Product of Sums

• A boolean equation in the form: f = (or_term) (or_term)… (or_term) is called a Product of Sums (POS).

Y = (A+B) (C+D)

Implementing this logic in two levels of gating is easy.

Or-And form

A

B

C

D

7408

7432

7432

7402

7402

7402

A

B

C

D

Y

Y

Nor-Nor form drawn in mixed logic convention

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