8.4 Device Functional Modes

The select (SELx) pins are active-high logic pins that control the connection between the source (Sx) and drain (Dx) pins of the device. The TMUX1511 has internal weak pull-down resistors (6 MΩ) to GND so that it powers-on with the switches disabled. When a given select pin of the TMUX1511 is pulled high, the corresponding switch conducts from the source to drain. When any of the select pins are pulled low, the corresponding switch is in an open state (HI-Z). Each channel of the TMUX1511 can be controlled independently through the associated select pin, or all four select pins can be tied together for simultaneous control of all channels with a single GPIO.