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 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
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
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)
| 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)
| 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)
Package outline (XQFN16)
Link to product page: TDS4A212MX, TDS4B212MX
Bus Switches
* 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.