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Translation from 1.5V logic to 5V ?

Discussion in 'Electronic Design' started by Spehro Pefhany, Jan 10, 2007.

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  1. Is there a single-chip solution for 6 channels of up translation from
    1.5V CMOS to 5V CMOS/TTL levels (other than using 1-1/2 LM393s and a
    half-dozen pullup resistors? Speed is not an issue; a few useconds
    woudl be fine.

    The apparently single-chip solutions seem to crap out at 3.x volts for
    the higher Vdd/Vcc.

    Best regards,
    Spehro Pefhany
  2. Jim Thompson

    Jim Thompson Guest

    Spehro, Have you tried a 3.3V to 5V translator? One with dual VDD's.

    I'd expect that it would work *slowly* for 1.5V to 5V. As long as the
    lower VDD is at least 2*VT you can get away with it.

    ...Jim Thompson
  3. Tam/WB2TT

    Tam/WB2TT Guest

    You could use 6 discrete bipolar transistors, or a transistor array with
    4.7K pullups from collector to +5, and a 4.7K resistor in series with each
    base. I would use SIPs for the resistors.

  4. These are cool parts, I might be able to find a way to use them by
    adding a supply rail etc.

    The bus isolation feature is particularly handy.

    Best regards,
    Spehro Pefhany
  5. Nice chip and price, thanks. Sort of a pass-through with voltage limit

    Best regards,
    Spehro Pefhany
  6. Jim Thompson

    Jim Thompson Guest

    Yep. We've gone full circle, from a single gate on a chip, to
    millions of devices, back to a few gates.

    Only difference is that now the devices are so small that the chip
    size is dictated by how much space it takes to get the bonding pads to
    fit ;-)

    ...Jim Thompson
  7. Yuriy K.

    Yuriy K. Guest

    Philips 74ALVC164245 at least mention possibility of 1.5 -> 5 V
    translation, though does not guarantee any timing characteristics.
  8. What qty?
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