BUY MM2114N https://www.utsource.net/itm/p/642397.html
1024-bit (256 x 4) static MOS RAM with common I/O and output disable
The MM2114N is a 4K-bit static random access memory (SRAM) manufactured by National Semiconductor. It is a 18-pin dual in-line package (DIP) device. Description: The MM2114N is a 4K-bit static random access memory (SRAM) organized as 512 words by 8 bits. It has an asynchronous address and data bus, and is accessed like a static RAM. Features: 4K-bit static RAM Low power consumption Fast access time Low standby current TTL compatible Applications: Automotive Industrial Avionics Telecommunications Instrumentation Robotics (For reference only)