STMicroelectronics M41T80M6F, Real Time Clock Serial-2 Wire, Serial-I2C, 8-Pin SOIC

Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century
32 KHz crystal oscillator integrating load capacitance (12.5 pF) providing exceptional oscillator stability and high crystal series resistance operation
Serial interface supports I2C bus (400 kHz)
2.0 to 5.5 V clock operating voltage
32 KHz square wave on power-up to drive a microcontroller in low-power mode
Programmable (1 Hz to 32 KHz) square wave
Programmable alarm and interrupt function
Low operating current of 200 μA
Operating temperature of –40 to 85 °C