I checked slau607. I am pretty sure that this can be done only by one TXB chip, but you can follow TI solution presented on fig.21. However, or schematic lvc125 (translator) gates are powered by 1.5V, and AFAIK lvc min working voltage is 1.65V. Or logic gates on schematic are incorrectly marked (it is not lvc family), or TI use parts outside of datasheet specifications.
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