How to utilize Cd4078 Please Help me

Discussion in 'Homework Help' started by markie, Jul 5, 2014.

  1. markie

    Thread Starter New Member

    Jul 5, 2014
    1
    0
    Hi guys.
    Please help me in how to construct a 16 to 4 line encoder usind CD4078
    I dont know in what pin should be connected to ground
    I am confused on Vdd and Vss
    Thanks
     
    Last edited: Jul 5, 2014
  2. MrChips

    Moderator

    Oct 2, 2009
    12,446
    3,362
    CD4078 is an 8-input NOR/OR gate.
    I don't know how you would construct a 16 to 4-line encoder with just this gate.

    Vss is the source connection, i.e. the source of electrons. Hence the Vss pin would be connected to the negative potential of the battery or the GROUND while Vdd would be connected to the positive potential of the battery or supply voltage, usually between +3 and +18V.
     
  3. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,503
    380
    hi,
    A CD4078 is an 8 Input OR/NOR Gate.

    Vdd is the positive supply and Vss is 0V.

    Do you have the datasheet.?

    E
     
  4. MrCarlos

    Active Member

    Jan 2, 2010
    400
    134
    Hello markie

    Now you only need to build the encoder 16 to 4-line with CD4078 gates.
    Surely you've analyzed Their datasheets.
    So now you know that these gates have 2 outputs. therefore called NOR/OR.

    We will assume that the encoder is 16 to 4 BITs natural binary:
    To make the encoder, 4 CD5078 gates are required.
    Taking the 4 outputs of the OR gates.
    We can name them as Q1, Q2, Q4, Q8.
    And the inputs to the encoder:
    1, 2, 3,. . . . 13, 14, 15.
    The symbol of this encoder would look like the one shown in the attached image.

    The formula for Q1 would be:
    Q1=1 + 3 + 5 + 7 + 9 + 11 + 13 + 15.
    And for Q2 would be:
    Q2=2 + 3 + 6 + 7 + 10 + 11 + 14 + 15.
    (+ Means OR)

    What could be the formula for Q4 and Q8 ??
     
    Last edited: Jul 8, 2014
    absf likes this.
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