M41T94_09 datasheet(1/41 Pages) STMICROELECTRONICS

Part #	M41T94

Description	Serial real-time clock with 44 bytes NVRAM and reset

PDF	41 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 41 page

January 2009

Rev 6

1/41

1

M41T94

Serial real-time clock with 44 bytes NVRAM and reset

Features

■ 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 peripheral interface (2 MHz SPI)

■ Ultralow battery supply current of 500 nA (max)

■ 2.7 to 5.5 V operating voltage

■ 2.5 to 5.5 V oscillator operating voltage

■ Battery low flag

■ Automatic switchover and deselect circuitry

■ 44 bytes of general purpose RAM

■ Programmable alarm and interrupt function

(valid even during battery backup mode)

■ Accurate programmable watchdog timer (from

62.5 ms to 128 s)

■ Microprocessor power-on reset

■ Choice of power-fail deselect voltages

(VCC = 2.7 to 5.5 V):

–THS = VSS; 2.55 V ≤ VPFD ≤ 2.70 V

–THS = VCC; 4.20 V ≤ VPFD ≤ 4.50 V

■ Packaging includes a 28-lead SOIC and

SNAPHAT® top (to be ordered separately) or

16-lead SOIC

■ 28-lead SOIC package provides direct

connection for a SNAPHAT® top which

contains the battery and crystal

■ RoHS compliant

– Lead-free second level interconnect

28

1

16

1

SO16 (MQ)

SOH28 (MH)

SNAPHAT® (SH)

battery & crystal

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