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TCA9800: Difference between Buffer/Repeater and Translator

R.Fukunaga
Expert 2625 points
Part Number: TCA9800
Other Parts Discussed in Thread: TCA9517A, , TCA9416, PCA9306, P82B96, TCA9617B

Tool/software:

Hi all,

TCA9800 and TCA9517A are Buffer/Repeater is described in the title of the data sheet.

TCA9416 and PCA9306 are Translator is described in the title of the data sheet.

Are there any functional differences between these? Is Buffer/Repeater better when connecting boards with cables?

Best Regards,

Ryusuke

  • +1
    TI__Mastermind 49968 points

    Hi Ryusuke,

    Buffers/repeaters re-drive the I2C signal and separate current and capacitance. 

    Translators are usually passthrough devices which do not separate current or capacitance. 

    When connecting long cables, it depends on the length of the cable. 

    A pair of P82B96's is an expensive solution, but can buffer/re-drive I2C up to 4000pF of long cabling. 

    The TCA9617B is a cheaper alternative to re-drive I2C across cabling. This buffer can be used between boards. 

    I would not recommend TCA9800, TCA9416, PCA9306 for long cable applications. 

    REgards,

    Tyler