How high can pull up/down resistances be?
The value of a pull-up or pull-down resistor is limited by the leakage current of whatever it is pulling.
For instance, say you have a 100K pull up resistor on a mosfet gate connection, and the mosfet has a gate leakage current specification of +-10uA. Your 100K resistor may only pull it up to around 4V due to this worst case leakage current.
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