BUY D421000C-10 https://www.utsource.net/itm/p/389952.html

Description: D421000C-10 is a 4-bit CMOS static RAM integrated circuit manufactured by NEC. Features: * Low power consumption * High speed operation * High noise immunity * Low standby current * High reliability Applications: D421000C-10 is used in various applications such as data storage, memory expansion, and data processing. It is also used in embedded systems, industrial automation, medical equipment, and automotive applications. (For reference only)