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TCA9517: TCA9517 and TCA9617A

Nanfang Liao
Intellectual 2085 points
Part Number: TCA9517
Other Parts Discussed in Thread: TCA9617A, , TCA9617B

Hello team,

Can you share me what's the difference between TCA9517 and TCA9617A? thanks

Regards,

Nanfang

  • 0
    TI__Prodigy 255 points

    Hi Nanfang,

    These devices both support level shifting and signal buffering - the difference is that the TCA9517 supports Fast Mode (400kHz), while the TCA9617A is able to support Fast Mode Plus (up to 1MHz).

    Hope this helps.

    Regards,

    Kaitlyn

  • 0
    TI__Genius 17205 points
    Hello Nanfang,
    The main difference is that the TCA9617 can support higher data rates (Fast Mode +) due to smaller resistance pull down FET which supports the lower resistance pull downs needed to operate at higher frequencies. This stuff is covered in the description of the device on the 1st page and is also shown in the parametric comparison tool.
    -Francis Houde
  • 0 in reply to fhoude
    Intellectual 460 points
    Hi Fhoude,

    TCA9617's datasheet talks about the pedestal and inverted pedestal. However, TCA9517's datasheet doesn't mention this. Is that meaning pedestal or inverted pedestal will not happen on the design using TCA9517? Please comment. Thanks.

    Regards,
    S.P. Lin
  • 0 in reply to user446310155
    TI__Genius 17205 points
    Hello S.P.Lin,
    The TCA9517 does not have this pedestal. The TCA9617 needs to support Fast Mode Plus so that circuit was done to reduce the fall time to help with timing.
    -Francis Houde
  • 0 in reply to fhoude
    Intellectual 460 points
    Hi Francis,

    I also checked the datasheet of PCA9617 and seems PCA9617 doesn't have the pedestal as well. And I just did a comparison among TCA9617, TCA9517 and PCA9617, I found only TCA9617's A-side detects 0.7VCCA for a quick H to L edge on B-side. Am I correct? If yes, what's the pros and cons between the implementations of TCA9617 and PCA9617?

    Regards,
    S.P. Lin
  • 0 in reply to user446310155
    TI__Genius 17205 points
    Hello S.P.Lin,
    The TCA9617B has much faster/stronger pull down strength than PCA9617 (competitors) and it supports full Fast Mode Plus for all capacitive loading and supports 30mA vs our competitors 20mA.
    -Francis Houde