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BUY AT28HC256-12DM/883 https://www.utsource.net/itm/p/429799.html
256 32K x 8 High Speed Parallel EEPROMs
Description: The AT28HC256-12DM/883 is a 28-pin CMOS static RAM device manufactured by Microchip Technology. It is a low-power, high-speed, non-volatile memory device with an access time of 12ns. Features: 256K x 8-bit non-volatile static RAM Low power consumption High speed access time of 12ns Low voltage operation Single +5V power supply On-chip write protection 28-pin DIP package Applications: Automotive Industrial Medical Security Telecommunications Consumer electronics (For reference only)