M41ST85W datasheet(1/34 Pages) STMICROELECTRONICS

Il numero della parte	M41ST85W

Spiegazioni elettronici	5.0 OR 3.0V, 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR

PDF	34 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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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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Produttore elettronici	Il numero della parte	Scheda tecnica	Spiegazioni elettronici
STMicroelectronics	M41ST84Y	452Kb / 31P	5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS Rev. 4.0
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