BUY DS1321S+ https://www.utsource.net/itm/p/7286231.html
SRAM & NVRAM Accessories, Maxim Integrated Products
The DS1321S+ is a Real-Time Clock (RTC) IC from Maxim Integrated. It is a low-power, low-cost, highly accurate timekeeping device that uses an external 32.768 kHz crystal oscillator to keep track of time. The device is available in a 16-pin SOP package. Description: The DS1321S+ is a low-power, low-cost, highly accurate timekeeping device. It uses an external 32.768 kHz crystal oscillator to keep track of time. The device is available in a 16-pin SOP package. The device includes a battery-backed RAM, a clock/calendar, and a programmable alarm. Features: Low-power CMOS technology Battery-backed RAM Clock/calendar Programmable alarm 32.768 kHz crystal oscillator 16-pin SOP package Applications: The DS1321S+ is suitable for a wide range of applications, including: Automotive Industrial Medical Networking Security Telecom Wearable devices (For reference only)