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, Steve Sanghi, 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 Microchip Technology Incorporated on Form 10-Q for the quarterly
period ended December 31, 2002 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 Form 10-Q fairly presents, in all material respects, the
financial condition and results of operations of Microchip Technology
Incorporated.

                                        By: /s/ Steve Sanghi
                                            ------------------------------------
                                            Name:  Steve Sanghi
                                            Title: President and Chief Executive
                                                   Officer
                                            Date:  February 7, 2003

I, Gordon W. Parnell, 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 Microchip Technology Incorporated on Form 10-Q for the quarterly
period ended December 31, 2002 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 Form 10-Q fairly presents, in all material respects, the
financial condition and results of operations of Microchip Technology
Incorporated.

                                        By: /s/ Gordon W. Parnell
                                            ------------------------------------
                                            Name:  Gordon W. Parnell
                                            Title: Vice President and Chief
                                                   Financial Officer
                                            Date:  February 7, 2003