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SN74LVC2T45: SN74LVC2T45 Outputimpedance - Serial Termination

Part Number: SN74LVC2T45
Other Parts Discussed in Thread: SN74LVC2G34

Dear Madam and Sirs,

follow question:

We will use the SN74LVC2T45 device as a clock driver mit 3,3 V Vcc and 20 MHz clock rate.

But in your datasheets I can't find no value or specification for the output impedance. 

What is the output impedance from the SN74LVC2T45?

We use this value to calculate the serial resistor for the output termination.

The coated microstrip impedance from the PCB is approx. 68 R.

Thank you and best regards

Martin