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PCA9306: Two PCA9306 connected together

Shenhua Zhang
Prodigy 640 points
Part Number: PCA9306

Customer would like to confirm:

1. Could they use two pcs of PCA9306 to replace TAC9617B below, and connected like below? Any concerns with the connection of "1" and "2" side?

2. Any layout suggestions/concerns if the frequency of signals goes up to 1MHz? 

  • 0
    TI__Guru 62920 points

    Hello,

    It is OK to connect multiple PCA9306 devices in parallel as long as you make sure that VREF2 is greater than or equal to VREF1. Since this device uses a passive switch architecture rather than an active buffer, the load capacitance on both sides should be considered when choosing pull-up resistance values. The RC constant of the pull-up resistance in conjunction with the load capacitance would be the primary limiting factor to data rate.

    Regards,

    Max