Exhibit 99.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL
OFFICER
PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Cyrus Y. Tsui, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of Lattice Semiconductor Corporation on Form 10-Q for the quarter ended March 31, 2003 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarterly Report fairly presents, in all material respects, the financial condition and results of operations of Lattice Semiconductor Corporation.

By:	/s/ Cyrus Y.Tsui
Name:		Cyrus Y. Tsui
Title:		Chief Executive Officer

I, Stephen A. Skaggs, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of Lattice Semiconductor Corporation on Form 10-Q for the quarter ended March 31, 2003 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Quarterly Report fairly presents, in all material respects, the financial condition and results of operations of Lattice Semiconductor Corporation.

By:	/s/ Stephen A. Skaggs
Name:		Stephen A. Skaggs
Title:		Chief Financial Officer