M41T81 Serial access real-time clock with alarm 8 1 SO8 8-pin SOIC Features  For all new designs use M41T81S  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 protocol)  Ultra-low battery supply current of 0.
6 ΜA (typ at 3 V)  2.
0 to 5.
5 V clock operating voltage  Automatic switchover and deselect circuitry (for 3 V application select M41T81S datasheet)  Power-down time stamp (HT bit) allowing determination of time elapsed in battery...

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