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M41ST87W Datasheet(PDF) 1 Page - STMicroelectronics

Part No. M41ST87W
Description  5.0, 3.3, or 3.0V, 1280 bit (160 x8) Secure Serial RTC and NVRAM Supervisor with Tamper Detection
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M41ST87W Datasheet(HTML) 1 Page - STMicroelectronics

 
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March 2006
M41ST87Y
M41ST87W
5.0, 3.3, or 3.0V, 1280 bit (160 x8) Secure Serial RTC
and NVRAM Supervisor with Tamper Detection
Rev 6
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
28-pin, (300mil)
SOX28 (MX)
EMBEDDED Crystal


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