M48T35AV-10PC1 STMicroelectronics, M48T35AV-10PC1 Datasheet
M48T35AV-10PC1
Specifications of M48T35AV-10PC1
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M48T35AV-10PC1 Summary of contents
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... Write protect voltages (V = Power-fail deselect voltage): PFD – M48T35AY 4 4.2 V ≤ V ≤ 4.5 V PFD – M48T35AV 3 2.7 V ≤ V ≤ 3.0 V PFD ■ Self-contained battery and crystal in the ™ CAPHAT DIP package ■ SOIC package provides direct connection for a ® ...
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... Stopping and starting the oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.4 Calibrating the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.5 Century bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.6 V noise and negative going transients . . . . . . . . . . . . . . . . . . . . . . . . . Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 7 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 8 Environmental information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 2/29 Doc ID 6845 Rev 8 M48T35AV ...
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... M48T35AV 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 6. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 7. Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 8. Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 9. DC characteristics Table 10. Power down/up AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 11. Power down/up trip points DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 12. PCDIP28 – ...
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... SOH28 – 28-lead plastic small outline, 4-socket battery SNAPHAT Figure 16. SH – 4-pin SNAPHAT Figure 17. SH – 4-pin SNAPHAT Figure 18. Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4/29 ® housing for 48 mAh battery & crystal, pack. outline . . . . . . . . . . . 24 ® housing for 120 mAh battery & crystal, pack. outline . . . . . . . . . . 25 Doc ID 6845 Rev 8 M48T35AV ® , package outline . . . 23 ...
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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 M48T35AV is a 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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... Ground A14 A12 A13 A11 M48T35AV A10 DQ7 DQ0 11 18 DQ6 DQ1 12 17 DQ5 DQ2 13 16 DQ4 DQ3 A14 A12 A13 A11 M48T35AV A10 DQ7 DQ0 11 18 DQ6 DQ1 12 17 DQ5 DQ2 13 16 DQ4 DQ3 Doc ID 6845 Rev 8 M48T35AV AI02798B AI02799 ...
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... M48T35AV 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 6845 Rev 8 Description BiPORT SRAM ARRAY A0-A14 DQ0-DQ7 32,760 x 8 SRAM ARRAY AI01623 V SS 7/29 ...
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... SO 2.1 READ mode The M48T35AV is in 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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... AVQV ) but will go indeterminate until the next address access. AXQX tAVAV VALID tAVQV tELQV tELQX tGLQV tGLQX (1) Parameter = ° Doc ID 6845 Rev 8 Operation modes tGHQZ VALID M48T35AV –100 Min Max 100 100 100 3.0 to 3.6 V (except where noted AVQV tAXQX tEHQZ ...
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... Operation modes 2.2 WRITE mode The M48T35AV is in 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 M48T35AV 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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... AT ANY ADDRESS WRITE DATA COMPLEMENT BACK TO SAME ADDRESS READ DATA AT SAME ADDRESS AGAIN IS DATA NO (BATTERY LOW) COMPLEMENT OF FIRST READ? NOTIFY SYSTEM (BATTERY OK) YES OF LOW BATTERY (DATA MAY BE CORRUPTED) WRITE ORIGINAL DATA BACK TO SAME ADDRESS CONTINUE Doc ID 6845 Rev 8 M48T35AV Figure 8 AI00607 ...
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... The STOP bit is the MSB of the seconds register. Setting '1' stops the oscillator. The M48T35AV is shipped from STMicroelectronics with the STOP bit set to a '1.' When reset to a '0,' the M48T35AV oscillator starts within 1 second. ...
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... CEB. 3.4 Calibrating the clock The M48T35AV 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°C, which equates to about ±1.53 minutes per month. With the calibration bits properly set, the accuracy of each M48T35AV improves to better than +1/– ...
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... Two methods are available for ascertaining how much calibration a given M48T35AV 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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... Clock operations Figure 9. Crystal accuracy across temperature ppm 20 0 -20 -40 -60 -80 -100 0 Figure 10. Clock calibration NORMAL POSITIVE CALIBRATION NEGATIVE CALIBRATION 16/29 ΔF = -0.038 ppm 2 ± 10 ° Doc ID 6845 Rev M48T35AV °C AI02124 AI00594B ...
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... M48T35AV 3.6 V noise and negative going transients CC I transients, including those produced by output switching, can produce voltage CC fluctuations, resulting in spikes on the V capacitors are used to store energy which stabilizes the V bypass capacitors will be released as low going spikes are generated or energy will be absorbed when overshoots occur. A bypass capacitor value of 0.1 µF (as shown in Figure 11) is recommended in order to provide the needed filtering ...
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... Negative undershoots below –0.3 V are not allowed on any pin while in the battery backup mode. Caution: Do NOT wave solder SOIC to avoid damaging SNAPHAT 18/29 Parameter off, oscillator off) CC ® sockets. Doc ID 6845 Rev 8 M48T35AV Value Unit °C – °C 260 °C –0.3 to 4.6 V – ...
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... Effective capacitance measured with power supply sampled only, not 100% tested ° MHz. 3. Outputs deselected. Parameter ) DEVICE UNDER TEST 50pF (or 5pF includes JIG capacitance (1)(2) Parameter Doc ID 6845 Rev 8 DC and AC parameters M48T35AV 3 ≤ 1.5 1.75V Min Max - Unit V ° ...
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... ≤ V ≤ V OUT CC Outputs open – – ° 3.0 to 3.6 V (except where noted tFB tRB tDR DON'T CARE HIGH-Z Doc ID 6845 Rev 8 M48T35AV M48T35AV Unit Min Max ±1 µA ±1 µ –0.3 0 0 trec RECOGNIZED VALID ...
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... M48T35AV Table 10. Power down/up AC characteristics Symbol before power down (max PFD PFD (3) V (min PFD (min PFD PFD (min PFD t V (max) to inputs recognized rec PFD 1. Valid for ambient operating temperature: T noted (max (min) fall time of less than t PFD PFD ...
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... Doc ID 6845 Rev 8 M48T35AV C eA PCDIP inches Typ Min Max 0.350 0.380 0.015 0.030 0.330 0.350 0.015 0.021 0.045 0.070 0.008 0.012 1.550 1 ...
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... M48T35AV Figure 15. SOH28 – 28-lead plastic small outline, 4-socket battery SNAPHAT package outline B Note: Drawing is not to scale. Table 13. SOH28 – 28-lead plastic small outline, 4-socket battery SNAPHAT mech. data Symb Typ Min Max 3.05 0.05 0.36 2.34 2.69 0.36 0.51 0.15 ...
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... Typ Min Max 9.78 6.73 7.24 6.48 6.99 0.38 0.46 0.56 21.21 21.84 14.22 14.99 15.55 15.95 3.20 3.61 2.03 2.29 Doc ID 6845 Rev 8 M48T35AV inches Typ Min Max 0.385 0.265 0.285 0.255 0.275 0.015 0.018 0.022 0.835 0.860 0.560 0.590 ...
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... M48T35AV Figure 17. SH – 4-pin SNAPHAT Note: Drawing is not to scale. Table 15. SH – 4-pin SNAPHAT data Symb ® housing for 120 mAh battery & crystal, pack. outline ® housing for 120 mAh battery & crystal, pack. mech. mm Typ Min Max 10.54 8 ...
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... Table ® battery package “M4TXX-BR12SH” in conductive foam as it ® battery table Description Lithium battery (48 mAh) SNAPHAT Lithium battery (120 mAh) SNAPHAT Lithium battery (120 mAh) SNAPHAT Doc ID 6845 Rev 8 M48T35AV – 17). Package ® SH ® SH ® ...
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... M48T35AV 8 Environmental information Figure 18. Recycling symbols This product contains a non-rechargeable lithium (lithium carbon monofluoride chemistry) button cell battery fully encapsulated in the final product. 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 " ...
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... Table 16, 17; removed M48T35AY and all references. Updated Table 6, Section 6: Package mechanical 7 Section 8: Environmental 8 Updated Section 4, Table Doc ID 6845 Rev 8 Changes (Table 10, (Table 6) (Table (Table Section 6: Package mechanical data; added information; minor formatting changes. 12; reformatted document. M48T35AV 11) 6, 16) data, ...
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... M48T35AV Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...