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TK6123 : Lecture 16. The Digital Logic Level (3). Ass. Prof. Dr. Masri Ayob. Comparators. 1-Bit Comparator 2-Bit Comparator 4-Bit Comparator. Comparators. 1-Bit Comparator. The output is 1 when the inputs are equal. Comparators. 2-Bit Comparator.

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comparators
Comparators
  • 1-Bit Comparator
  • 2-Bit Comparator
  • 4-Bit Comparator
comparators1
Comparators
  • 1-Bit Comparator

The output is 1 when the inputs are equal

comparators2
Comparators
  • 2-Bit Comparator

The output is 1 when A0 = B0 AND A1 = B1

comparators3
Comparators
  • 4-Bit Comparator

One of three outputs will be HIGH:

      • A greater than B (A > B)
      • A equal to B (A = B)
      • A less than B (A < B)
decoders
Decoders
  • Binary decoder
  • 4-bit decoder
  • BCD-to-decimal decoder
decoders1
Decoders
  • Binary decoder

The output is 1 only when:

A0 = 1

A2 = 0

A3 = 0

A4 = 1

This is only one of an infinite number of examples

decoders3

TruthTable

Decoders
  • 4-bit decoder
    • Binary inputs
    • Active-low outputs
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