M93S66, M93S56 M93S46 4Kbit, 2Kbit and 1Kbit (16-b.
M93S56 - 4Kbit / 2Kbit and 1Kbit 16-bit wide MICROWIRE Serial Access EEPROM with Block Protection
M93S56-125 - MICROWIRE serial EEPROM
M93S56-W - MICROWIRE bus EEPROM