Article ID: 000075197 Content Type: Troubleshooting Last Reviewed: 09/11/2012

If I set the unused pins as "inputs tri-stated" or "inputs tri-stated with weak pull up" in Quartus II software, do I have to connect the pins on the PCB?

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BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description

If you set the unused pins as "inputs tri-stated" in the Quartus® II software, you should connect the pins on the PCB to VCCIO, GND, or a static signal for better noise immunity.

If you set the unused pins as "inputs tri-stated with weak pull up", you do not have to connect the pin on the board. The internal pull up to VCCIO will bias the pin and prevent it from floating.

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