<PAGE>
PROSPECTUS SUPPLEMENT FILED PURSUANT TO RULE 424(b)(4)
TO PROSPECTUS DATED FEBRUARY 8, 2000 REGISTRATION NO. 333-93285
$260,000,000
LATTICE SEMICONDUCTOR CORPORATION
4 3/4% CONVERTIBLE SUBORDINATED NOTES DUE 2006
AND SHARES OF COMMON STOCK
This prospectus supplement relates to the resale by the selling
securityholders of 4 3/4% convertible subordinated notes due 2006 of Lattice
Semiconductor Corporation and the shares of common stock, par value of $0.01
per share, of Lattice Semiconductor Corporation issuable upon the conversion
of the notes.
This prospectus supplement should be read in conjunction with the
prospectus dated February 8, 2000, which is to be delivered with this
prospectus supplement. All capitalized terms used but not defined in the
prospectus supplement shall have the meanings given them in the prospectus.
The table below sets forth information as of the date hereof concerning
beneficial ownership of the notes of the selling securityholders as listed
below. All information concerning beneficial ownership has been furnished by
the selling securityholders.
<TABLE>
<CAPTION>
PRINCIPAL NUMBER OF
AMOUNT OF NOTES SHARES OF
BENEFICIALLY PERCENTAGE OF COMMON STOCK PERCENTAGE OF
OWNED THAT NOTES THAT MAY BE COMMON STOCK
NAME MAY BE SOLD OUTSTANDING SOLD (1)** OUTSTANDING (2)
--------- --------------- ------------- ------------ ---------------
<S> <C> <C> <C> <C>
AmSouth Bank, Custodian for Variable Equity
Income Fund $50,000 * 2,413 *
</TABLE>
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(1) Assumes conversion of the full amount of notes held by such holder at the
initial conversion price of $20.720 per share; such conversion price is
subject to adjustment as described under "Description of Notes --
Conversion of Notes." Accordingly, the number of shares of common stock
issuable upon conversion of the Notes may increase or decrease from time to
time. Under the terms of the Indenture, fractional shares will not be
issued upon conversion of the notes; cash will be paid in lieu of
fractional shares, if any.
(2) Computed in accordance with Rule 13d-3(d)(i) promulgated under the Exchange
Act and based upon 95,852,224** shares of common stock outstanding as of
October 2, 1999, treating as outstanding the number of shares of common
stock shown as being issuable upon the assumed conversion by the named
holder of the full amount of such holder's notes but not assuming the
conversion of the notes of any other holder.
*Less than 1%
**As adjusted for the 2 for 1 split in the form of a stock dividend of our
common stock on October 11, 2000.
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THE SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK. SEE "RISK
FACTORS" BEGINNING ON PAGE 6 OF THE PROSPECTUS.
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
SECURITIES AND EXCHANGE COMMISSION NOR HAS THE SECURITIES AND EXCHANGE
COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR
ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
OFFENSE.
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The date of this Prospectus Supplement is October 19, 2000
