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