M41ST87WMX6TR View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
M41ST87WMX6TR
STMicroelectronics
'M41ST87WMX6TR' PDF : 42 Pages View PDF
M41ST87Y
M41ST87W
5.0, 3.3, or 3.0V, 1280 bit (160 x8) Secure Serial RTC
and NVRAM Supervisor with Tamper Detection
FEATURES SUMMARY
■ 5.0, 3.3, OR 3.0V OPERATING VOLTAGE
■ SERIAL INTERFACE SUPPORTS I2C BUS
(400kHz)
■ NVRAM SUPERVISOR FOR EXTERNAL
LPSRAM
■ 2.5 TO 5.5V OSCILLATOR OPERATING
VOLTAGE
■ AUTOMATIC SWITCH-OVER AND
DESELECT CIRCUITRY
■ CHOICE OF POWER-FAIL DESELECT
VOLTAGES
– M41ST87Y:
VCC = 4.75 to 5.5V;
THS Bit = '1': 4.50V ≤ VPFD ≤ 4.75V
VCC = 4.5 to 5.5V;
THS Bit = '0': 4.20V ≤ VPFD ≤ 4.50V
– M41ST87W:
VCC = 3.0 to 3.6V;
THS Bit = '1': 2.8V ≤ VPFD ≤ 3.0V
VCC = 2.7 to 3.6V;
THS Bit = '0': 2.55V ≤ VPFD ≤ 2.70V
■ TWO INDEPENDENT POWER-FAIL
COMPARATORS (1.25V REFERENCE)
■ COUNTERS FOR TENTHS/HUNDREDTHS
OF SECONDS, SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEAR, AND
CENTURY
■ 128 BYTES OF GENERAL PURPOSE RAM
■ PROGRAMMABLE ALARM AND
INTERRUPT FUNCTION (VALID EVEN
DURING BATTERY BACK-UP MODE)
■ PROGRAMMABLE WATCHDOG TIMER
■ UNIQUE ELECTRONIC SERIAL NUMBER
(8-BYTE)
■ 32kHz FREQUENCY OUTPUT AVAILABLE
UPON POWER-ON
■ MICROPROCESSOR POWER-ON RESET
■ BATTERY LOW FLAG
■ ULTRA-LOW BATTERY SUPPLY CURRENT
OF 500nA (TYP)
SECURITY FEATURES
■ TAMPER INDICATION CIRCUITS WITH
TIMESTAMP AND RAM CLEAR
■ LPSRAM CLEAR FUNCTION (TPCLR)
■ PACKAGING INCLUDES A 28-LEAD,
EMBEDDED CRYSTAL SOIC
■ OSCILLATOR STOP DETECTION
Figure 1. Package
EMBEDDED Crystal
28-pin, (300mil)
SOX28 (MX)
March 2006
Rev 6
1/42
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