Description: 31 x 8 RAM for scratchpad data storage Serial I/O interface for minimum pin count Wide Working Voltage: 2.0 ~ 5.5V Single-byte and multi-byte transmission for clock or RAM data read / write TTL-compatible (Vcc=5V) Working Temperature: 0 to +70 Deg C 32.768KHz crystal oscillator Equipped with a 260mAh CR2032 button battery, not rechargeable Overall Size: Approx. 44 x 23 x 11mm Vcc - +5V / 3.3V GND - GND CLK - P01 DAT - P02 RST - P00 Package Included: 1pcs X DS1302 Real Clock Module