In this application, one 2-input open-drain XNOR gate is used to create a selectable buffer or inverter as shown in GUID-34EFC454-CA47-4DC2-BB6A-F3E254698CD2.html#APP1_SCHEM. This application allows for using a quad XNOR gate to produce any compbination of one to four buffers and inverters. Commonly each channel is permanently connected as either an inverter or buffer, however some systems do require the ability to switch between the two. If some channels are unused, the inputs can be grounded and the outputs left open.