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Altera_Forum
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14 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...
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Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Last, but not least,

if I use pull-downs on the buffer inputs like you mention here (http://www.alteraforum.com/forum/showpost.php?p=123853&postcount=8)

What size pull-down should I use?

This will make sure that the buffer always has some valid value --- if not asserted from the device it's connected to, then at least ground from the pulldown.

Thanks

Keith