BUY UPD43256BGU-70LL https://www.utsource.net/itm/p/501070.html
256K-BIT CMOS STATIC RAM 32K-WORD BY 8-BIT
Description: 32K x 8 CMOS Static RAM Features: - Low power consumption - High speed access time - Wide operating temperature range - Single 5V power supply - Low standby current - TTL compatible inputs and outputs - Automatic power down - Easy memory expansion - High reliability Applications: - Automotive systems - Industrial control systems - Instrumentation systems - Data acquisition systems - Telecommunications systems - Embedded systems - Robotics systems - Medical systems - Security systems (For reference only)