256K (32K x 8)
5-volt only
Flash Memory
AT29C256

Features:
Fast Read Access Time: -90 ns
5-volt only Reprogramming

Page Program Operation:
-Single Cycle Reprogram (Erase and Program)
-Internal Address and Data Latches for 64 Bytes

Internal Program Control and Timer
Hardware and Software Data Protection
Fast Program Cycle Times:
-Page (64 Byte) Program Time -10 ms
-Chip Erase Time -10 ms

DATA Polling for End of Program Detection
Low-power Dissipation:
-50 mA Active Current
-300 A CMOS Standby Current

Typical Endurance: > 10, 000 Cycles
Single 5V +-10% Supply
CMOS and TTL Compatible Inputs and Outputs
Commercial and Industrial Temperature Ranges

Description:
The AT29C256 is a five-volt-only in-system Flash programmable and erasable read
only memory (PEROM). Its 256K of memory is organized as 32, 768 words by 8 bits.
Manufactured with Atmel's advanced nonvolatile CMOS technology, the device offers access times to 70 ns with power dissipation of just 275 mW. When the device is deselected, the CMOS standby current is less than 300. The device endurance is such that any sector can typically be written to in excess of 10, 000 times.