m48t248y STMicroelectronics, m48t248y Datasheet
m48t248y
Available stocks
Related parts for m48t248y
m48t248y Summary of contents
Page 1
... AUTOMATIC LEAP YEAR CORRECTION VALID UP TO THE YEAR 2100 AUTOMATIC SWITCH-OVER AND DESELECT CIRCUITRY CHOICE OF POWER-FAIL DESELECT VOLTAGES Power-fail Deselect Voltage): PFD – M48T248Y: 4.25V V – M48T248V: 2.80V V FULL 10% V OPERATING RANGE CC OVER 10 YEARS’ DATA RETENTION IN THE ABSENCE OF POWER WATCH FUNCTION IS TRANSPARENT TO ...
Page 2
... Zero Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 5. Phantom Clock Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Figure 9. Phantom Clock READ Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 10.Phantom Clock WRITE Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 11.Phantom Clock Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 6. Phantom Clock AC Characteristics (M48T248Y Table 7. Phantom Clock AC Characteristics (M48T248V MAXIMUM RATING Table 8. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 DC AND AC PARAMETERS Table 9. DC and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 12 ...
Page 3
... Table 12. Power Down/Up Trip Points DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 PACKAGE MECHANICAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Figure 14.PMDIP32 – 32-pin Plastic Module DIP, Package Outline . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 13. PMDIP32 – 32-pin Plastic Module DIP, Package Mechanical Data . . . . . . . . . . . . . . . . 21 PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 14. Ordering Information Example REVISION HISTORY Table 15. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 M48T248Y, M48T248V 3/24 ...
Page 4
... The clock operates in one of two formats: – a 12-hour mode with an AM/PM indicator; or – a 24-hour mode The M48T248Y 32-pin (PM) DIP module and invokes that integrates the RTC, the battery, and SRAM in CC one package. The modules are shipped in plastic, anti-static tubes (see Table 1. Signal Names A0– ...
Page 5
... DQ2 32.768 Hz CLOCK/CALENDAR CRYSTAL XI READ WRITE POWER FAIL DATA INTERNAL V CC POWER-FAIL V CC DETECT LOGIC V BAT M48T248Y, M48T248V V CC A15 NC WE A13 A8 A9 A11 OE A10 CE DQ7 DQ6 DQ5 DQ4 DQ3 AI04662 LOGIC UPDATE TIMEKEEPER REGISTER A0–A16 SRAM DQ0– ...
Page 6
... M48T248Y, M48T248V OPERATION MODES Table 2. Operating Modes V Mode CC Deselect 4.5V to 5.5V WRITE or READ 3.0V to 3.6V READ Deselect (min) SO PFD (1) Deselect V SO Note Battery Back-up Switchover Voltage See Table 12., page 20 for details. READ A READ cycle executes whenever WRITE Enable (WE) is high and Chip Enable (CE) is low (see ure 5 ...
Page 7
... WRITE cycles to avoid bus contention and OE are low (ac- tive), WE will disable the outputs for Output Data WRITE Time (t tAW tWP tODW HIGH IMPEDANCE M48T248Y, M48T248V ) before a subsequent WR ) from its falling edge. ODW tWC tWR tOEW ...
Page 8
... M48T248Y, M48T248V Figure 7. Memory WRITE Cycle 2 ADDRESSES CE WE DQ0–DQ7 Note during a WRITE cycle, the output buffers remain in a high impedance state low or the WE low transition occurs prior to or simultaneously with the CE low transition, the output buffers remain in a high impedance state during this period ...
Page 9
... Table 3. Memory AC Characteristics, M48T248Y Symbol t t READ Cycle Time AVAV Access Time AVQV ACC t t Chip Enable Low to Output Valid ELQV Output Enable Low to Output Valid GLQV OE t ELQX t Chip Enable or Output Enable Low to Output Transition COE t GLQX t Output Hold from Address Change ...
Page 10
... M48T248Y, M48T248V Table 4. Memory AC Characteristics, M48T248V Symbol t t READ Cycle Time AVAV Access Time AVQV ACC t t Chip Enable Low to Output Valid ELQV Output Enable Low to Output Valid GLQV OE t ELQX t Chip Enable or Output Enable Low to Output Transition COE ...
Page 11
... OE pin or the WE pin. Cycles to other locations outside the memory block can be interleaved with CE cycles without interrupting the pattern recognition sequence or data transfer se- quence to the Phantom Clock. M48T248Y, M48T248V is absent or unstable first applied at a level greater than CC is present). ...
Page 12
... M48T248Y, M48T248V Figure 8. Comparison Register Definition 7 BYTE 0 1 BYTE 1 0 BYTE BYTE 3 BYTE BYTE 5 BYTE 6 1 BYTE 7 0 Note: The odds of this pattern being accidentally duplicated and sending aberrant entries to the RTC is less than sent to the clock LSB to MSB. ...
Page 13
... D3 D2 0.01 Seconds Seconds Minutes 10 / Hrs Hours (24 Hour Format) A/P OSC RST 0 Day of the Week 10 date Date: Day of the Month 0 10M Month RST = Reset Bit 0 = Must be set to '0' M48T248Y, M48T248V Function/Range BCD Format D1 D0 Seconds Seconds Minutes Hours Day Date Month Year Year 00-99 00-59 00-59 01-12/ 00-23 01-7 ...
Page 14
... M48T248Y, M48T248V Figure 9. Phantom Clock READ Cycle tCOE Q Figure 10. Phantom Clock WRITE Cycle Figure 11. Phantom Clock Reset RST 14/24 tRC tCW tCO tOW tOE tOEE DATA OUTPUT VALID tWC tWP tCW tDS DATA INPUT STABLE tRST tRR tOD tODO ...
Page 15
... Table 6. Phantom Clock AC Characteristics (M48T248Y) Symbol t t READ Cycle Time AVAV Access Time ELQV Access Time GLQV Output Low Z ELQX COE Output Low Z GLQX OEE ( Output High Z t EHQZ OD ( Output High Z ...
Page 16
... M48T248Y, M48T248V Table 7. Phantom Clock AC Characteristics (M48T248V) Symbol t t READ Cycle Time AVAV Access Time ELQV Access Time GLQV Output Low Z ELQX COE Output Low Z GLQX OEE ( Output High Z t EHQZ ...
Page 17
... Exposure to Absolute Maximum Rat- ing conditions for extended periods may affect de- vice reliability. STMicroelectronics SURE Program and other rel- evant quality documents. Parameter , Oscillator Off) CC M48T248Y M48T248V –0 M48T248Y, M48T248V Refer also to Value Unit °C – °C 260 °C – ...
Page 18
... M48T248Y, M48T248V DC AND AC PARAMETERS This section summarizes the operating and mea- surement conditions, as well as the DC and AC characteristics of the device. The parameters in the following DC and AC Characteristic tables are derived from tests performed under the Measure- Table 9. DC and AC Measurement Conditions Parameter V Supply Voltage ...
Page 19
... OUT – 0.2 3 CCI –0 –1.0 mA 2.4 OH 4.25 4.37 V BAT = 0 to 70° 4.5 to 5.5V or 3.0 to 3.6V (except where noted M48T248Y, M48T248V M48T248V –85 Max Min Typ Max ±1 ±1 ±1 ± 0.8 –0 0.3 2 0.4 ...
Page 20
... M48T248Y, M48T248V Figure 13. Power Down/Up Mode AC Waveforms PFD (max) V PFD (min tPD CE Table 12. Power Down/Up Trip Points DC Characteristics Symbol t V (max low REC PFD t V (max PFD t V (min PFD (min PFD t CE High to Power-Fail ...
Page 21
... Typ Min Max 9.27 9.52 0.38 – 0.43 0.59 0.20 0.33 42.42 43.18 18.03 18.80 2.29 2.79 34.29 41.91 14.99 16.00 3.05 3.81 1.91 2.79 32 M48T248Y, M48T248V C eA PMDIP inches Typ Min Max 0.365 0.375 0.015 – 0.017 0.023 0.008 0.013 1.670 1.700 0.710 0.740 0.090 0.110 1.350 1.650 0.590 0.630 0.120 0.150 0.075 0.110 32 21/24 ...
Page 22
... CC PFD 248V = V = 3.0 to 3.6V 2.80 to 2.97V CC PFD Speed –70 = 70ns (M48T248Y) –85 = 85ns (M48T248V) Package PM = PMDIP32 Temperature Range 70°C Shipping Method for SOIC blank = Tubes TR = Tape & Reel For other options, or for more information on any aspect of this device, please contact the ST Sales Office nearest you ...
Page 23
... REVISION HISTORY Table 15. Document Revision History Date Version June 2001 1.0 First Issue 28-Mar-03 2.0 v2.2 template applied; test condition updated (Table 12) 22-Feb-05 3.0 Reformatted; IR reflow update (Table 8) M48T248Y, M48T248V Revision Details 23/24 ...
Page 24
... M48T248Y, M48T248V Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice ...