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Original question:

TCA9548A: Support up to eight slave

TCA9548A: VCC range based on the VDPUM and VDPU

Matt Qi
Expert 4510 points
Part Number: TCA9548A

Hi team,

My customer has an application for TCA9548A that I would like to ask you about:

Master side VDPUM=3.3V,

Slave side VDPU0=3.3V, VDPU1=1.8V,

Is it okay to have VCC=3.3V? If not, is it okay to have VCC=2.5V or VCC=1.8V?

  • 0
    TI__Mastermind 35638 points

    Hey Matt,

    The Vpass(V) voltage would need to be equal or below your lowest bus voltage. So in this case you lowest  bus voltage is 1.8V. At 3.3V, the vpass on figure 14 looks like it's right at 2V. 
    At 2.5V = VDD the Vpass is about 1.5V and even less for 1.8V so these two should work fine but 3.3V wouldn't be. 

    Thanks,
    Rami