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TS3DV642: Where to place 47k pull up resistor for HDMI sink application

Kawai
Guru 19775 points
Part Number: TS3DV642

Hello Team,

Could you please allow me to ask you about the pull up resistor, 47k Ohm, using in HDMI sink application ?

TS3DV642 is used as 2:1 HDMI MUX in sink application. I found below figure and description in the datasheet.

Here is my question.

[Question]
Below Figure 27 is an example of Source application. In this example it says pull up resistor must be placed on the source side DDC.
Does Sink application also have this limitation where to place 47k Ohm pull up ?
(i.e. User must place pull up to connector side of TS3DV642.)

Thanks in advance.

Best Regards,

Kawai

  • 0
    TI__Mastermind 45430 points

    Kawai,

    The TS3DV642 may be operated correctly without any external components because it is a simple bidirectional pass FET switch.  The line in the datasheet about placing pull up resistors is referring to the HDMI system requirements needing pull-ups on both the source and sink side.   

    When the TS3DV642 signal path is connected and conducting it will not matter which side the pull up resistors are placed because you can think about the connected switch like a 0 ohm wire. 

    When the TS3DV642 signal path is open and high impedance only the side of the device with the pull ups will be logic "high".   The side without pull up resistors  will be floating. 

    If your system needs to keep both sides of the switch from floating when the TS3DV642 is in Hi-Z,  you could put pull up resistors on both sides of the TS3DV642 but remember that those restores will be in parallel when the switch is conducting and total resistance value 50%. 

    Thank you,

    Adam