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CLa_R's avatar
CLa_R
Icon for Occasional Contributor rankOccasional Contributor
6 years ago
Solved

Protection diode for FPGA IO pins

Hi to all. For my project I am using a Cyclone IV-E FPGA. The lowest input voltage on its IO pins is -0.5V (as showed on Altera datasheet). I have many input that can be lower that -0.5v (around -...
AnandRaj_S_Intel's avatar
AnandRaj_S_Intel
Icon for Regular Contributor rankRegular Contributor
6 years ago

Hi,

Yes, We can use external diode so that we can meet the devices absolute maximum DC input voltage and maximum allowed overshoot/ undershoot voltage requirements.

Regards

Anand

CLa_R's avatar
CLa_R
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

Thank you.

Even if it's not properly referring to FPGAs, could you tell me a suitable diode?

In the meantime, I have come up with another solution, which uses a transistor and which should be both faster and safer than the diode. I enclose the scheme. What do you think?