DESCRIPTION
The CAT28HT256 is a fast, low power, 5V-only CMOS parallel E2PROM organized as 32K x 8-bits. It requires a simple interface for in-system programming. On-chip address and data latches, self-timed write cycle with auto-clear and VCC power up/down write protection eliminate additional timing and protection hardware. DATA Polling and Toggle status bits signal the start and end of the self-timed write cycle. Additionally, the CAT28HT256 features hardware and software write protection as well as an internal Error Correction Code (ECC) for extremely high reliability.

FEATURES
■ Fast Read Access Times: 200/250 ns
■ Low Power CMOS Dissipation:
    –Active: 30 mA Max.
    –Standby: 150 µA Max.
■ Simple Write Operation:
    –On-Chip Address and Data Latches
    –Self-Timed Write Cycle with Auto-Clear
■ Fast Write Cycle Time:
    –10ms Max
■ CMOS and TTL Compatible I/O
■ Automatic Page Write Operation:
    –1 to 64 Bytes in 10ms
    –Page Load Timer
■ End of Write Detection:
    –Toggle Bit
    –DATA Polling
■ Hardware and Software Write Protection
■ 100,000 Program/Erase Cycles
■ 100 Year Data Retention