What is the input voltage range and the input voltage versus the output voltage and the R-on?
The PI3L110 switch has a wide input signal voltage range. At 3.3V Vcc, from -0.5V to +5V, with low and flat R-on and the output voltage will follow the input voltage in this range. At 3.3V Vcc, when the input signal is -0.5V to 3.3V, the R-on is 4ohm/5ohm typical, when the input signal higher than 3.3V, the R-on is getting slightly higher but will be below 9ohm when the input signal is reaching 5V.