M41T81
Serial access real-time clock with alarm
Not For New Design
Features
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For 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 I
2
C 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 switch-over and deselect circuitry
(for 3V application select M41T81S datasheet)
Power-down time stamp (HT bit) allowing
determination of time elapsed in battery
backup
Programmable alarm and interrupt function
(valid even during battery backup mode)
Accurate programmable watchdog timer (from
62.5 ms to 128 s)
Software clock calibration to compensate
crystal deviation due to temperature
Operating temperature of –40 to 85°C
ECOPACK
®
package available
8
1
SO8 (M)
8-pin SOIC
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May 2008
Rev 9
1/30
www.st.com
1
This is information on a product still in production but not recommended for new designs.
STMICROELECTRONICS [ STMICROELECTRONICS ]
