M48T129 ST Microelectronics, M48T129 Datasheet
M48T129
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M48T129 Summary of contents
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... BCD CODED CENTURY, YEAR, MONTH, DAY, DATE, HOURS, MINUTES, and SECONDS BATTERY LOW WARNING FLAG AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION TWO WRITE PROTECT VOLTAGES Power-fail Deselect Voltage) PFD – M48T129Y: 4.2V V 4.5V PFD – M48T129V: 2.7V V 3.0V PFD CONVENTIONAL SRAM OPERATION; UNLIMITED WRITE CYCLES ...
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... Soldering temperature not to exceed 260 C for 10 seconds (total thermal budget not to exceed 150 C for longer than 30 seconds). CAUTION: Negative undershoots below –0.3V are not allowed on any pin while in the Battery Back-up mode. DESCRIPTION The M48T129Y/V TIMEKEEPER RAM is a 128Kb x 8 non-volatile static RAM and real time clock, with programmable alarms and a watchdog timer. ...
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... BiPORT read/write memory cells within the static RAM array. The M48T129Y/V includes a clock control circuit which updates the clock bytes with current infor- mation once per second. The information can be accessed by the user in the same manner as any other location in the static memory array ...
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... CELL 0.1 F Note: 1. For pin connections, see individual data sheets for M48T201Y/V and M68Z128/W at www.st.com. 2. For 5V, M48T129Y (M48T201Y + M68Z128). For 3.3V, M48T129V (M48T201V + M68Z128W). 3. SNAPHAT Top ordered separately. READ MODE The M48T129Y the Read Mode whenever W (Write Enable) is high and E (Chip Enable) is low ...
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... CC SO switches power to the internal battery, preserving data and powering the clock. The internal energy source will maintain data in the M48T129Y/V for an accumulated period of at least 10 years at room temperature. As system power rises above V the battery is disconnected, and the power supply is switched to external V ...
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... It can also be pro- grammed to go off while the M48T129Y the battery back-up to serve as a system wake-up call. Bits RPT5-RPT1 put the alarm in the repeat mode of operation ...
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... MHz) A Symbol Parameter C Input Capacitance IN (2) Input / Output Capacitance C IO Note: 1. Effective capacitance measured with power supply at 5V (M48T129Y) or 3.3V (M48T129V). Sampled only, not 100% tested. 2. Outputs deselected. Table 6A. DC Characteristics ( 4.5V to 5.5V Symbol Parameter (1) Input Leakage Current ...
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... M48T129Y, M48T129V Figure 6. Power Down/Up Mode AC Waveforms PFD (max) V PFD (min INPUTS RECOGNIZED OUTPUTS VALID RST Table 7. Power Down/Up Trip Points DC Characteristics ( Symbol Parameter V Power-fail Deselect Voltage PFD V Battery Back-up Switchover Voltage SO (2) Expected Data Retention Time ...
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... C = 5pF. L Figure 7. Address Controlled, Read Mode AC Waveforms A0-A16 tAXQX DQ0-DQ7 DATA VALID M48T129Y -70 Min Max tAVAV VALID tAVQV DATA VALID M48T129Y, M48T129V M48T129V -85 Unit Min Max AI02324 ...
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... Watchdog Register = 3 seconds). Note: Accuracy of timer is within resolution. If the processor does not reset the timer within the specified period, the M48T129Y/V sets the WDF (Watchdog Flag) and generates a watchdog inter- rupt or a microprocessor reset. WDF is reset by reading the Flags Register (Address 1FFF0h). The most significant bit of the Watchdog Register is the Watchdog Steering Bit (WDS). When set to a ’ ...
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... Figure 8. Chip Enable or Output Enable Controlled, Read Mode AC Waveforms A0-A16 E G DQ0-DQ7 Figure 9. Write Enable Controlled, Write AC Waveforms A0-A16 tAVEL E tAVWL W DQ0-DQ7 tAVAV VALID tAVQV tAXQX tELQV tELQX tGLQV tGLQX DATA OUT tAVAV VALID tAVWH tWLWH tWLQZ tWHDX DATA INPUT tDVWH M48T129Y, M48T129V tEHQZ tGHQZ AI01197 tWHAX tWHQX AI02382 11/22 ...
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... CC control the rise time. CALIBRATING THE CLOCK The M48T129Y/V is driven by a quartz controlled oscillator with a nominal frequency of 32,768Hz. The devices are factory calibrated and tested for accuracy. Clock accuracy will not ex- ceed 35 ppm (parts per million) oscillator frequen- cy error which equates to about * 1 ...
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... Alarm Flag WDS = Watchdog Steering Bit BMB0-BMB4 = Watchdog Multiplier Bits RB0-RB1 = Watchdog Resolution Bits AFE = Alarm Flag Enable ABE = Alarm in Battery Back-up Mode Enable RPT1-RPT5 = Alarm Repeat Mode Bits WDF = Watchdog Flag M48T129Y, M48T129V Function/Rang e BCD Format Year 00-99 Month 01-12 Date 01-31 ...
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... M48T129Y, M48T129V Figure 12. Alarm Interrupt Reset Waveform AD0-AD7 ACTIVE FLAG BIT IRQ/FT Figure 13. Back-up Mode Alarm Waveforms PFD (max) V PFD (min AFE bit in Interrupt Register AF bit in Flags Register IRQ/FT HIGH-Z Calibration values, including the number of sec- onds lost or gained in a given period, can be found in Application Note: TIMEKEEPER CALIBRA- TION ...
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... However, data is not com- promised due to the fact that a nominal V supplied. The M48T129Y/V only monitors the battery when a nominal V is applied to the device. Thus appli- CC cations which require extensive durations in the ...
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... M48T129Y, M48T129V Table 13. Ordering Information Scheme Example: Device Type M48T Supply Voltage and Write Protect Voltage 129Y = V = 4.5V to 5.5V 4.2V to 4.5V CC PFD 129V = V = 3.0V to 3.6V 2.7V to 3.0V CC PFD Speed -70 = 70ns -85 = 85ns Package PM = PMDIP32 ( Surface Mount Chip Set solution M48T201Y/V (SOH44) + M68Z128/W (TSOP32) Temperature Range Note: 1 ...
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... Drawing is not to scale. mm Min Max Typ 9.27 9.52 0.38 – 0.43 0.59 0.20 0.33 43.18 18.80 2.29 2.79 41.91 16.00 3.05 3.81 1.91 2. M48T129Y, M48T129V inches 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 PMDIP 17/22 ...
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... M48T129Y, M48T129V Table 16. TSOP32 - 32 lead Plastic Thin Small Outline 20mm, Package Mechanical Data Symbol Typ A A1 0.050 A2 0.950 B 0.150 C 0.100 D 19.800 D1 18.300 e 0.500 E 7.900 L 0.500 Figure 16. TSOP32 - 32 lead Plastic Thin Small Outline 20mm, Package Outline 1 N DIE TSOP-a Drawing is not to scale ...
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... Figure 17 4-pin SNAPHAT Housing for 48 mAh Battery & Crystal, Package Outline eA D Drawing is not to scale. mm Min Max Typ 9.78 6.73 7.24 6.48 6.99 0.38 0.46 0.56 21.84 14.99 15.95 3.20 3.61 2.03 2. M48T129Y, M48T129V inches 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 0.612 0.628 0.126 0.142 0.080 0.090 SHTK-A ...
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... M48T129Y, M48T129V Table 18 4-pin SNAPHAT Housing for 120 mAh Battery & Crystal, Package Mechanical Data Symb Typ 21.21 E 17.27 eA 15. Figure 18 4-pin SNAPHAT Housing for 120 mAh Battery & Crystal, Package Outline eA D Drawing is not to scale. 20/22 mm Min ...
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... Drawing is not to scale. mm Min Max Typ 3.05 0.05 0.36 2.34 2.69 0.36 0.46 0.15 0.32 18.49 8.23 8.89 – – 0.032 3.20 3.61 12.70 0. M48T129Y, M48T129V inches Min Max 0.120 0.002 0.014 0.092 0.106 0.014 0.018 0.006 0.012 0.697 0.728 0.324 0.350 – – 0.126 0.142 0.453 0.500 0.016 0.050 0.004 C L 21/22 ...
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... M48T129Y, M48T129V 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 ...