The real time clock has the ability of calculating prior to the 2100 seconds， points， week， month， year， and the ability to adjust a leap year
31 8-bit RAM
Wide working voltage: 2.0~5.5 V
When The working voltage is 2.0V， the current is less than 300nA
Read/write clock or RAM data have two transmission way: Single-byte / many bytes group
8 feet DIP assembly or optional 8 feet SOIC encapsulation according to surface assembly
Simple 3 line interface
Compatible with TTL
Double main and backup power supplies
Power LED indicator