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Altera_Forum
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14 years ago

Cyclone III 3.3 volt tolerant?

I am using an Altera Cyclone III development board. Into pin J4 which is suppose to be 2.5 volts - is it 3.3volt tolerant?
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Altera_Forum
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14 years ago

You can have damaging overshoots at 3.0V too, it's better to ensure that the cyc3 pins are well protected against overshoots (clamping diodes, and/or a buffer close to FPGA as an example) rather than just reduce the I/O voltage by 0.3V.