EEPROM, 256 Kb (32 K x 8), 5 V, 150ns, PDIP-28

5V 256Kbit (32Kbit x 8) Parallel EEPROM with Software Data Protection

Description:
The Microchip AT28C256 is a high-performance 256Kbit Parallel EEPROM available in both Industrial and Military temp ranges, offering access times to 150ns with power dissipation of 440mW. Deselected, CMOS standby current is less than 200µA. Accessed like static RAM for the read or write cycle without external components, it contains a 64-byte page register to allow writing of up to 64bytes simultaneously. Features an internal Error Correction Circuit for extended endurance and improved data retention, in Military version. Optional Software Data Protection mechanism guards against inadvertent writes; and an extra 64 bytes of EEPROM enables device identification or tracking.

Features:
- Fast Read Access Time: 150 ns
- Automatic Page Write Operation:
- Internally organized as 32,768 x 8 (256K)
- Internal address and data latches for 64 bytes
- Internal control timer
- Fast Write Cycle Time:
- Page Write cycle time: 3 ms or 10 ms maximum
- 1 to 64-byte Page Write operation
- Low-Power Dissipation:
- 50 mA active current
- 200 µA CMOS standby current
- Hardware and Software Data Protection
- DATA Polling for End of Write Detection
- High Reliability CMOS Technology:
- Endurance: 10,000 or 100,000 cycles
- Data retention: 10 years
- Single 5V ± 10% Supply
- CMOS and TTL Compatible Inputs and Outputs
- JEDEC® Approved Byte-Wide Pinout
- Industrial Temperature Range