Unused Inputs on LVDS Line Receiver

GAVIN HOURIHAN

Other Parts Discussed in Thread: DS90C032

I’m using a DS90C032 LVDS quad line receiver, but I am only using two of the inputs. The datasheet doesn’t mention anything about a fail-safe circuit. So, should I tie off the unused inputs or leave them unconnected? Thanks.

over 13 years ago

0 Avi Chami1 over 13 years ago

Mastermind 7395 points

From the datasheet, page 6

Open Input Pins. TheDS90C032 is a quad receiver device, and if an application requires only 1, 2 or 3 receivers, the unused channel(s) inputs should be left OPEN. Do not tie unused receiver inputs to ground or any other voltages. The input is biased by internal high value pull up and pull down resistors to set the output to a HIGH state. This internal circuitry will guarantee a HIGH, stable output state for open inputs.

0 GAVIN HOURIHAN over 13 years ago in reply to Avi Chami1

Prodigy 20 points

Thank you for the reply Albert. I had an older version of the datasheet that did not mention this in the app notes.

0 Avi Chami1 over 13 years ago in reply to GAVIN HOURIHAN

Mastermind 7395 points

Glad to help and that this solved your issue :)

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Unused Inputs on LVDS Line Receiver