital.............................................   297,290
Other comprehensive income..................................     4,675
Retained earnings...........................................   316,883
                                                              --------    ----------
  Total stockholders' equity................................   619,340
                                                              --------    ----------
    Total capitalization....................................  $908,496    $
                                                              ========    ==========
</TABLE>

(1) The table above excludes:

    - 7,258,232 shares of common stock issuable upon exercise of stock options
      outstanding at March 31, 2000, with a weighted average exercise price of
      $18.72 per share;

    - 3,613,830 shares of common stock available for grant at March 31, 2000
      under our 1996 stock option plan;

    - 117,000 shares of common stock available for grant at March 31, 2000 under
      our 1993 directors' stock option plan;

    - 319,096 shares of common stock available for issuance at March 31, 2000
      under our employee stock purchase plan;

    - 313,396 shares of common stock issuable upon exercise of warrants
      outstanding at March 31, 2000, at a weighted average exercise price of
      $24.17 per share;

    - 6,274,131 shares of common stock issuable upon conversion of our 4 3/4%
      convertible subordinated notes.

                                       14
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA

    The following selected consolidated financial data should be read in
conjunction with our consolidated financial statements, related notes and other
financial information incorporated herein by reference and "Management's
Discussion and Analysis of Financial Condition and Results of Operations"
included elsewhere in this prospectus. The consolidated statement of operations
data for the fiscal years ended March 31, 1998 and March 31, 1999, and for the
nine months ended December 31, 1999, and the consolidated balance sheet data as
of March 31, 1998, March 31, 1999 and December 31, 1999 are derived from the
audited consolidated financial statements previously filed with the SEC. The
consolidated statement of operations data for the three months ended March 31,
1999 and March 31, 2000 and the consolidated balance sheet data as of March 31,
2000 are derived from our unaudited consolidated financial statements and
include, in the opinion of management, all adjustments, including normal
recurring adjustments, necessary to present fairly the financial information
therein. These results are not necessarily indicative of the results that may be
expected for future periods. All per share data below has been adjusted to
reflect a two-for-one stock split effected in the form of a stock dividend that
was paid on September 16, 1999.

<TABLE>
<CAPTION>
                                                                                NINE MONTH
                                                                               FISCAL PERIOD
                                                        FISCAL YEAR ENDED          ENDED         THREE MONTHS ENDED
                                                     -----------------------     DECEMBER      -----------------------
                                                     MARCH 31,    MARCH 31,         31,        MARCH 31,    MARCH 31,
                                                        1998         1999       1999(1)(2)        1999         2000
                                                     ----------   ----------   -------------   ----------   ----------
                                                                                                     (UNAUDITED)
                                                                   (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                  <C>          <C>          <C>             <C>          <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenue............................................   $245,894     $200,072      $269,699       $53,788     $ 126,055
Costs and expenses:
  Cost of products sold............................     98,883       78,440       108,687        20,743        49,585
  Research and development.........................     32,012       33,190        45,903         8,877        18,243
  Selling, general and administrative..............     39,934       36,818        50,676         9,476        19,514
  In-process research and development..............         --           --        89,003            --            --
  Amortization of intangible assets................         --           --        45,780            --        20,362
                                                      --------     --------      --------       -------     ---------
    Total costs and expenses.......................    170,829      148,448       340,049        39,096       107,704
Income (loss) from operations......................     75,065       51,624       (70,350)       14,692        18,351
Other income (expense), net........................     10,643       10,668        (4,120)        2,860       148,799(3)
                                                      --------     --------      --------       -------     ---------
Income (loss) before provision (benefit) for income
  taxes............................................     85,708       62,292       (74,470)       17,552       167,150
Provision (benefit) for income taxes...............     29,141       20,246       (27,989)        5,704        62,329
                                                      --------     --------      --------       -------     ---------
Income (loss) before extraordinary item............     56,567       42,046       (46,481)       11,848       104,821
Extraordinary item, net of income taxes............         --           --        (1,665)           --            --
                                                      --------     --------      --------       -------     ---------
Net income (loss)..................................   $ 56,567     $ 42,046      $(48,146)      $11,848     $ 104,821
                                                      ========     ========      ========       =======     =========
Basic net income (loss) per share, before
  extraordinary item...............................   $   1.22     $    .90      $   (.97)      $   .25     $    2.15
                                                      ========     ========      ========       =======     =========
Diluted net income (loss) per share, before
  extraordinary item...............................   $   1.18     $    .88      $   (.97)      $   .24     $    1.84
                                                      ========     ========      ========       =======     =========
Basic net income (loss) per share..................   $   1.22     $    .90      $  (1.01)      $   .25     $    2.15
                                                      ========     ========      ========       =======     =========
Diluted net income (loss) per share................   $   1.18     $    .88      $  (1.01)      $   .24     $    1.84
                                                      ========     ========      ========       =======     =========
Shares used in per share calculations:
  Basic............................................     46,478       46,974        47,714        47,076        48,738
                                                      ========     ========      ========       =======     =========
  Diluted..........................................     47,788       47,638        47,714        48,398        58,409
                                                      ========     ========      ========       =======     =========
</TABLE>

                                       15
<PAGE>

<TABLE>
<CAPTION>
                                                                    MARCH 31,
                                                              ---------------------    DECEMBER 31,     MARCH 31,
                                                                1998        1999           1999           2000
                                                              ---------   ---------   --------------   -----------
                                                                                                       (UNAUDITED)
                                                                                      (IN THOUSANDS)
<S>                                                           <C>         <C>         <C>              <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash, cash equivalents and short-term investments...........  $267,110    $319,434       $214,140       $ 237,804
Working capital.............................................   283,678     324,204        152,758         209,018
Total assets................................................   489,066     540,896        916,155       1,078,608
Long-term debt..............................................        --          --        260,000         260,000
Stockholders' equity........................................   434,686     483,734        482,773         619,340
</TABLE>

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

(1) In 1999, we changed our fiscal year end from March 31 to December 31. This
    period includes financial results for our acquisition of Vantis since
    June 15, 1999.

(2) Includes the effects of an $89.0 million charge for in-process research and
    development and the related income tax effects incurred and recorded in
    conjunction with our acquisition of Vantis on June 15, 1999, and an
    extraordinary loss of $1.7 million, net of income taxes, for unamortized
    debt issuance costs related to bank debt retired with the proceeds from our
    issuance of 4 3/4% convertible subordinated notes during the period. See
    Notes 4 and 8 to the consolidated financial statements for the period ended
    December 31, 1999 incorporated by reference in this prospectus.

(3) Includes the effects of a $150 million gain ($92.1 million after-tax)
    representing the appreciation of investments made in two Taiwanese
    semiconductor foundry companies. See Note 10 to the unaudited consolidated
    financial statements for the period ended March 31, 2000 incorporated by
    reference in this prospectus.

                                       16
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS

OVERVIEW

    We design, develop and market high performance programmable logic devices,
or PLDs, and related software. We are the world's leading supplier of in-system
programmable, or ISP, logic devices. PLDs are widely used 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. Our products are sold worldwide through an extensive network
of independent sales representatives and distributors, primarily to OEMs in the
fields of data communications and telecommunications, as well as computing,
industrial and military systems. Approximately one-half of our revenue is
derived from export sales, mainly to Europe and Asia. We were founded in 1983
and are based in Hillsboro, Oregon.

    In June 1999, we acquired Vantis Corporation from Advanced Micro Devices
("AMD") for approximately $500 million in cash. The transaction is being
accounted for under the purchase method in our consolidated financial statements
beginning in the period ended July 3, 1999. We have also agreed with AMD to sign
a mutual election under the Internal Revenue Code that will allow us to deduct
the purchase price for tax purposes over a 15-year period. We believe that this
acquisition has increased our share of the PLD market, accelerated development
of new products and technologies and expanded our penetration into new and
existing customers.

    In March 1997, we entered into an advance payment production agreement with
Seiko Epson and its affiliated U.S. distributor, Epson Electronics
America, Inc., under which we agreed to advance approximately $85 million,
payable upon completion of specific milestones, to Seiko Epson to finance
construction of an eight-inch sub-micron wafer manufacturing facility. Under the
terms of the agreement, the advance is to be repaid with semiconductor wafers
over a multi-year period. The agreement calls for wafers to be supplied by Seiko
Epson through Epson Electronics America, Inc. pursuant to purchase agreements
with Epson Electronics America, Inc. We also have an option under this agreement
to advance Seiko Epson an additional $60 million for additional wafer supply
under similar terms. The first payment pursuant to this agreement, approximately
$17.0 million, was made during fiscal 1997. During fiscal 1998, we made two
additional payments aggregating approximately $34.2 million. The balance of the
advance payment is currently anticipated to be made in two installments during
fiscal 2000.

    In September 1995, we entered into a series of agreements with UMC pursuant
to which we agreed to join UMC and several other companies to form a separate
Taiwanese company, UICC, for the purpose of building and operating an advanced
semiconductor manufacturing facility in Taiwan. Under the terms of the
agreement, we invested approximately $49.7 million between fiscal 1996 and
fiscal 1998 for an approximate 10% equity interest in UICC and the right to
purchase a percentage of the facility's wafer production at market prices.

    In October 1996, we entered into an agreement with Utek Corporation, a
public Taiwanese company in the wafer foundry business that became affiliated
with the UMC Group in 1998, pursuant to which we agreed to make a series of
equity investments totaling approximately $17.5 million in Utek under specific
terms. In exchange for these investments we received the right to purchase a
percentage of Utek's wafer production.

    On January 3, 2000, UICC and Utek merged into UMC. We own approximately
73 million shares of UMC common stock and have retained our capacity rights. Due
to contractual and regulatory restrictions, the majority of our UMC shares may
not be sold until July 2000. These regulatory restrictions will gradually expire
between July 2000 and January 2004.

    In the fourth quarter of calendar 1999, we changed our reporting period to a
52 or 53 week year ending on the Saturday closest to December 31 from a 52 or 53
week fiscal year ending on the Saturday closest to March 31. For purposes of
this report and for ease of presentation, December 31 or March 31

                                       17
<PAGE>
has been utilized as the fiscal year end date for all financial statement
captions contained herein. Additionally, the nine month fiscal period ended
January 1, 2000 is referred to as "the nine months ended December 31, 1999 or
"fiscal period 1999." The fiscal period ended April 3, 1999 is referred to as
"the fiscal year ended March 31, 1999" or "fiscal year 1999," and the fiscal
period ended March 31, 1998 is referred to as "the fiscal year ended March 31,
1998" or "fiscal year 1998."

RESULTS OF OPERATIONS

    The following table sets forth, for the periods indicated, the percentage of
revenue represented by selected items reflected in our consolidated statement of
operations:

<TABLE>
<CAPTION>
                                                                              NINE MONTH
                                                           YEAR ENDED        FISCAL PERIOD   THREE MONTHS ENDED
                                                            MARCH 31,            ENDED            MARCH 31,
                                                       -------------------   DECEMBER 31,    -------------------
                                                         1998       1999         1999          1999       2000
                                                       --------   --------   -------------   --------   --------
<S>                                                    <C>        <C>        <C>             <C>        <C>
Revenue..............................................    100%       100%              100%     100%       100%
Costs and expenses:
  Cost of products sold..............................     40         39                40       39         39
  Research and development...........................     13         17                17       16         14
  Selling, general and administrative................     16         18                19       18         16
  In-process research and development................     --         --                33       --         --
  Amortization of intangible assets..................     --         --                17       --         16
                                                         ---        ---           -------      ---        ---
    Total costs and expenses.........................     69         74               126       73         85
                                                         ---        ---           -------      ---        ---
Income (loss) from operations........................     31         26               (26)      27         15
Other income (expense), net..........................      4          5                (2)       5        118
                                                         ---        ---           -------      ---        ---
Income (loss) before provision (benefit) for income
  taxes..............................................     35         31               (28)      32        133
Provision (benefit) for income taxes.................     12         10               (11)      10         49
                                                         ---        ---           -------      ---        ---
Income (loss) before extraordinary item..............     23         21               (17)      22         84
Extraordinary item, net of income taxes..............     --         --                (1)      --         --
                                                         ---        ---           -------      ---        ---
Net income (loss)....................................     23%        21%              (18)%     22%        84%
                                                         ===        ===           =======      ===        ===
</TABLE>

THREE MONTHS ENDED MARCH 31, 2000 COMPARED TO THREE MONTHS ENDED MARCH 31, 1999

    REVENUE.  Revenue for the first quarter of 2000 increased $72.3 million or
134% as compared to the first quarter of 1999. In addition to our acquisition of
Vantis, the revenue increase was attributable to increased sales of high density
products in all geographies and recovering demand from Asia.

    Overall average selling prices increased slightly in the first quarter of
2000 as compared to the first quarter of 1999. Fluctuations in overall average
selling prices were due primarily to product mix changes and increased demand.
Although selling prices of mature products generally decline over time, this
decline is at times offset by higher selling prices of new products. Our ability
to achieve revenue growth is in large part dependent on the continued
development, introduction and market acceptance of new products.

    GROSS MARGIN.  Gross margin as a percentage of revenue was 60.7% in the
first quarter of 2000 as compared to 61.4% in the first quarter of 1999. The
gross margin decline in the first quarter of 2000 as compared to the first
quarter of 1999 is attributable to our acquisition of Vantis on June 15, 1999.
The decline was partially offset by an improvement in product mix and reductions
in our manufacturing costs. Reductions in manufacturing costs resulted primarily
from yield improvements, migration of products to more advanced technologies and
smaller die sizes, and wafer price reductions.

                                       18
<PAGE>
    RESEARCH AND DEVELOPMENT.  Research and development ("R&D") expenses
increased by approximately $9.4 million, or 106%, in the first quarter of 2000
when compared to the first quarter of 1999. In addition to the acquisition of
Vantis, spending increases resulted primarily from the development of new
products. We believe that a continued commitment to research and development is
essential in order to maintain product leadership of our existing product
families and to provide innovative new product offerings, and therefore we
expect to continue to make significant future investments in research and
development.

    SELLING, GENERAL AND ADMINISTRATIVE.  Selling, general and administrative
("SG&A") expenses increased $10.0 million, or 106%, in the first quarter of 2000
when compared to the first quarter of 1999. This increase was primarily due to
our Vantis acquisition, and to a lesser extent, increased variable costs
associated with higher revenue levels.

    AMORTIZATION OF INTANGIBLE ASSETS.  Amortization of intangible assets
acquired in the Vantis acquisition was $20.4 million for first quarter of 2000.
The estimated weighted average useful life of the intangible assets for current
technology, assembled workforce, customer lists, trademarks, patents and
residual goodwill, created as a result of the acquisition, is approximately five
years.

    GAIN ON APPRECIATION OF FOUNDRY INVESTMENTS.  The gain on appreciation of
foundry investments in the first quarter of 2000 represents appreciation of
foundry investments made in two Taiwanese companies, UICC and Utek. See Note 10
to our consolidated financial statements for the period ended March 31, 2000,
which are incorporated by reference into this prospectus.

    OTHER INCOME (EXPENSE), NET.  Other income (expense), net decreased by
approximately $4.0 million in the first quarter of fiscal 2000 as compared to
the first quarter of 1999. This was primarily due to interest expense of
approximately $3.0 million from acquisition related debt and reduced interest
income resulting from lower cash and investment balances resulting from our
acquisition of Vantis.

    PROVISION FOR INCOME TAXES.  The provision for income taxes for the first
quarter of 2000 is 37.3% of pretax income, as compared to 32.5% for the first
quarter of 1999. The rate change for the first quarter of 2000 as compared to
the first quarter of 1999 was due primarily to a decrease in the proportion of
tax-exempt interest income included in our overall net income and as a result of
application of our marginal tax rate on the unrealized gain on appreciation of
foundry investments.

FISCAL PERIOD ENDED DECEMBER 31, 1999, FISCAL YEAR 1999 AND FISCAL YEAR 1998

    REVENUE.  Revenue was $269.7 million in fiscal period 1999, an increase of
35% from fiscal year 1999. Fiscal year 1999 revenue of $200.1 million
represented a decrease of 19% from the $245.9 million recorded in fiscal year
1998.

    In addition to our acquisition of Vantis, the revenue increase in fiscal
period 1999 as compared to fiscal year 1999 was attributable to increased sales
of ISP products and recovering demand from Asia. Fiscal year 1999 revenue as
compared to fiscal 1998 was negatively impacted by a decline in demand from Asia
due to the economic crisis in that region. Furthermore, revenue in all
geographies was negatively impacted by a decline in demand for our non-ISP
product families.

                                       19
<PAGE>
    Our sales by geographic area were as follows:

<TABLE>
<CAPTION>
                                                                                     NINE MONTH
                                                                                    FISCAL PERIOD
                                                            YEAR ENDED MARCH 31,        ENDED
                                                            ---------------------   DECEMBER 31,
                                                              1998        1999          1999
                                                            ---------   ---------   -------------
                                                                       (IN THOUSANDS)
<S>                                                         <C>         <C>         <C>
United States.............................................  $120,278    $100,778       $126,333
Export sales:
  Europe..................................................    61,243      53,649         70,641
  Asia....................................................    55,853      34,680         55,003
  Other...................................................     8,520      10,965         17,722
                                                            --------    --------       --------
                                                            $245,894    $200,072       $269,699
                                                            ========    ========       ========
</TABLE>

    Revenue from export sales as a percentage of total revenue was approximately
53% for fiscal period 1999, 50% for fiscal year 1999 and 51% for fiscal year
1998. We expect export sales to continue to represent a significant portion of
revenue.

    The average selling price of our products decreased slightly in fiscal
period 1999 as compared to fiscal year 1999. The average selling price of our
products was flat in fiscal year 1999 as compared to fiscal year 1998. The
decrease in fiscal period 1999 was due primarily to changes in product mix.
Although selling prices of mature products generally decline over time, this
decline is at times offset by higher selling prices of new products. Our ability
to maintain or increase the level of our average selling price is dependent on
the continued development, introduction and market acceptance of new products.

    GROSS MARGIN.  Our gross margin as a percentage of revenue was 60% for
fiscal period 1999, 61% for fiscal year 1999 and 60% for fiscal year 1998. The
gross margin decline in fiscal period 1999 as compared to fiscal year 1999 is
attributable to our acquisition of Vantis on June 15, 1999. The decline was
partially offset by an improvement in product mix and reductions in our
manufacturing costs. The improvement in fiscal year 1999 as compared to fiscal
year 1998 was primarily due to an improvement in product mix and reductions in
our manufacturing costs. Reductions in manufacturing costs resulted primarily
from yield improvements, migration of products to more advanced technologies and
smaller die sizes, and wafer price reductions.

    RESEARCH AND DEVELOPMENT.  Research and development expense was
$45.9 million in fiscal period 1999, $33.2 million in fiscal year 1999 and
$32.0 million in fiscal year 1998. For fiscal period 1999, in addition to our
acquisition of Vantis, spending increases resulted primarily from the increased
development of new products. Spending increases in fiscal year 1999 as compared
to fiscal year 1998 resulted primarily from the increased development of new
products. We believe that a continued commitment to research and development is
essential in order to maintain product leadership in our existing product
families and provide innovative new product offerings, and therefore we expect
to continue to make significant future investments in research and development.

    SELLING, GENERAL AND ADMINISTRATIVE.  Selling, general and administrative
expense was $50.7 million in fiscal period 1999, $36.8 million in fiscal year
1999 and $39.9 million in fiscal year 1998. The increase in the 1999 fiscal
period as opposed to fiscal year 1999 was primarily due to our Vantis
acquisition and to a lesser extent attributable to increased variable costs
associated with higher revenue levels. The decrease in fiscal year 1999 expense
as compared to fiscal year 1998 was primarily due to decreased variable costs
associated with lower revenue levels.

    IN-PROCESS RESEARCH AND DEVELOPMENT.  On June 15, 1999, we bought from AMD
all of the outstanding capital stock of Vantis Corporation for approximately
$500 million in cash in a transaction accounted for under the purchase method of
accounting. Including liabilities assumed and purchase

                                       20
<PAGE>
accounting reserves established, the total purchase cost was $583.1 million, of
which $511.6 million was allocated to intangible assets. A portion of the
intangible asset value was in-process research and development, or IPR&D, with a
value of approximately $89 million which was charged to expense on the
acquisition date as required by generally accepted accounting principles. The
remaining $422.6 million of intangible asset value consisting of existing
technology, assembled workforce, customer lists, patents, trademarks and
goodwill, is being amortized to operations over 5 years using the straight-line
method.

    AMORTIZATION OF INTANGIBLE ASSETS.  Amortization of intangible assets
acquired in the Vantis acquisition was $45.8 million for fiscal period 1999. The
estimated weighted average useful life of the intangible assets for current
technology, assembled workforce, customer lists, trademarks, patents and
residual goodwill, created as a result of the acquisition, is approximately five
years.

    OTHER INCOME (EXPENSE), NET.  Other income (expense), net, was ($4.1)
million for fiscal period 1999, a $14.8 million decrease as compared to fiscal
year 1999. This was primarily due to interest expense of approximately
$9.7 million from acquisition related debt and reduced interest income resulting
from lower cash and investment balances in conjunction with the acquisition.
Other income (expense), net, was approximately flat for fiscal year 1999 as
compared to fiscal year 1998, as higher cash and investment balances were offset
by lower interest rates for invested balances, particularly in the second half
of the fiscal year.

    PROVISION FOR INCOME TAXES.  The benefit for income taxes for fiscal period
1999 was 37.6% of the loss before benefit for income taxes. This reflects the
estimated rate at which income taxes would be recoverable if a loss tax return
were filed. The loss before benefit for income taxes is attributable to the
IPR&D charge during the period of approximately $89.0 million and intangible
asset amortization of $45.8 million. If these charges were not present, we would
have had taxable income and an income tax rate of approximately 36.5%. Our
effective tax rate was 32.5% for fiscal year 1999 and 34.0% for fiscal year
1998. The rate change in fiscal year 1999 as compared to fiscal year 1998 was
due primarily to changes in the proportion of tax-exempt interest income
included in our overall net income. The fiscal 1999 tax rate was also favorably
impacted by reduced state taxes resulting from the increased realization of tax
credits.

    EXTRAORDINARY ITEM, NET OF INCOME TAXES.  The extraordinary item, net of
income taxes, represents the writeoff of unamortized loan fees related to the
$220 million term loan repaid in conjunction with the placement of our 4 3/4%
convertible subordinated notes.

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

    As of March 31, 2000 and December 31, 1999, our investment portfolio
consisted of fixed income securities of $213.7 million and $182.1 million,
respectively. As with all fixed income instruments, these securities are subject
to interest rate risk and will decline in value if market interest rates
increase. If market rates were to increase immediately and uniformly by 10% from
levels as of March 31, 2000 and December 31, 1999, the decline in the fair value
of the portfolio would not be material. Further, we have the ability to hold its
fixed income investments until maturity and, therefore, we would not expect to
recognize such an adverse impact in income or cash flows.

    We have an international subsidiary and branch operations. Additionally, the
majority of our silicon wafer purchases are denominated in Japanese yen. We are,
therefore, subject to foreign currency rate exposure. To mitigate rate exposure
with respect to yen-denominated wafer purchases, we maintain yen-denominated
bank accounts and bill our Japanese customers in yen. The yen bank deposits are
used to hedge yen-denominated wafer purchases against specific and firm wafer
purchases. If the foreign currency rates fluctuate by 10% from rates at
March 31, 2000 and December 31, 1999, the effect on our consolidated financial
statements would not be material. However, there can be no assurance that there
will not be a material impact in the future.

                                       21
<PAGE>
LIQUIDITY AND CAPITAL RESOURCES

    As of March 31, 2000, our principal source of liquidity was $237.8 million
of cash and short-term investments, an increase of $23.7 million from the
balance of $214.1 million at December 31, 1999. The increase was due primarily
to cash generated from operations and exercises of stock options. During the
first quarter of 2000, we generated approximately $5.2 million of cash and cash
equivalents from our operating activities as compared with $16.1 million during
the first quarter of 1999. This change is attributable to non-cash working
capital accounts as further described below.

    Accounts receivable at March 31, 2000 increased by $25.1 million, or 74%, as
compared to the balance at December 31, 1999. This increase was primarily due to
the timing of shipments within the quarter and increased revenue levels.
Inventories increased by $4.6 million, or 18%, as compared to the balance at
December 31, 1999 primarily due to increased production in response to higher
revenue levels. Prepaid expenses and other current assets increased by $5.6
million, or 54%, as compared to the balance at December 31, 1999 primarily due
to an increase in the current portion of wafer supply advances. Current deferred
income tax assets increased $6.2 million, or 21%, as compared to the balance at
December 31, 1999 primarily due to the increase in deferred income for sales to
distributors which is recognized currently for income tax purposes, and to a
lesser extent the timing of deductions for certain expenses and allowances.
Intangible assets, net, decreased by $21.5 million, or 6%, as compared to the
balance at December 31, 1999, primarily due to amortization of goodwill and
other intangibles.

    The $3.9 million, or 31%, decrease in income taxes payable as compared to
the balance at December 31, 1999 is primarily attributable to the timing of tax
deductions and payments. Deferred income increased by $9.0 million, or 20%, as
compared to the balance at December 31, 1999, due primarily to increased
billings to distributors associated with higher revenue levels. Deferred income
tax liabilities at March 31, 2000 principally represent the $57.9 million in
taxes provided for approximately $150 million pre-tax gain on appreciation of
foundry investments in Taiwan recorded on January 3, 2000 (see note 10 to
March 31, 2000 consolidated financial statements on Form 10-Q incorporated by
reference into this prospectus) and $2.9 million provided for the subsequent
appreciation of non-restricted foundry shares (see note 10 to March 31, 2000
consolidated financial statements on Form 10-Q incorporated by reference into
this prospectus), offset by $45.4 million in non-current deferred tax assets
relating primarily to intangible asset charges. Such deferred tax assets
increased by approximately $6.3 million, or 16%, as compared to the balance at
December 31, 1999, due primarily to the increased cumulative temporary
differences for book and tax deductions of intangible assets.

    On October 28, 1999, we issued $260 million in 4 3/4% convertible
subordinated notes due on November 1, 2006. These notes require that we pay
interest semi-annually on May 1 and November 1. Holders of these notes may
convert them into shares of our common stock at any time on or before
November 1, 2006, at a conversion price of $41.44 per share, subject to
adjustment in certain events. Beginning on November 6, 2002 and ending on
October 31, 2003, we may redeem the notes in whole or in part at a redemption
price of 102.71% of the principal amount. In the subsequent three twelve-month
periods, the redemption price declines to 102.04%, 101.36% and 100.68% of
principal, respectively. The notes are subordinated in right of payment to all
of our senior indebtedness, and are subordinated to all liabilities of our
subsidiaries. At March 31, 2000, we had no senior indebtedness and our
subsidiaries had $17.2 million of other liabilities. Issuance costs relative to
the convertible subordinated notes are included in Other Assets and aggregated
approximately $6.9 million and are being amortized to expense over the lives of
the notes. Accumulated amortization amounted to approximately $770,000 at
March 31, 2000.

    Capital expenditures were approximately $8.6 million in the first quarter of
2000. We expect to spend approximately $30 million to $40 million in capital
expenditures for the fiscal year ending December 31, 2000.

                                       22
<PAGE>
    In March 1997, we entered into an advance payment production agreement with
Seiko Epson and its affiliated U.S. distributor, Epson Electronics America,
under which we agreed to advance approximately $85 million, payable upon
completion of specific milestones, to Seiko Epson to finance construction of an
eight-inch sub-micron wafer manufacturing facility. Under the terms of the
agreement, the advance is to be repaid with semiconductor wafers over a
multi-year period. The agreement calls for wafers to be supplied by Seiko Epson
through Epson Electronics America, pursuant to purchase agreements with Epson
Electronics America. We also have an option under this agreement to advance
Seiko Epson an additional $60 million for additional wafer supply under similar
terms. The first payment pursuant to this agreement, approximately $17.0
million, was made during fiscal 1997. During fiscal 1998, we made two additional
payments aggregating approximately $34.2 million. The balance of the advance
payment is currently anticipated to be made in future installments.

    We entered into a series of agreements with UMC in September 1995, pursuant
to which we agreed to join UMC and several other companies to form a separate
Taiwanese company, UICC, for the purpose of building and operating an advanced
semiconductor manufacturing facility in Taiwan. Under the terms of the
agreements, we invested approximately $49.7 million for an approximate 10%
equity interest in UICC and the right to receive a percentage of the facility's
wafer production at market prices.

    In October 1996, we entered into an agreement with Utek, a public Taiwanese
company in the wafer foundry business that became affiliated with the UMC Group
in 1998, pursuant to which we agreed to make a series of equity investments
totaling approximately $17.5 million in Utek under specific terms. In exchange
for these investments we received the right to purchase a percentage of Utek's
wafer production.

    On January 3, 2000, UICC and Utek merged into UMC. We own approximately
73 million shares of UMC common stock and have retained our capacity rights. Due
to contractual and regulatory restrictions, the majority of our UMC shares may
not be sold until July 2000, or later. These regulatory restrictions will
gradually expire between July 2000 and January 2004.

    In June 1999, as part of our acquisition of Vantis, we entered into a series
of agreements with AMD to support the continuing operations of Vantis. AMD has
agreed to provide us with finished silicon wafers through September 2003 in
quantities based either on a rolling six-month or an annual forecast. We have
committed to buy certain minimum quantities of wafers and AMD has committed to
supply certain quantities of wafers during this period. Wafers for our products
are manufactured in the United States at multiple AMD wafer fabrication
facilities. Prices for these wafers will be reviewed and adjusted periodically.

    We believe that our expected net proceeds from this offering, existing cash
and cash equivalents, expected cash generation from operations and existing
credit facilities combined with our ability to borrow additional funds will be
adequate to meet our operating and capital requirements and obligations for the
next 12 months.

    In an effort to secure additional wafer supply, we may from time to time
consider various financial arrangements including joint ventures, equity
investments, advance purchase payments, loans, or similar arrangements with
independent wafer manufacturers in exchange for committed wafer capacity. To the
extent that we pursue any such additional wafer financing arrangements,
additional debt or equity financing may be required. We may in the future seek
new or additional sources of funding. There can be no assurance that such
additional financing will be available when needed or, if available, will be on
favorable terms. Any future equity financing will decrease existing
stockholders' equity percentage ownership and may, depending on the price at
which the equity is sold, result in dilution.

                                       23
<PAGE>
                                    BUSINESS

    Lattice Semiconductor Corporation designs, develops and markets high
performance programmable logic devices, or PLDs, and related software. We are
the world's leading supplier of in-system programmable, or ISP-TM-, logic
devices. Programmable logic devices are widely-used 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. Our end customers are primarily original equipment manufacturers in the
markets of data communications and telecommunications, as well as computing,
industrial and military systems. During the March 2000 quarter, we derived
approximately 65% of our $126 million in revenue from the communications market
and approximately 21% from the computing market.

    In June 1999, we acquired Vantis Corporation, the programmable logic device
subsidiary of Advanced Micro Devices. This acquisition has increased our share
of the PLD market, accelerated development of new products and technologies and
expanded our penetration into new and existing customers.

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 contains 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 functions 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 digital electronic
equipment including communication, computing, industrial and military systems.
According to World Semiconductor Trade Statistics, a semiconductor industry
association, logic accounted for approximately 27% of the estimated
$130 billion worldwide digital integrated circuit market in 1999. The logic
market encompasses, among other segments, standard logic, custom-designed
application specific integrated circuits, or ASICs, which include conventional
gate-arrays, standard cells and full custom logic circuits, and PLDs.

    Manufacturers of electronic equipment 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. PLDs address 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 functions by
programming the device with electrical signals. PLDs give system designers the
ability to quickly create custom logic functions to provide product
differentiation without sacrificing rapid time to market. Certain PLD products,
including our own, are reprogrammable, meaning that the logic configuration can
be modified, if needed, after the initial programming. ISP PLDs, pioneered by
us, extend the flexibility of standard reprogrammable PLDs by allowing the
system designer to configure and reconfigure the logic functions of the PLD with
standard 5-volt or 3.3-volt power supplies without removing the PLD from the
system board.

    According to Dataquest, the PLD market in 1999 was approximately
$2.5 billion. The PLD market has two primary segments: low-density PLDs, with
fewer than 1,000 logic gates, and high-density PLDs, with more than 1,000 logic
gates. High-density PLD devices include devices based on both the CPLD and

                                       24
<PAGE>
field programmable gate array, or FPGA, architectures. In 1999, Dataquest
estimated that the CPLD market was $0.9 billion and the FPGA market was
$1.4 billion.

    Products based on these alternative high density PLD architectures are
generally optimal for different types of logic functions, although many logic
functions can be implemented using either architecture. CPLDs are characterized
by a regular building block structure of wide-input logic cells, called
macrocells, and use of a centralized logic interconnect scheme. FPGAs are
characterized by a narrow-input logic cell and use a distributed interconnect
scheme. Although CPLDs and FPGAs are better suited for use in different types of
logic applications, we believe 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.

    A growing percentage of the PLD market is made up of devices which operate
using 3.3-volt and 2.5-volt power supplies. Lower voltage PLDs benefit end users
by consuming less power and providing compatibility with other advanced
electronic components. We believe that our innovative low-voltage CPLD products
provide us a competitive advantage in the emerging market for low voltage PLDs.

TECHNOLOGY

    We believe that our proprietary E2CMOS technology is the preferred process
technology for PLD products due to its inherent performance, reprogrammability
and testability benefits. E2CMOS technology, through its fundamental ability to
be programmed and erased electronically, serves as the foundation for our ISP
products.

    We pioneered the development of in-system programmability which has become
an industry standard feature in the PLD market. Our ISP devices use either
5-volt or 3.3-volt programming signals and, as a result, can be configured and
reconfigured by a system designer without being removed from the printed circuit
board. Standard E2CMOS PLDs require a 12-volt programming signal and therefore
must be removed from the printed circuit board and programmed using specialized
hardware. Our ISP devices offer enhanced flexibility compared to standard PLDs
and provide significant benefits to our customers. Our ISP devices can allow
customers to reduce design cycle times, accelerate time to market, reduce
prototyping costs, reduce manufacturing costs and lower inventory requirements.
Our ISP devices can also provide customers the opportunity to perform simplified
and cost-effective field reconfiguration through a data file transferred by
computer disk or serial data signal.

PRODUCTS

    We strive to offer innovative and differentiated programmable solutions
based on our proprietary technology.

HIGH DENSITY CPLD PRODUCTS

    Since 1992, we have focused on developing an industry leading portfolio of
high density products and increasing the percentage of our overall revenue
derived from this attractive market. At present we offer the broadest range of
ISP products in the marketplace. During 1999, approximately 68% of our revenues
were derived from high density products, as compared to 49% in 1996. In the
future, we plan to continue to introduce new families of innovative, high
performance and higher density programmable products, as well as improve the
performance and reduce the manufacturing cost of our existing product families
based on market needs.

                                       25
<PAGE>
    The key features of our CPLD product families are described in the table
below:

<TABLE>
<CAPTION>
                                                            PROPAGATION                                SURFACE
                                                 SPEED         DELAY                                    MOUNT
                                                 (MHZ)     (NANOSECONDS)           GATES                PINS
                                                --------   -------------   ---------------------   ---------------
<S>                                             <C>        <C>             <C>                     <C>
ispLSI-Registered Trademark- 1000/E/EA........    200           4.0                 2,000- 8,000            44-128
ispLSI 2000E/VE...............................    225           3.5                 1,000- 8,000            44-208
ispLSI 3000/E.................................    125           7.5                 7,000-20,000           160-432
ispLSI 5000V..................................    125           7.5                12,000-24,000           208-388
ispLSI 8000/V.................................    125           8.5                25,000-50,000           272-492
MACH-Registered Trademark- 1/2................    180           5.0                 1,000- 5,000            44-100
ispMACH-TM- 4/LV/A............................    180           5.0                 1,000-10,000            44-256
MACH 5/LV.....................................    180           5.5                 5,000-20,000           100-352
</TABLE>

    Our newest product families, the ispMACH 4A, ispLSI 2000VE, ispLSI 5000V and
ispLSI 8000V, use new innovative architectures and are targeted towards the
emerging low voltage portion of the CPLD market.

    ISPGDX-REGISTERED TRADEMARK-/V.  We recently introduced two new high density
product families, ispGDX and ispGDXV, that target a unique aspect of the
programmable logic market. These families extend in-system programmability to
the circuit board level using an innovative digital cross-point switch
architecture. Offered with propagation delays as low as 3.5 nanoseconds, up to
160 input/output pins and complete pin-to-pin signal routing, both the 5-volt
ispGDX and the 3.3-volt ispGDXV are targeted towards digital signal interconnect
and interface applications.

MIXED SIGNAL PRODUCTS

    We have recently added mixed signal products to our portfolio as we believe
these devices provide an opportunity to extend our proprietary technology to an
untapped potential market.

    ISPPAC-REGISTERED TRADEMARK- PRODUCTS.  First introduced in 1999, this three
device family extends in-system programmability to the analog market. The
innovative architecture of the ispPAC allows designers to quickly and easily
program resistor and capacitor values, gain and signal polarity and circuit
interconnect to implement a wide variety of analog circuits. The initial ispPAC
products are targeted towards filtering and signal conditioning applications and
can replace numerous discrete analog components. ispPAC designs are implemented
and programmed via a personal computer using our software development tool,
PAC-Designer-TM-.

SOFTWARE DEVELOPMENT TOOLS

    All Lattice ISP products are supported by ispDesignEXPERT-TM-, our fourth
generation software development tool suite. Supporting both the PC and UNIX
platforms, ispDesignEXPERT allows a customer to enter, verify and synthesize a
design, perform logic simulation and timing analysis, assign input/output pins
and critical speed paths, debug and floorplan a design, execute automatic place
and route tasks and download a program to an ISP device. Seamlessly integrated
with third-party electronic design automation, or EDA, environments,
ispDesignEXPERT leverages customers' prior investments in products offered by
Aldec, Cadence, Innoveda, Mentor Graphics, OrCAD, Synopsys, Synplicity and
Veribest. In the future, we plan to continue to enhance and expand the
capability of our software development tool suite.

    We also provide a variety of software algorithms that support in-system
programming of our ISP devices via multiple formats and mechanisms. These
software products include ispCODE-Registered Trademark-, Turbo
ispDOWNLOAD-Registered Trademark-, ispREMOTE-TM-, ispATE-TM-, ispSVF-TM- and
ispVM-TM-.

                                       26
<PAGE>
LOW DENSITY PLD PRODUCTS

    We offer the industry's broadest line of low-density CMOS PLDs based on our
22 families of GAL-Registered Trademark- and PALCE-Registered Trademark-
products offered in over 200 speed, power, package and temperature range
combinations. PALCE products were originally introduced by Vantis and are
generally compatible with GAL products. GAL and PALCE 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. We offer standard 610,
16V8, 20V8 and 22V10 architectures in a variety of speed grades, with
propagation delays as low as 3.5 nanoseconds, the highest performance in the
industry. In addition, we offer several proprietary extension architectures, the
isp22V10, 6001/2, 16VP8, 16V8Z, 18V10, 20VP8, 20V8Z, 22V10Z, 24V10, 29M16,
20RA10, 20XV10 and 26V12, each of which is optimized for specific applications.
We also offer a full range of 3.3-volt standard architectures, the isp22LV10,
16LV8, 20LV8, 22LV10 and 26CLV12, in a variety of speed grades, with propagation
delays as low as 3.5 nanoseconds, the highest performance in the industry.

PRODUCT DEVELOPMENT

    We place substantial emphasis on new product development and believe that
continued investment in this area is required to maintain our competitive
position. Our product development activities emphasize new proprietary ISP
products, enhancement of existing products and process technologies and
improvement of software development tools. Product development activities occur
in Hillsboro, Oregon; Silicon Valley, California; Austin, Texas; Colorado
Springs, Colorado; Corsham, England; and Shanghai, China.

    Research and development expenses were $32.0 million in fiscal year 1998,
$33.2 million in fiscal year 1999 and $45.9 million for fiscal period 1999. We
expect to continue to make significant future investments in research and
development.

OPERATIONS

    We do not manufacture our own silicon wafers. We maintain strategic
relationships with large semiconductor manufacturers to source our finished
silicon wafers. This strategy allows us to focus our internal resources on
product, process and market development, and eliminates the fixed cost of owning
and operating manufacturing facilities. We are also able to take advantage of
the ongoing advanced process technology dedicated development efforts of
semiconductor manufacturers. In addition, all of our assembly operations are
performed by outside suppliers. We perform certain test operations and
reliability and quality assurance processes internally. We have achieved an ISO
9001 quality certification, an indication of our high internal operational
standards.

WAFER FABRICATION

    The majority of our silicon wafer requirements have historically been
supplied by Seiko Epson in Japan pursuant to an agreement with Epson Electronics
America, an affiliated U.S. distributor of Seiko Epson. We negotiate wafer
volumes, prices and terms with Seiko Epson and Epson Electronics America on a
periodic basis. We also receive silicon wafers from the UMC Group in Taiwan
pursuant to a series of agreements entered into in 1995. Wafer prices and other
purchase terms related to this commitment are subject to periodic adjustment.
Currently, the majority of the silicon wafers for our MACH and PALCE products
are manufactured by AMD pursuant to an agreement first entered into in 1996 and
subsequently amended and restated at the time of our acquisition of Vantis.

ASSEMBLY

    After wafer fabrication and initial testing, we ship wafers to independent
subcontractors for assembly. During assembly, wafers are separated into
individual die and encapsulated in plastic or ceramic

                                       27
<PAGE>
packages. Presently, we have qualified long-term assembly partners in Hong Kong,
Malaysia, the Philippines, Singapore, South Korea, Taiwan and Thailand.

TESTING

    We electrically test the die on each wafer prior to shipment for assembly.
Following assembly, prior to customer shipment, each product undergoes final
testing and quality assurance procedures. Final testing on certain products is
performed by independent contractors in Malaysia, the Philippines, South Korea,
Taiwan, Thailand and the United States.

MARKETING, SALES AND CUSTOMERS

    We sell our products directly to end customers through a network of
independent manufacturers' representatives and indirectly through a network of
independent distributors. We also employ a direct sales management and field
applications engineering organization to support our end customers and indirect
sales resources. Our end customers are primarily original equipment
manufacturers in the fields of communication, computing, industrial and military
systems.

    At July 2, 2000, we used 23 manufacturers' representatives and three
distributors in North America. Arrow Electronics and Avnet provide full
distribution coverage. We have also established export sales channels in over 30
foreign countries through a network of over 30 sales representatives and
distributors. Approximately one-half of our North American sales and the
majority of our export sales are made through distributors.

    We protect each of our North American distributors and some of our foreign
distributors against reductions in published prices, and expect to continue this
policy in the foreseeable future. We also allow returns from these distributors
of unsold products under certain conditions. For these reasons, we do not
recognize revenue until products are resold by these distributors to an end
customer.

    We provide technical and marketing support to our end customers with
engineering staff based at our headquarters, design centers and selected field
sales offices. We maintain numerous domestic and international field sales
offices in major metropolitan areas.

    Export sales as a percentage of our total revenue were 51% in fiscal year
1998, 50% in fiscal year 1999 and 53% in fiscal period 1999. Both export and
domestic sales are denominated in U.S. dollars, with the exception of sales to
Japan, which are dominated in yen. If our export sales decline significantly
there would be a material adverse impact on our business.

    Our products are sold to a large and diverse group of customers. Revenue
from one customer, the contract manufacturer Solectron, accounted for
approximately 10% of total revenues for the first quarter of 2000. No individual
end customer accounted for more than 10% of total revenue in fiscal year 1998 or
1999 or fiscal period 1999.

COMPETITION

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

    The principal competitive factors in the PLD market include product
features, price, customer support, and sales, marketing and distribution
strength. The availability of competitive software development tools is also
critical. In addition to product features such as density, 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. We believe that we

                                       28
<PAGE>
compete favorably with respect to each of these factors. We intend to continue
to address these competitive factors by working to continually introduce product
enhancements and new products, by seeking to establish our products as industry
standards in their respective markets, and by working to reduce the
manufacturing cost of our products.

    In the high density CPLD market, we directly compete primarily with Altera
and Xilinx, both of whom offer competing products. We also indirectly compete
with other PLD suppliers as well as other semiconductor companies who provide
non-PLD based logic solutions. Although to date we have not experienced
significant competition from companies located outside the United States, such
companies may become a more significant competitive factor in the future.
Competition may also increase as we and our current competitors seek to expand
our markets. Any such increases in competition could have a material adverse
effect on our operating results.

PATENTS

    We seek to protect our products and wafer fabrication process technologies
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 our intellectual property rights or that measures we
take to protect our technology will be effective.

    We hold numerous domestic, European and Japanese patents and have patent
applications pending in the United States, Japan and Europe. 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 we believe that our patents have value,
there can be no assurance that our patents, or any additional patents that may
be issued in the future, will provide meaningful protection from competition. We
believe that our success will depend primarily upon the technical expertise,
experience, creativity and the sales and marketing abilities of our personnel.

    Patent and other proprietary rights infringement claims are common in our
industry. There can be no assurance that, with respect to any claim made against
us, we could obtain a license on terms or under conditions that would not harm
our business.

LICENSES AND AGREEMENTS

SEIKO EPSON/EPSON ELECTRONICS AMERICA

    Epson Electronics America, an affiliated U.S. distributor of Seiko Epson,
has agreed to provide us with manufactured wafers in quantities based on
six-month rolling forecasts. We have committed to buy certain minimum quantities
of wafers per month. Wafers for our products are manufactured in Japan at Seiko
Epson's wafer fabrication facilities and are delivered to us by Epson
Electronics America. Prices for the wafers obtained from Epson Electronics
America are reviewed and adjusted periodically.

    In March 1997, we entered into an advance production payment agreement with
Seiko Epson and Epson Electronics America under which we agreed to advance
approximately $85.0 million, payable upon completion of specific milestones, to
Seiko Epson to finance construction of an eight-inch sub-micron semiconductor
wafer manufacturing facility. The timing of the payments is related to certain
milestones in the development of the facility. Under the terms of the agreement,
the advance is to be repaid with semiconductor wafers over a multi-year period.
The agreement calls for wafers to be supplied by Seiko Epson through Epson
Electronics America pursuant to purchase agreements concluded with Epson
Electronics America. We also have an option under the agreement to advance Seiko
Epson an additional $60.0 million for additional wafer supply under similar
terms. The first payment under this agreement,

                                       29
<PAGE>
approximately $17.0 million, was made during fiscal 1997. During fiscal 1998, we
made two additional payments aggregating approximately $34.2 million.

UMC GROUP

    In September 1995, we entered into a series of agreements with UMC pursuant
to which we agreed to join UMC and several other companies to form a separate
Taiwanese company, UICC, for the purpose of building and operating an advanced
semiconductor manufacturing facility in Taiwan. Under the terms of the
agreement, we invested approximately $49.7 million between fiscal 1996 and
fiscal 1998 for an approximate 10% equity interest in UICC and the right to
purchase a percentage of the facility's wafer production at market prices.

    In October 1996, we entered into an agreement with Utek Corporation, a
public Taiwanese company in the wafer foundry business that became affiliated
with the UMC Group in 1998, pursuant to which we agreed to make a series of
equity investments, totaling approximately $17.5 million, in Utek under specific
terms. In exchange for these investments we received the right to purchase a
percentage of Utek's wafer production.

    On January 3, 2000 UICC and Utek merged into UMC. We own approximately
73 million shares of UMC common stock and have retained our capacity rights. Due
to contractual and regulatory restrictions, the majority of our UMC shares may
not be sold until July 2000. These regulatory restrictions will gradually expire
between July 2000 and January 2004.

AMD

    In June 1999, as part of our acquisition of Vantis, we entered into a series
of agreements with AMD to support the continuing operations of Vantis. AMD has
agreed to provide us with finished silicon wafers through September 2003 in
quantities based either on a rolling six-month or an annual forecast. We have
committed to buy certain minimum quantities of wafers and AMD has committed to
supply certain quantities of wafers during this period. Wafers for our products
are manufactured in the United States at multiple AMD wafer fabrication
facilities. Prices for these wafers will be reviewed and adjusted periodically.

    We have also entered into an agreement with AMD pursuant to which we have
cross-licensed Vantis patents with AMD patents, having an effective filing date
on or before June 15, 1999, related to PLD products. This cross-license was made
on a worldwide, non-exclusive and royalty-free basis.

    As part of our acquisition of Vantis Corporation, we have acquired certain
third-party license rights held by Vantis prior to the acquisition. Included are
rights to use certain Xilinx patents to manufacture, market and sell products.

LEGAL PROCEEDINGS

    In connection with our acquisition of Vantis, we have agreed to assume both
the claims against Altera and the claims by Altera against AMD in the case
captioned ADVANCED MICRO DEVICES, INC. V. ALTERA CORPORATION (CASE
NO. C-94-20567-RMW) proceeding in the United States District Court for the
Northern District of California. This litigation, which began in 1994, involves
multiple claims and counterclaims for patent infringement relating to Vantis and
Altera programmable logic devices and both parties are seeking damages and
injunctive relief.

    In April 1999, the United States Court of Appeals for the Federal Circuit
reversed earlier jury and District Court decisions and held that Altera is not
licensed to the eight AMD patents-in-suit. These eight AMD patents were
subsequently assigned to Vantis. Also in April 1999, following the decision of
the Court of Appeals, Altera filed a petition for rehearing. In June 1999, the
Court of Appeals denied Altera's petition for rehearing.

                                       30
<PAGE>
    On May 31, 2000, Altera Corporation filed a complaint against us in U.S.
District Court in the Northern District of California, alleging infringement of
certain Altera patents by unspecified Lattice products. On June 22, 2000, we
answered Altera's complaint denying any infringement by Lattice, and
simultaneously brought a series of counterclaims alleging infringement by Altera
of certain Lattice patents.

    Although there can be no assurance as to the results of litigation, based
upon information presently known to management, we do not believe that the
ultimate resolution of lawsuits will have a material adverse effect on our
business. The foregoing statement constitutes a forward-looking statement and
the actual results may differ materially depending on a number of factors,
including new court decisions and additional counterclaims made by other parties
to such litigation.

    Except as described above, we are not currently a party to any material
legal proceedings.

                                       31
<PAGE>
                                   MANAGEMENT

    The following table sets forth certain information regarding our executive
officers and directors:

<TABLE>
<CAPTION>
NAME                                       AGE      POSITION
----                                     --------   --------
<S>                                      <C>        <C>
Cyrus Y. Tsui..........................     54      President, Chief Executive Officer and Chairman of
                                                    the Board

Steven A. Laub.........................     41      Senior Vice President and Chief Operating Officer

Stephen A. Skaggs......................     37      Senior Vice President, Chief Financial Officer and
                                                    Secretary

Frank J. Barone........................     60      Corporate Vice President, Product Operations

Stephen M. Donovan.....................     49      Corporate Vice President, Sales

Jonathan K. Yu.........................     59      Corporate Vice President, Business Development

Martin R. Baker........................     44      Vice President and General Counsel

Randy D. Baker.........................     41      Vice President, Manufacturing

Albert L. Chan.........................     51      Vice President and General Manager, Lattice Silicon
                                                    Valley

Thomas J. Kingzett.....................     53      Vice President, Reliability and Quality Assurance

Stanley J. Kopec.......................     49      Vice President, Corporate Marketing

Andrew D. Robin........................     47      Vice President, New Venture Business

Rodney F. Sloss........................     57      Vice President, Finance

James V. Tortolano.....................     50      Vice President and Co-General Counsel

Kenneth K. Yu..........................     52      Vice President and Managing Director, Lattice Asia

Mark O. Hatfield.......................     78      Director

Daniel S. Hauer........................     63      Director

Harry A. Merlo.........................     75      Director

Larry W. Sonsini.......................     59      Director
</TABLE>

    CYRUS Y. TSUI joined Lattice in September 1988 as President, Chief Executive
Officer and Director, and in March 1991 was named Chairman of the Board. From
1987 until he joined, Mr. Tsui was Corporate Vice President and General Manager
of the Programmable Logic Division of AMD. He was Vice President and General
Manager of the Commercial Products Divisions of Monolithic Memories Incorporated
(MMI) from 1983 until its merger with AMD in 1987. Mr. Tsui has held technical
and managerial positions in the semiconductor industry for over 30 years. He has
worked in the programmable logic industry since its inception.

    STEVEN A. LAUB joined Lattice in June 1990 as Vice President and General
Manager. He was elected Senior Vice President and Chief Operating Officer in
August 1996.

    STEPHEN A. SKAGGS joined Lattice in December 1992 as Director, Corporate
Development. He was elected Senior Vice President, Chief Financial Officer and
Secretary in August 1996.

    FRANK J. BARONE joined Lattice in June 1999 as a Corporate Vice President as
a result of the Vantis acquisition. From September 1997 until he joined,
Mr. Barone was Chief Operating Officer of Vantis. Prior thereto, Mr. Barone held
various technical and managerial positions at AMD. He has worked in the
programmable logic industry since 1978.

                                       32
<PAGE>
    STEPHEN M. DONOVAN joined Lattice in October 1989 and has served as Director
of Marketing and Director of International Sales. He was elected Vice President,
International Sales in August 1993. He was elected Corporate Vice President,
Sales, in May 1998. Mr. Donovan has worked in the programmable logic industry
since 1982.

    JONATHAN K. YU joined Lattice in February 1992 as Vice President,
Operations. He was elected Corporate Vice President, Business Development in
August 1996. Mr. Yu has held technical and managerial positions in the
semiconductor industry for over 30 years.

    MARTIN R. BAKER joined Lattice in January 1997 as Vice President and General
Counsel. From 1991 until he joined, Mr. Baker held legal positions with Altera
Corporation.

    RANDY D. BAKER joined Lattice in April 1985 as Manager, Manufacturing and
was promoted in 1988 to Director, Manufacturing. He was elected Vice President,
Manufacturing in August 1996.

    ALBERT L. CHAN joined Lattice in May 1989 as California Design Center
Manager and was promoted in 1991 to Director, California Product Development
Center. He was elected Vice President, California Product Development in
August 1993. He was elected Vice President and General Manager, Lattice Silicon
Valley, in August 1997. Mr. Chan has worked in the programmable logic industry
since 1983.

    THOMAS J. KINGZETT joined Lattice in July 1992 as Director, Reliability and
Quality Assurance. He was elected Vice President, Reliability and Quality
Assurance in May 1998. Mr. Kingzett has worked in the semiconductor industry for
over 25 years.

    STANLEY J. KOPEC joined Lattice in August 1992 as Director, Marketing. He
was elected Vice President, Corporate Marketing in May 1998. Mr. Kopec has
worked in the programmable logic industry since 1985.

    ANDREW D. ROBIN joined Lattice in June 1999 as Vice President, New Venture
Business as a result of the Vantis acquisition. From March 1998 until he joined,
Mr. Robin was Vice President, Marketing at Vantis. Prior thereto, Mr. Robin held
various marketing and managerial positions at AMD and MMI. Mr. Robin has worked
in the programmable logic industry since 1984.

    RODNEY F. SLOSS joined Lattice in May 1994 as Vice President, Finance.

    JAMES V. TORTOLANO joined Lattice in June 1999 as a Vice President as a
result of the Vantis acquisition. From November 1998 until he joined,
Mr. Tortolano was Vice President, General Counsel of Vantis. Prior thereto,
Mr. Tortolano held various legal positions at AMD. He has worked in the
semiconductor industry since 1983.

    KENNETH K YU joined Lattice in January 1991 as Director of Process
Technology. He has served as Managing Director, Lattice Asia since
November 1992 and was elected Vice President, Lattice Asia in August 1993.
Mr. Yu has held technical and managerial positions in the semiconductor industry
for over 25 years.

    MARK O. HATFIELD has been a member of our board of directors since 1997.
Mr. Hatfield is a former U.S. Senator from Oregon.

    DANIEL S. HAUER has been a member of our board of directors since 1987.
Mr. Hauer is the former Chairman and Chief Executive Officer of Epson
Electronics America.

    HARRY A. MERLO has been a member of our board of directors since 1983.
Mr. Merlo is the President of Merlo Corporation and is the former President and
Chairman of Louisiana-Pacific Corporation.

    LARRY W. SONSINI has been a member of our board of directors since 1991.
Mr. Sonsini is Chairman of the Executive Committee of Wilson Sonsini Goodrich &
Rosati, Professional Corporation, a law firm based in Palo Alto, California.

                                       33
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK

    Our authorized capital stock consists of 300,000,000 shares of common stock,
$0.01 par value and 10,000,000 shares of preferred stock, $0.01 par value. As of
June 30, 2000, there were 49,446,405 shares of common stock outstanding 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 our board
of directors out of funds legally available for distribution and in the event of
liquidation, dissolution, or winding up of Lattice, 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 Lattice. There are no redemption or sinking fund
provisions applicable to the common stock. The common stock currently
outstanding is validly issued, fully paid and nonassessable.

CERTAIN CHARTER PROVISIONS

    Our 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 Lattice. These include:

    - a provision classifying the board of directors into three classes; and

    - a provision requiring that the affirmative vote of two-thirds of the
      outstanding voting shares of our capital stock is required to approve
      certain business combinations.

PREFERRED STOCK

    Our board of directors 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
March 31, 2000, there were 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, our board of directors 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 Lattice.

RIGHTS AGREEMENT

    Effective September 1991, our board of directors approved a Preferred Shares
Right Agreement and declared a dividend distribution payable November 14, 1991
of one Preferred Share Purchase Right (called "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-thousandth of
a share of Series A Participating Preferred Stock, $0.01 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 Lattice) on the earlier of (i) ten
(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 our
outstanding common stock or (ii) ten (10) days following the commencement or
announcement of a

                                       34
<PAGE>
tender 24 offer or exchange offer which, if consummated, would result in the
beneficial ownership by a person or group of 20% or more of our outstanding
common stock.

    In general, if any person or group acquires 20% or more of our common stock
without approval of our board of directors, each right not held by the acquiring
person will entitle its holder to purchase $120 worth of our common stock for an
effective purchase price of $60. If, after any person or group acquires 20% or
more of our common stock without the approval of our board of directors, we are
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, we
may elect to redeem the rights for $0.01 per right or cause the exchange of each
right not held by the acquiring person for one share of our common stock.
Additionally, the exercise price, number of rights, and the 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 are designed to protect and maximize the value of the outstanding
equity interests in Lattice in the event of an unsolicited attempt by an
acquiror to take over Lattice 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 expire on September 11,
2001, unless previously exchanged or redeemed as described above, or terminated
in connection with the acquisition of Lattice by consolidation or merger
approved by the board of directors and satisfying certain conditions.

    The rights are not intended to prevent a takeover of Lattice and will not do
so. Nevertheless, the rights may have the effect of rendering more difficult or
discouraging an acquisition of Lattice deemed undesirable by the board of
directors. The rights may cause substantial dilution to a person or group that
attempts to acquire Lattice on terms or in a manner not approved by our board of
directors, except pursuant to an offer conditioned upon the negation, purchase
or redemption of the rights. 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 description above is qualified in its entirety by reference to the
Preferred Shares Right Agreement dated as of September 11, 1991.

DELAWARE TAKEOVER STATUTE

    We are 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:

    - 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;

    - 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

                                       35
<PAGE>
    - 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 25 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 ChaseMellon
Shareholder Services, L.L.C. Its address is 50 California Street, 10th Floor,
San Francisco, California 94111 and its telephone number is (415) 954-9533.

                                       36
<PAGE>
                                  UNDERWRITING

    Lattice and the underwriters for the offering named below have entered into
an underwriting agreement for the shares being offered. Subject to certain
conditions, each underwriter has severally agreed to purchase the number of
shares indicated in the following table. Goldman, Sachs & Co., Morgan Stanley &
Co. Incorporated and Prudential Securities Incorporated are the representatives
of the underwriters.

<TABLE>
<CAPTION>
Underwriters                                                  Number of Shares
------------                                                  ----------------
<S>                                                           <C>
Goldman, Sachs & Co.........................................
Morgan Stanley & Co. Incorporated...........................
Prudential Securities Incorporated..........................
  Total.....................................................     4,000,000
                                                                 =========
</TABLE>

    If the underwriters sell more shares than the total number in the table
above, the underwriters have an option to buy up to an additional 600,000 shares
from Lattice to cover these sales. They may exercise that option for 30 days. If
any shares are purchased under this option, the underwriters will severally
purchase shares in approximately the same proportion as set forth in the table
above.

    The following table shows the per share and total underwriting discounts and
commissions to be paid to the underwriters by Lattice. Such amounts are shown
assuming both no exercise and full exercise of the underwriters' option to
purchase additional shares.

<TABLE>
<CAPTION>
                                                              Paid by Lattice
                                                        ---------------------------
                                                        No Exercise   Full Exercise
                                                        -----------   -------------
<S>                                                     <C>           <C>
Per Share.............................................     $             $
Total.................................................     $             $
</TABLE>

    Shares sold by the underwriters to the public will initially be offered at
the public offering price on the cover of this prospectus. Any shares sold by
the underwriters to securities dealers may be sold at a discount of up to
$      per share from the public offering price. Any of these securities dealers
may resell any shares purchased from the underwriters to other brokers or
dealers at a discount of up to $      per share from the public offering price.
If all the shares are not sold at the offering price, the representatives may
change the offering price and the other selling terms.

    Lattice and its executive officers and directors have agreed with the
underwriters not to dispose of or hedge any of their common stock or any
securities convertible into or exchangeable for shares of common stock during
the period from the date of this prospectus continuing through the date 90 days
after the date of this prospectus without the prior written consent of Goldman,
Sachs & Co. Lattice may, without the prior written consent of Goldman, Sachs &
Co.:

    - issue and sell the shares offered hereby;

    - issue stock upon the exercise of options or warrants or upon conversion or
      exchange of any convertible or exchangeable securities outstanding on the
      date hereof;

    - grant options or issue and sell stock upon the exercise of outstanding
      stock options or otherwise pursuant to Lattice's and Vantis' stock option
      or employee stock purchase plans; and

    - issue, or agree to issue, securities of Lattice as consideration in
      connection with any future acquisitions or strategic investments of
      Lattice or securities of Lattice issuable upon exercise or conversion of
      the foregoing securities.

                                       37
<PAGE>
Lattice's executive officers and directors may, without the prior written
consent of Goldman, Sachs & Co., dispose of or hedge up to 350,000 shares in the
aggregate, but not more than 125,000 shares individually.

    In connection with the offering, the underwriters may purchase and sell
shares of common stock in the open market. These transactions may include short
sales, stabilizing transactions and purchases to cover positions created by
short sales. Short sales involve the sale by the underwriters of a greater
number of shares than they are required to purchase in the offering. Covered
short sales are sales made in an amount not greater than the underwriters'
option to purchase additional shares from Lattice in the offering. The
underwriters may close out any covered short position by either exercising their
option to purchase additional shares or purchasing shares in the open market.
Naked short sales are any sales in excess of the underwriters' option to
purchase additional shares from Lattice. The underwriters must close out any
naked short position by purchasing shares on the open market. A naked short
position is more likely to be created if the underwriters are concerned that
there may be downward pressure on the price of the common stock in the open
market after pricing that could adversely affect investors who purchase in the
offering. Stabilizing transactions consist of various bids for or purchases of
common stock made by the underwriters in the open market prior to the completion
of the offering.

    The underwriters also may impose a penalty bid. This occurs when a
particular underwriter repays to the underwriters a portion of the underwriting
discount received by it because the representatives have repurchased shares sold
by or for the account of such underwriter in stabilizing or short covering
transactions.

    Purchases to cover a short position and stabilizing transactions may have
the effect of preventing or retarding a decline in the market price of Lattice's
stock, and together with the imposition of the penalty bid, may stabilize,
maintain or otherwise affect the market price of the common stock. As a result,
the price of the common stock may be higher than the price that otherwise might
exist in the open market. If these activities are commenced, they may be
discontinued at any time. These transactions may be effected on the Nasdaq
National Market, in the over-the-counter market or otherwise. Also and prior to
the pricing of the shares, and until such time when a stabilizing bid may have
been made, some or all of the underwriters who are market makers in the shares
may make bids for or purchases of shares subject to certain restrictions, known
as passive market making activities.

    Lattice's common stock is quoted on the Nasdaq National Market under the
symbol LSCC.

    A prospectus in electronic format may be made available on the web sites
maintained by one or more underwriters. The underwriters may agree to allocate a
number of shares to underwriters for sale to their online brokerage account
holders. Internet distributions will be allocated by the lead managers to
underwriters that may make Internet distributions on the same basis as other
allocations.

    Lattice estimates that its share of the total expenses of the offering,
excluding underwriting discounts and commissions, will be approximately
$             .

    Lattice has agreed to indemnify the several underwriters against certain
liabilities, including liabilities under the Securities Act of 1933.

                                       38
<PAGE>
                            VALIDITY OF COMMON STOCK

    The validity of the issuance of the common stock in this offering will be
passed upon for us by Wilson Sonsini Goodrich & Rosati, Professional
Corporation, Palo Alto, California, and for the underwriters by Davis Polk &
Wardwell, Menlo Park, California. Larry W. Sonsini, one of our directors and a
partner of Wilson Sonsini Goodrich & Rosati, beneficially owned 31,680 shares of
our common stock at June 30, 2000, including 27,000 shares subject to options
exercisable within 60 days of that date.

                                    EXPERTS

    The consolidated financial statements incorporated in this prospectus by
reference to the Annual Report on Form 10-K for the transition period ended
December 31, 1999 have been so incorporated in reliance on the report of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
said firm as experts in auditing and accounting. The consolidated financial
statements of Vantis Corporation as of December 27, 1998 and December 28, 1997,
and for the three years in the period ended December 27, 1998, appearing in our
current report on Form 8-K filed on June 25, 1999, amended on August 20, 1999
(Form 8-K/A), have been so incorporated in reliance on the report of Ernst &
Young LLP, Independent Auditors, given on the authority of said firm as experts
in accounting and auditing.

                   WHERE YOU MAY FIND ADDITIONAL INFORMATION

    We file reports, proxy statements and other information with the Securities
and Exchange Commission, or SEC, as required by the Securities Exchange Act of
1934. You may read and copy the reports, proxy statements and other information
filed by us at the SEC's public reference room at 450 Fifth Street, N.W.,
Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for information on
the operation of the public reference room.

    The SEC allows us to incorporate by reference into this prospectus
information that we have filed with the SEC. This means that we can disclose
important information by referring you to those documents. The information
incorporated by reference is considered to be a part of this prospectus.
Information that we file later with the SEC will automatically update and
supersede previously filed information. We incorporate by reference the
documents listed below and any future filings made by us with the SEC under
Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 until
our offering is complete:

    - Our annual report on Form 10-K, as amended, for the transition period
      beginning April 4, 1999 and ending January 1, 2000, filed on March 30,
      2000;

    - Our quarterly report on Form 10-Q for the quarter ended April 1, 2000,
      filed on May 15, 2000;

    - Our current report on Form 8-K filed on June 25, 1999, and amended on
      August 20, 1999;

    - Our current report on Form 8-K filed on July 11, 2000.

    - The description of our common stock contained in our registration
      statement on Form 8-A, filed on September 27, 1989, including any
      amendments or reports filed for the purpose of updating such description;
      and

    - All of our filings pursuant to the Securities Exchange Act of 1934 made
      after the date of the original filing of the registration statement of
      which this prospectus is a part and prior to the effectiveness of the
      registration statement.

    You may request a copy of these filings, at no cost, by writing or
telephoning us at the following address: Investor Relations Department, Lattice
Semiconductor Corporation, 5555 N.E. Moore Court, Hillsboro, Oregon 97124-6421,
telephone: (503) 268-8000.

                                       39
<PAGE>
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

    No dealer, salesperson or other person is authorized to give any information
or to represent anything not contained in this prospectus. You must not rely on
any unauthorized information or representations. This prospectus is an offer to
sell only the shares offered hereby, but only under circumstances and in
jurisdictions where it is lawful to do so. The information contained in this
prospectus is current only as of its date.

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

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                          Page
                                        --------
<S>                                     <C>
Prospectus Summary....................      3
Risk Factors..........................      7
You Should Not Rely on Forward-Looking
  Statements Because They Are
  Inherently Uncertain................     12
Use of Proceeds.......................     13
Common Stock Price Range..............     13
Dividend Policy.......................     13
Capitalization........................     14
Selected Consolidated Financial
  Data................................     15
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.......................     17
Business..............................     24
Management............................     32
Description of Capital Stock..........     34
Underwriting..........................     37
Validity of Common Stock..............     39
Experts...............................     39
Where You May Find Additional
  Information.........................     39
</TABLE>

                                4,000,000 Shares

                       LATTICE SEMICONDUCTOR CORPORATION

                                  Common Stock

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

                                     [LOGO]

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

                           JOINT BOOKRUNNING MANAGERS

                              GOLDMAN, SACHS & CO.

                           MORGAN STANLEY DEAN WITTER

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

                          PRUDENTIAL VOLPE TECHNOLOGY
                        A UNIT OF PRUDENTIAL SECURITIES

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
<PAGE>
                                    PART II
                   INFORMATION NOT REQUIRED IN THE PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

    The following table sets forth the costs and expenses, other than
underwriting discounts and commissions, payable by us in connection with the
sale of common stock being registered. All amounts are estimates except the
Securities and Exchange Commission registration fee and the Nasdaq National
Market listing fee.

<TABLE>
<S>                                                           <C>
Securities and Exchange Commission registration fee.........   $
Nasdaq National Market listing fee..........................
Printing and engraving costs................................
Legal fees and expenses.....................................
Accounting fees and expenses................................
Blue Sky fees and expenses..................................
Transfer Agent and Registrar fees...........................
Miscellaneous expenses......................................
                                                               ------
  Total.....................................................   $
                                                               ======
</TABLE>

ITEM 15.  INDEMNIFICATION OF OUR DIRECTORS AND OFFICERS

CERTIFICATE OF INCORPORATION

    Article VI of our certificate of incorporation provides that, to the fullest
extent permitted by Delaware law, as the same now exists or may hereafter be
amended, a director shall not be personally liable to the corporation or its
stockholders for monetary damages arising out of his conduct as a director.
Delaware law provides that directors of a corporation will not be personally
liable for monetary damages for breach of their fiduciary duties as directors,
except for liability:

    - for any breach of their duty of loyalty to the corporation or its
      stockholders,

    - for acts or omissions not in good faith or that involve intentional
      misconduct or a knowing violation of law,

    - for unlawful payments of dividends or unlawful stock repurchases or
      redemptions as provided in Section 174 of the Delaware General Corporation
      Law, or

    - for any transaction from which the director derived an improper personal
      benefit.

BYLAWS

    Our bylaws provide that our directors, officers and agents shall be
indemnified against expenses including attorneys' fees, judgments, fines,
settlements actually and reasonably incurred in connection with any proceeding
arising out of their status as our agent. Our bylaws also allow us to purchase
and maintain insurance on behalf of any person who is or was one of our
directors, officers, employees or agents, against any liability arising out of
the person's status as such, whether or not we would have the power to indemnify
the person under Delaware law.

                                      II-1
<PAGE>
ITEM 16.  EXHIBITS

    The following exhibits are filed herewith or incorporated by reference
herein:

<TABLE>
<CAPTION>
       EXHIBIT
       NUMBER                                  EXHIBIT TITLE
---------------------                          -------------
<S>                     <C>
 1.1*                   Underwriting Agreement
 3.1                    The Company's Certificate of Incorporation, as amended.
 5.1*                   Opinion of Wilson Sonsini Goodrich & Rosati, Professional
                        Corporation.
 23.1                   Consent of PricewaterhouseCoopers LLP, independent
                        accountants.
 23.2                   Consent of Ernst & Young LLP, Independent Auditors.
 23.3*                  Consent of Wilson Sonsini Goodrich & Rosati, Professional
                        Corporation (included in Exhibit 5.1).
 24.1                   Power of Attorney (see page II-3 of this Form S-3).
</TABLE>

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

*   To be filed by amendment.

ITEM 17.  UNDERTAKINGS

    Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the provisions described under Item 15 above, or
otherwise, the registrant has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable. In the event
that a claim for indemnification against such liabilities, other than the
payment by the Registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant in the successful defense of any action,
suit or proceeding, is asserted by such director, officer or controlling person
in connection with the securities being registered, the registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.

    The undersigned Registrant hereby undertakes:

    (1) That, for purposes of determining any liability under the Securities Act
       of 1933, each filing of the registrant's annual report pursuant to
       Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934
       that is incorporated by reference in this 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.

    (2) For purposes of determining any liability under the Securities Act of
       1933, 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.

    (3) For the purpose of determining any liability under the Securities Act of
       1933, 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.

                                      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 registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Hillsboro, State of Oregon, on July 11, 2000.

<TABLE>
<S>                                                    <C>  <C>
                                                       LATTICE SEMICONDUCTOR CORPORATION

                                                       By:                 /s/ CYRUS Y. TSUI
                                                            ----------------------------------------------
                                                                          Name: Cyrus Y. Tsui
                                                            Title:  PRESIDENT, CHIEF EXECUTIVE OFFICER AND
                                                                         CHAIRMAN OF THE BOARD
</TABLE>

                               POWER OF ATTORNEY

    KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below hereby constitutes and appoints Cyrus Y. Tsui and Stephen A. Skaggs, and
each of them acting individually, as his attorneys-in-fact and agents, each with
full power of substitution, for him in any and all capacities, to sign any and
all amendments to this Registration Statement on Form S-3 including
post-effective amendments or any abbreviated registration statement and any
amendments thereto filed pursuant to Rule 462(b) increasing the number of
securities for which registration is sought, and to file the same, with all
exhibits thereto and all other documents in connection therewith, with the
Securities and Exchange Commission, granting unto such attorneys-in-fact and
agents, with full power of each to act alone, full power and authority to do and
perform each and every act and thing required and necessary to be done in
connection therewith, as fully for all intents and purposes as he might or could
do in person, hereby ratifying and confirming all that such attorneys-in-fact
and agents or any of them, or his or their substitute or substitutes, may
lawfully do or cause to be done by virtue hereof.

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

<TABLE>
<CAPTION>
                        NAME                                           TITLE                        DATE
                        ----                                           -----                        ----
<C>                                                    <S>                                    <C>
                  /s/ CYRUS Y. TSUI                    President, Chief Executive Officer       July 11, 2000
     -------------------------------------------         (Principal Executive Officer) and
                    Cyrus Y. Tsui                        Chairman of the Board of Directors

                /s/ STEPHEN A. SKAGGS                  Senior Vice President, Chief             July 11, 2000
     -------------------------------------------         Financial Officer (Principal
                  Stephen A. Skaggs                      Financial and Accounting Officer)
                                                         and Secretary

                /s/ MARK O. HATFIELD                   Director                                 July 11, 2000
     -------------------------------------------
                  Mark O. Hatfield

                 /s/ DANIEL S. HAUER                   Director                                 July 11, 2000
     -------------------------------------------
                   Daniel S. Hauer

                 /s/ HARRY A. MERLO                    Director                                 July 11, 2000
     -------------------------------------------
                   Harry A. Merlo

                /s/ LARRY W. SONSINI                   Director                                 July 11, 2000
     -------------------------------------------
                  Larry W. Sonsini
</TABLE>

                                      II-3
<PAGE>
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
EXHIBIT
NUMBER                                         EXHIBIT TITLE
-------                                        -------------
<S>                     <C>
 1.1*                   Underwriting Agreement

 3.1                    The Company's Certificate of Incorporation, as amended.

 5.1*                   Opinion of Wilson Sonsini Goodrich & Rosati, Professional
                        Corporation.

 23.1                   Consent of PricewaterhouseCoopers LLP, independent
                        accountants.

 23.2                   Consent of Ernst & Young LLP, Independent Auditors.

 23.3*                  Consent of Wilson Sonsini Goodrich & Rosati, Professional
                        Corporation (included in Exhibit 5.1).

 24.1                   Power of Attorney (see page II-3 of this Form S-3).
</TABLE>

*   To be filed by amendment.


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