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Altera_Forum
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16 years ago

VCCIO Voltage Change

Hi, I use EP3C10F256C8 chip , VCCIO set 1.8V , if other IO pin input set Hi(3.3V), result VCCIO change 2.2V? VCCIO set 1.5V , if other IO pin input set Hi(3.3V), result VCCIO change 2.2V?
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Altera_Forum
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16 years ago

You are right to mention the programmable PCI clamp diodes, but these are the only positive clamping diodes in Altera FPGA. The lack of hardwired clamp diodes is implicitely clear from the "Multi-IO" paragraphs in various hardware manuals. Also maximum ratings would look different otherwise.

Frank