M41ST95W Datasheet, PDF (1/35 Pages) STMicroelectronics – 5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor

M41ST95Y*
M41ST95W
5.0 or 3.0V, 512 bit (64 bit x8) Serial RTC
(SPI) SRAM and NVRAM Supervisor
FEATURES SUMMARY
■ 5.0 OR 3.0V OPERATING VOLTAGE
■ SERIAL PERIPHERAL INTERFACE (SPI)
■ 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:
– M41ST95Y*: V_CC = 4.5 to 5.5V
4.20V ≤ V_PFD ≤ 4.50V
– M41ST95W: V_CC = 2.7 to 3.6V
2.55V ≤ V_PFD ≤ 24.70V
■ 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
■ 32kHz FREQUENCY OUTPUT AVAILABLE
IMMEDIATELY UPON POWER-ON (300mil
SO28 MX PACKAGE ONLY)
■ AUTOMATICALLY RECORDS TIME WHEN
POWER-FAIL OCCURS
■ ULTRA-LOW BATTERY SUPPLY CURRENT
OF 550nA (MAX)
■ PACKAGING INCLUDES A 28-LEAD SOIC
and SNAPHAT^® TOP (to be ordered
separately)
■ SOIC PACKAGE PROVIDES DIRECT
CONNECTION FOR A SNAPHAT TOP
WHICH CONTAINS THE BATTERY and
CRYSTAL
Figure 1. 28-pin SOIC Package*
SNAPHAT (SH)
Battery & Crystal
28
1
SOH28 (MH)
Figure 2. 28-pin (300mil) SOIC Package
Embedded Crystal
SOX28 (MX)
* Contact Local Sales Office
September 2004
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