TS5USBA224 Absolute Maximum Ratings for D+/R and D-/L

Kato,
I have comprehended your 3 questions and will work on gathering all 3 answers for you. I expect to have them all in a day or two.
Thank you, Adam

Hi Adam-san,

Thank you for you quick response.
I am considering the use cases as below.

I am looking forward to hearing from you.

Best regards,
Kato

Kato,

Q1. Absolute Maximum Ratings for D+/R and D-/L

Would you tell us the absolute maximum ratings for D+/R and D-/L as below ? Which is correct although "-0.5V to 6.5V" and "Vaudio - 6.5V to Vaudio + 0.5V" are mentioned in the is data sheet ?

I understand there may be some confusion with the functional diagram.  There isn't a mechanical mechanism that phisically switches one path to another as depicted.  The funciton depicted is actually implemented with two different solid state switches that are either on or off.  One of these switches is optimised for passing USB data and the other optimised for audio signals.  The datasheet is correct that there are two different values since there are two switches inside optimised for different fucntions. 

Q2. Input Impedance in the Power-off
Would you tell us the input impedance of D+/R, D-/L, D+, D-, R and L in the power-off ?  Is our understanding correct although we believe that it is Hi-Z.

Yes, you can see when VBUS is = 0 V that there is minimal leakage current through the device.

Q3. Input Signal Clipping in the power-off
Would you tell us whether the input signals(4Vpp@grounded center) are clipped by the esd protection diodes if they are input to D+/R, D-/L, R and L in the power-off ?
Moreover, would you tell us the clipped voltage if clipping ?

If you have the switch powered off VBUS = 0V you will not have clipping because you will not have a signal passing through the device

Adam

Hi Adam-san,

Thank you for you reply.
Could you please give me your advice again since I would like to grasp the absolute maximum ratings and the input impedance for these pins of D+/R, D-/L, D+, D-, R and L in the following condition.

<Condition>
Asel   = 0V
Vaudio = 0V
Vbus   = 0V

Q1. Absolute Maximum Ratings
D+/R = ?V to ?V @ all power-off
D-/L = ?V to ?V @ all power-off

Q2. Input Impedance
D+/R = ?ohm @ all power-off
D-/L = ?ohm @ all power-off
D+   = ?ohm @ all power-off
D-   = ?ohm @ all power-off
R    = ?ohm @ all power-off
L    = ?ohm @ all power-off

Best regards,
Kato

Hi Adam-san,

Thank you for you reply.
I have one more request for you.
Could you please evaluate whether the input signals(4Vpp@grounded center) are clipped by the esd protection diodes for our test conditions since I would like to grasp whether TS5USBA224 has them on the terminal of D+/R, D-/L, D+, D-, R and L ?
I am looking forward to hearing from you.

Best regards,
Kato

Hi Adam-san,

Thank you for supporting so politely.
I am looking forward to hearing from you.

Best regards,
Kato

Hi Adam-san,

We must judge whether TS5USBA224 is able to use, inform our customer of your information.
Your quick response would be greatly appreciated.

Best regards,
Kato

Hi Adam-san,

Thank you for evaluating.
In addition, could you please evaluate the input impedance of D-/L and D+/R terminals which are the usb/audio common connector in the same conditions ?
I could not find the analog voltage range for D-/L and D+/R terminals when the device is powered off although the analog voltage range for VD+, VD- VR and VL terminals is mentioned on page 5 of the data sheet as below.
So, would you tell me your recommended analog voltage range and  the dielectric strength for the D-/L and D+/R terminals in the power-off ?
Moreover, are the input signals clipped by the esd protection diodes if inputting 4Vpp@grounded center to D-/L and D+/R terminals ?

Best regards,
Kato

Kato-san,

In addition, could you please evaluate the input impedance of D-/L and D+/R terminals which are the usb/audio common connector in the same conditions ?

The TS5USBA224 is an unbuffered bi-directional swtich.  The impedance of the D-/L and D+/R is going to be the same as D-, L, D+, and R since the resistance measurement is from drain (D-/L and D+/R) to source (D-, D+, R, and L) of the internal FET no matter which way you are looking into the terminals.    

I could not find the analog voltage range for D-/L and D+/R terminals when the device is powered off although the analog voltage range for VD+, VD- VR and VL terminals is mentioned on page 5 of the data sheet as below.  So, would you tell me your recommended analog voltage range and  the dielectric strength for the D-/L and D+/R terminals in the power-off ?

I appologize for the datasheet not being clear.  The TS5USBA224 is an unbuffered bi-directional swtich so the D-/L and D+/R terminals will have the same dielectric strength and limitations as the D+, D-, R, and L terminals.  The limitation of these terminals is stated in the absolute maximum ratings

 Moreover, are the input signals clipped by the esd protection diodes if inputting 4Vpp@grounded center to D-/L and D+/R terminals ?

Only the L and R Audio path can handle a negative voltage signal.  These 2 L and R FETs are slightly different than the 2 FETs on the D- and D+ paths to accomodate the negative voltage. 

Thank you,

Adam 

Hi Adam-san,

Thank you for explaining in detail.
Could you please give me your advice more concretely regarding the dielectric strength of D-/L and D+/R terminals ?
I believe that the dielectric strength of D-/L and D+/R terminals is "Vaudio - 6.5V to 6.5V" since the usb switch state is "off" and the audio switch state is "off" when the device is powered off.
Is my understanding correct although my thought is shown in the following table ?
Could you please tell me the correct value if that is incorrect ?

In addition, are the input signals clipped by the esd protection diodes if inputting 4Vpp@grounded center to D-/L and D+/R terminals when the device is powered off with the non-signal input for D+, D- R and L terminals ?
Could you please evaluate it by using your test board ?

Your quick response would be greatly appreciated.

Best regards,
Kato

Kato-san

Remember we are talking about absolute maximum ratings and that we do not recommend opperating this device through the ranges in the table provided in the previous post.

In addition, are the input signals clipped by the esd protection diodes if inputting 4Vpp@grounded center to D-/L and D+/R terminals when the device is powered off with the non-signal input for D+, D- R and L terminals ?

No, based on the test data provided above the device input/outputs show high impedance when the device does not have power. 

Adam

Hi Adam-san,

Thank you for your quick response.
Could you please concretely revise my incorrect understanding in the table which I mentioned although I understood that the device is not able to use when that is powered off ?
Our use case which we is considering is shown as below again.
I considered that the input signals clipped if TS5USBA224 has the esd protection diodes for D-/L and D+/R terminals since I would like to pass the audio source to an additional audio amp when that is powered off.
So, I asked you those question.

Best regards,
Kato

Kato-san,

I considered that the input signals clipped if TS5USBA224 has the esd protection diodes for D-/L and D+/R terminals since I would like to pass the audio source to an additional audio amp when that is powered off.

When the device is powered off, D-/L and D+/R = Hi-Z as shown in the data in the previous posts.  You may place an audio amp on the bus as you depicted.   

Thank you,

Adam

Hi Adam-san,

Thank you for your response.
Could you please tell me your recommended input voltage range for the pins of D-/L and D+/R when adding the external audio amp in the powered off(Vaudio = 0V) ?
Your quick response would be greatly appreciated.

Best regards,
Kato

Hi Adam-san,

Thank you for your reply even though you are busy.
I understood and greatly appreciate your cooperation.

Best regards,
Kato