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Altera_Forum's avatar
Altera_Forum
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16 years ago

Vi and VCCIO

hello, I am just starting designs with Altera devices and I hope my question will be easy to answer. 1. VCCIO is just a supply power for input and output buffers of the device. 2. If ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

I would say leave it at 2.5V if the microcontroller accepts 2.0V as Vih. That's what I do in my designs.

Since it's your own adapter board, if you decide you need 3.3V, I would add level translation.

Jake