Could you kindly help to check the input resistance of TLV9002-Q1? It doesn't mention in datasheet.
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The inputs do not really behave like resistors. In theory, CMOS inputs have infinite resistance; in practice, you have input bias currents of 5 pA, which are mostly leakage currents from the ESD protection diodes.
You can compute a resistance by dividing your input voltage (e.g., 5.5 V) by IB.