BUY RTC8593A https://www.utsource.net/itm/p/1038614.html
I2C-BUS COMPATIBLE REAL TIME CLOCK MODULE
RTC8593A is a Real-Time Clock (RTC) IC manufactured by Epson. It is a 14-pin SOP package IC. Description: The RTC8593A is a low power CMOS Real-Time Clock (RTC) IC with a built-in 32.768 kHz crystal oscillator. It is designed to provide a full-function RTC with an alarm and a calendar. Features: Low power consumption Built-in 32.768 kHz crystal oscillator Real-time clock with alarm and calendar Battery backup I2C bus interface Programmable alarm Programmable frequency output Automatic power-fail detect and switch Applications: The RTC8593A is suitable for applications such as digital still cameras, digital video cameras, digital audio players, personal digital assistants (PDAs), and other portable electronic devices. (For reference only)