HD3SS3202: used to USB2.0

tony chen1

Part Number: HD3SS3202
Other Parts Discussed in Thread: HD3SS6126, TS3USB221E, TS3USB221A, TS5USBC41, TS3USB3031

I used HD3SS3202IRSV to USB 2.0 interface as a switch, we can see the eye diagram is pretty good after pass HD3SS3202, but the USB 2.0 devices could not be scanned and detected.

Then I added pull-low resistor about 4.7K on the D- signal, the USB 2.0 high speed device can be identified.

So my questions are :

Could HD3SS3202IRSV only be used for USB3.0 application, but not USB 2.0 application? what is the reason behind?
Whether it has other risks if used to USB 2.0 high speed application with add pull down resistor on D-? I don't want to change PCB.
Could you recommend a USB switch for 2.0 application, but the capacitance will be around 1pF ?
If I add a USB switch, what's the parameter of the switch can impact signal quality? Ron, Con, bandwidth?
Could you recommend a USB switch for 2.0 application?

over 3 years ago

0 Brian Zhou over 3 years ago

TI__Guru** 118910 points

HD3SS3202 was designed for USB3 only, it can not support 3.3v signal . USB2 shirp J/K is 3.3v signal which is required for USB2 enumeration, That's why it passed USB2 HS eye diagram but failed functional test.

HD3SS6126 support both USB2 and USB3 switch.

for only USB2, we have TS3USB221A,TS3USB221E, TS5USBC41 if need OVP

0 tony chen1 over 3 years ago in reply to Brian Zhou

Prodigy 20 points

Hello Brian:

How about TS3USB3031? its bandwidth is 6.5GHz and Con is 1pf, so I think TS3USB3031 is better then the device you recommend, right?

0 Brian Zhou over 3 years ago in reply to tony chen1

TI__Guru** 118910 points

TS3USB3031 is better but it's 3:1 mux and more expensive, It's ddesigned for USB2 , not for USB3

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HD3SS3202: used to USB2.0