M4T32-BR12SH

Manufacturer Part NumberM4T32-BR12SH
Description5.0 OR 3.0V, 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR
ManufacturerSTMICROELECTRONICS [STMicroelectronics]
M4T32-BR12SH datasheet
 


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FEATURES SUMMARY
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
M41ST85Y: V
= 4.5 to 5.5V;
CC
4.20V
V
4.50V
PFD
M41ST85W: V
= 2.7 to 3.6V;
CC
2.55V
V
2.70V
PFD
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
TOP (to be ordered
separately)
SOIC SNAPHAT PACKAGE PROVIDES
DIRECT CONNECTION FOR A SNAPHAT
TOP WHICH CONTAINS THE BATTERY
AND CRYSTAL
SOIC EMBEDDED CRYSTAL PACKAGE
(MX) OPTION
September 2004
5.0 or 3.0V, 512 bit (64 x 8)
Serial RTC and NVRAM Supervisor
Figure 1. 28-pin SOIC Package
2
C BUS
Figure 2. 28-pin (300mil) SOIC Package
M41ST85Y
M41ST85W
SNAPHAT (SH)
Battery & Crystal
28
1
SOH28 (MH)
EMBEDDED Crystal
SOX28 (MX)
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