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TCA9517 in series

takishin
Expert 2360 points

Other Parts Discussed in Thread: TCA9517, PCA9515A

The datasheet menｔions multiple TCA9517s can be connected in series 

as long as the A side is connected to the B side.

I guess that TCA9517 cannot be connected A-side to A-side in series.

What is the reason?

Thanks in advance.

takishin

  • 0
    TI__Mastermind 30310 points

    Takishin,

    Page 2 of the datasheet says, "This type of design on the B side prevents it from being used in series with the PCA9515A and another TCA9517 (B side). This is because these devices do not recognize buffered low signals as a valid low and do not propagate it as a buffered low again."

    An A-side to A-side connection is allowed, but doing so would prevent you from connect more than 2 in series.

    This is why A-side to B-side connections are shown in Figure 8 on the datasheet.

  • 0 in reply to Brian Berner
    Expert 2360 points

    Thank you for your answer.

    Best regards,

    takishin