The TMUXHS4412 is a high-speed passive switch device that can behave as a mux or demux. The TMUXHS4412 is a passive switch that provides no signal conditioning capability, therefore signal integrity is important. To implement PCIe lane switching topology, the designer must understand the following.

• Determine the loss profile between circuits that are to be muxed or demuxed.
• Provide clean impedance and electrical length matched board traces.
• Provide a control signal for the SEL and PD pins.
• The thermal pad must be connected to ground.
• See the application schematics on recommended decouple capacitors from V_CC pins to ground.