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CD4504B: The maximum rating of output

Hirotaka Matsumoto
Guru 27585 points
Part Number: CD4504B

Hi all

Would you mind if we ask CD4504B?
How much is the maximum rating of output?
Is it -0.5V to VDD+0.5V?

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Genius 16735 points
    Hi Hirotaka,

    I do notice that the maximum rating of the output is not specified on the datasheet. I am investigating for you to find out an exact answer.
    I should have an answer for you by tomorrow.

    Thank You!
    - Karan
  • 0
    TI__Genius 16735 points

    Hi Hirotaka,

    When you say maximum rating of the output. Are you looking to apply voltage to the output of the device or do you want to know what the maximum output of the device is?

    Thanks!
    -Karan

  • 0 in reply to Karan Kotadia
    Guru 27585 points

    Karan san

    Thank you for your reply.

    Are you looking to apply voltage to the output of the device or do you want to know what the maximum output of the device is?
    ->We would like to know the maximum voltage ratings at output pins like as 2, 4, 6, 10, 12, and 15 pins.
       For example, VDD is applied 16V, is the maximum rating of output pins -0.5V to 16V+0.5V?

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Guru* 97046 points
    Hello Matsumoto-san,
    If you are externally applying a voltage to the output pin, we recommend against driving the same line with two devices - this is called bus contention and can cause damaging currents to flow in both devices. This device does not have a high-impedance mode, and it does not have Ioff, so the output should not exceed VDD.

    If you need to know how much voltage the device will output, you can expect to get VDD at the output under DC conditions, and overshoot beyond VDD can be caused by light or inductive loads.
  • 0 in reply to Emrys Maier
    Guru 27585 points

    Emrys san

    Thank you for your reply!

    The customer measured the minus transient value at output.
    The value was -0.8V, -100ns.

    So, it will be over absolute maximum ratings.
    Does the device damage?

    We assume that the internal circuit contains confidential content.
    For example, If Vout is -0.5V upto VCC+0.5V, does "0.5V" mean diode which is output to VCC?

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    Guru 27585 points

    Hi all

    If you have some update, could you share us?
    If the question invade the confidential contens, we will accept that there is no answer.

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Genius 16735 points

    Hello Matsumoto-san,

    This is the diode protection on the inputs and outputs as shown in the datasheet.

    There is a diode on the output that goes to the negative side.

    You have to make sure that the current on the output doesn't exceed 50mA.

    Thanks!

    - Karan