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SN65HVD78: Impedance of "R" pin and capacitance of "D" pin

Part Number: SN65HVD78
Other Parts Discussed in Thread: THVD2450


the SN65HVD78 and similar parts like (THVD2450) have the following structure on the Receive pin (datasheet page 16)

I would like to know the impedance of the output stage ? or how to calculate it from rise time and fall time. 

I would also like to know the capacitance of the Input pin "D" or how to calculate from the datasheet parameters.

The reason I need this information is that i want to place a series resistor on this "R" pin to match it to the pcb track impedance simlar to the following figure:

best regards