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LSF0108 VrefA<VrefB?

Other Parts Discussed in Thread: LSF0108

Hi, when testing the lsf0108 to shift from 3V to 5V, I found the datasheet to specify that VrefA must be less than VrefB.  Problem is, when I hook the IC up that way, all my side A data lines are pulled up to 3.8V or thereabouts and all my 5V lines are pulled down to 4.2volts or thereabouts.


When I allow VrefA=5V and VrefB=3V, I get the values that I'm looking for on each side.  (Schematic represents this config.)  What am I missing here?

--thanks ahead of time!