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PCA9548A: Primary & Secondary Bus Loading...

Randy May
Prodigy 70 points

Part Number: PCA9548A

Greetings,

I'm using a PCA9548A in my design and I am concerned about keeping the bus capacitance below 400pf.  Do I need to consider the bus capacitance on the primary side + the secondary, or is there isolation between the two?

Thanks

  • 0
    TI__Guru* 78201 points
    Hello Randy,

    "Do I need to consider the bus capacitance on the primary side + the secondary, or is there isolation between the two? "
    -The two sides are isolated if the switch/channel for the secondary side is disabled. If the channel for the secondary side is ENABLED then there is no isolation between the two and the capacitance on both sides will sum together.

    Thanks,
    -Bobby