Details, datasheet, quote on part number: M48T35Y-70MH1TR
PartM48T35Y-70MH1TR
Category
Description256 Kbit (32KB X8) Timekeeper SRAM
CompanyST Microelectronics, Inc.
DatasheetDownload M48T35Y-70MH1TR datasheet
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Features, Applications

INTEGRATED, ULTRA LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT AND BATTERY BYTEWIDETM RAM-LIKE CLOCK ACCESS BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES, AND SECONDS FREQUENCY TEST OUTPUT FOR REAL TIME CLOCK AUTOMATIC POWER-FAIL CHIP DESELECT AND WRITE PROTECTION WRITE PROTECT VOLTAGES (VPFD = Power-fail Deselect Voltage): ­ M48T35: VCC 5.5V 4.5V VPFD ­ M48T35Y: VCC 5.5V 4.2V VPFD 4.5V SELF-CONTAINED BATTERY AND CRYSTAL IN THE CAPHATTM DIP PACKAGE SOIC PACKAGE PROVIDES DIRECT CONNECTION FOR A SNAPHATŪ HOUSING CONTAINING THE BATTERY AND CRYSTAL SNAPHATŪ HOUSING (BATTERY AND CRYSTAL) IS REPLACEABLE PIN AND FUNCTION COMPATIBLE WITH JEDEC STANDARD x 8 SRAMs

FEATURES SUMMARY. 1 Figure 1. 28-pin PCDIP, CAPHATTM Package. 1 Figure 2. 28-pin SOIC Package. 1 SUMMARY DESCRIPTION. 4 Figure 3. Table 1. Figure 4. Figure 5. Figure 6. Logic Diagram. Signal Names. DIP Connections. SOIC Connections. Block Diagram............................................................................................................................................4.....4.....5.....5.....5

OPERATION MODES. 6 Table 2. Operating Modes. 6 READ Mode. 7 Figure 7. READ Mode AC Waveforms. 7 Table 3. READ Mode AC Characteristics. 7 WRITE Mode. 8 Figure 8. WRITE Enable Controlled, WRITE AC Waveform. 8 Figure 9. Chip Enable Controlled, WRITE AC Waveforms. 8 Table 4. WRITE Mode AC Characteristics. 9 Data Retention Mode. 10 CLOCK OPERATIONS. 11 Reading the Clock. 11 Setting the Clock. 11 Stopping and Starting the Oscillator. 11 Table 5. Register Map. 11 Calibrating the Clock. 12 Century Bit. 12 Figure 10.Crystal Accuracy Across Temperature. 13 Figure 11.Clock Calibration. 13 VCC Noise And Negative Going Transients. 14 Figure 12.Supply Voltage Protection. 14 MAXIMUM RATING. 15 Table 6. Absolute Maximum Ratings. 15 DC AND AC PARAMETERS. 16 Table 7. Operating and AC Measurement Conditions. Figure 13.AC Measurement Load Circuit. Table 8. Capacitance. Table 9. DC Characteristics. Figure 14.Power Down/Up Mode AC Waveforms..........................

Table 10. Power Down/Up AC Characteristics. 18 Table 11. Power Down/Up Trip Points DC Characteristics. 18 PACKAGE MECHANICAL INFORMATION. 19 Figure ­ 28-pin Plastic DIP, battery CAPHAT, Package Outline. 19 Table ­ 28-pin Plastic DIP, battery CAPHAT, Package Mechanical Data. 19 Figure ­ 28-lead Plastic Small Outline, 4-socket battery SNAPHAT, Package Outline. 20 Table ­ 28-lead Plastic SO, 4-socket battery SNAPHAT, Package Mech. Data. 20 Figure ­ 4-pin SNAPHAT Housing for 48mAh Battery & Crystal, Package Outline. 21 Table ­ 4-pin SNAPHAT Housing for 48mAh Battery & Crystal, Package Mech. Data. 21 Figure ­ 4-pin SNAPHAT Housing for 120mAh Battery & Crystal, Package Outline. 22 Table ­ 4-pin SNAPHAT Housing for 120mAh Battery & Crystal, Package Mech. Data. 22 Figure ­ 28-pin Plastic DIP, Hybrid, Package Outline. 23 Table ­ 28-pin Plastic DIP, Hybrid, Package Mechanical Data. 23 PART NUMBERING. 24 Table 17. Ordering Information Scheme. 24 Table 18. SNAPHAT Battery Table. 24 REVISION HISTORY. 25 Table 19. Document Revision History. 25


 

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