TS3USB221A: Input capacitance Cin/Cio(on)/Cio(off)

Cherry Zhou

Part Number: TS3USB221A

Hi team,

During the actual application, it was found that the transfer rate could not be increased. The customer suspects that the actual capacitance value is higher than the value written on the datasheet. Is the typical value of this parameter item tested? What should they do if they want to get the actual capacitance value?

Could you help check this case? Thanks.

Best Regards,

Cherry

over 1 year ago

0 Stanton Weaver over 1 year ago

TI__Intellectual 2850 points

Hi Cherry,

Thanks for your question. What is your data rate?

Con and Coff are calculated with the following.

Best,

Stanton

0 Cherry Zhou over 1 year ago in reply to Stanton Weaver

TI__Mastermind 22235 points

Hi Stanton,

Thank you for the support.

The data rate is 480Mbps.

Stanton Weaver said:
Con and Coff are calculated with the following.

Indeed what customers want to know is how to actually measure. This value is found to be related to the input signal level, frequency, etc. when using an LCR meter to measure the capacitance, but the datasheet does not give a specific test method.

Thanks and regards,

Cherry

0 Stanton Weaver over 1 year ago in reply to Cherry Zhou

TI__Intellectual 2850 points

Hi Cherry,

The capacitance values in the datasheet have been verified by design. However, we are not able to test the capacitance value that accurately.

Best,

Stanton

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TS3USB221A: Input capacitance Cin/Cio(on)/Cio(off)