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Original question:

MAX3243E: About unused terminal processing at the Dout port.

MAX3243E: When the Dout is connected to GND.

Kengo.Y
Guru 11435 points

Part Number: MAX3243E

Hi Hao.

Could you pls give me more advice?

Are there problem to fail the device when the output is connected to GND?

According to your advice in E2E(https://e2e.ti.com/support/interface/f/138/t/784169?tisearch=e2e-sitesearch&keymatch=max3243%20unuse#pi320995filter=all&pi320995scroll=false) ,

it may start drawing current with input=L. .

Is the current ever increasing with input=L?

Or, is your mean just leakage current ?

Could you tell me the meaning of increasing current?

Sincerely.

Kengo.

  • 0
    TI__Mastermind 25705 points

    Kengo,

    When input is L, the driver output is H (assume the driver is enabled). In this case, if you short it to ground, the driver would be drawn lots of current. If the current is too large, the driver would be in Ios state, which means the maximum current out of it is capped. Please let me know if it makes sense to you.

    Regards,

    Hao

  • 0 in reply to Hao L
    Guru 11435 points

    Hao,

    Thank you for your quick response.

    Could you give me more advice?

    Because in our circuit, the Dout(1port) may be shorted.

    1.How much maximum current when it is capped?
       Is it a ±60mA ?
    2.Can I calculate the device absolute power dissipation ratings?

    3.Please tell me the condition if you are conducting long-term reliability test by short circuit.

       I want to know the current and test time of the long-term reliability test.


    Sincerely.
    Kengo.

  • 0 in reply to Kengo.Y
    TI__Mastermind 25705 points
    Kengo,

    Yes, Ios (±60mA) is the maximum current. But short current is not normal operation, which should be controlled not to exceed the device's abs max power dissipation. TI doesn't conduct long term reliability test by short circuit. You can find more information about TI's reliability test on this page (www.ti.com/.../estimator.tsp.

    Regards,
    Hao
  • 0 in reply to Hao L
    Guru 11435 points
    Hao.
    Thank you so much for your reply.
    I understood.

    Sincerely.
    Kengo.