On the inputs I have nice sharp square waves (transition times < 10nS) and on the output I have very slow transitions (> 1us) with oscillation on the way there. The outputs are loaded with either a scope probe or a RS232 chip and a scope probe. I measured the scope probe and it is > 10M and it's the same probe that I measured the chip input with.
This chip is an autodetect bidirectional. I am thinking that the design itself is tempermental (Maybe I should be loading the output more?). I also have another chip from Maxim, MAX3002, with the same design on a separate board which is doing basically the same thing. These chips should pretty much be transparent and it seems incredible that neither will work right even when I troubleshoot down to the chip level.
Does anyone know of any pecularities with this bidirectional design or have any suggestions which might help? I have checked all power inputs and the enable (tied high). I am not an inexperienced designer, but am getting beaten up by a simple buffer chips.
Thanks, Don Waltman
