X28C64P25 

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5 Volt , Byte Alterable E2PROM , 8K x 8 Bit

The X28C64 is an 8K x 8 E PROM, fabricated with Xicor’ s proprietary, high performance, floating gate CMOS technology. Like all Xicor programmable nonvolatile memories the X28C64 is a 5V only device. The X28C64 features the JEDEC approved pinout for byte-wide memories, compatible with industry standard RAMs.

Dokumentacja: http://www.wolumen53.com/pdf/X28C64P25-xicor.pdf