BUY RTC72423 https://www.utsource.net/itm/p/248426.html
4-bit REAL TIME CLOCK MODULE
Description: The RTC72423 is a low power consumption real-time clock (RTC) IC from Epson. Features: * Low power consumption: 0.3 μA * Built-in oscillator * Built-in 32.768 kHz crystal oscillator * Built-in power-on reset circuit * Built-in battery switch circuit * Built-in voltage detection circuit * Built-in temperature compensation circuit * Built-in alarm function * Built-in leap year correction circuit * Built-in 24-hour counter * Built-in power-fail detection circuit Applications: * Automotive applications * Home appliances * Industrial equipment * Security systems * Wearable devices * Smartphones and tablets (For reference only)