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Beginner
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MAX V GPIO State at Power-Off

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If a MAX V has all of its voltage switched off, will the GPIO pins be in tristate? (Not during power-up or power-down, but when it's completely off.)

 

I ask because I am using the MAX V to control another IC, and I want to be able to control the IC with the MAX V or with an external header, for testing. The header would be in parallel with the MAX V GPIO lines. So, if I power off the MAX V, will I be able to communicate with the IC directly, without interference?

 

Thanks!

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Employee
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If no power given to the device, the Impedance will be undefined, why I am saying so each IO pin can be considered active component and can be act as energy storage device. In my point of view , it is not safe to give to power off only Max 5 in a board.

 

 

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4 Replies
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Employee
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Hi ,

If I understood correctly , if you loose the power of Max V , there will be no power on the IO pins

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Beginner
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No, sorry if I wasn't clear.

 

What is the input impedance of the GPIO pins when there is no power to the MAX V?

 

Thanks

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Highlighted
Employee
18 Views

If no power given to the device, the Impedance will be undefined, why I am saying so each IO pin can be considered active component and can be act as energy storage device. In my point of view , it is not safe to give to power off only Max 5 in a board.

 

 

View solution in original post

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Beginner
17 Views

OK, that makes sense. That's what I was wondering. Thank you!

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