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SN65LVCP404 - Unused inputs/outputs

Other Parts Discussed in Thread: SN65LVCP404

I am using the SN65LVCP404 for it's pre-emphasis feature. I am only using one of the 4 inputs/outputs. I have set it up with the following inputs....

S10, S11, S20, S31 ----> Logic 0

S21, S30, S40, S41 ----> Logic 1

This should feed the inputs directly to the corresponding outputs (i.e. 1A/1B ----> 1Y/1Z, etc..)

1DE ----> Logic 0  (Active)

2DE, 3DE, 4DE ------> Logic 1 (disabled)

My question is... Can I leave inputs 2A/2B, 3A/3B, 4A/4B floating or do they need to be tied to a level even if they are not used?

Thank you,

Michael Nycz