TS3USB30: decoupling capacitor values?

Adam Feuer

Part Number: TS3USB30

Hi, I'm using TS3USB30 in a new design. The datasheet doesn't list the recommended value for the decoupling capacitor– what should the value of the decoupling capacitor be? Will 0.1 uF work?

-adam

Adam Feuer

Starcat LLC

over 2 years ago

0 Brian Zhou over 2 years ago

TI__Guru** 104630 points

you mean the decoupling cap for power supply? what is the data rate of your signal? normally use 1uf/0.1us to cover different frequency range.

0 Adam Feuer over 2 years ago in reply to Brian Zhou

Prodigy 10 points

Brian, thanks for responding. Yes, I mean decoupling capacitor for the power supply. I'm using the TS3USB30 to switch a USB 2.0 signal, so the data rate through the chip will be 480Mbps. Can you say more about the 1uf/0.1us heuristic you suggested? I am not sure how to apply that in this case.

The period of the signal will be 0.002083us, so would that mean I should use a 0.02uf capacitor? Looks like I can't get 0.02uf caps, but can get 0.022uf capacitors in 0402 or 0603 sizes.

+1 Brian Zhou over 2 years ago in reply to Adam Feuer

TI__Guru** 104630 points

1uf close to power supply, 0.1uf/0.022uf close to VCC pin

0 Adam Feuer over 2 years ago in reply to Brian Zhou

Prodigy 10 points

Perfect, thanks!

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TS3USB30: decoupling capacitor values?