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DS1238 Datasheet(PDF) 13 Page - Dallas Semiconductor |
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DS1238 Datasheet(HTML) 13 Page - Dallas Semiconductor |
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13 / 14 page  DS1238 13 of 14 AC ELECTRICAL CHARACTERISTICS (0 °C to 70°C; V CC = 5V ± 10%) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES VCC Fail Detect to RST, RST tRPD 40 100 175 µs VTP to NMI tIPD 40 100 175 µs RESET Active OSCSEL=High tRST 40 85 150 ms ST Pulse Width tST 20 ns 13 PBRST @ VIL tPB 30 ms VCC Slew Rate 4.75 to 4.25 tF 300 µs Chip Enable Prop Delay tPF 20 ns VCC Fail to Chip Enable High tCF 712 44 µs 11 VCC Valid to RST (RC=1) tFPU 100 ns VCC Valid to RST tRPU 40 100 150 ms 5 VCC Slew to 4.25 to VBAT tFB1 10 µs Chip Enable Output Recovery Time tREC 0.1 µs 7 VCC Slew 4.25 to 4.75 tR 0 µs Chip Enable Pulse Width tCE 5 µs 8 Watchdog Time Delay Internal Clock Long period tTD 1.7 2.7 s Short Period 110 170 ms Watchdog Time Delay, External Clock, after Reset tTD 20480 clocks Normal 5120 clocks VBAT Detect to PF tPPF 2 µs OSC IN Frequency fOSC 0 250 kHz CAPACITANCE (tA=25 °C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Input Capacitance CIN 5pF Output Capacitance COUT 7pF |
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