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M41T81S Datasheet(PDF) 1 Page - STMicroelectronics

Part # M41T81S
Description  Serial access real-time clock with alarms
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T81S Datasheet(HTML) 1 Page - STMicroelectronics

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January 2007
Rev 5
1/31
1
M41T81S
Serial access real-time clock with alarms
Features
■ Counters for tenths/hundredths of seconds,
seconds, minutes, hours, day, date, month,
year, and century
■ 32KHz crystal oscillator with integrated load
capacitance (12.5pf) which provides
exceptional oscillator stability and high crystal
series resistance operation)
■ Oscillator stop detection (monitors clock
operation)
■ Serial interface supports i2c bus (400kHz
protocol)
■ Ultra-low battery supply current of 0.6
μA (typ)
■ 2.0 to 5.5v clock operating voltage
■ Automatic switchover and deselect circuitry
(fixed reference) which provides full operation
in 3.0V applications)
■ VCC = 2.7 to 5.5V
■ 2.5V
≤ VPFD ≤ 2.7V
■ Power-down time stamp (ht bit) which allows
determination of time elapsed in battery back-
up
■ Battery low flag
■ Programmable alarm and interrupt function
(valid even during battery back-up mode)
■ Accurate programmable watchdog timer (from
62.5ms to 128s)
■ Software clock calibration (to compensate for
crystal deviation due to temperature)
■ Operating temperature of –40 to 85°C
■ Package options include an 8-lead SOIC or 18-
lead embedded crystal SOIC
8
1
1
18
SO8 (M)
8-pin SOIC
SOX18 (MY)
18-pin (300mil) SOIC
with Embedded Crystal
www.st.com


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