Looking at the NXS device used in up translation mode, meaning that the device is driving from a lower voltage domain on the A-side to a higher voltage domain on the B-side. Before translating a high-level signal, the pass transistor conducts the low voltage on the A-side through to the B-side. As the input signal rises, the pass transistor will switch off when the voltage exceeds the gate voltage minus the threshold voltage. When the input voltage rises to approximately V_CC divided by two, the one-shot will activate to speed up the rising edge of the signal via the PMOS driver. When translating a low-level signal, both sides will start at a high level. The input signal will drive the A-side low. The pass transistor will begin to conduct when the gate-to-source voltage exceeds the threshold voltage. The output port will then follow the input port towards the low level.