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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

Thanks fo clarifying this. I thought the use of substate diodes was common practise to protect the silicon. On the other hand, it does have some disadvantages.

I always wondered if Altera used substrate diodes. This was never mentioned explicitly in the documentation I've read.

But because you can switch on and off PCI clamping diodes, I doubted about this. Now I know. Thanks.

Regards, Ton