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Observer sasisaketh
Observer
1,951 Views
Registered: ‎09-23-2016

What is the recommendation for unused Zynq IO pins ?

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Hi,

 

In my application the Zynq has to operate in an environment where charge buildup on the unused pins is a possibility. What is the recommendation from Xilinx for unused Zynq IO pins ?

 

Thanks,

Saketh

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Scholar austin
Scholar
3,638 Views
Registered: ‎02-27-2008

Re: What is the recommendation for unused Zynq IO pins ?

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S,

 

Do nothing.

 

Unused pins are weakly pulled (high/low as appropriate) by default.  You have to intentionally turn off these pullups if you do NOT want them.

 

All IO are protected against ESD, reverse currents up to 100 mA by the protection diodes on the IO structures.

 

As long as you do not exceed the absolute maximum specifications in Table 1 of the data sheet, and the ESD specification, you will be OK.  If your stresses are greater, then you must provide protection.

 

 

Austin Lesea
Principal Engineer
Xilinx San Jose

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Scholar austin
Scholar
3,639 Views
Registered: ‎02-27-2008

Re: What is the recommendation for unused Zynq IO pins ?

Jump to solution

S,

 

Do nothing.

 

Unused pins are weakly pulled (high/low as appropriate) by default.  You have to intentionally turn off these pullups if you do NOT want them.

 

All IO are protected against ESD, reverse currents up to 100 mA by the protection diodes on the IO structures.

 

As long as you do not exceed the absolute maximum specifications in Table 1 of the data sheet, and the ESD specification, you will be OK.  If your stresses are greater, then you must provide protection.

 

 

Austin Lesea
Principal Engineer
Xilinx San Jose

View solution in original post

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