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M4T32-BR12SH fiches techniques PDF

ST Microelectronics - 256 Kbit 32K x8 SERIAL RTC

Numéro de référence M4T32-BR12SH
Description 256 Kbit 32K x8 SERIAL RTC
Fabricant ST Microelectronics 
Logo ST Microelectronics 





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M4T32-BR12SH fiche technique
M41ST85Y
M41ST85W
5.0 OR 3.0V, 512 bit (64 x 8) SERIAL
RTC and NVRAM SUPERVISOR
FEATURES SUMMARY
s 5.0 OR 3.0V OPERATING VOLTAGE
s SERIAL INTERFACE SUPPORTS I2C BUS
(400 KHz)
s NVRAM SUPERVISOR FOR EXTERNAL
LPSRAM
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
– M41ST85Y: VCC = 4.5 to 5.5V;
4.20V VPFD 4.50V
– M41ST85W: 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 POWER-DOWN TIMESTAMP (HT BIT)
s ULTRA-LOW BATTERY SUPPLY CURRENT
OF 500nA (MAX)
s PACKAGING INCLUDES A 28-LEAD SOIC and
SNAPHAT® TOP (to be Ordered Separately)
s SOIC SNAPHAT PACKAGE PROVIDES
DIRECT CONNECTION FOR A SNAPHAT
TOP WHICH CONTAINS THE BATTERY and
CRYSTAL
s SOIC EMBEDDED CRYSTAL PACKAGE (MX)
OPTION
Figure 1. 28-pin SOIC Package
SNAPHAT (SH)
Battery & Crystal
28
1
SOH28 (MH)
Figure 2. 28-pin (300mil) SOIC Package
EMBEDDED Crystal
SOX28 (MX)
May 2003
Rev. 4.0
1/33

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