512-861-3400Log inCreate Account

Open drain buffer output pull-up on warm reset circuit?

Forums › Reference, Evaluation, and Development Boards › Open drain buffer output pull-up on warm reset circuit?

Viewing 2 reply threads
  • Author
    Posts
    • May 9, 2018 at 11:46 am #5314
      Dave Mcospan
      Participant

        Hi,

        I love the OSD3358-512M-BSM, I’m planning on making a small board with it. I’ve been going through your site’s very useful design tutorial. Currently, I’m working on the reset circuit, specifically the warm reset. I’ve used this page as a reference:

        OSD335x Reset Circuitry

        There is something that I’m not clear about. The output if the SN74LVC1G07  is attached to the APX811’s MR# pin. I don’t see a pull up for the output of the open drain buffer. It doesn’t look like it’s being pulled up anywhere. I looked through both of the datasheets for the parts and I don’t see any declared internal current pullup. Perhaps I missed it. I’d like to know if I’ve missed something.

        I’m planning on adding a 10K pull up to SYS_VDD1_3P3.

         

        Thanks again for the part and the documentation.

         

        Dave

      • May 9, 2018 at 5:44 pm #5317
        Neeraj Dantu
        Moderator

          Dave,

          The reset supervisor APX811 is a clone of MAX811 which has an internal pull-up resistance of 10K. We have measured the presence of this internal pull up on APX811. The datasheet of APX811 just doesn’t specify the pull-up but it is present.

          Hope that helps,

          Neeraj

        • May 9, 2018 at 7:28 pm #5318
          Dave Mcospan
          Participant

            Makes sense, thanks for the clarification!

        • Author
          Posts
        Viewing 2 reply threads
        • You must be logged in to reply to this topic.

        Octavo Systems LLC all rights reserved
        OCTAVO is registered in the U.S. Patent and Trademark Office. OSD, C-SiP, and the Octavo Logo are trademarks of Octavo Systems LLC.