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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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After several tries, you finally succeded in showing an (almost) readable schematic.

But what's not working?

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In the simulator all ok.

Also I tryed add LCELL to adjust time-through of selection (see picture).

Real 74LS245 is working. But this schematic inside EPM3064A in same hardware don't working :-(.

What values of external pullups resistors is recomended?