DESCRIPTION
The CAT28C256 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 CAT28C256 features hardware and software write protection.

FEATURES
■ Fast Read Access Times: 120/150ns
■ Low Power CMOS Dissipation:
–Active: 25 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:
–5ms Max
■ CMOS and TTL Compatible I/O
■ Hardware and Software Write Protection
■ Automatic Page Write Operation:
–1 to 64 Bytes in 5ms
–Page Load Timer
■ End of Write Detection:
–Toggle Bit
–DATA Polling
■ 100,000 Program/Erase Cycles
■ 100 Year Data Retention
■ Commerical, Industrial and Automotive Temperature Ranges