M4T32-BR12SH STMICROELECTRONICS [STMicroelectronics], M4T32-BR12SH Datasheet

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M4T32-BR12SH

Manufacturer Part Number

M4T32-BR12SH

Description

5.0 OR 3.0V, 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR

Manufacturer

STMICROELECTRONICS [STMicroelectronics]

Datasheet

1.M4T32-BR12SH.pdf (34 pages)

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Part Number

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FEATURES SUMMARY

September 2004

5.0 OR 3.0V OPERATING VOLTAGE

SERIAL INTERFACE SUPPORTS I

(400 KHz)

NVRAM SUPERVISOR FOR EXTERNAL

LPSRAM

OPTIMIZED FOR MINIMAL

INTERCONNECT TO MCU

2.5 TO 5.5V OSCILLATOR OPERATING

VOLTAGE

AUTOMATIC SWITCH-OVER AND

DESELECT CIRCUITRY

CHOICE OF POWER-FAIL DESELECT

VOLTAGES

–

–

1.25V REFERENCE (for PFI/PFO)

COUNTERS FOR TENTHS/HUNDREDTHS

OF SECONDS, SECONDS, MINUTES,

HOURS, DAY, DATE, MONTH, YEAR, AND

CENTURY

44 BYTES OF GENERAL PURPOSE RAM

PROGRAMMABLE ALARM AND

INTERRUPT FUNCTION (VALID EVEN

DURING BATTERY BACK-UP MODE)

WATCHDOG TIMER

MICROPROCESSOR POWER-ON RESET

BATTERY LOW FLAG

POWER-DOWN TIMESTAMP (HT BIT)

ULTRA-LOW BATTERY SUPPLY CURRENT

OF 500nA (MAX)

PACKAGING INCLUDES A 28-LEAD SOIC

AND SNAPHAT

separately)

SOIC SNAPHAT PACKAGE PROVIDES

DIRECT CONNECTION FOR A SNAPHAT

TOP WHICH CONTAINS THE BATTERY

AND CRYSTAL

SOIC EMBEDDED CRYSTAL PACKAGE

(MX) OPTION

M41ST85Y: V

4.20V

M41ST85W: V

2.55V

V

V

PFD

PFD

®

TOP (to be ordered

CC

CC

4.50V

2.70V

= 4.5 to 5.5V;

= 2.7 to 3.6V;

2

C BUS

Serial RTC and NVRAM Supervisor

Figure 1. 28-pin SOIC Package

Figure 2. 28-pin (300mil) SOIC Package

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

28

EMBEDDED Crystal

Battery & Crystal

SNAPHAT (SH)

SOH28 (MH)

SOX28 (MX)

1

M41ST85W

M41ST85Y

1/34

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