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LMH1218: Does the LMH1218 power down unused inputs automatically?

Part Number: LMH1218

I have an application where I am using the LMH1218 Cable driver.  I have two inputs connected to the device's 2:1 input Mux, but only 1 will be used at a time.  The other will be effectively floating.   Does the chip power down the unused inputs if it does not detect a signal on it?  Or do I need to add external resistors to pull the inputs down.  I would prefer not to add external parts due to the high-speed nature of the signals.

Thanks for the help.

Jesse C.