Are there Mux (multiplexer) / De-Mux (demultiplexer) type bus switches supporting PCIe® Gen 5.0, PCIe® Gen 4.0, Thunderbolt™ 4, USB4®?

For a bus switch to support these communication interfaces, it must have high-frequency characteristics sufficient for their communication speeds. Toshiba product TDS4A212MX, TDS4B212MX support these interfaces.

Both TDS4A212MX and TDS4B212MX support PCIe®*1 Gen 5.0, PCIe®*1 Gen 4.0, Thunderbolt™*2 4 and USB4®*3 and have the same functional and identical packaging with differing pinouts.

Fig. 1 TDS4A212MX, TDS4B212MX Pinout (Top View)
Fig. 1 TDS4A212MX, TDS4B212MX Pinout (Top View)
Table-1 Operating Supply Voltage and High Frequency Response of-1 TDS4A212MX, TDS4B212MX
Item TDS4A212MX TDS4B212MX
Operaring Supply voltage 1.6 to 3.6V
-3dB Bandwidth 26.2GHz 27.5GHz
Differential Insertion
loss@16GHz		 -1.9dB -1.4dB
Differential return
loss@16GHz		 -18dB -16dB
Differential OFF
isolation @16GHz		 -11dB -14dB
Differential Crosstalk
@16GHz		 -30dB -36dB
Fig. 2 Typical Wiring of TDS4A212MX, TDS4B212MX
Fig. 2 Typical Wiring of TDS4A212MX, TDS4B212MX

The features of each pin arrangement are described below.

TDS4A212MX maintains the input-differential-pair positional relationship in its pinout. Therefore, the wiring does not cross in the layout shown in Fig. 2.
The TDS4B212MX has a shorter internal wiring pin layout to reduce signal attenuation. Therefore, it has higher high-frequency characteristics than the TDS4A212MX.

Please refer to the following technical articles and application notes for the Eye Pattern evaluation using the S-parameter and PCIe®5-signal.
Technical article: Bus switch supporting high-speed digital signals of PCIe® Gen 5.0 and USB4®

Application Note: For high-speed differential interface 32Gbps MUX/DEMUX bus switch TDS4A212MX, TDS4B212MX (PDF: 1.58MB)

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*1: PCIe® is a trademark of PCI-SIG.
*2: Thunderbolt™ is a trademark of Intel Corporation or its subsidiaries.
*3: USB4® is a trademark of USB Implementers Forum.

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