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AM26LS31: Output Z question

Part Number: AM26LS31

Team,

My customer has a question about this device: The question: 1A surge, when the transistor is on, if he puts a surge on Output Z, what is going to keep the schotkey from drawing excessive current? He would also like to know the resistor values tied to Output Z inside the device.

Regards,

Aaron

  • Aaron,

    I have several questions for you. When the transistor is on, do you assume output Z is logic L? Which schotkey and resistor were you referring to? I'm not sure if the driver output can take 1A surge.

    Regards,

    Hao

  • When the transistor is on, do you assume output Z is logic L? >>> the marked transistor

    Which schottkey and resistor were you referring to? >>> the three resistors marked with an "R"; no schottkey

    I'm not sure if the driver output can take 1A surge. >>>> even for a duration of 33 microseconds?  The surge is a damped sine wave

  • Aaron,
    I will try to dig out the resistor values, but cannot guarantee to be successful. 1A surge with 33us is a big current for IC. You can refer to this note (www.ti.com/.../tiduas1a.pdf) for details. So far SNx5LBC184 are the only RS485 transceivers with built in surge protection.
    Regards,
    Hao
  • Aaron,
    I haven't been able to find the resistor values. But you have any more questions about ESD protection, please let me know.
    Regards,
    Hao