m41t81s STMicroelectronics, m41t81s Datasheet
m41t81s
Manufacturer Part Number
m41t81s
Description
Serial Access Real-time Clock With Alarms
Manufacturer
STMicroelectronics
Datasheet
1.M41T81S.pdf
(31 pages)
Available stocks
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Part Number
Manufacturer
Quantity
Price
Part Number:
m41t81sM6E
Manufacturer:
ST
Quantity:
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m41t81sM6F
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m41t81sMX6
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Part Number:
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Quantity:
20 000
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January 2007
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 i
protocol)
Ultra-low battery supply current of 0.6μA (typ)
2.0 to 5.5v clock operating voltage
Automatic switchover and deselect circuitry
(fixed reference) which provides full operation
in 3.0V applications)
V
2.5V ≤ V
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
CC
= 2.7 to 5.5V
PFD
≤ 2.7V
2
c bus (400kHz
Serial access real-time clock with alarms
Rev 5
with Embedded Crystal
18-pin (300mil) SOIC
18
SOX18 (MY)
8-pin SOIC
SO8 (M)
8
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