ST M28C64 handbook
Datasheet
M28C64 is a 64Kbit (8K x 8) parallel EEPROM with software data protection. Its features are fast access time, single supply voltage, low power consumption, fast byte and page write, enhanced write detection and monitoring, JEDEC approved bytewide pin-out, software data protection, 100000 erase/write cycles (minimum) and data retention (minimum): 40 years for M28C64 and M28C64-xxW, 10 years for M28C64-A.
