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Altera_Forum's avatar
Altera_Forum
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15 years ago

Same logic high ,but different voltage

Hi,guys. So why different pins have different voltage, while they are all logic high. (In my experiment,one is 1.14V, the other is 3.3V) Appreciate for any reply
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Thanks ,FVM.

But PIN2 of the J15 is 5V, on the other hand pin1 is GND, which is read from reference manual. I also checked it by oscillograph.

But not all the VCC io is 5V,some of them is 3.3V