BUY RTC72421A https://www.utsource.net/itm/p/298975.html
4-bit REAL TIME CLOCK MODULE ( 71.62
Description: RTC72421A is an Integrated Circuit offered by Epson that includes a real-time clock. This IC operates with a 1.5V to 5.5V supply voltage and is available in a DIP-18 package. Features: Low Power Consumption: 0.2μA in Clock Operating Mode High Accurate Timekeeping: ±2ppm (at 25°C) Experiments with Various Clock Outputs 1.5V to 5.5V Operating Voltage Built-in Crystal Compensator Applications: Smart meters Automotive instruments Server systems Home appliances Player equipment Network equipment Personal Computers (For reference only)