BUY RTC-72421A:ROHS https://www.utsource.net/itm/p/7250883.html
Real Time Clock Parallel Clock/Calendar/Clock Adjustment 18-Pin PDIP
Description: RTC-72421A is a Real Time Clock (RTC) IC manufactured by Epson. It is a low power CMOS device that provides timekeeping functions for applications such as personal computers, embedded systems, and other electronic devices. Features: Low power consumption: 0.4μA (typical) 32.768kHz crystal oscillator 24-hour/12-hour time format Calendar function with leap year correction Alarm function Programmable timer Backup battery input 4-wire serial interface 8-pin PDIP package Applications: Personal computers Embedded systems Other electronic devices (For reference only)