The datasheet's Detailed Description, page 10, can cause confusion for customers with regard to the functioning of the level translator. The text copied below from p. 10 can be (incorrectly) interpreted to mean the logic signal is inverted from input to output:
"A low-voltage logic signal present on the VL side of the device appears as a high voltage logic signal on the VCC side of the device, and vice-versa."
The statement is not referring to logic levels high (logic 1) or low (logic 0) being inverted through the translator--signals are not inverted. Instead it is referring to the logic supply voltage on each side of the translator. It is assumed that the VL side is the lower voltage logic supply, and the VCC side is the higher voltage logic side. A logic high ("1") presented at the input will be passed through the translator to the other side and presented as a logic high ("1") at the output side.