8x1 multiplexer has 8 data input lines I₀, I₁, I₂, I₃, I₄, I₅, I₆, I₇, 3 select lines S₀, S₁, S₂ and one output, Y.

Truth Table for 8x1 Multiplexer

Data Select Input

Output

Y

S₂

S₁

S₀

0

0

0

I₀

0

0

1

I₁

0

1

0

I₂

0

1

1

I₃

1

0

0

I₄

1

0

1

I₅

1

1

0

I₆

1

1

1

I₇