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M41T94 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. M41T94
Description  512 Bit 64 bit x8 SERIAL RTC SPI SRAM
Download  31 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M41T94 Datasheet(HTML) 1 Page - STMicroelectronics

 
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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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