DS1307 Module is a real-time clock module with 32kHz and has an onboard battery backup. This module provides seconds minutes hours date week and year with leap-year compensation up to 2100. It is a small size module that?s why it is easy to plug in even on a breadboard. It has the functionality to set in 24 hours and 12 hours. It is a real time clock module so after removing the power also it sore the real-time and whenever power is given it starts with real time. Module is compatible with microprocessors and Arduino. 

Specification

Voltage supply range: 4.5V to 5.5V

Typical voltage supply: 5V

High (1) level voltage supply: 2.2V to 5.3V

Low (0) level voltage supply: -0.3V to +0.8V

Battery voltage:  2V to 3.3V

Power consumption: 500nA

Data storage: nonvolatile RAM

Application

To make real time clock

Pin Description

OS

SCL ? analog pin5

SDA ? analog pin4

Vcc

Gnd

Product Details : DS1307 RTC Real Time Clock Module with CR2025 Cell - R107