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DP83822HF: XI Characteristic Impedance

Part Number: DP83822HF

Hello, I was curious about the typical characteristic impedance of the XI input (pin 23) for the DP83822HF. I was trying to get an IBIS simulation to match my DSO measurement (zero-length at XI pin) and was seeing more undershoot than expected. I can change the series impedance matching resistor to a higher value, but knowing the actual typical input impedance would provide a good sanity check. I'm assuming the absolute maximum rating of -0.3V also applies to the clock input. The application uses the XI input only, XO is not connected. Thank you.