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LM3712 Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LM3712 Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 13 page LM3712/LM3713 Series Electrical Characteristics (Continued) Limits in the standard typeface are for T J = 25˚C and limits in boldface type apply over full operating range. Unless otherwise specified: V CC = +2.2V to 5.5V. Symbol Parameter Conditions Min Typ Max Units WDI WDI Watchdog Input Current −1 +1 µA WDI T Watchdog Input Threshold 0.2 •V CC 1.225 0.8 •V CC V t WD Watchdog Timeout Period Watchdog Timeout Period = E, F, G, H Watchdog Timeout Period = J, K, L, M Watchdog Timeout Period = N, P, Q, R Watchdog Timeout Period = S, T, U, V 4.3 71 1120 17900 6.2 102 1600 25600 9.3 153 2400 38400 ms PFI/MR V PFT PFI Input Threshold 1.200 1.225 1.250 V V MRT MR Input Threshold MR, Low 0.8 V MR, High 2.0 V PFTH/ V MRTH PFI/MR Threshold Hysteresis PFI/MR falling: V CC =VRST MAX to 5.5V 0.0032 •V RST mV I PFI Input Current (PFI only) −75 75 nA R MR MR Pull-up Resistance 35 56 75 k Ω t MD MR to Reset Delay 12 µS t MR MR Pulse Width 25 µS PFO, WDO V OL PFO, WDO Output Voltage V CC > 2.25V, ISINK = 900µA 0.3 V V CC > 2.7V, ISINK = 1.2mA 0.3 V CC > 4.5V, ISINK = 3.2mA 0.4 V OH V CC > 2.25V, ISOURCE = 300µA 0.8 V CC V CC > 2.7V, ISOURCE = 500µA 0.8 V CC V CC > 4.5V, ISOURCE = 800µA V CC − 1.5V LLO OUTPUT V LLOT LLO Output Threshold (V LLO −VRST,VCC falling) 1.01 •V RST 1.02 •V RST 1.03 •V RST V V LLOTH Low-Line Comparator Hysteresis 0.0032 •V RST mV t CD Low-Line Comparator Delay V CC falling at 1mV/µs 20 µs www.national.com 6 |
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