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SN65LBC176-Q1: Supported maximum data rate

Ryuuichi machida
Guru 11655 points
Part Number: SN65LBC176-Q1

Hi

I would like you to confirm about supported maximum data rate of SN65LBC176-Q1.

According to production page, signaling rate (max) is defined as "10Mbps", but there is no description about this in datasheet.

https://www.ti.com/product/SN65LBC176-Q1

Also, SN65LBC180-Q1 have no information about data rate (signaling rate (max) is defined as "30Mbps" in prodcution page) in datasheet.

Could you please tell me which document you referred to describe this information to production page ?

Best Regards, 

  • 0
    TI__Guru 62910 points
    Hello Machida-san,

    In general, the maximum signaling rate of a transceiver is a function of its output transition times. There isn't a firm formula for translating transition times to signaling rate, though. At an extreme limit, the maximum data rate (minimum bit period) would be just enough time for an output to switch from a previous state to a new state and then transition back. For data integrity, though, it is usually better to allow the bits to remain at a steady-state value for some time. One common rule of thumb is that the rise and fall times of the signal should each be no more than 1/3 of the bit period.

    It looks like the transition times of the LBC180 and LBC176 are actually fairly similar to one another despite the different data rates shown in the product folder. The differences in the data rates you see is due to a difference in the way the maximum data rates are derived, then. In the case of LBC176 the estimation is conservative, while in the case of the LBC180 the estimation seems aggressive.

    Max
  • 0 in reply to Max Robertson
    TI__Expert 4555 points

    Hi Max-san,

    I checked production page again, then I noticed about below.

    * In case of SN65LBC180-Q1, it seems Signaling rate and HBM are referred "A version" (not "non-A version").

      And also case of SN65LBC176-Q1, it seems HBM is referred "A version" (not "non-A version").

    So, data rate of both SN65LBC176-Q1 and SN65LBC180-Q1 should be same.

    And also, HBM of ESD spec are same b/w SN65LBC176-Q1 and SN65LBC180-Q1.

    Could you please confirm whether this understanding is correct or not ?

    Best Regards,

  • 0 in reply to Ryuichi Machida
    TI__Guru 62910 points

    Machida-san,

    You are correct that LBC176-Q1 and LBC180-Q1 can support similar data rates because they have similar transition times.  The HBM ESD specs are similar as well, although these are independent specifications not related to any other datasheet parameters.  (The HBM level is a function of the transient protection implemented on a particular device.)

    Regards,
    Max