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Choosing an Appropriate Pull-up/Pull-down Resistor for ...

VPG is shorted to ground. In reality, Q1 has a resistance, RDSon, which will drop some voltage and cause the PG voltage to be above ground potential. When Q1 is on, the PG voltage must be sufficiently low to register as a logic low to subsequent circuitry. To calculate the current in the pull-upresistor, the current labeled IOL is needed.

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  Resistance, Ground

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