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DS1511 Datasheet(PDF) 6 Page - Dallas Semiconductor |
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DS1511 Datasheet(HTML) 6 Page - Dallas Semiconductor |
6 / 20 page DS1501/DS1511 Y2KC Watchdog Real-Time Clocks 6 of 20 Figure 4. Burst Mode Timing Waveform A0 –A 4 D Q 0–D Q 7 O E , WE , OR CE 13h PW HIGH PW LOW POWER-UP/DOWN CHARACTERISTICS PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CE or WE at VIH Before Power-Fail tPF 0 ms VCC Fall Time: VPF(MAX) to VPF(MIN) tF 300 ms VCC Fall Time: VPF(MIN) to VSO tFB 10 ms VCC Rise Time: VPF(MIN) to VPF(MAX) tR 0 ms VPF to RST High tREC 35 200 ms (TA = +25°C) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Expected Data-Retention Time (Oscillator On) tDR (Note 9) 10 Years CAPACITANCE (TA = +25°C) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Capacitance on All Input Pins CIN 10 pF Capacitance on IRQ, PWR, RST, and DQ Pins CIO 10 pF AC TEST CONDITIONS OUTPUT LOAD INPUT PULSE LEVELS TIMING MEASUREMENT REFERENCE LEVELS INPUT PULSE RISE AND FALL TIMES (Y) 50pF + 1TTL Gate Input: 1.5V (W) 25pF + 1 TTL Gate 0V to 3.0V for 5V operation Output: 1.5V 5ns |
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