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BUY DP8421AV-20 https://www.utsource.net/itm/p/1893201.html
DP8421A - Microcmos Programmable 1M Dynamic RAM Controller/Driver(s), Package: Plcc, Pin Nb=68
Description: The DP8421AV-20 is a high-performance, low-power, CMOS static RAM integrated circuit. It is designed to provide a low-cost, high-speed, non-volatile memory solution for a variety of applications. Features: Low power consumption High speed access time Non-volatile memory Low cost CMOS static RAM 68-pin PLCC package Application: The DP8421AV-20 is suitable for use in a variety of applications, including embedded systems, industrial control, consumer electronics, and automotive applications. It can be used to store and retrieve data quickly and reliably. (For reference only)