M48T251Y Datasheet, PDF (1/24 Pages) STMicroelectronics – 5.0 or 3.3V, 4096K TIMEKEEPER SRAM with PHANTOM

M48T251Y
M48T251V
5.0 or 3.3V, 4096K TIMEKEEPER^® SRAM with PHANTOM
FEATURES SUMMARY
■ 5.0V OR 3.3V OPERATING VOLTAGE
■ REAL TIME CLOCK KEEPS TRACK OF
TENTHS/HUNDREDTHS OF SECONDS,
SECONDS, MINUTES, HOURS, DAYS,
DATE OF THE MONTH, MONTHS, AND
YEARS
■ AUTOMATIC LEAP YEAR CORRECTION
VALID UP TO THE YEAR 2100
■ AUTOMATIC SWITCH-OVER AND
DESELECT CIRCUITRY
■ CHOICE OF POWER-FAIL DESELECT
VOLTAGES:
(V_PFD = Power-fail Deselect Voltage):
– M48T251Y: 4.25V ≤ V_PFD ≤ 4.50V
– M48T251V: 2.80V ≤ V_PFD ≤ 2.97V
■ FULL 10% V_CC OPERATING RANGE
■ OVER 10 YEARS’ DATA RETENTION IN
THE ABSENCE OF POWER
■ WATCH FUNCTION IS TRANSPARENT TO
RAM OPERATION
■ 512K x 8 NV SRAM DIRECTLY REPLACES
VOLATILE STATIC RAM OR EEPROM
Figure 1. 32-pin, DIP Package
32
1
PMDIP32 (PM)
February 2005
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