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SN74LV4052A: What would be the state of the common channel if SN74LV4052A is unpowered, VCC=0?

Joaquin Gonzalez
Expert 1200 points
Part Number: SN74LV4052A
Other Parts Discussed in Thread: TS3USB221

Dear all,

My question might be a little silly.

What would be the state of the common channel if the device is unpowered VCC=0 and with INH=L, but the inputs (ch0, ch1, ch2, ch3) still receive a signal (let's say a PWM). Is the common output isolated from the inputs in this case?

Thank you,

Best regards,

Nuba

  • 0
    TI__Expert 3900 points

    Hi Nuba,

    This question is very common here on E2E. The feature you are asking about is called powered off protection or Ioff Protection. The device you are looking at does not have this feature so we cannot guarantee the state of the common channel when Vcc = 0V.

    If you need a device that goes into Hi-Z state when Vcc = 0V you need to look for a device with this Ioff protection. An example is shown from the TS3USB221.

    If this feature is needed we can help you select the right device if you can list your design parameters and end application.

    I have also linked a few similar E2E posts.