2. Which of the following is the correct output expression for an eight to one MUX?

  1. Y = D(m0 + m1 + m2 +...+ m7)
  2. Y = (D0*m0 + D1*m1 + D2*m2 +...+ D7*m7)*E
  3. Y = m0' + m1' + m2' +...+ m7'
  4. Y = (D0*m0' + D1*m1' + D2*m2' +...+ D7*m7')*E
  5. Y = D*m0 + D*m1 + D*m2 +...+ D*m7

2 is CORRECT. This is the multiplexer equation, where Y is the output and the Di are the eight data inputs. The minterms mi are generated from three input select lines C,B,A (not shown). The enable E must be high for the MUX to work.

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