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Altera_Forum
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16 years ago

A question regarding MAX II I/O supply voltage

Hi everyone! Been searching the literature and googling around, but I've found no indication as to whether it is a problem to connect the VCCIO pins of the MAX II device to a non-standard volt...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Thanks for the swift reply.

My question was directed towards a voltage which is not specified in the data sheet, so obviously the Vih and Vil would not hold for an upper or lower voltage. For example if I'm connecting the Vccio to 2.75v, I don't expect the Vih and Vil levels to be either that of 3.3v or 2.5v.

I am expecting to see roughly a Vih and Vil of 0.65*Vccio and 0.35*Vccio respectively, and a Voh and Vol of 0.75*Vccio and 0.25*Vccio respectively.