M41ST87WMX6TR datasheet(1/48 Pages) STMICROELECTRONICS

Part #	M41ST87WMX6TR

Description	5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM

PDF	48 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 48 page

September 2008

Rev 7

1/48

1

M41ST87Y

M41ST87W

5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor

with tamper detection and 128 bytes of clearable NVRAM

Features

■ 5.0, 3.3, or 3.0 V operation

■ 400 kHz I2C bus

■ NVRAM supervisor to non-volatize external

LPSRAM

■ 2.5 to 5.5 V oscillator operating voltage

■ Automatic switchover and deselect circuitry

■ Choice of power-fail deselect voltages

– M41ST87Y:

THS = 1: VPFD≈ 4.63 V; VCC = 4.75 to 5.5 V

THS = 0: VPFD≈ 4.37 V; VCC = 4.5 to 5.5 V

– M41ST87W:

THS = 1: VPFD ≈ 2.9 V; VCC = 3.0 to 3.6 V

THS = 0: VPFD ≈ 2.63 V; VCC = 2.7 to 3.6 V

■ Two independent power-fail comparators

(1.25 V reference)

■ Counters for tenths/hundredths of seconds,

seconds, minutes, hours, day, date, month,

year, and century

■ 128 bytes of clearable, general purpose

NVRAM

■ Programmable alarm and interrupt function

(valid even during battery backup mode)

■ Programmable watchdog timer

■ Unique electronic serial number (8-byte)

■ 32 kHz frequency output available upon power-

on

■ Microprocessor power-on reset output

■ Battery low flag

■ Ultra-low battery supply current of 500 nA (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

28-pin, (300 mil)

SOX28 (MX)

Embedded crystal

www.st.com

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M41ST87WMX6TR Datasheet(PDF) 1 Page - STMicroelectronics

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