DESCRIPTION
The M28256 and M28256-W devices consist of 32K x 8 bits of low power, parallel EEPROM, fabricated with STMicroelectronics’ proprietary double polysilicon CMOS technology. The devices offer fast access time, with low power dissipation, and require a single voltage supply (5V or 3V, depending on the option chosen).

■ Fast Access Time:
   – 90 ns at VCC=5 V for M28256
   – 120 ns at VCC=3 V for M28256-W
■ Single Supply Voltage:
   – 4.5 V to 5.5 V for M28256
   – 2.7 V to 3.6 V for M28256-W
■ Low Power Consumption
■ Fast BYTE and PAGE WRITE (up to 64 Bytes)
   – 3 ms at VCC=4.5 V for M28256
   – 5 ms at VCC=2.7 V for M28256-W
■ Enhanced Write Detection and Monitoring:
   – Data Polling
   – Toggle Bit
   – Page Load Timer Status
■ JEDEC Approved Bytewide Pin-Out
■ Software Data Protection
■ 100,000 Erase/Write Cycles (minimum)
■ 10 Year Data Retention (minimum)