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M48T12-200PC1TR Datasheet(PDF) 11 Page - STMicroelectronics |
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M48T12-200PC1TR Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 19 page 11/19 M48T02, M48T12 Figure 10. Power Down/Up Mode AC Waveforms Note: Inputs may or may not be recognized at this time. Caution should be taken to keep E high as VCC rises past VPFD (min). Some systems may perform inadvertent WRITE cycles after VCC rises above VPFD (min) but before normal system operations begin. Even though a power on reset is being applied to the processor, a reset condition may not occur until after the system clock is running. Table 9. Power Down/Up AC Characteristics Note: 1. Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where noted). 2. 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). 3. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data. Table 10. Power Down/Up Trip Points DC Characteristics Note: 1. All voltages referenced to VSS. 2. Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where noted). 3. At 25°C; VCC = 0V. Symbol Parameter(1) Min Max Unit tPD E or W at VIH before Power Down 0µs tF (2) VPFD (max) to VPFD (min) VCC Fall Time 300 µs tFB (3) VPFD (min) to VSS VCC Fall Time 10 µs tR VPFD (min) to VPFD (max) VCC Rise Time 0µs tRB VSS to VPFD (min) VCC Rise Time 1µs tREC E or W at VIH before Power Up 2ms Symbol Parameter(1,2) Min Typ Max Unit VPFD Power-fail Deselect Voltage M48T02 4.5 4.6 4.75 V M48T12 4.2 4.3 4.5 V VSO Battery Back-up Switchover Voltage 3.0 V tDR (3) Expected Data Retention Time 10 YEARS AI00606 VCC INPUTS (PER CONTROL INPUT) OUTPUTS DON'T CARE HIGH-Z tF tFB tR tREC tPD tRB tDR VALID VALID NOTE (PER CONTROL INPUT) RECOGNIZED RECOGNIZED VPFD (max) VPFD (min) VSO |
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