Details, datasheet, quote on part number: M48T512Y
PartM48T512Y
CategoryMemory => NVRAM (Non-Volatile RAM) => Timekeeper
TitleTimekeeper
Description3.3V-5V 4 MB (512K X 8) Timekeeper SRAM
CompanyST Microelectronics, Inc.
DatasheetDownload M48T512Y datasheet
  

 

Features, Applications

FEATURES SUMMARY s INTEGRATED ULTRA LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, BATTERY, and CRYSTAL

BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES, and SECONDS AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION WRITE PROTECT VOLTAGES: (VPFD = Power-fail Deselect Voltage) M48T512Y: VCC 5.5V 4.2V VPFD M48T512V*: VCC 3.6V 2.7V VPFD 3.0V CONVENTIONAL SRAM OPERATION; UNLIMITED WRITE CYCLES SOFTWARE CONTROLLED CLOCK CALIBRATION FOR HIGH ACCURACY APPLICATIONS 10 YEARS OF DATA RETENTION and CLOCK OPERATION IN THE ABSENCE OF POWER PIN and FUNCTION COMPATIBLE WITH INDUSTRY STANDARD x 8 SRAMS SELF-CONTAINED BATTERY and CRYSTAL IN DIP PACKAGE

* Contact local ST sales office for availability of 3.3V version.

TABLE OF CONTENTS SUMMARY DESCRIPTION. 4 Figure 2. Logic Diagram. 4 Table 1. Signal Names. 4 Figure 3. 32-pin DIP Connections. 4 Figure 4. Block Diagram. 5 MAXIMUM RATING. 5 Table 2. Absolute Maximum Ratings. 5 DC AND AC PARAMETERS. 6 Table 3. Operating and AC Measurement Conditions. Figure 5. AC Measurement Load Circuit. Table 4. Capacitance. Table DC Characteristics.....6.....6.....6.....7

OPERATING MODES. 7 Table 6. Operating Modes. 7 READ Mode. 8 Figure 6. READ Mode AC Waveforms. 8 Table 7. READ Mode AC Characteristics. 8 WRITE Mode. 9 Figure 7. WRITE AC Waveforms, WRITE Enable Controlled. 9 Figure 8. WRITE AC Waveforms, Chip Enable Controlled. 9 Table 8. WRITE Mode AC Characteristics. 10 Data Retention Mode. Figure 9. Power Down/Up Mode AC Waveforms. Table 9. Power Down/Up AC Characteristics. Table 10. Power Down/Up Trip Points DC Characteristics.

CLOCK OPERATIONS. 12 Reading the Clock. 12 Setting the Clock. 12 Stopping and Starting the Oscillator. 12 Table 11. Register Map. 13 Calibrating the Clock. 13 Figure 10. Crystal Accuracy Across Temperature. 14 Figure 11. Calibration Waveform. 14 VCC Noise And Negative Going Transients. 15 Figure 12. Supply Voltage Protection. 15

PACKAGE MECHANICAL INFORMATION. 16 PART NUMBERING. 17 REVISION HISTORY. 18

 

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