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M48T251Y-70PM1TR Datasheet(PDF) 1 Page - STMicroelectronics |
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M48T251Y-70PM1TR Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 24 page 1/24 February 2005 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: (VPFD = Power-fail Deselect Voltage): – M48T251Y: 4.25V ≤ V PFD ≤ 4.50V – M48T251V: 2.80V ≤ V PFD ≤ 2.97V ■ 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 Figure 1. 32-pin, DIP Package 32 1 PMDIP32 (PM) |
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