I'm protecting a USB2.0 IC against ESD and overvoltage at the USB connector using a Diodes Incorporated DM1231-02SO TVS (dual) array. The datasheet labels the pins IN and OUT, but it's not 100% clear which of those should be on the USB connector side and which on the IC side. The datasheet refers to zapping at the OUT pins, which significantly implies that the OUT pins should be on the connector side.
Is my assumption correct that the OUT pins should be connected to the USB connector pins (and that this is an appropriate device for USB2.0 protection)?
What is the electrical explanation for placing the device that way around?