Details, datasheet, quote on part number: M48T251Y
PartM48T251Y
CategoryMemory => NVRAM (Non-Volatile RAM) => Timekeeper
TitleTimekeeper
Description5.0 or 3.3V, 4096K Timekeeper%ae SRAM With Phantom
CompanyST Microelectronics, Inc.
DatasheetDownload M48T251Y datasheet
  

 

Features, Applications

REAL TIME CLOCK KEEPS TRACK OF TENTHS/HUNDREDTHS OF 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 M48T251V: 2.80V

FULL 10% VCC OPERATING RANGE OVER 10 YEARS' DATA RETENTION IN THE ABSENCE OF POWER WATCH FUNCTION IS TRANSPARENT TO RAM OPERATION 8 NV SRAM DIRECTLY REPLACES VOLATILE STATIC RAM OR EEPROM

TABLE OF CONTENTS SUMMARY DESCRIPTION. 4 Figure 2. Logic Diagram. Table 1. Signal Names. Figure 3. DIP Connections. Figure 4. Block Diagram.....4.....4.....4.....5

MAXIMUM RATING. 6 Table 2. Absolute Maximum Ratings. 6 DC AND AC PARAMETERS. 7 Table 3. DC and AC Measurement Conditions. 7 Figure 5. AC Testing Load Circuit. 7 Table 4. Capacitance. 7 Table 5. DC Characteristics. 8 OPERATION MODES. 9 Table 6. Operating Modes. 9 READ. 9 WRITE. 9 Figure 6. Memory READ Cycle. 9 Figure 7. Memory WRITE Cycle 1. 10 Figure 8. Memory WRITE Cycle 2. 11 Table 7. Memory AC Characteristics, M48T251Y. 12 Table 8. Memory AC Characteristics, M48T251V. 13 Data Retention Mode. 14 Figure 9. Power Down/Up Mode AC Waveforms. 14 Table 9. Power Down/Up Trip Points DC Characteristics. 14 PHANTOM CLOCK OPERATION. 15 Figure 10. Comparison Register Definition. 16 Clock Register Information. 17 Clock Accuracy. 17 AM-PM/12/24 Mode. 17 Oscillator and Reset Bits. 17

Zero Bits. 17 Table 10. Phantom Clock Register Map. 17 Figure 11. Phantom Clock READ Cycle. 18 Figure 12. Phantom Clock WRITE Cycle. 18 Figure 13. Phantom Clock Reset. 18 Table 11. Phantom Clock AC Characteristics (M48T251Y). 19 Table 12. Phantom Clock AC Characteristics (M48T251V). 20 PACKAGE MECHANICAL INFORMATION. 21 PART NUMBERING. 22 REVISION HISTORY. 23


 

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