The X28C256 is an 32K x 8 E2PROM, fabricated with Xicor’s proprietary, high performance, floating gate CMOS technology. Like all Xicor programmable non- volatile memories the X28C256 is a 5V only device. The X28C256 features the JEDEC approved pinout for byte- wide memories, compatible with industry standard RAMs.
The X28C256 supports a 64-byte page write operation, effectively providing a 78 s/byte write cycle and en- abling the entire memory to be typically written in less than 2.5 seconds. The X28C256 also features DATA and Toggle Bit Polling, a system software support scheme used to indicate the early completion of a write cycle. In addition, the X28C256 includes a user-optional software data protection mode that further enhances Xicor’s hardware write protect capability.
Xicor E2PROMs are designed and tested for applications requiring extended endurance. Inherent data re- tention is greater than 100 years.
FEATURES
• Access Time: 150ns
• Simple Byte and Page Write
— Single 5V Supply
— No External High Voltages or VPP Control Circuits
— Self-Timed
— No Erase Before Write
— No Complex Programming Algorithms
— No Overerase Problem
• Low Power CMOS:
— Active: 60mA
— Standby: 200 A
• Software Data Protection
— Protects Data Against System Level Inadvertent Writes
• High Speed Page Write Capability
• Highly Reliable Direct Write™ Cell
— Endurance: 100,000 Write Cycles
— Data Retention: 100 Years
• Early End of Write Detection
— DATA Polling
— Toggle Bit Polling
