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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
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16 years ago

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But I am not sure whether this information is only valid for banks with a VCCIO setting of 3.3V.

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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.