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Altera_Forum's avatar
Altera_Forum
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16 years ago

Cyclone ii, VCCIO 2.5V and 3.3V input

Hello everybody, is it possible to connect 3.3V to an input located in a bank configured to VCCIO 2.5V without e.g. an external resistor for voltage translation? Is the input 3.3V tollerant in...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

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I/O standard 2.5V in the said table and elsewhere means mainly VCCIO of 2.5 V. It's not generally required to enable PCI clamp diodes when overdriving the input, but should be done, if you expect an overshooting input signal.

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Thanks for your answer FvM. Then my setting is fine :)