I want to be able to turn on a single LED with either one of these two micro-controllers. Would there be anything wrong with this simple approach? The LED would experience double the current if both IC pins are grounded, but it wouldn't be enough to damage it; also the LED only blinks for a couple hundred milliseconds in any case, and never stays on constantly. Max sink current is also a non issue.
Please let me know if I am making a mistake or not.
edit for clarification: U2 pin is an open drain power good indicator that goes low automatically when usb power is supplied. U1 will turn on LED based on a couple of software events