SN75LVDS82: Unused inputs pins

Hi Logan, 

Thank you for the quick reply. Please see feedback from the customer.

"Thanks for your reply!
In a new design, I would certainly place the three resistors, as suggested, in order to ensure a stable situation at the input, but in this case it's not an option.
Do you see any possible problems arising from A3P/A3M being unconnected?
Shorting the two pins is of course doable, but maybe not a good idea?"

Your help is much appreciated.

Kind regards, 

Marvin

The inputs require a differential voltage of at least ±100 mV. A smaller voltage is undefined and can lead to oscillations.

So the inputs should not be left floating, and certainly should not be shorted.

Hi Marvin, 

What will the be the state of the inputs of those parallel data pins on  LVDS83 side? Will they be pulled to GND/driven low? If so, then they can consider still connecting the LVDS input. It is not recommended to have them floating. If undefined, output data for those outputs (D27 D5 D10 D11 D16 D17 D23) will be undetermined.

It sounds like they are trying to retrofit a previous design using all four LVDS channels? 

Regards, 

Logan