- The real time clock has the ability of calculating prior to the 2100 seconds， points， hours， 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， Vcc=5V
- Double main and backup power supplies
- Power LED indicator
- Great for DIY project