Comparators

• A comparator will evaluate two binary strings and output a 1 if the two strings are exactly the same.
• The Exclusive-NOR (Equality gate) is used to perform the comparison.
• One Exclusive-NOR is used per pair of Binary bits and the outputs of all Exclusive-NORS are ANDed together.

• The 7485 is a 4-bit magnitude comparator.
  A magnitude comparator will determine if A = B, A > B or A < B.

• Expansion inputs are provided on the 7483 so that word sizes larger then 4-bits may be compared.

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Date last modified: January 17, 2013.