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M48T59V-70MH1 Datasheet(PDF) 5 Page - STMicroelectronics |
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M48T59V-70MH1 Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 21 page 5/21 M48T59, M48T59Y, M48T59V Table 8. Power Down/Up AC Characteristics (TA = 0 to 70 °C or –40 to 85 °C) Note: 1. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200µs after VCC pass- es VPFD (min). 2. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data. 3. tREC (min) = 20ms for industrial temperature grade 6 device. Symbol Parameter Min Max Unit tPD E or W at VIH before Power Down 0 µs tF (1) VPFD (max) to VPFD (min) VCC Fall Time 300 µs tFB (2) VPFD (min) to VSS VCC Fall Time M48T59/Y 10 µs M48T59V 150 µs tR VPFD (min) to VPFD (max) VCC Rise Time 10 µs tRB VSS to VPFD (min) VCC Rise Time 1µs tREC (3) VPFD (max) to RST High 40 200 ms Figure 5. Power Down/Up Mode AC Waveforms AI03258 VCC INPUTS RST OUTPUTS DON'T CARE HIGH-Z tF tFB tR tREC tRB tDR VALID VALID VPFD (max) VPFD (min) VSO tPD RECOGNIZED RECOGNIZED (PER CONTROL INPUT) (PER CONTROL INPUT) The SOIC and battery/crystal packages are shipped separately in plastic anti-static tubes or in Tape & Reel form. For the 28 lead SOIC, the bat- tery/crystal package (i.e. SNAPHAT) part number is "M4T28-BR12SH" or “M4T32-BR12SH”. 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. The two circuits are interconnected at the upper eight memory locations to provide user accessible BYTEWIDE™ clock information in the bytes with addresses 1FF8h-1FFFh. The clock locations contain the century, year, month, date, day, hour, minute, and second in 24 hour BCD format (except for the century). Corrections for 28, 29 (leap year), 30, and 31 day months are made automatically. Byte 1FF8h is the clock control register. This byte controls user access to the clock information and also stores the clock calibration setting. |
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