The AT28C256F-20DC is a 256K (32K x 8) Parallel EEPROM device with a 200ns access time. It offers a high-speed performance, making it suitable for a wide range of applications including data storage, program memory, and configuration storage. The device operates on a single 5V power supply and has a low power consumption, making it ideal for battery-powered devices. The AT28C256F-20DC features a byte write and a word write capability, allowing for flexible data storage options. It also offers a software data protection feature to prevent inadvertent writes to the memory. The device is available in a 28-pin DIP package, which makes it easy to integrate into existing or new designs. With its high-speed performance, low power consumption, and versatile data storage options, the AT28C256F-20DC is a reliable and efficient solution for various memory storage requirements in electronic systems.