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DS26C32AT: Input fail-safe circuit

Ryuichi Nagasako
Prodigy 10 points
Part Number: DS26C32AT

Tool/software:

Hi, E2E team

I have a question about input fail-safe circuit.

The Japanese data sheet (Rev.B)has the following description,

Input fail-safe circuit（input open ,no termination resistor , ouput "H")

The English data sheet (Rev.C) does not describe the input fail-safe circuit, is the circuit itself gone?

Best Regards,

Nagasako

  • 0
    Guru 300740 points

    The truth table on p. 6 describes this case with "open".

  • 0 in reply to Clemens Ladisch
    TI__Guru 73102 points

    Nagasako-san,

    The image isn't loading, but from the written description, Clemens is correct. This is described on page 6 of the English datasheet. Please let us know if you have any other questions.

    Regards,

    Eric Hackett 

  • 0 in reply to Eric Hackett
    Prodigy 10 points

    Hello、Eric-san

    Thank you for your quick answer.

    Excuse me, please ask me one more question to confirm.

    In the following circuit, the processing of unused pins（4A,4B) is open and there is no problem, right?

    Best Regards,

    Nagasako

  • 0 in reply to Ryuichi Nagasako
    Guru 300740 points

    In the circuit shown abovr, there are no dots at the ends of the two red lines, but it could be interpreted as if 4A and 4B were connected +5V. (This would be wrong; the output would be undefined, and might even oscillate.)

    If 4A/4B are not connected to anything, then they indeed are open.