<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>
McMahan Securities Company, L.P. $1,000,000 * 24,131 *
BNP Arbitrage SNC $2,000,000 * 48,262 *
Boulder Capital Inc. $4,100,000 1.6% 98,938 *
ONEX Industrial Partners Limited $2,650,000 1.0% 63,947 *
Boulder II Limited $6,900,000 2.7% 166,505 *
Pebble Capital Inc. $850,000 * 20,511 *
Quattro Fund LTD $1,000,000 * 24,131 *
Ramius Securities, LLC $1,500,000 * 36,196 *
- -------------------------
</TABLE>
*Less than 1%
(1) Assumes conversion of the full amount of notes held by such holder at the
initial conversion price of $41.440 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 47,926,112 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.
----------------
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 COM-
MISSION PASSED UPON THE ACCURACY OR ADEQUACY OF
THIS PROSPECTUS. ANY REPRESENTATION TO THE
CONTRARY IS A CRIMINAL OFFENSE.
----------------
The date of this Prospectus Supplement is February 23, 2000.
