M48T559 ST Microelectronics, M48T559 Datasheet
M48T559
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M48T559 Summary of contents
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... CIRCUIT and BATTERY FREQUENCY TEST OUTPUT for REAL TIME CLOCK AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION WRITE PROTECT VOLTAGE (V = Power-fail Deselect Voltage): PFD – M48T559Y: 4.2V V PFD PACKAGING INCLUDES a 28-LEAD SOIC ® and SNAPHAT TOP (to be Ordered Separately) SOIC PACKAGE PROVIDES DIRECT ...
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... Caution: Do not place the SNAPHAT battery/crys- tal top in conductive foam, as this will drain the lith- ium button-cell battery. As Figure 3 shows, the static memory array and the quartz controlled clock oscillator of the M48T559Y are integrated on one silicon chip. The 2/18 Table 1. Signal Names AD0-AD7 AS0-AS1 ...
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... The information can be accessed by the user in the same manner as any other location in the static memory array. The M48T559Y also has its own Power-fail Detect circuit. The control circuitry constantly monitors the single 5V supply for an out of tolerance condi- tion ...
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... M48T559Y Table 4. AC Measurement Conditions Input Rise and Fall Times Input Pulse Voltages Input and Output Timing Ref. Voltages Note that Output Hi-Z is defined as the point where data is no longer driven. (1, 2) Table 5. Capacitance ( ° MHz) A Symbol Parameter C Input Capacitance ...
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... V F may cause corruption of RAM data. FB tDR tFB (1) Min Typ Max 4.2 4.35 4.5 3.0 7 Min Max 0 300 200 tR tRB tREC DON'T CARE RECOGNIZED HIGH-Z VALID (PER CONTROL INPUT) M48T559Y Unit V V YEARS Unit µs µs µs µs µs ms pass- CC AI01384D 5/18 ...
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... Chip Enable Low to Write Enable Low ELWL RAM OPERATION Four control signals, AS0, AS1, R and W, are used to access the M48T559Y. The address latches are loaded from the address/data bus in response to rising edge signals applied to the Address Strobe 0 (AS0) and Address Strobe 1 (AS1) signals. AS0 is used to latch the lower 8 bits of address, and AS1 is used to latch the upper 5 bits of address ...
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... LOW ADDRESS VALID UPPER ADDRESS VALID tASLASH tAS tAH tAS LOW ADDRESS VALID UPPER ADDRESS VALID tELEH tELRL tASLASH tASHRL tRLRH tRLDV tAH DATA OUT VALID AI01671B tELEH tELWL tASLASH tASHWL tWLWH tAH tDS DATA IN VALID AI01672B M48T559Y tEHDZ tRHDZ tEHDZ tDH 7/18 ...
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... When V drops below switches power to the internal battery which pre- serves data and powers the clock. The internal button cell will maintain data in the M48T559Y for an accumulated period of at least 7 years when V is less than system power returns CC SO ...
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... MSB of the seconds register. Setting ’1’ stops the oscillator. The M48T559Y is shipped from STMicroelectronics with the STOP bit set to a ’1’. When reset to a ’0’, the M48T559Y oscillator starts within one second. Calibrating the Clock The M48T559Y is driven by a quartz controlled os- cillator with a nominal frequency of 32,768Hz ...
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... Calibration byte would represent +10.7 or -5.35 seconds per month which corresponds to a total range of +5 2.75 minutes per month. Two methods are available for ascertaining how much calibration a given M48T559Y may require. 10/ -0.038 ppm ...
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... The alarm can be configured to go off at a prescribed time on a specific day of the month or repeat every day, hour, minute, or second. It can also be programmed to go off while the M48T559Y is in the battery back-up mode of operation to serve as a system wake-up call. RPT1-RPT4 put the alarm in the repeat mode of operation ...
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... Note: Accuracy of timer is within ± the selected resolution. If the processor does not reset the timer within the specified period, the M48T559Y sets the WDF (Watchdog Flag) and generates a watchdog inter- rupt or a microprocessor reset. WDF is reset by reading the Flags Register (Address 1FF0h). ...
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... RSTIN1 High to RST Hi-Z R1HRZ t RSTIN2 High to RST Hi-Z R2HRZ BATTERY LOW WARNING The M48T559Y checks its battery voltage on pow- er-up. The BL (Battery Low) bit (D4 of 1FF0h) will be set on power-up if the battery voltage is less than 2.5V (typical). POWER-ON DEFAULTS Upon application of power to the device, the fol- lowing register bits are set to a ’ ...
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... Table 14. Revision History Date June 1998 First Issue Description Paragraph changed Setting Alarm Clock paragraph changed 02/07/00 M4T28-BR12SH SNAPHAT Housing for 48mAh Battery & Crystal Package added (Table 16) Power Down/Up Mode AC Waveforms changed (Figure 5) Back-up Mode Alarm Waveforms changed (Figure 11) 14/18 M48T559Y Revision Details ...
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... Min Max 3.05 0.05 0.36 2.34 2.69 0.36 0.51 0.15 0.32 17.71 18.49 8.23 8.89 – – 3.20 3.61 11.51 12.70 0.41 1.27 0° 8° M48T559Y inches Typ Min 0.002 0.092 0.014 0.006 0.697 0.324 0.050 – 0.126 0.453 0.016 0° Max 0.120 0.014 0.106 0.020 0.012 0.728 0.350 – 0.142 0.500 0.050 8° 0.004 ...
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... M48T559Y Table 16. M4T28-BR12SH SNAPHAT Housing for 48mAh Battery & Crystal, Package Mechanical Data Symb Typ Figure 15. M4T28-BR12SH SNAPHAT Housing for 48mAh Battery & Crystal, Package Outline Drawing is not to scale. 16/18 mm 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. inches Typ Min Max 0 ...
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... Figure 16. M4T28-BR12SH SNAPHAT Housing for 120mAh Battery & Crystal, Package Outline Drawing is not to scale. mm 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. M48T559Y inches Typ Min Max 0.415 0.315 0.335 0.285 0.315 0.015 0.018 0.022 0.835 0.860 0.680 0.710 0.612 0.628 0.126 0.142 0.080 0.090 SHTK-A ...
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... M48T559Y . 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 ...