Real time clock module

Model: DS1302.
Real time clock module.
The DS1302 trickle-charge timekeeping chip module with battery backup contains a real-time clock/calendar and 31 bytes of static RAM. It communicates with a microprocessor via a simple serial interface. The real-time clock/calendar provides seconds, minutes, hours, day, date, month, and year information. Works with Arduino, Raspberry Pi and others microcontrollers.

The real-time clock counts minutes, seconds, date, hours, month day of the week, year and leap-year compensation up to 2100.
318 temporary data storage RAM
Working current of 2.0V, less than 300nA
Read / Write clock or RAM data with two kinds of mode of single-byte transfer mode and multi-byte character set
Simple 3 wire interface
Compatible with TTL Vcc=5V
Double power supply for main power and backup power supply.
Size: aprox. 44 x 23 x 11 mm