Features: 

1. Completely Manages All Timekeeping Functions
   1. Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the week, and Year with Leap-Year
      Compensation Valid Up to 2100
   2. 56-Byte, Battery-Backed, General-Purpose RAM with Unlimited Writes Programmable Square-Wave Output Signal
2. Simple Serial Port Interfaces to Most Microcontrollers
   1. I2C Serial Interface
3. Low Power Operation Extends Battery Backup Run Time
   1. Consumes Less than 500nA in BatteryBackup Mode with Oscillator Running
   2. Automatic Power-Fail Detect and Switch Circuitry
4. 8-Pin DIP and 8-Pin SO Minimizes Required Space
5. Optional Industrial Temperature Range: -40°C to +85°C Supports Operation in a Wide Range of Applications
6. Underwriters Laboratories® (UL) Recognized