In examples, an input/output (I/O) circuit comprises an input, an output, and a first transistor having a first control terminal, a first current terminal and a second current terminal, the first current terminal coupled to the input. The circuit also includes a second transistor having a second control terminal, a third current terminal and a fourth current terminal, the third current terminal coupled to ground and the fourth current terminal coupled to the second current terminal. The circuit further includes a third transistor having a third control terminal, a fifth current terminal and a sixth current terminal, the third transistor coupled between the input and the output and the third control terminal coupled to the second current terminal.