5.4 GHz bandwidth — what it buys the signal path
The HD3SS213ZXHR is a 1-to-2 multiplexer/demultiplexer from Texas Instruments built for DisplayPort 1.2a signal switching. Its 5.4 GHz -3dB bandwidth directly supports the 5.4 Gbps data rate per lane that DisplayPort 1.2a specifies, meaning the switch passes the high-speed differential pair without degrading the eye diagram. With a single SPDT switch circuit and 12 Ohm max on-state resistance, this part is sized for routing one DisplayPort source to either of two sinks — typical in laptop docks, monitors with integrated KVM, or video-wall controllers where the PCB needs to toggle the main video lane.