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SN65LVDS302: About Input rise and fall time (tR/F)

Tsukui Yusuke
Guru 21930 points
Part Number: SN65LVDS302

Hi,

Could you tell me about tR/F spec?
The following contents are described in the data sheet.

However,My customer wants to know the capability value.

Could you please let us know the ability distribution of tR/F specification for our reference?

How is range of distribution of maximum and minimum?  

We will explain it and try to make a understand to customer.

 

I appreciate your cooperation and thanks in advance.


Best Regards,
Yusuke/Japan Disty




  • 0
    Guru 21930 points

    Hi,

    Can I get the information?
    Customers need that information for design.
    If you need more information or if  I should  clarify my comment ,
    please let me know.

    Best Regards,
    Yusuke/Japan Disty

  • 0 in reply to Tsukui Yusuke
    TI__Mastermind 43795 points

    Hi

    The LVDS302 has high preformance data and clock inputs.  If the input signal rise and fall time is too slow it will begin to impact the device performance characteristics.  To meet the datasheet specifications, the input rise and fall time should be less than 800ps.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Guru 21930 points

    Lee-san,

    Thank you for your support.
    If the input rise and fall time is higher than 800ps,
    Can this device operate?
    Also, Could you tell me about the operation concerns when it is over 800 ps?

    I understand that it can not be guaranteed.
    However,Customer wants to know the actual value.

    Best Regards,
    Yusuke/Japan Disty

  • 0 in reply to Tsukui Yusuke
    Guru 21930 points

    Hi,

    I believe that if tr/tf is even higher(slower) than 800ps, something like 850ps or 900ps,
    some device may receive the signal correctly and operate normally.
    However, since there is a process variation, datasheet is stating 800ps as a max value to guarantee operation.
    Is my recognition correct ?

    Best Regards,
    Yusuke/Japan Disty

  • 0 in reply to Tsukui Yusuke
    TI__Mastermind 43795 points

    Hi Yusuke,

    Yes the devices will definately still operate.  There will be a very slow degradation of performance as the input edge rate gets slower than 800ps.  Even at 900ps it is likely most devices will operate okay.  The overall performance will be more suseptible to noise, jitter, timing, and other system variations.

    Regards,

    Lee