- Would current flow across load when there is 0 (0V) on the IC's output without burning the chip?
Yes the current would flow across through the load when there is 0 (0V) on the IC's output without burning the chip. No harm would be done.But the as soon as you set the output to 5V the chip would be instantly destroyed.
Would it really?
It's a 3 mA load, I'd expect the ESD diodes would shunt that away from the output buffer.
So would the circuit on the link not work
Yes.While there is no official current rating for those diodes, in an application note it says to keep the current below 1mA. The point is that they are ESD diodes they are not designed as over voltage protection diodes. That is to say they are designed more for discharge pulses than a continuous conduction.
I just have a vision of someone ignoring what you said and doing it anyway, and if it's not instantly destroyed thinking that you don't know what you're talking about.
By the way, an ex coworker just released his 10th book on ESD. ESD diodes are not "normal" structures you would use in the design of circuits even though they were built with normal diffusions. I designed everything in my off chip drivers except the ESD device.
Link? I'm always up for new learning.