BUY DS14285S+ https://www.utsource.net/itm/p/8974689.html
IC RTC CLK/CALENDAR PAR 24-SOIC
Description: The DS14285S+ is a low-power, 8-bit CMOS static RAM designed for use in a variety of memory applications. Features: Low-power CMOS technology High-speed access time: 45ns Low-power standby mode Single 5V power supply High-reliability Low-power CMOS design TTL-compatible inputs and outputs Fully static operation Data retention during power-down Automatic power-down after last access Available in 24-pin SOP package Applications: Automotive Industrial Medical Military Networking Telecommunications (For reference only)