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Altera_Forum's avatar
Altera_Forum
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16 years ago

open-drain/open collector type of output

Hi All, This might have been discussed before, but I didn't see a definite answer. I have one IO pins which I wanna assign it to be a open-drain type. I tried to add the following attribute ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

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But this schematic inside EPM3064A in same hardware don't working :-(.

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You're talking in riddles. I assume, that the schematic as such is working, but possibly the part isn't behaving as expected with the external circuitry.

Real 74LS245 hasn't open drain outputs, so it can't behave identically. Actually, I don't understand why you are using open drain at all? For the same reason, I can't recommend a pull-up value.