Ok. I have a device with an active-high totem-pole interrupt output. It needs to interface to an active-low interrupt line that expects open-drain interrupt outputs. My first inclination is to just use a small-signal MOSFET to add an open-drain interrupt output to said device. BUT, circuit around the device has spare 74HC04 inverters, so I guess I could use one of those and a diode.
@thorpej I'd go with the transistor. They're cheap enough, and the forward voltage of the diode might make the other solution violate some logic level requirement.
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