Description
The AT28C040 is a high-performance electrically erasable and programmable read-only memory (EEPROM). Its 4 megabits of memory is organized as 524,288 words by 8 bits. Manufactured with Atmel’s advanced nonvolatile CMOS technology, the device offers access times to 200 ns with power dissipation of just 440 mW.

FEATUREs
• Read Access Time – 200 ns
• Automatic Page Write Operation
    – Internal Address and Data Latches for 256 Bytes
    – Internal Control Timer
• Fast Write Cycle Time
    – Page Write Cycle Time – 10 ms Maximum
    – 1 to 256 Byte Page Write Operation
• Low Power Dissipation
    – 50 mA Active Current
• Hardware and Software Data Protection
• DATA Polling for End of Write Detection
• High Reliability CMOS Technology
    – Endurance: 10,000 Cycles
    – Data Retention: 10 Years
• Single 5V ± 10% Supply
• CMOS and TTL Compatible Inputs and Outputs
• JEDEC Approved Byte-Wide Pinout