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TCA9517A: About TCA9517A

user6448843
Prodigy 160 points
Part Number: TCA9517A
Other Parts Discussed in Thread: TCA9517

Tool/software:

◆Question

　This device (TCA9517A) and the TCA9517 have the same terminals.

　Are the internal specifications the same?

　Is the TCA9517A a suitable replacement for the TCA9517?

Best regards

  • 0
    Guru 318050 points

    The datasheet says:

    The TCA9517A offers a higher contention level threshold, VILC, than the TCA9517, which allows connections to slaves which have weaker pulldown ability.

  • 0 in reply to Clemens Ladisch
    Prodigy 160 points

    ◆Additional questions

    ＞The TCA9517A offers a higher contention level threshold, VILC, than the TCA9517, which allows connections to slaves which have weaker pulldown ability.

    ⇒ In other words, can a larger pull-up resistor be connected to the TCA9517A compared to the TCA9517?

    Also, other than VILC, are there any other specification differences compared to TCA9517?

    Best regards

  • 0 in reply to user6448843
    Guru 318050 points

    Both TCA9517 and TCA9517A support many different pull-up resistors. The question is how low the worst-case VOL of your other I²C devices is.

    As far as I can see, there are no other differences.

  • 0 in reply to user6448843
    TI__Guru 51598 points

    User6448843,

    user6448843 said:

    ＞The TCA9517A offers a higher contention level threshold, VILC, than the TCA9517, which allows connections to slaves which have weaker pulldown ability.

    ⇒ In other words, can a larger pull-up resistor be connected to the TCA9517A compared to the TCA9517?

    "larger pull-up" as in stronger pull-up yes. Stronger means smaller resistance value which would push the VOL higher. VILC = 0.45V allows for more margin here. 

    user6448843 said:
    Also, other than VILC, are there any other specification differences compared to TCA9517?

    VILC is the only change. 

    Regards,

    Tyler