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BUY DS1642-100 https://www.utsource.net/itm/p/762410.html
Nonvolatile Timekeeping RAM
The DS1642-100 is a nonvolatile timekeeping device manufactured by Dallas Semiconductor. It is a 24-pin DIP (dual in-line package) that is used to keep track of time and date. It features a real-time clock/calendar, a watchdog timer, and a power-fail detect circuit. The DS1642-100 provides a battery-backed clock/calendar circuit that keeps track of time and date in a binary format. It also includes a watchdog timer that can be used to detect system malfunctions and reset the system if necessary. The power-fail detect circuit monitors the power supply voltage and can be used to detect a power failure. The DS1642-100 is typically used in applications such as computers, servers, and embedded systems that require accurate timekeeping. It is also used in applications that require a watchdog timer or power-fail detect circuit. (For reference only)