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TMUX136: 1.8V on A1,A2,B1,B2 when Vcc = 0V

Johan Gjellan
Prodigy 380 points
Part Number: TMUX136

Hi, 

My customer is wondering if he can get 1.8V on the A1,A2,B1,B2 pins when Vcc = 0V and an external chip is driving the data lines A1,A2 or B1,B2? 

Does this snip below from the DS answer this question? 

Thanks and best regards,

Johan

  • +1
    TI__Mastermind 47888 points

    Hi Johan,

    You are correct. The absolute max condition for input/output DC voltage is not dependent on the supply voltage VCC. Therefore, when VCC = 0V, your I/O pins can be between -0.3V and 5.5V. I would go off of the recommended operating conditions instead so that you do not accidently push the device over its abs. max ratings. 

    Another way to see if this is okay is to check the power-off leakage current (IOFF) spec. This is the same test setup as shown in Figure 7-3 of the datasheet for the IOZ spec, except VCC = 0V. 

    When VCC = 0V and voltage on A1/A2 is ramped from 0V to 3.6V, we see a small amount of leakage appear on the COM pin, telling us there is separation between I/O pins. 

    Also, this FAQ is a helpful resource for answering the most commonly asked questions about our switches and multiplexers portfolio.

    Regards,

    Tyler

  • 0 in reply to Tyler Townsend
    TI__Prodigy 380 points

    Thank you Tyler, this answers my questions!

    /Johan