AT28C256-15PU – ATMEL

The AT28C256-15PU is a 256-kilobit (32,768 x 8) parallel EEPROM IC fabricated by Atmel, packaged in a 28-pin plastic DIP (Dual In-Line Package). This device features asynchronous read and write operations accessed via a parallel address and data bus. The -15 suffix denotes a maximum access time of 150 nanoseconds, specifying the delay from a valid address to valid data output. It requires a single 5V power supply for operation and incorporates on-chip address and data latches to simplify microprocessor interfacing. The AT28C256-15PU utilizes a page write mode, allowing for the programming of up to 64 bytes simultaneously, thereby reducing overall write time. Endurance is specified at a minimum of 10,000 write cycles per byte, with data retention guaranteed for a minimum of 10 years. The device incorporates a hardware data protection scheme to prevent inadvertent writes during power-up or power-down.