BUY W9812G6JH-6 https://www.utsource.net/itm/p/11247204.html

Description: The W9812G6JH-6 is a 512K x 8-bit CMOS Static RAM manufactured by Winbond. Features: Low power consumption High speed access time: 70ns Single +5V power supply TTL compatible inputs and outputs Fully static operation Automatic power-down when deselected CMOS power levels Data retention during power-down Output enable control Package: TSOP-54 Applications: The W9812G6JH-6 is suitable for use in applications such as memory expansion, data buffering, and cache memory. It is also suitable for use in embedded systems, industrial control, and consumer electronics. (For reference only)