Following up on what someone else mentioned, a pin can be used as an open
drain output by driving the TRIS register instead of the PORT or LAT
register. You set the PORT or LAT bit low. When TRIS is low, the pin is
pulled low. When TRIS is high, the pin floats. If the pin has a 5V
tolerant input, it can be pulled up to 5V, making this a 5V output.

But, I think I recall the original problem being a UART interface. Since
you can't make the UART drive the TRIS bits, that would not work here. In
that case, I still think the 74HCTxxx is a good solution.

Harold





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