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Altera_Forum's avatar
Altera_Forum
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15 years ago

Cyclone III with 5v inputs

I'm trying to connect approximately (16) 5v TTL inputs into a Cyclone III eval board, the terasic de0 [1]. These are all input towards the FPGA only. The eval board has (2) 40-pin IDC headers for t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Your design sounds reasonable.

Did you notice that NKC sell pre-made boards for $1.95

http://www.nkcelectronics.com/5v-to-33v-logic-level-shifter-bo.html

However, I believe the DE0 has input protection clamps, so you would not need this circuit. Please review the schematic of the DE0. It should be on the CD available from Terasic.

Cheers,

Dave