M48T35-70PC1 STMicroelectronics, M48T35-70PC1 Datasheet
M48T35-70PC1
Specifications of M48T35-70PC1
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M48T35-70PC1 Summary of contents
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... Frequency test output for real-time clock ■ Automatic power-fail chip deselect and WRITE protection ■ WRITE protect voltages V = Power-fail deselect voltage): PFD – M48T35 4. 4.5 V ≤ V ≤ 4.75 V PFD – M48T35Y 4 4.2 V ≤ V ≤ 4.5 V PFD ■ ...
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... Stopping and starting the oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.4 Calibrating the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.5 Century bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.6 V noise and negative going transients . . . . . . . . . . . . . . . . . . . . . . . . . Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 7 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 8 Environmental information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 2/28 Doc ID 2611 Rev 9 M48T35, M48T35Y ...
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... M48T35, M48T35Y 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. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 7. Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 8. Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 9. DC characteristics Table 10. Power down/up AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 11. ...
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... Figure 15. SH – 4-pin SNAPHAT Figure 16. SH – 4-pin SNAPHAT Figure 17. Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4/28 ® housing for 48 mAh battery & crystal, package outline ® housing for 120 mAh battery & crystal, package outline Doc ID 2611 Rev 9 M48T35, M48T35Y ® , package outline . . . 22 ...
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... The monolithic chip is available in two special packages to provide a highly integrated battery-backed memory and real-time clock solution. The M48T35 non-volatile pin and function equivalent to any JEDEC standard SRAM. It also easily fits into many ROM, EPROM, and EEPROM sockets, providing the non-volatility of PROMs without any requirement for special WRITE timing or limitations on the number of WRITEs that can be performed ...
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... A13 A11 M48T35 A10 M48T35Y DQ7 DQ0 11 18 DQ6 DQ1 12 17 DQ5 DQ2 13 16 DQ4 DQ3 A14 A12 A13 A11 M48T35Y A10 DQ7 DQ0 11 18 DQ6 DQ1 12 17 DQ5 DQ2 13 16 DQ4 DQ3 Doc ID 2611 Rev 9 M48T35, M48T35Y AI01621B AI01622B ...
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... M48T35, M48T35Y Figure 4. Block diagram 32,768 Hz CRYSTAL LITHIUM CELL OSCILLATOR AND CLOCK CHAIN POWER VOLTAGE SENSE V PFD AND SWITCHING CIRCUITRY V CC Doc ID 2611 Rev 9 Description BiPORT SRAM ARRAY A0-A14 DQ0-DQ7 32,760 x 8 SRAM ARRAY AI01623 7/28 ...
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... SO 2.1 READ mode The M48T35 the READ mode whenever W (WRITE enable) is high and E (chip enable) is low. The unique address specified by the 15 address inputs defines which one of the 32,768 bytes of data accessed. Valid data will be available at the data I/O pins within address access time (t the E and G access times are also satisfied ...
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... M48T35, M48T35Y If the address inputs are changed while E and G remain active, output data will remain valid for output data hold time (t Figure 5. READ mode AC waveforms A0-A14 E G DQ0-DQ7 Note: WRITE enable (W) = high. Table 3. READ mode AC characteristics Symbol t READ cycle time AVAV ...
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... Operation modes 2.2 WRITE mode The M48T35 the WRITE mode whenever W and E are low. The start of a WRITE is referenced from the latter occurring falling edge WRITE is terminated by the earlier rising edge The addresses must be held valid throughout the cycle must return high for a minimum the initiation of another READ or WRITE cycle ...
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... When V drops below V CC preserves data and powers the clock. The internal button cell will maintain data in the M48T35/Y for an accumulated period of at least 7 years when V system power returns and V supply is switched to external V plus t (min). E should be kept high as V rec WRITE cycles prior to processor stabilization ...
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... The STOP bit is the MSB of the seconds register. Setting '1' stops the oscillator. The M48T35/Y is shipped from STMicroelectronics with the STOP bit set to a '1.' When reset to a '0,' the M48T35/Y oscillator starts within 1 second. ...
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... Hz. The devices are tested not to exceed 35 ppm (parts per million) oscillator frequency error at 25 °C, which equates to about ±1.53 minutes per month. With the calibration bits properly set, the accuracy of each M48T35/Y improves to better than +1/–2 ppm at 25 °C. The oscillation rate of any crystal changes with temperature (see Most clock chips compensate for crystal frequency and temperature shift error with cumbersome “ ...
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... Two methods are available for ascertaining how much calibration a given M48T35/Y may require. The first involves simply setting the clock, letting it run for a month and comparing known accurate reference (like WWV broadcasts) ...
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... M48T35, M48T35Y Figure 8. Crystal accuracy across temperature ppm 20 0 -20 -40 -60 -80 -100 0 Figure 9. Clock calibration NORMAL POSITIVE CALIBRATION NEGATIVE CALIBRATION ΔF = -0.038 ppm 2 ± 10 ° Doc ID 2611 Rev 9 Clock operations °C AI02124 AI00594B 15/28 ...
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... MBRS120T3 is recommended for surface mount. Figure 10. Supply voltage protection 16/28 bus. These transients can be reduced if CC that drive it to values below (cathode connected 0.1µF Doc ID 2611 Rev 9 M48T35, M48T35Y bus. The energy stored in the much anode Schottky diode DEVICE V SS AI02169 ...
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... M48T35, M48T35Y 4 Maximum ratings Stressing the device above the rating listed in the absolute maximum ratings table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied ...
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... 100 L ≤ 1.5 5V 1.9kΩ DEVICE UNDER TEST 1kΩ 100pF or 5pF C L includes JIG capacitance (1)(2) Parameter Input capacitance Output capacitance Doc ID 2611 Rev 9 M48T35, M48T35Y M48T35Y 4.5 to 5.5 – 100 ≤ 1.5 OUT Min Max - Unit V ° AI01030 Unit ...
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... M48T35, M48T35Y Table 9. DC characteristics Symbol Parameter I Input leakage current LI (2) I Output leakage current LO I Supply current CC Supply current (standby) I CC1 TTL Supply current (standby) I CC2 CMOS V Input low voltage IL V Input high voltage IH V Output low voltage OL V Output high voltage OH 1 ...
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... Parameter M48T35 M48T35Y M48T35 M48T35Y Grade 1 Grade – ° ® only, M4T28-BR12SH1 SNAPHAT ® top (recommended for industrial temperature range - grade 6 device). Doc ID 2611 Rev 9 M48T35, M48T35Y Min Max 0 300 M48T35 10 M48T35Y 200 = 4. 4.5 to 5.5 V (except where CC Min ...
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... M48T35, M48T35Y 6 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ® ECOPACK trademark. Figure 13. PCDIP28 – 28-pin plastic DIP, battery CAPHAT™, package outline Note: Drawing is not to scale ...
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... Doc ID 2611 Rev 9 M48T35, M48T35Y C eB α ® , package inches Typ Min 0.002 0.092 0.014 0.006 0.697 0.324 0.050 – 0.126 0.453 0.016 0° ...
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... M48T35, M48T35Y Figure 15. SH – 4-pin SNAPHAT outline Note: Drawing is not to scale. Table 14. SH – 4-pin SNAPHAT mechanical data Symbol ® housing for 48 mAh battery & crystal, package ® housing for 48 mAh battery & crystal, package mm Typ Min Max 9.78 6.73 7 ...
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... Typ 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 3.20 3.61 2.03 2.29 Doc ID 2611 Rev 9 M48T35, M48T35Y inches Typ Min 0.315 0.285 0.018 0.835 0.680 0.126 0.080 SHTK Max 0.415 0.335 0.315 0.015 ...
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... ECOPACK 1. The M48T35 part is offered only in the PCDIP28 (i.e. CAPHAT™) package. 2. The M48T35Y is available only in the SOH28 (i.e. SNAPHAT SOIC) package. 3. The SOIC package (SOH28) requires the SNAPHAT separately under the part number “M4TXX-BR12SH” (see 4. Temperature grade 6 (–40 to +85 °C) devices are not for new design. Contact ST sales office for availability ...
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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". 26/28 Doc ID 2611 Rev 9 M48T35, M48T35Y ...
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... M48T35, M48T35Y 9 Revision history Table 18. Document revision history Date Revision Nov-1999 07-Feb-2000 04-Jun-2001 31-Jul-2001 06-Mar-2002 20-May-2002 26-Jun-2002 31-Mar-2003 10-Dec-2003 31-Mar-2004 05-Dec-2005 01-Aug-2007 12-Feb-2009 08-Sep-2010 1 First issue 1.1 t description changed (Table DR Reformatted; temp/voltage info. added to tables 2 add century bit text 2.1 Formatting changes based on latest document reviews Add PMDIP packaging option, which is “ ...
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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 28/28 Please Read Carefully: © 2010 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com Doc ID 2611 Rev 9 M48T35, M48T35Y ...