The on-resistance of the TMUX8108 and TMUX8109 is the ohmic resistance across the source (Sx) and drain (Dx) pins of the device. The on-resistance varies with input voltage and supply voltage. The symbol RON is used to denote on-resistance. The measurement setup used to measure RON is shown in Figure 7-1. ΔRON represents the difference between the RON of any two channels, while RON_FLAT denotes the flatness that is defined as the difference between the maximum and minimum value of on-resistance measured over the specified analog signal range.