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low output impedance MUX

Discussion in 'Electronic Design' started by mook johnson, Apr 10, 2004.

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  1. mook johnson

    mook johnson Guest

    I have a requirement to drive 32, 5 volt devices, with a 10mA current draw
    each. I'd like to power each one on, one at a time, and cycle through
    several times per second.

    Does anyone know of a 1:8 or 1:16 mux (or device with similar functionality)
    that has an output impedance lower than 10 ohms?
  2. Rich Grise

    Rich Grise Guest

    It's usually not expressed as an impedance, but the spec sheet calls out:

    Vol: Maximum LOW Level Output VOltage, at Vcc= 4.5V, max .44V at Iol = 24

    That's for a low side driver - high side is only guaranteed to give you
    at -24 mA.

    There are lots of others, that's just the first one I looked at. You'd need
    4 chips, and of course, the counter.

    Have Fun!
  3. GPG

    GPG Guest

    Since '138 is active low inversion is required to switch high side.
    Could buffer with
    50 mV VCEsat
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