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M48T129V-70PM1 Datasheet(PDF) 8 Page - STMicroelectronics |
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M48T129V-70PM1 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 22 page M48T129Y, M48T129V 8/22 Table 7. Power Down/Up Trip Points DC Characteristics (1) (TA = 0 to 70 °C) Note: 1. All voltages referenced to VSS. 2. At 25 °C. Table 8. Power Down/Up AC Characteristics (TA = 0 to 70 °C) Note: 1. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 50µs after VCC passes VPFD (min). 2. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data. Symbol Parameter Min Typ Max Unit VPFD Power-fail Deselect Voltage M48T129Y 4.2 4.35 4.5 V M48T129V 2.7 2.9 3.0 V VSO Battery Back-up Switchover Voltage M48T129Y 3.0 V M48T129V VPFD –100mV V tDR (2) Expected Data Retention Time 10 YEARS Symbol Parameter Min Max Unit tF (1) VPFD (max) to VPFD (min) VCC Fall Time 300 µs tFB (2) VPFD (min) to VSS VCC Fall Time M48T129Y 10 µs M48T129V 150 µs tR VPFD (min) to VPFD (max) VCC Rise Time 10 µs tRB VSS to VPFD (min) VCC Rise Time 1 µs tREC VPFD (max) to RST High 40 200 ms Figure 6. Power Down/Up Mode AC Waveforms AI01805 VCC INPUTS OUTPUTS DON’T CARE HIGH-Z tF tFB tR tRB VALID VALID RECOGNIZED RECOGNIZED VPFD (max) VPFD (min) VSO tREC RST |
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