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CD4067B: Output error

Keval Desai
Intellectual 590 points
Part Number: CD4067B
Other Parts Discussed in Thread: MSP430F6736, MUX506

Hi team,

I am working with CD4067B on a project. I am sending the select signals A,B,C,D and the inhibit signal using msp430f6736. However, I am unable to switch the input lines using the select signals. I get the output from the mux as the input it gets on line 0(pin#9) even when I change the select signals to a different number. Even if I change the inhibit signal to logic 1, the mux selects line 0 and shows me the output as the output that is on line 0.

Here is the circuit that I have connected. The inputs coming to the multiplexer are analog input lines of 0-1V range.

Is there an error in the circuit?

Could you help me out with the issue I am facing?

Thank you,

Keval

  • 0
    TI__Mastermind 45420 points

    Keval,

    The Vih and Vil control logic thresholds are proportional to VDD.  Since you have VDD at 12V you will need to supply a voltage greater than 7V to the control logic pins Enable, A,B,C,D.

    What do you think about using the MUX506 instead?  This device is a 16:1 multiplexer but the logic control pins are not referenced to Vdd and you may use 3.3 V logic to toggle the switch.

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    Intellectual 590 points
    Hi Adam,

    Could you suggest me an equivalent IC with the same package but one that'd serve my purpose of driving the select signals through 3-3.3V?

    Thank you for the help Adam.
    Appreciate it.
  • 0 in reply to Keval Desai
    TI__Mastermind 45420 points
    Keval,

    We don't have an equivalent IC with the same package at this time that'd serve your purpose of driving the select signals through 3-3.3V.

    MUX506 is a good option available to today.

    Thank you,
    Adam