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DS26LS32AC: Equivalent Schematics of Differential Input

Expert 8750 points

Part Number: DS26LS32AC

Hi team,

My customer wants to get equivalent schematics of DS26LS32A differential input
in order to review and fix the old designed external fail-safe circuit of the device.

Please provide the equivalent schematics.

Best regards,
Fumio Nakano

  • Fumio,

    I'm looking into this. I will get back to you soon. Can you also advice what your customer cares, like the input impedance?

    Regards,

    Hao

  • Expert 8750 points

    In reply to Hao L:

    Hi Hao-san,

    Thank you for your quick reply.

    The customer wants to get the equivalent schematics like AM26LS32A below.

    Best regards,
    Fumio Nakano

  • In reply to F.N:

    Fumio,
    You can use the same schematic by making some changes: 1) removing 100kOhm pull up / pull down resistors, 2) changing 20kOhm to 7.2kOhm, 3) changing 960Ohm to 900Ohm. Please let me know if you have more questions.
    Regards,
    Hao
  • Expert 8750 points

    In reply to Hao L:

    Hao-san,

    Thank you for your answer.

    Is the equivalent circuit diagram below correct?

    Best regards,
    Fumio Nakano

  • In reply to F.N:

    Fumio,

    Yes. The schematic is correct.

    Regards,

    Hao

  • Expert 8750 points

    In reply to Hao L:

    Hao-san,

    Thank you!!

    Best regards,
    Fumio Nakano
  • Expert 8750 points

    In reply to F.N:

    Hao-san,

    Thank you for your cooperation.

    After I answered the question to the customer, the customer pointed out the description
    in the datasheet. The datasheet describes below.

     "The DS26LS32A differs in function from the popular DS26LS32 and DS26LS33 in that input
      pull-up and pull-down resistors are included which prevent output oscillation on unused channels."

    Which is correct? 
    If the datasheet is correct, please let me know the values of pull-up and pull-down resistors

    ・DS26LS32A datasheet :

    Best regards,
    Fumio Nakano

  • In reply to F.N:

    Fumio,

    The datasheet is right. The schematic I found is actually from DS26LS32. Sorry for my ignorance here. I'll find the pull up / pull down information for you.

    Regards,

    Hao

  • Expert 8750 points

    In reply to Hao L:

    Hao-san,

    Thank you for your reply.
    I will wait for your imformation.

    Best regards,
    Fumio Nakano

  • In reply to F.N:

    Fumio-san,

    Please find the schematics below. Please be noted that the + pin and - pin has different pull up and pull down strength. Please let me know if you have more questions.

    Regards,

    Hao

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