I see this phrase a lot, and even though I've read the definition, I'm not clear on a couple things.
To review, here's the Wikipedia definition:
An open collector is a common type of output found on many integrated circuits (IC), which behaves like a switch that is either connected to ground or disconnected.
In this case, does "disconnected" actually mean the same as "floating"? If it's floating, what guarantees deterministic behavior for the chip? The next part may actually answer that:
Because the pull-up resistor is external and does not need to be connected to the chip supply voltage...
There's no resistor pictured or mentioned before this. Do they mean something like "When you use an IC like this, you're going to definitely connect an external pull-up resistor, and that can be pulled high to a voltage that is different from the IC supply, subject to chip tolerances."
If that's the case, should I read any "open drain/collector" pin as quietly saying "pull me up"?
I really wish that somebody with a little foresight had decided on these terms. "Open" meaning "external" is just the latest for me in a huge set of words that weren't chosen for clarity. Don't get me started on "base, emitter, collector".