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M4T28-BR12SH Scheda tecnica(PDF) 1 Page - STMicroelectronics

Il numero della parte M4T28-BR12SH
Spiegazioni elettronici  5.0 OR 3.0V, 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M4T28-BR12SH Scheda tecnica(HTML) 1 Page - STMicroelectronics

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September 2004
M41ST85Y
M41ST85W
5.0 or 3.0V, 512 bit (64 x 8)
Serial RTC and NVRAM Supervisor
FEATURES SUMMARY
5.0 OR 3.0V OPERATING VOLTAGE
SERIAL INTERFACE SUPPORTS I2C BUS
(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: VCC = 4.5 to 5.5V;
4.20V
≤ VPFD ≤ 4.50V
M41ST85W: VCC = 2.7 to 3.6V;
2.55V
≤ VPFD ≤ 2.70V
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
Figure 1. 28-pin SOIC Package
Figure 2. 28-pin (300mil) SOIC Package
28
1
SOH28 (MH)
SNAPHAT (SH)
Battery & Crystal
SOX28 (MX)
EMBEDDED Crystal


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