Lattice Semiconductor Schedules Conference Call and Announces Investor Conference Schedule

HILLSBORO, Ore. - April 19, 2004 - Lattice Semiconductor Corporation (NASDAQ: LSCC) announces that a telephone conference call with financial analysts to discuss first quarter 2004 financial results is scheduled for 5:30 am (Pacific Time) on Friday, April 23rd, 2004. Investors may listen live to our conference call via the web at www.lscc.com and the call will be archived there for replay until our next earnings conference call for the June 30, 2004 ending quarter. We will release earnings before the market opens on Friday, April 23, 2004.

We will make a presentation at the JP Morgan Technology and Telecom Conference at the Westin St. Francis Hotel in San Francisco on Monday, May 3rd, 2004 at 1:30 pm Pacific time. Investors may listen to the presentation live via the at www.lscc.com and the call will be archived there for replay until our next earnings conference call for the June 30, 2004.

We will also make a presentation during the Smith Barney Citigroup semiconductor conference at the Monterey Plaza Hotel in Monterey, California on June 2nd and 3rd, 2004. Details will be posted on our website at www.lscc.com.

Lattice Semiconductor Corporation, the inventor of in-system programmable^TM (ISP^TM) logic products, designs, develops and markets the broadest range of Field Programmable Gate Arrays (FPGA), Field Programmable System Chips (FPSC) and high-performance ISP Programmable Logic Devices (PLD), including Complex Programmable Logic Devices (CPLD), Programmable Analog Chips (PAC), and Programmable Digital Interconnect (GDX). Lattice also offers industry leading SERDES products. Lattice provides total solutions for today's system designs by delivering innovative programmable silicon products that embody leading-edge system expertise.

Lattice products are sold worldwide through an extensive network of independent sales representatives and distributors, primarily to OEM customers in the communications, computing, industrial and military end markets. Company headquarters are located at 5555 N.E. Moore Court, Hillsboro, Oregon 97124 USA. For more information access our web site at http://www.latticesemi.com.

Lattice Semiconductor Corporation, L (& design), Lattice (& design), in-system programmable, ISP and specific product designations are either registered trademarks or trademarks of Lattice Semiconductor Corporation or its subsidiaries in the United States and/or other countries.

For more information contact:

Roddy Sloss

Vice President, Finance
Lattice Semiconductor Corporation
(503) 268-8000