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Low Power Logic Circuit

Discussion in 'Misc Electronics' started by Paul, Oct 7, 2003.

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  1. Paul

    Paul Guest

    Hi Folks

    I am trying design a NOT gate and two OR functions (Z= /A + B + C) but
    the only problem is the current consumption and the VCC. The current
    allowed for the logic is 5uA and the VCC is approx. 5V. I have tried
    looking for low powered ICs from Philips and Fairchild but the only
    problem is the maximum VCC is 3.3V and also it does not meet the
    current consumption. Is there a way of designing the logic using
    discretes without increasing the impedance of the circuit.
    I have used a transistor and two diodes but the resistor at the
    collector suggested by a colleague will have to be large to reduce the
    current consumption.

    Any help will be great.


  2. Jim Thompson

    Jim Thompson Guest

    Are you living in a cave? ANY CMOS device will meet the power
    consumption easily. Their static consumption is zilch... just

    ...Jim Thompson
  3. John Fields

    John Fields Guest

    Are you living in a cave?^)

    Here's a single chip solution: U1 is an HC27 triple 3-input NOR and

    A,B, and C are the inputs and Y is the output of each gate.

    _ +---A U1B U1C
    A>-------+---B Y--------A +---A _
    +---C +----B Y----+---B Y--->/A+B+C
    | +--C +---C
    B>------------------+ |

    U1A-Y = A
    U1B-Y = ABC
    U1C-Y = A+B+C
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