TOSHIBA 1l:55B4257J-12/15/20 SILICON GATE BiCMOS.
TC55B4257J-15 - 256K x 4-Bit BiCMOS Static RAM
TC55B4257J - 256K x 4-Bit BiCMOS Static RAM
TC55B4257J-12 - 256K x 4-Bit BiCMOS Static RAM
TC55B4257J-20 - 256K x 4-Bit BiCMOS Static RAM
