If the input high voltage (VIH) level is greater than or equal to VCC + 1V, and less than or equal to 5.5V, the output high voltage (VOH) level will be equal to approximately the VCC voltage level.
Figure 5. Typical DC Voltage Translation Characteristics
Figure 6. Logic Diagram (Positive Logic)
Figure 7. Simplified Schematic, Each FET Switch (SW)