CBTU02044 High-Speed Differential 1-to-2 Switch NXP Semiconductors CBTU02044 High-Speed Differential 1-to-2 Switch is optimized to interface with PCIe4.0 for server and client applications. This high-performance switch IC can also be used for other high-speed interfaces such as PCIe-Gen4, MIPI, DP1.4, and DDR. The CBTU02044 also functions as a 2-to-1 MUX by selecting 1 (Port A) as output out of one of the two differential ports, either Port B or C.