What are Nch open drain output and CMOS output?

Nch open drain output and CMOS output show the type of output configuration of the output terminal.

Nch open drain output

CMOS output

Nch open drain output: output voltage

CMOS output: output voltage

The Nch open drain output is only input by the Nch FET between the output terminal and the ground terminal.
FET is only input to the ground side, so pull-up resistance and pull-up voltage needs to be provided externally. Providing pull-up voltage to match the output destination microcomputer, etc., makes it possible to change the level of the output voltage to match the output destination device.

In the CMOS output, a CMOS inverter is built into the output terminal.
Unlike the Nch open drain output, there is no need to provide a pull-up resistance or pull-up voltage. For this reason, a quiescent current that flows in the pull-up resistance does not exist in the CMOS output, so this is optimum for low consumption applications.