RHFLVDS31A Unused I/O pins

2 replies
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Hello,

Im using the RHFLVDS31A and I have some unused I/O pins. Should I terminate them or should I leave them floating? I saw that there is an internal pull up for Cold Sparing so I didn’t want to impact that.

Rad-hard

Peter BENSCHBest answer

ST Technical Moderator

Welcome @Lobert124, to the community!

I am not a Rad-Hard specialist; however, it is always advisable to terminate unused digital inputs if they are not already terminated with internal pulls, as in the case of G and /G. Whether the outputs need to be terminated will probably emerge from your application’s requirements specification.

Cold sparing has nothing to do with pull, but rather, as the datasheet states, are "buffers to ensure they are in high impedance when VCC is tied to GND".

Hope that helps?

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

Peter BENSCHBest answer

ST Technical Moderator

Welcome @Lobert124, to the community!

I am not a Rad-Hard specialist; however, it is always advisable to terminate unused digital inputs if they are not already terminated with internal pulls, as in the case of G and /G. Whether the outputs need to be terminated will probably emerge from your application’s requirements specification.

Cold sparing has nothing to do with pull, but rather, as the datasheet states, are "buffers to ensure they are in high impedance when VCC is tied to GND".

Hope that helps?

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

L

Lobert124Author

Associate

OK sounds good Peter, I just wanted to double check in case there were some internal ESD or pull up that wasn’t mentioned.

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