DS1302 RTC Real Time Clock Module with Battery

1. The real-time clock counts minutes, seconds, date, hours, month day of the week, year and leap-year compensation up to 2100. 
2. 318 temporary data storage RAM 
3. Working current of 2.0V, less than 300nA 
4. Read / Write clock or RAM data with two kinds of mode of single-byte transfer mode and multi-byte character set 
5. 8 pin DIP package or optional 8 pin SOIC package based on the surface assembly 
6. Simple 3 wire interface 
7. Compatible with TTL Vcc=5V 
8. Double power supply pipe for main power and backup power supply.