M41ST84WSH datasheet(1/31 Pages) STMICROELECTRONICS

Part #	M41ST84WSH

Description	5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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June 2003

Rev. 4.0

M41ST84Y

M41ST84W

5.0 or 3.0V, 512 bit (64 x 8) SERIAL RTC

with SUPERVISORY FUNCTIONS

* Contact Local Sales Office

FEATURES SUMMARY

s

5.0 OR 3.0V OPERATING VOLTAGE

s

SERIAL INTERFACE SUPPORTS I2C BUS

(400 KHz)

s

OPTIMIZED FOR MINIMAL INTERCONNECT

TO MCU

s

2.5 TO 5.5V OSCILLATOR OPERATING

VOLTAGE

s

AUTOMATIC SWITCH-OVER and DESELECT

CIRCUITRY

s

CHOICE OF POWER-FAIL DESELECT

VOLTAGES:

– M41ST84Y: VCC = 4.5 to 5.5V;

4.20V

≤ VPFD ≤ 4.50V

– M41ST84W: VCC = 2.7 to 3.6V;

2.55V

≤ VPFD ≤ 2.70V

s

1.25V REFERENCE (for PFI/PFO)

s

COUNTERS FOR TENTHS/HUNDREDTHS

OF SECONDS, SECONDS, MINUTES,

HOURS, DAY, DATE, MONTH, YEAR, and

CENTURY

s

44 BYTES OF GENERAL PURPOSE RAM

s

PROGRAMMABLE ALARM and INTERRUPT

FUNCTION (VALID EVEN DURING BATTERY

BACK-UP MODE)

s

WATCHDOG TIMER

s

MICROPROCESSOR POWER-ON RESET

s

BATTERY LOW FLAG

s

ULTRA-LOW BATTERY SUPPLY CURRENT

OF 500 nA (max)

s

OPTIONAL PACKAGING INCLUDES A 28-

LEAD SOIC and SNAPHAT® TOP (to be

ordered separately)

s

SNAPHAT PACKAGE PROVIDES DIRECT

CONNECTION FOR A SNAPHAT TOP,

WHICH CONTAINS THE BATTERY and

CRYSTAL

Figure 1. 16-pin SOIC Package

Figure 2. 28-pin SOIC Package*

16

1

SO16 (MQ)

28

1

SOH28 (MH)

SNAPHAT (SH)

Battery & Crystal

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