Analysis

High-speed crossbar switch supports signal routing

17th December 2019
Alex Lynn

Diodes Incorporated has announced, at USB Developer Days, the PI3DBS16222 crossbar switch for high-speed differential and serial signals. Optimised for the latest protocols, it provides a solution to routing high-speed signals up to 20Gbps around high-performance electronic equipment, from personal computers and mobile devices to network switch backplanes and high-end test tools.

With the increasing use of high-speed serial and differential protocols, such as PCIe 4.0, Thunderbolt 3, SuperSpeed USB 20Gbps, and 10 GBase-KR, there is a growing demand for more efficient solutions able to switch and route signals around PCBs and between connectors and integrated circuits. Because these signals now run at up to 20Gbps, any solution must operate without impacting signal integrity or introducing delays or errors.

The PI3DBS16222 is a four-channel, differential crossbar switch with pass-through mode, configured in a two by two topology. It features four differential pairs on the input side and four pairs on the output side. A single control signal switches each input pair between two output pairs while a separate enable input provides input/output isolation with high impedance.

“Adoption of the USB Type-C interface is growing exponentially and facilitating the industry’s move to SuperSpeed USB 20Gbps capable products,” said Jeff Ravencraft, President and COO of the USB Implementers Forum. “Solutions such as the PI3DBS16222 provide USB developers a valuable tool when designing high-speed signal paths for new SuperSpeed USB 20Gbps applications.”

“Diodes Incorporated is proud to enhance our industry leading, 20Gbps Signal Mux family with our latest four-channel, differential crossbar switch,” added Kay Annamalai, Senior Marketing Director, Diodes Incorporated. “Our crossbar switch operates with extremely high -3dB bandwidth of 13GHz, leading to usage in high-speed routing of signals that is growingly needed in mobile computing, networking, and server/storage applications.”

The PI3DBS16222 operates at up to 20Gbps with good signal integrity, enabling it to cover all of the mainstream protocols. The performance is enabled in part by Diodes Incorporated’s use of silicon on insulator (SOI) technology, which drastically reduces the effect of parasitic capacitances within the device, directly contributing to increased performance.

The device is offered in the TQFN package measuring 2.5x4.5mm and the X1QFN package measuring two by four millimetres. Its small size makes the PI3DBS16222 suitable for use in space-constrained mobile applications.

The PI3DBS16222XEAEX (X1QFN) is available at $1.00 each and the PI3DBS16222ZLEX (TQFN) is available at $1.05 each, both in 5,000 piece quantities.

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