The Fairchild Switch FST32253 is a dual 4:1 high-speed CMOS TTL-compatible multiplexer/demultiplexer bus 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. The FST32253 has an equivalent 25Ω series resistor to reduce signal-reflection noise, eliminating the need for external terminating resistors.