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DS1646P Datasheet(PDF) 7 Page - Dallas Semiconductor |
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DS1646P Datasheet(HTML) 7 Page - Dallas Semiconductor |
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7 / 11 page  DS1646/DS1646P 7 of 11 AC ELECTRICAL CHARACTERISTICS (Over the Operating Range) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Read Cycle Time tRC 120 ns Address Access Time tAA 120 ns CE Access Time tCEA 120 ns CE Data Off Time tCEZ 40 ns Output Enable Access Time tOEA 100 ns Output Enable Data Off Time tOEZ 40 ns Output Enable to DQ Low-Z tOEL 5ns CE to DQ Low-Z tCEL 5ns Output Hold from Address tOH 5ns Write Cycle Time tWC 120 ns Address Setup Time tAS 0ns CE Pulse Width tCEW 100 ns Address Hold from End of Write tAH1 tAH2 5 30 ns ns 5 6 Write Pulse Width tWEW 75 ns WE Data Off Time tWEZ 40 ns WE or CE Inactive Time tWR 10 ns Data Setup Time tDS 85 ns Data Hold Time High tDH1 tDH2 0 25 ns ns 5 6 AC TEST CONDITIONS Input Levels: 0V to 3V Transition Times: 5 ns CAPACITANCE (tA = 25 °C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Capacitance on all pins (except DQ) CI 7pF Capacitance on DQ pins CDQ 10 pF AC ELECTRICAL CHARACTERISTICS (POWER-UP/DOWN TIMING) (Over the Operating Range) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES CE or WE at VIH before Power-Down tPD 0 µs VPF (Max) to VPF (Min) VCC Fall Time tF 300 µs VPF (Min) to VSO VCC Fall Time tFB 10 µs VSO to VPF (Min) VCC Rise Time tRB 1 µs VPF (Min) to VPF (Max) VCC Rise Time tR 0 µs Power-Up tREC 15 35 ms Expected Data Retention Time (Oscillator On) tDR 10 years 4 |
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