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M48T251Y M48T251V
5.0 or 3.3V, 4096K TIMEKEEPER® SRAM with PHANTOM
FEATURES SUMMARY s 5.0V OR 3.3V OPERATING VOLTAGE
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Figure 1. 32-pin, DIP Package
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: (VPFD = Power-fail Deselect Voltage): – M48T251Y: 4.25V ≤ VPFD ≤ 4.50V – M48T251V: 2.80V
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32 1
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PMDIP32 (PM)
≤ VPFD ≤ 2.97V
s s
FULL 10% VCC 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
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March 2003
Rev. 2.