Features
 For new designs use M41T00S
 Counters for seconds, minutes, hours, day,
month, years, 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 (100 kHz
protocol)
 Ultra low battery supply current of 0.8 μA
(typ at 3 V)
 2.0 to 5.5 V clock operating voltage
 Automatic switchover and deselect circuitry
(for 3 V application select M41T00S datasheet)
 Software clock calibration to compensate
crystal deviation due to temperature
 Automatic leap year compensation
 Operating temperature of -40 to 85 °C