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I/O current max.

Thomas Chang15933
Expert 4770 points
Other Parts Discussed in Thread: TCA9555

Dear Team:

    Customer asked us about TCA9555 I/O max. current (50mA).

 If I/O is output, and connect to GND, whether TCA9555 will be damaged?

If yes, why our TCA9555 datasheet showed max. current is 50mA that should be limited current, not to damage chip.

Could you reply me the issue?

  • 0
    TI__Guru 62920 points
    Hi Thomas,

    Yes, the output current should be limited externally to prevent damage to the IC (which could occur beyond the +/- 50 mA absolute maximum range). You can see the recommended operational limits for the high-level and low-level output currents in Table 7.3 of the datasheet (reference the IOH and IOL specifications). Additionally, it is recommended not to exceed 100 mA in total for any 8-port octet (i.e., P07-P00 or P17-10).

    I hope this is clear; please let me know if you have any questions.

    Regards,
    Max
  • 0
    TI__Mastermind 23156 points
    Hello Thomas,
    There is NO current limiting circuitry in the device. You definitely can damage the IO port if you exceed the abs max current rating. You need to make sure in your application you don't exceed that current or else risk getting the device damaged.
    -Francis Houde
  • 0 in reply to fhoude
    TI__Expert 4770 points

    Dear Team:

     Thanks for your reply.

    Do we have similar product that embedded limit circuit?

     Becasue customer application sometimes I/O pin connect to gnd.

  • 0 in reply to Thomas Chang15933
    TI__Guru 62920 points
    Hi Thomas,

    I'm unfortunately not aware of a similar device that integrates a current limit. Have you considered placing a resistance in series with the output ports? A 100-Ohm resistor would effectively limit the short-circuit current to below the absolute maximum rating.

    Max