Forum Discussion
BWalker
New Contributor
New ContributorWill a Cyclone IV be damaged if a a 3.3V LVTTL output is driven high, but connected to ground?
Will a Cyclone IV be damaged if a 3.3V LVTTL output is driven high, but connected to ground? The pin has the current strength set to 8 mA. I'm working on an old design where the original designer a...
Thank you for answering my question!
However, I'm still misunderstanding something.
I thought it would be safe, because this pin has the "CURRENT_STRENGTH_NEW 8MA" assignment set. I thought this meant there was an internal current limiting feature to limit the output current to 8 mA under any situation, including when shorted to ground.
8 mA is well below the Absolute Maximum Rating of 40 mA for the DC output current per pin.
Would you please confirm I misinterpreted how this works?
Thank you!
FvM
Super Contributor
Super ContributorHi,
according to output characteristics documented in Ibis files, shorted output current ttl33 8mA will probably exceed absolute maximum ratings for pin current. Damage possible.
according to output characteristics documented in Ibis files, shorted output current ttl33 8mA will probably exceed absolute maximum ratings for pin current. Damage possible.
