The Fairchild Switch FSAL200QSCX is a rail-to-rail quad 2:1 high-speed CMOS TTL-compatible analog multiplexer / de-multiplexer switch. The low on-resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. When OE is low, the select pin connects the A Port to the selected B Port output. When OE is high, the switch is open and a high-impedance state exists between the two ports.