LSF0108: When input high Z will it be reflected at other side

Hi Adam,

I would highly recommend this video series to learn exactly how the LSF works: Understanding the LSF family of bidirectional, multi-voltage level translators

I'm a bit confused by what you mean -- what exactly is being placed into a high-impedance state here?

The LSF0108 cannot have a single input put into a hi-z state, so I'm guessing you mean one of the drivers controlling the A side of the device. If that's the case, then I need to know if there are pull-ups connected to the A or B side and what supplies those are connected to. I also need to know the condition of the bias circuit (VrefA, VrefB, and EN pin), and the condition of the driver connected to the B side of the channel in question.

A schematic would help to answer a lot of my questions.

I'll just give an example schematic here and see if that helps:

(image from the applications section of the datasheet)

If we assume that the MDC connection at A2 is in the hi-z state and that the MDC connection on the other side is also in the hi-z state, then the pull-up resistor will pull A2 up to 1.8V.  When that happens, the input to the LSF at A2 is "high" and the output will also be "high" and go to 3.3V.

You may find this helpful: [FAQ] What is a floating input or floating node?