M41T94 datasheet(1/31 Pages) STMICROELECTRONICS

部件名	M41T94

功能描述	512 Bit 64 bit x8 SERIAL RTC SPI SRAM

PDF	31 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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June 2003

Rev. 2.0

M41T94

512 Bit (64 bit x8) SERIAL RTC (SPI) SRAM

FEATURES SUMMARY

s

2.7 TO 5.5V OPERATING VOLTAGE

s

SERIAL PERIPHERAL INTERFACE (SPI)

s

2.5 TO 5.5V OSCILLATOR OPERATING

VOLTAGE

s

AUTOMATIC SWITCH-OVER and DESELECT

CIRCUITRY

s

CHOICE OF POWER-FAIL DESELECT

VOLTAGES (VCC = 2.7 to 5.5V):

–THS = VSS; 2.55V ≤ VPFD ≤ 2.70V

–THS = VCC; 4.20V ≤ VPFD ≤ 4.50V

s

COUNTERS FOR TENTHS/HUNDREDTHS

OF SECONDS, SECONDS, MINUTES,

HOURS, DAY, DATE, MONTH, YEAR, and

CENTURY

s

44 BYTES OF GENERAL PURPOSE RAM

s

PROGRAMMABLE ALARM and INTERRUPT

FUNCTION (VALID EVEN DURING BATTERY

BACK-UP MODE)

s

WATCHDOG TIMER

s

MICROPROCESSOR POWER-ON RESET

s

BATTERY LOW FLAG

s

LOW OPERATING CURRENT OF 2.0mA

s

ULTRA-LOW BATTERY SUPPLY CURRENT

OF 500nA (MAX)

s

PACKAGING INCLUDES A 28-LEAD SOIC and

SNAPHAT® TOP (to be ordered separately) or

16-LEAD SOIC

s

28-LEAD SOIC PACKAGE PROVIDES

DIRECT CONNECTION FOR A SNAPHAT

TOP WHICH CONTAINS THE BATTERY and

CRYSTAL

Figure 1. 16-pin SOIC Package

Figure 2. 28-pin SOIC Package

16

1

SO16 (MQ)

28

1

SOH28 (MH)

SNAPHAT (SH)

Battery & Crystal

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