If any of the source pin voltage goes above the supplies (V_DD or V_SS) by one threshold voltage (V_T), then the overvoltage protection feature of the TMUX7411F, TMUX7412F, and TMUX7413F is triggered to turn off the switch under fault, keeping the fault channel in a high-impedance state. I_S(FA) and I_D(FA) denotes the input and output leakage current under overvoltage fault conditions, respectively. When the overvoltage fault occurs, the supply (or supplies) can either be in normal operating condition (Figure 8-5) or abnormal operating condition (Figure 8-6). During abnormal operating condition, the supply (or supplies) can either be unpowered (V_DD= V_SS = 0 V) or floating (V_DD= V_SS = no connection), and remains within the leakage performance specifications.

Figure 8-5 Measurement Setup for Input and Output Leakage Current under Overvoltage Fault with Normal Supplies

Figure 8-6 Measurement Setup for Input and Output Leakage Current under Overvoltage Fault with Unpowered or Floating Supplies