M41ST87WMX6 datasheet(1/42 Pages) STMICROELECTRONICS

Part #	M41ST87WMX6

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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Manufacturer	STMICROELECTRONICS [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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STMicroelectronics	M41ST87WMX6	461Kb / 48P	5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
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Manufacturer	Part #	Datasheet	Description
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M41ST87WMX6 Datasheet(PDF) 1 Page - STMicroelectronics

M41ST87WMX6 Datasheet(HTML) 1 Page - STMicroelectronics

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