August 1, 2002 Dear Customer: Aeroflex UTMC Microelectronic Systems Inc. (UTMC) appreciates your interest and use of our products, specifically the RadHard Family of PROMs. The purpose of this letter is to inform you that UTMC is migrating the 256K RadHard PROM, both 3 and 5 volt versions (Standard Microcircuit Drawings 5962-96891 and 5962-01517), to a new wafer fabrication facility. Production devices from the new facility will begin shipping late in the third quarter of 2003 (i.e., September 2003). The new 256K PROM products are designed to be a direct replacement to the existing products currently in QML Q and V production. As a result of the wafer foundry and process change (1.5µm to 0.35µm CMOS), differences in AC electrical performance were unavoidable. UTMC will keep you apprised of performance differences as they are identified via written notification and the web-site (www.utmc.com). UTMC will continue to offer RadHard 256K PROM in a 28-lead flatpack (FP); however, due to the lack of demand, UTMC has chosen not to re-tool the 36-pin DIP package for the PROM. UTMC has sufficient die inventory to yield approximately 800 to 1000 finished good units. The inventory of the existing 256K PROM is being offered to customers on a “first come, first serve” basis. All purchase orders will require delivery within 24 weeks of receipt and acceptance of purchase order. Additionally, UTMC will decline all requests for single lot date code shipments until the foundry migration is complete. UTMC plans to cease shipping product built from the old mask set once qualification of the migrated version is complete. We expect to use the same SMD number (5962-96891 and 5962-01517) with new device types. If you have any questions please contact me at (719) 594-8252 or [email protected] Regards, Anthony F. Jordan Director of Standard Products Aeroflex UTMC Microelectronic Systems Inc.