M48T37Y Datasheet, PDF (1/29 Pages) STMicroelectronics – 3.3V-5V 256 Kbit 32Kb x8 TIMEKEEPER SRAM

M48T37Y
M48T37V
5.0 or 3.3V, 256 Kbit (32 Kbit x8) TIMEKEEPER^® SRAM
FEATURES SUMMARY
■ INTEGRATED ULTRA-LOW POWER SRAM,
REAL TIME CLOCK, POWER-FAIL
CONTROL CIRCUIT, AND BATTERY
■ FREQUENCY TEST OUTPUT FOR REAL
TIME CLOCK SOFTWARE CALIBRATION
■ YEAR 2000 COMPLIANT
■ AUTOMATIC POWER-FAIL CHIP
DESELECT and WRITE PROTECTION
■ WATCHDOG TIMER
■ WRITE PROTECT VOLTAGE
(V_PFD = Power-Fail Deselect Voltage):
– M48T37Y: V_CC = 4.5 to 5.5V
4.2V ≤ V_PFD ≤ 4.5V
– M48T37V: V_CC = 3.0 to 3.6V
2.7V ≤ V_PFD ≤ 3.0V
■ PACKAGING INCLUDES A 44-LEAD SOIC
AND SNAPHAT^® TOP (to be ordered
separately)
■ SOIC PACKAGE PROVIDES DIRECT
CONNECTION FOR A SNAPHAT TOP
WHICH CONTAINS THE BATTERY AND
CRYSTAL
■ MICROPROCESSOR POWER-ON RESET
(Valid even during battery back-up mode)
■ PROGRAMMABLE ALARM OUTPUT
ACTIVE IN THE BATTERY BACK-UP MODE
■ BATTERY LOW FLAG
■ RoHS COMPLIANCE
Lead-free components are compliant with the
RoHS directive.
Figure 1. Package
SNAPHAT (SH)
Battery/Crystal
44
1
SOH44 (MH)
44-pin SOIC
February 2006
Rev 6.0
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