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Original question:

TS5MP646: TS5MP646 Application Clock Direction

TS5MP646: TS5MP646 Application Clock Direction

adam mckee
Prodigy 30 points
Part Number: TS5MP646
Other Parts Discussed in Thread: SN75DPHY440SS

Hi Adam ,

You say the TS5MP646 device is a passive switch . So my understanding of your use of passive in this context is that no other inputs  determine the (enabled) output .

In a different context ,to my understanding , elements that are passive degrade signal quality, where active (buffer/drivers) elements recondition and enhance signal quality ....Hence my question. :

I would like to extend the 'reach' of a mipi interface . I believe 25-30 cm is the spec for MIPI . Is the TS5MP646 an appropriate choice for this type of application ? If so, what PHY specs does it support : 

1.1, 1.2 ...etc.  

With a 0.4 mm / 15 mil pitch w/ the recommended pad size of .23 mm dia ,  what are the escape routes trace thickness expected to be  : 3 mils or 4 mils ? should we neckdown on the escape and risk impedance mismatches , hence signal quality or keep the trace consistent from ball. Thank you in advance ..

best,a

 

  • 0
    TI__Mastermind 45340 points

    Adam,

    The TS5MP646 device is passive as it doesn't have any current source or sink capability.  As you mentioned passive devices degrade signal quality and the parasitic effects of the TS5MP646 signal path are stated in the datasheet.

    The TSMP646 device is a 2:1 switch used when you have one PHY needing to communicate to multiple locations.  The TS5MP646 will not improve the transmission of a signal and you will need to find an active redriver.  I have notified that team to respond with a recommendation.  

    The TS5MP646 device will support any signal standard as long as it is within the recommended bandwidth and voltage.  You can see this post for more information.  We have also seen customers use this device for LAN switching protocols and low speed protocols like UART and I2C.  

    In our first set of characterization boards we used 4mil traces but the manufacture has asked us to increase to 5mils for the new boards.  I would recommend using what ever trace width gives you the desired impedance control performance from the board manufacture at the cost you desire.  

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    Prodigy 30 points
    Hi Adam,

    Thank you for your response ....

    It appears SN75DPHY440SS is more suitable for the application . The PHY is DPHY 1.1 ....Does TI have a DPHY 1.2 /2.5 G ?


    I look forward to hearing more from your team about recommendations or getting samples/datasheets of advanced / pre released devices .

    thnx,adam
  • 0 in reply to adam mckee
    TI__Guru*** 139835 points
    Adam

    Unfortunately, at this moment, we do not have a DPHY1.2/2.5G part.

    Thanks
    David