M48T59 ST Microelectronics, M48T59 Datasheet
M48T59
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M48T59 Summary of contents
Page 1
... REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT and BATTERY FREQUENCY TEST OUTPUT for REAL TIME CLOCK SOFTWARE CALIBRATION AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION WRITE PROTECT VOLTAGES (V = Power-fail Deselect Voltage): PFD – M48T59: 4.5V V 4.75V PFD – M48T59Y: 4.2V V PFD – M48T59V: 2.7V V PFD ...
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... M48T59, M48T59Y, M48T59V Figure 2A. DIP Connections RST 1 A12 M48T59 A2 8 M48T59Y DQ0 11 DQ1 12 DQ2 AI01381D Table 2. Absolute Maximum Ratings Symbol T Ambient Operating Temperature A T Storage Temperature (V STG (2) Lead Solder Temperature for 10 seconds ...
Page 3
... The 28 pin 600mil DIP CAPHAT™ houses the M48T59/59Y/59V silicon with a quartz crystal and a long life lithium button cell in a single package. The 28 pin 330mil SOIC provides sockets with gold plated contacts at both ends for direct con- nection to a separate SNAPHAT housing contain- ing the battery and crystal ...
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... M48T59, M48T59Y, M48T59V (1, 2) Table 5. Capacitance ( °C) A Symbol Parameter C Input Capacitance IN (3) Input / Output Capacitance C IO Note: 1. Effective capacitance measured with power supply at 5V. 2. Sampled only, not 100% tested. 3. Outputs deselected. Table 6. DC Characteristics ( °C or – °C; V ...
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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 M48T59/59Y/59V are integrated on one silicon chip. Parameter (min) V Fall Time ...
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... M48T59, M48T59Y, M48T59V Table 9. Read Mode AC Characteristics ( °C or – ° Symbol t Read Cycle Time AVAV (1) Address Valid to Output Valid t AVQV (1) Chip Enable Low to Output Valid t ELQV (1) Output Enable Low to Output Valid t GLQV (2) Chip Enable Low to Output Transition ...
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... CC Parameter READ MODE The M48T59/59Y/59V is in the Read Mode when- ever W (Write Enable) is high and E (Chip Enable) is low. The unique address specified by the 13 Ad- dress Inputs defines which one of the 8,192 bytes of data accessed. Valid data will be avail- ...
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... M48T59, M48T59Y, M48T59V Figure 7. Write Enable Controlled, Write AC Waveform A0-A12 E W DQ0-DQ7 Figure 8. Chip Enable Controlled, Write AC Waveforms A0-A12 E W DQ0-DQ7 8/21 tAVAV VALID tAVWH tAVEL tWLWH tAVWL tWLQZ tAVAV VALID tAVEH tAVEL tELEH tAVWL tDVEH tWHAX tWHQX tWHDX DATA INPUT tDVWH ...
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... WRITE MODE The M48T59/59Y/59V is in the Write Mode when- ever W and E are low. The start of a write is refer- enced 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 ...
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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 M48T59/59Y/ 59V for an accumulated period of at least 7 years when V is less than system power re- CC ...
Page 11
... The oscillator may be stopped at any time. If the device is going to spend a significant amount of time on the shelf, the oscillator can be turned off to minimize current drain on the battery. The STOP bit is the MSB of the seconds register. Setting '1' stops the oscillator. The M48T59/59Y/59V in the DIP package, is STMicroelectronics with the STOP bit set to a '1' ...
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... It can also be programmed to go off while the M48T59 is in the battery back-up mode of opera- tion to serve as a system wake-up call. RPT1-RPT4 put the alarm in the repeat mode of operation ...
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... AF. The user can read the Flag Register at system boot-up to determine if an alarm was generated while the M48T59 was in the deselect mode during power-up. Figure 12 illustrates the back-up mode alarm timing. Figure 12. Back-up Mode Alarm Waveforms ...
Page 14
... SNAPHAT top may be replaced while VCC is ap- plied to the device. Note: Battery monitoring is a useful technique only when performed periodically. The M48T59/59Y/ 59V only monitors the battery when a nominal VCC is applied to the device. Thus applications which require extensive durations in the battery ...
Page 15
... V connected anode 1N5817 is recommended for through hole and MBRS120T3 is recommended for surface mount Figure 13. Supply Voltage Protection bus. The energy to V (cathode Schottky diode SS M48T59, M48T59Y, M48T59V 0.1 F DEVICE V SS AI02169 15/21 ...
Page 16
... Shipping Method for SOIC blank = Tubes TR = Tape & Reel Note: 1. The M48T59 part is offered with the PCDIP28 (i.e. CAPHAT) package only. 2. The SOIC package (SOH28) requires the battery/crystal package (SNAPHAT) which is ordered separately under the part number "M4TXX-BR12SH1" in plastic tube or "M4TXX-BR12SH1TR" in Tape & Reel form. ...
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... Drawing is not to scale. mm Min Max 8.89 9.65 0.38 0.76 8.38 8.89 0.38 0.53 1.14 1.78 0.20 0.31 39.37 39.88 17.83 18.34 2.29 2.79 29.72 36.32 15.24 16.00 3.05 3. M48T59, M48T59Y, M48T59V 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 1.570 0.702 0.722 0.090 0.110 1.170 1.430 0.600 0.630 0.120 0.150 PCDIP 17/21 ...
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... M48T59, M48T59Y, M48T59V Table 16. SOH28 - 28 lead Plastic Small Outline, battery SNAPHAT, Package Mechanical Data Symb Typ 1. Figure 15. SOH28 - 28 lead Plastic Small Outline, battery SNAPHAT, Package Outline SOH-A Drawing is not to scale. 18/21 mm 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 – ...
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... Figure 16. M4T28-BR12SH SNAPHAT Housing for 48 mAh Battery & Crystal, Package Outline Drawing is not to scale. 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. M48T59, M48T59Y, M48T59V 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 0.612 0.628 0.126 0.142 0.080 0.090 SHTK-A ...
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... M48T59, M48T59Y, M48T59V Table 18. M4T32-BR12SH SNAPHAT Housing for 120mAh Battery & Crystal, Package Mechanical Data Symb Typ Figure 17. M4T32-BR12SH SNAPHAT Housing for 120mAh Battery & Crystal, Package Outline Drawing is not to scale. 20/21 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. inches ...
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