BUY IS62C256-70U https://www.utsource.net/itm/p/11192194.html
IC SRAM 256K PARALLEL 28SOP
Description: IS62C256-70U is a 32K x 8 static CMOS RAM manufactured by ISSI. Features: Low power CMOS technology Fast access time: 70ns Single 5V ± 10% power supply TTL compatible inputs and outputs High speed CMOS page mode operation Automatic power down when deselected Low standby current Fully static operation Pin and function compatible with 6116 Applications: Automotive Industrial Instrumentation Military Telecommunications Computer peripherals Networking Medical (For reference only)