M48T37V-10MH1F STMicroelectronics, M48T37V-10MH1F Datasheet
M48T37V-10MH1F
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M48T37V-10MH1F Summary of contents
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... Watchdog timer ■ WRITE protect voltage (V = Power-fail deselect voltage): PFD – M48T37Y 4 4.2 V ≤ V ≤ 4.5 V PFD – M48T37V 3 2.7 V ≤ V ≤ 3.0 V PFD ■ Packaging includes a 44-lead SOIC and ® SNAPHAT top (to be ordered separately) ■ ...
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... Power-on reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.8 Programmable interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.9 Battery low flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.10 Initial power-on defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.11 V noise and negative going transients . . . . . . . . . . . . . . . . . . . . . . . . . Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 7 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 8 Environmental information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 2/30 Doc ID 7019 Rev 9 M48T37Y, M48T37V ...
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... M48T37Y, M48T37V List of tables Table 1. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 2. Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Table 3. READ mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 4. WRITE mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Table 5. Register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 6. Alarm repeat modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 7. Default values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 8. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 9. Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 10. Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 11. ...
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... SOH44 – 44-lead plastic small outline, 4-socket SNAPHAT Figure 15. SH – 4-pin SNAPHAT Figure 16. SH – 4-pin SNAPHAT Figure 17. Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4/30 ® housing for 48 mAh battery & crystal, pack. outline . . . . . . . . . . . 25 ® housing for 120 mAh battery & crystal, pack. outline . . . . . . . . . . 26 Doc ID 7019 Rev 9 M48T37Y, M48T37V ® outline ...
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... M48T37Y, M48T37V 1 Description The M48T37Y/V TIMEKEEPER clock. The monolithic chip is available in a special package which provides a highly integrated battery-backed memory and real-time clock solution. The 44-lead, 330 mil SOIC package provides sockets with gold-plated contacts at both ends for direct connection to a separate SNAPHAT housing containing the battery and crystal. ...
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... Chip enable Output enable WRITE enable Supply voltage Ground Not connected internally RST A14 5 40 A12 M48T37Y NC 12 M48T37V WDI DQ0 18 27 DQ1 19 26 DQ2 Doc ID 7019 Rev 9 M48T37Y, M48T37V IRQ/FT W A13 A8 A9 A11 A10 E NC DQ7 DQ6 DQ5 DQ4 DQ3 NC AI02174 ...
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... M48T37Y, M48T37V Figure 3. Block diagram 32,768 Hz CRYSTAL LITHIUM CELL IRQ/FT WDI OSCILLATOR AND CLOCK CHAIN POWER VOLTAGE SENSE V PFD AND SWITCHING CIRCUITRY V CC RST Doc ID 7019 Rev 9 Description BiPORT SRAM ARRAY A0-A14 32,752 x 8 DQ0-DQ7 SRAM ARRAY AI03253 7/30 ...
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... (min PFD (1) ≤ for details. = Battery backup switchover voltage. ) after the last address input signal is stable, providing that the E AVQV Doc ID 7019 Rev 9 M48T37Y, M48T37V 13). The clock locations contain the is out falls below the DQ0-DQ7 Power X High Z Standby V D Active IL ...
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... M48T37Y, M48T37V met, valid data will be available after the latter of the chip enable access time (t output enable access time (t The state of the eight three-state data I/O signals is controlled by E and G. If the outputs are activated before t If the address inputs are changed while E and G remain active, output data will remain valid for output data hold time (t Figure 4 ...
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... W falls. WLQZ tAVAV VALID tAVWH tAVEL tWLWH tAVWL tWLQZ tAVAV VALID tAVEH tAVEL tELEH tAVWL tDVEH Doc ID 7019 Rev 9 M48T37Y, M48T37V from WRITE enable prior WHAX prior to the DVWH tWHAX tWHQX tWHDX DATA INPUT tDVWH tEHAX tEHDX DATA INPUT AI00926 AI00927 ...
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... M48T37Y, M48T37V Table 4. WRITE mode AC characteristics Symbol t WRITE cycle time AVAV t Address valid to WRITE enable low AVWL t Address valid to chip enable low AVEL t WRITE enable pulse width WLWH t Chip enable low to chip enable high ELEH t WRITE enable high to address transition WHAX ...
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... When reset to a '0,' the M48T37Y/V oscillator starts within one second. Note not necessary to set the WRITE bit when setting or resetting the FREQUENCY TEST bit (FT) or the STOP bit (ST). 12/30 ® registers should be halted before clock data is read to Doc ID 7019 Rev 9 M48T37Y, M48T37V Table 5 on page 13). ...
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... M48T37Y, M48T37V Table 5. Register map Address D7 7FFFh 7FFEh 0 7FFDh 0 7FFCh 0 7FFBh 0 7FFAh 0 7FF9h ST 7FF8h W 7FF7h WDS 7FF6h AFE 7FF5h RPT4 7FF4h RPT3 7FF3h RPT2 7FF2h RPT1 7FF1h 7FF0h WDF Keys Sign bit FT = Frequency test bit R = READ bit W = WRITE bit ST = Stop bit ...
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... ADDRESS 7FF0h 15ns Min RPT3 RPT2 RPT1 Doc ID 7019 Rev 9 M48T37Y, M48T37V Table 6 shows the possible Alarm activated 1 Once per second 0 Once per minute 0 Once per hour 0 Once per day 0 Once per month Figure 7. AI01677B ...
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... M48T37Y, M48T37V Figure 8. Backup mode alarm waveforms PFD (max) V PFD (min ABE, AFE bit in Interrupt Register AF bit in Flags Register IRQ/FT 3.5 Calibrating the clock The M48T37Y/V is driven by a quartz controlled oscillator with a nominal frequency of 32,768 Hz. The devices are tested not to exceed ±35 ppm (parts per million) oscillator frequency error at 25 ° ...
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... The watchdog timer resets when the microprocessor performs a re-write of the watchdog register or an edge transition (low to high / high to low) on the WDI pin occurs. The timeout period then starts over. 16/30 Figure 9 on page Doc ID 7019 Rev 9 M48T37Y, M48T37V 1 / second, 16 19. . The watchdog ...
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... M48T37Y, M48T37V The watchdog timer is disabled by writing a value of 00000000 to the eight bits in the watchdog register. Should the watchdog timer time out, a value of 00h needs to be written to the watchdog register in order to clear the IRQ/FT pin. The watchdog function is automatically disabled upon power-down and the watchdog register is cleared ...
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... V 18/30 is applied to the device applied to the device. Thus applications ® ( bus. These transients can be reduced if CC that drive it to values below V CC Doc ID 7019 Rev 9 M48T37Y, M48T37V Table 7). Watchdog AFE ABE (1) register bus. The energy stored in the much as SS ...
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... M48T37Y, M48T37V one volt. These negative spikes can cause data corruption in the SRAM while in battery backup mode. To protect from these voltage spikes recommended to connect a Schottky diode from V 1N5817 is recommended for through hole and MBRS120T3 is recommended for surface mount. Figure 9. Supply voltage protection Figure 10 ...
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... Do NOT wave solder SOIC to avoid damaging SNAPHAT 20/30 Parameter Grade 1 Grade 6 ® SNAPHAT off, CC SOH44 M48T37Y M48T37V M48T37Y M48T37V ® sockets. Doc ID 7019 Rev 9 M48T37Y, M48T37V Value Unit °C – °C – °C –55 to 150 °C 260 °C –0 –0.3 to 4.6 V – ...
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... Load capacitance (C Input rise and fall times Input pulse voltages Input and output timing ref. voltages Note: Output Hi-Z is defined as the point where data is no longer driven. Figure 12. AC testing load circuit for M48T37V. Note: Excluding open-drain output pins Table 10. Capacitance Symbol C ...
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... OUT CC Outputs open – 0 –0 – °C or – ° through a 100 kΩ resistor. tFB tDR DON'T CARE HIGH-Z Doc ID 7019 Rev 9 M48T37Y, M48T37V M48T37Y M48T37V –70 –100 Max Min Max ±1 ±1 ±1 ± 0.8 –0.3 0 0 0.4 ...
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... M48T37Y, M48T37V Table 12. Power down/up AC characteristics Symbol ( PFD ( PFD PFD ( REC PFD 1. Valid for ambient operating temperature: T (except where noted (max PFD PFD until 200 µs after (min PFD (min for industrial temperature range - grade 6 device. REC Table 13. Power down/up trip points DC characteristics ...
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... Doc ID 7019 Rev 9 M48T37Y, M48T37V ® outline ® , package inches Typ Min 0.002 0.092 0.014 0.006 0.697 0.324 0.032 – 0.126 0.453 0.016 0° ...
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... M48T37Y, M48T37V Figure 15. SH – 4-pin SNAPHAT Note: Drawing is not to scale. Table 15. SH – 4-pin SNAPHAT mechanical data Symbol ® housing for 48 mAh battery & crystal, pack. outline ® housing for 48 mAh battery & crystal, package mm Typ Min Max 9.78 6.73 7 ...
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... Min Max 10.54 8.00 8.51 7.24 8.00 0.38 0.46 0.56 21.21 21.84 17.27 18.03 15.55 15.95 3.20 3.61 2.03 2.29 Doc ID 7019 Rev 9 M48T37Y, M48T37V inches Typ Min 0.315 0.285 0.018 0.835 0.680 0.612 0.126 0.080 SHTK-A Max 0.415 .0335 0.315 ...
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... M48T37Y, M48T37V 7 Part numbering Table 17. Ordering information scheme Example: Device type M48T Supply voltage and write protect voltage 37Y = V = 4 37V = V = 3 Speed – (37Y) –10 = 100 ns (37V) Package ( SOH44 Temperature range °C ( – °C Shipping method blank = tubes (not for new design - use E) ® ...
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... Recycle or dispose of batteries in accordance with the battery manufacturer's instructions and local/national disposal and recycling regulations. Please refer to the following web site address for additional information regarding compliance statements and waste recycling www.st.com/rtc, then select "Lithium Battery Recycling" from "Related Topics". 28/30 Doc ID 7019 Rev 9 M48T37Y, M48T37V ...
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... M48T37Y, M48T37V 9 Revision history Table 19. Document revision history Date Revision Dec-1999 07-Feb-2000 11-Jul-2000 19-Jun-2001 06-Aug-2001 15-Jan-2002 20-May-2002 31-Mar-2003 01-Apr-2004 08-Feb-2006 03-Aug-2007 24-Mar-2009 02-Aug-2010 1 First issue From preliminary data to datasheet; battery low flag paragraph 2 changed; 100 ns speed class identifier changed 2.1 t changed (Table ) ...
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... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 30/30 Please Read Carefully: © 2010 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com Doc ID 7019 Rev 9 M48T37Y, M48T37V ...