BUY DS1687-5+ https://www.utsource.net/itm/p/11243815.html
IC RTC CLK/CALENDAR PAR 24-EDIP
The DS1687-5+ is a Real-Time Clock (RTC) and calendar integrated circuit manufactured by Dallas Semiconductor. It is a low-power, full-featured device that is designed to keep track of time in digital format. The DS1687-5+ features a 32-bit binary counter, a 32-bit binary counter, and a 32-bit binary counter. It also has a battery-backed RAM, a programmable alarm, and a programmable watchdog timer. The device is available in a DIP package and operates over a temperature range of -40°C to +85°C. The DS1687-5+ is used in a variety of applications such as timekeeping, data logging, and security systems. It is also used in embedded systems, medical devices, and industrial control systems. (For reference only)