m41t81s STMicroelectronics, m41t81s Datasheet

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m41t81s

Manufacturer Part Number

m41t81s

Description

Serial Access Real-time Clock With Alarms

Manufacturer

STMicroelectronics

Datasheet

1.M41T81S.pdf (31 pages)

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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

1

1

M41T81S

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