BUY M48T12-200PC1 https://www.utsource.net/itm/p/235809.html
16 Kbit 2Kb x8 TIMEKEEPER[ SRAM
Description: The M48T12-200PC1 is a non-volatile timekeeping device manufactured by STMicroelectronics. It is a 24-pin dual in-line package (DIP) Real-Time Clock (RTC) that is used to keep track of time and date. Features: - Low power consumption - Low voltage operation - High accuracy - Battery-backed SRAM - Programmable clock/calendar - Automatic power-fail detect and switch - Programmable alarm - Programmable square wave output - Programmable frequency output Applications: - Automotive - Industrial - Medical - Networking - Home appliances - Security systems (For reference only)