Bus switch supporting high-speed digital signals of PCIe® Gen 5.0 and USB4®

The new products TDS4A212MX and TDS4B212MX use Toshiba's proprietary SOI process (TarfSOI™) to achieve the extremely high Bandwidth (27.5GHz (typ.)[1] @ -3dB). This allows the new products to be used as a Mux/De-Mux switch for high-speed differential signal interface[2] such as PCIe® 5.0, USB4® Ver.2 and USB4®.
TDS4B212MX and TDS4A212MX have different pin assignment. The pin assignment of TDS4B212MX is optimized for high-frequency characteristics. That of TDS4A212MX is having the board layout taken into our consideration.

Notes
[1]: In the case of TDS4B212MX. TDS4A212MX is 26.2GHz (typ.).
[2]: PCIe® Gen 5.0・PCIe® Gen 4.0・USB4® Ver.2.0・USB4®・Thunderbolt ™4・DP 2.0, etc

PCIe® Gen 5.0/CXL 2.0 application example: Mux/De-mux

The TDS4A212MX and TDS4B212MX are recommended for multiplexing and demultiplexing PCIe® Gen 5.0 signal lines on PC motherboards and servers.

Motherboard PCIe5 x 16 slot Mux/Demux application example

Motherboard PCIe5 x 16 slot Mux/Demux application example

Motherboard PCIe® slot specification:
    2 x PCIe® x 16 slots (supports slot 1 x 16 or slot 1 x 8/slot 2 x 8 modes) 

Excellent frequency response with a -3dB bandwidth of over 26GHz

Excellent frequency response with a -3dB bandwidth of over 26GHz

Toshiba's latest high-speed bus switch has a wide frequency characteristic (-3dB bandwidth) of 27.5GHz.
High-quality design is facilitated by low signal attenuation when used in high-speed interfaces (See figure below). 

Electrical Characteristics (Typ.) TDS4B212MX TDS4A212MX
-3dB Bandwidth 27.5GHz 26.2GHz
Differential
Insertion loss
[dB]		 5.0GHz -0.8 -0.9
8.0GHz -0.9 -1.0
10.0GHz -0.9 -1.1
12.8GHz -1.2 -1.4
16.0GHz -1.4 -1.9

TDS4B212MX PCIe® Gen 5.0, USB4® Ver.2 Eye pattern

＜32Gbps (NRZ), 40Gbps (PAM3) Eye pattern test result＞

※NRZ and PAM3 are methods for transmitting digital signals. (NRZ: Non Return Zero, PAM: Pulse Amplitude Modulation)

Toshiba Evaluation Board

Toshiba Evaluation Board

Test result (Eye pattern)

* For the evaluation results and detailed information, please refer to the following application note.
Application Note (PDF: 1.58MB)

32Gbps (PCIe® Gen 5.0 Nyquist frequency: 16GHz, NRZ)

32Gbps (PCIe® Gen5.0 Nyquist frequency: 16GHz, NRZ)
Type Height
［mV］		 Δ Height
［mV］		 Tj
［ps］		 ΔTj
［ps］
Through Path
(Without TDS4B212MX)		 826 - 3.65 -
TDS4B212MX mounting board 678 -148 3.83 0.18

40Gbps (USB4® Ver.2 Nyquist frequency: 12.8GHz, PAM3)

40Gbps (USB4® Ver.2 Nyquist frequency: 12.8GHz,PAM3)
Type Height
［mV］		 Δ Height
［mV］		 Tj
［ps］		 ΔTj
［ps］
Through Path
(Without TDS4B212MX)		 Hi 406 - 14.49 -
Lo 404 - 14.24 -
TDS4B212MX mounting board Hi 380 -26 17.37 2.88
Lo 376 -28 17.10 2.86

Below is a product overview.

32Gbps/Lane 2:1 Mux/De-Mux (Part Number: TDS4A212MX, TDS4B212MX)

High-speed bus switch for high-performance differential signals using SOI process

TDS4B212MX Feature (Typ.)

  • Operating Supply voltage: 1.6 to 3.6V
  • -3dB Bandwidth: 27.5GHz
  • Low insertion loss: -1.4dB @f = 16GHz
  • Low return loss: -16dB @f = 16GHz
  • Low OFF isolation Loss: -14dB @f = 16GHz
  • Crosstalk: -36dB @f = 16GHz
  • Low Bit to Bit skew: 4ps
  • Low ch to ch skew: 2ps            
  • Low Ron: 7.9Ω Max@ VIS = 0V
  • ESD HBM: 2,000V
  • Small package: XQFN16 1.6 x 2.4 x 0.4mm

Pin Assignment (TOP VIEW)

Pin Assignment（TOP VIEW）

Package outline (XQFN16)

Package outline（XQFN16）

Link to product page: TDS4A212MX, TDS4B212MX

Bus Switches

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* PCIe® is a registered trademark of PCI-SIG.
* USB4® is a registered trademark of USB Implementers Forum.
* Thunderbolt is a trademark of Intel Corporation or its subsidiaries.
* TarfSOI™ is a trademark of Toshiba Electronic Devices & Storage Corporation.
* Other company names, product names, and service names may be trademarks of their respective companies.

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