I am using 74AHC1G09, it has an open drain output. It says the maximum Vo is 7V, but also says "The input and output voltage ratings may be exceeded if the input and output current ratings are observed." My question is, what's the output current ratings means? Is it refer to "output current" or "output clamping current"? I think it is the output clamping current, because if Vo is pulled to a voltage higher than the IC's supply voltage, the output clamp diode will conduct, the datasheet want the user to protect this diode from overcurrent.
However, I see similar post "link", NXP's employee says it is the "output current" which should be observed. That doesn't make sense, because if that is true, the datasheet can only list the maximum ratings of Io, but it listed both the Io and Vo.
So can I pulled up to for example 12V through 10k resistor on the output of the gate, while only powers it from 3.3V? When doing this, will the 1mA current sourcing from 12V to 3.3V cause problem for the 3.3V supply, a linear regulator?