Details, datasheet, quote on part number: M48T37Y-70MH1E
PartM48T37Y-70MH1E
Category
Description3.3V-5V 256 Kbit (32KB X8) Timekeeper SRAM
CompanyST Microelectronics, Inc.
DatasheetDownload M48T37Y-70MH1E datasheet
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Features, Applications

INTEGRATED ULTRA-LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, AND BATTERY FREQUENCY TEST OUTPUT FOR REAL TIME CLOCK SOFTWARE CALIBRATION YEAR 2000 COMPLIANT AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION WATCHDOG TIMER WRITE PROTECT VOLTAGE (VPFD = Power-Fail Deselect Voltage): ­ M48T37Y: VCC 5.5V 4.2V VPFD ­ M48T37V: VCC 3.6V 2.7V VPFD 3.0V PACKAGING INCLUDES A 44-LEAD SOIC AND SNAPHATŪ TOP (to be ordered separately) SOIC PACKAGE PROVIDES DIRECT CONNECTION FOR A SNAPHAT TOP WHICH CONTAINS THE BATTERY AND CRYSTAL MICROPROCESSOR POWER-ON RESET (Valid even during battery back-up mode) PROGRAMMABLE ALARM OUTPUT ACTIVE IN THE BATTERY BACK-UP MODE BATTERY LOW FLAG

FEATURES SUMMARY. 1 Figure 1. Package. 1 SUMMARY DESCRIPTION. 4 Figure 2. Table 1. Figure 3. Figure 4. Logic Diagram. Signal Names. SOIC Connections. Block Diagram.............................................................................................................................................................4.....4.....5.....6

OPERATION MODES. 7 Table 2. Operating Modes. 7 READ Mode. 8 Figure 5. READ Mode AC Waveforms. 8 Table 3. READ Mode AC Characteristics. 8 WRITE Mode. 9 Figure 6. WRITE Enable Controlled, WRITE AC Waveform. 9 Figure 7. Chip Enable Controlled, WRITE AC Waveforms. 9 Table 4. WRITE Mode AC Characteristics. 10 Data Retention Mode. 11 CLOCK OPERATIONS. 12 Reading the Clock. 12 Setting the Clock. 12 Stopping and Starting the Oscillator. 12 Table 5. Register Map. 13 Setting the Alarm Clock. 14 Figure 8. Alarm Interrupt Reset Waveform. 14 Table 6. Alarm Repeat Modes. 14 Figure 9. Back-up Mode Alarm Waveforms. 15 Calibrating the Clock. 15 Watchdog Timer. 16 Power-on Reset. 16 Programmable Interrupts. 17 Battery Low Flag. 17 Initial Power-on Defaults. 17 Table 7. Default Values. 17 VCC Noise And Negative Going Transients. 18 Figure 10.Supply Voltage Protection. 18 Figure 11.Crystal Accuracy Across Temperature. 19 Figure 12.Clock Calibration. 19 MAXIMUM RATING. 20 Table 8. Absolute Maximum Ratings. 20

DC AND AC PARAMETERS. 21 Table 9. Operating and AC Measurement Conditions. 21 Figure 13.AC Testing Load Circuit. 21 Table 10. Capacitance. 21 Table 11. DC Characteristics. 22 Figure 14.Power Down/Up Mode AC Waveforms. 23 Table 12. Power Down/Up AC Characteristics. 23 Table 13. Power Down/Up Trip Points DC Characteristics. 23 PACKAGE MECHANICAL INFORMATION. 24 Figure ­ 44-lead Plastic Small Outline, 4-socket SNAPHAT, Package Outline. 24 Table ­ 44-lead Plastic Small Outline, 4-socket SNAPHAT, Package Mech. Data. 24 Figure ­ 4-pin SNAPHAT Housing for 48mAh Battery & Crystal, Package Outline. 25 Table ­ 4-pin SNAPHAT Housing for 48mAh Battery & Crystal, Package Mech. Data. 25 Figure ­ 4-pin SNAPHAT Housing for 120mAh Battery & Crystal, Package Outline. 26 Table ­ 4-pin SNAPHAT Housing for 120mAh Battery & Crystal, Package Mech. Data. 26 PART NUMBERING. 27 Table 17. Ordering Information Scheme. 27 Table 18. SNAPHAT Battery Table. 27 REVISION HISTORY. 28 Table 19. Document Revision History. 28


 

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