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DS64MB201 - What to do with the unused channel input/output pins.

Kawai
Guru 19785 points
Other Parts Discussed in Thread: DS64MB201

Hi, please tell me what to do with the unused input/output channel pins of DS64MB201.

 1) SIA and SIB, DIN0 and DIN1 input pins

    --> As the input have signal detect circuitry, leaving OPEN seems to be the best way.

 2) SOA ans SOB, DOUT0 and DOUT1 output Pins

    --> If there is no input, output would be muted,  so leaving OPEN seems to be the best way.

What is the recommended connections for these unused pins ?

Is my recognition correct ?

Best Regards,

Kawai

  • 0
    TI__Mastermind 20820 points

    Hi Kawai,

    It is always good practice to tie unused input pins on a device to a know state such as Vcc or GND. This will prevent the output channels from chattering reducing the possibility of any cross talk between channels or any unnecessary noise. It is OK to leave the outputs floating.

    Regards,

    Mike

  • 0 in reply to Michael Peffers
    Guru 19785 points

    Mike-san,

    Thank you for your reply.

     

    I understand that leaving open for DS64MB201 is not recommended.

    How about if the customer sets the unused channel in power down mode through SMBus ? Can you leave the input pins open in this case ?

     

    I understand that the recommended input pin connection for this device would be "Connect IN+ and IN- pin to VCC directly" .

    * If you connect the input pins to GND, the internal termination resistor 50Ohm in each pin will lead to leak current.

      Ileak = 2.5V / 50Ohm = 50mA

    Best Regards,

    Kawai

  • 0 in reply to Kawai
    TI__Genius 13475 points

    If the channel is in power down mode, then the inputs can be left open.

     

  • 0 in reply to Mark Sauerwald88474
    Guru 19785 points

    Mark-san,

    I apologize for my delay.

    Thank you for the answer.

    Customer will OPEN the High Speed Input/Output pins and power down the unused channel. 

    Please let me ask again in the following case.

    If the customer uses the DS64MB201 in PIN Mode, each channel would not be able to power down.

    In this case, what is the best pin connection for the high speed signal input ?

      

    Is Connecting to VDD directly, the best way ?

    Best Regards,

    Kawai