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555 Timer Madness
Blog Can a 555 Timer Serve as a Level Translator? Let's Find Out!
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  • Author Author: scottiebabe
  • Date Created: 29 Sep 2022 12:09 AM Date Created
  • Views 65392 views
  • Likes 17 likes
  • Comments 16 comments
  • level translator
  • 555timermadnessch
  • 555 timers
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Can a 555 Timer Serve as a Level Translator? Let's Find Out!

scottiebabe
scottiebabe
29 Sep 2022

Soft 404

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Top Comments

  • jc2048
    jc2048 over 2 years ago +1
    This is what a CMOS 555 (TLC555) manages, translating from 5V to 12V. The input (blue) is from an Arduino UNO, the output (yellow) is the unloaded output from the 555 with a 12V supply. For some reason…
  • scottiebabe
    scottiebabe over 2 years ago +1
    Deleted
  • jc2048
    jc2048 over 2 years ago in reply to scottiebabe

    This is with exactly the same test set-up, but with a KIA555P part in the socket (looking it up, it seems to be a Korea Electronics Corporation part). About 20ns of shoot-through for this part.

    image

    So, it looks like I was wrong and the sense resistor is doing fine.

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  • scottiebabe
    scottiebabe over 2 years ago in reply to jc2048
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  • jc2048
    jc2048 over 2 years ago in reply to scottiebabe

    This is with just the sense resistor and the other channel off, with its probe disconnected and the input set to the GND setting. It's more or less the same.

    image

    I'd doubt that the shoot-through current itself is actually bipolar. I suspect if the sense was better, with a much lower voltage drop, so that it was affecting the chip much less, and far less inductance hanging around, and the probing was better, it would disappear (but I can't really explain it, as it stands, other than that it feels to me like I'm looking at the lead inductances doing their thing).

    Possibly, the breadboard may even help a little. With some impedance in the supply wires and a decoupling cap directly across the pins, it maybe helps isolate the supply system momentarily as the cap is doing the heavy work.

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  • jc2048
    jc2048 over 2 years ago in reply to scottiebabe

    That's a really good visual demonstration. Is that an automated test set-up?

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  • scottiebabe
    scottiebabe over 2 years ago
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