8 GHz bandwidth — what it buys the DisplayPort 1.4 signal path
The HD3SS214ZXHR is a 2:1 multiplexer/demultiplexer from Texas Instruments designed for DisplayPort 1.4 signal routing. Its 8 GHz -3dB bandwidth supports the 8.1 Gbps per lane data rate required by DisplayPort 1.4 HBR3, making it suitable for switching between two DisplayPort sources or routing to one of two sinks in laptops, docks, and monitors. The SPDT switch configuration handles the four main-link lanes plus AUX and HPD signals with differential compatibility.
Package and supply — layout constraints for the 50-NFBGA
The part comes in a 50-NFBGA package measuring 5x5 mm (supplier device package 50-NFBGA), which dictates a fine-pitch BGA footprint with via-in-pad requirements for the differential pairs.
On-state resistance and channel count — signal integrity considerations
Maximum on-state resistance is 12 Ohms, which is typical for a passive mux at these data rates; the insertion loss and return loss budgets in the DP 1.4 spec assume this level of series resistance. Two channels handle the four-lane main link (two channels per differential pair), and the 2:1 mux/demux configuration supports source or sink selection without external redrivers in short-reach applications.
This eliminates last-time-buy risk for designs entering production.