BUY D28C64ACZ-20 https://www.utsource.net/itm/p/1158581.html

Description: The D28C64ACZ-20 is a 64K CMOS static RAM manufactured by NEC. It is a 28-pin DIP (dual in-line package) device. Features: Low power consumption Fast access time: 20 ns High speed data transfer rate Low voltage operation: 2.7V to 5.5V TTL compatible inputs and outputs Data retention voltage: 1.5V Automatic power down Applications: The D28C64ACZ-20 is suitable for use in a variety of applications, including: Automotive Industrial Telecommunications Embedded systems Consumer electronics Medical equipment Networking systems (For reference only)