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Altera_Forum's avatar
Altera_Forum
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8 years ago

Combining pins to source / sink more current

Hi, I have a Cyclone V that needs to be able to briefly source and sink current ~60mA for 1 to 8us before returning to the microamps range. I see that the IO pin max ratings are -25mA to 40mA....
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

It is difficult to guarantee that the current will be split evenly between the two pins. You could end up with more current on one pin than on the other. Check also if there is a limit on the full I/O bank current.

I think it would be more reliable to use an external buffer or a little transistor to do the job.