The TMUXHS4212 is a high-speed passive switch device that can behave as a mux or demux. Because this is a passive switch, signal integrity is important because the device provides no signal conditioning capability. The device can support 2 to 3 inches of board trace and a connector on either end.

To design in the TMUXHS4212, the designer needs to 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 OEn pins.
• The thermal pad must be connected to ground.
• See the application schematics on recommended decouple capacitors from V_CC pins to ground.