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The Digital Logic Level (3)

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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The Digital Logic Level (3)

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  1. TK6123 : Lecture 16 The Digital Logic Level (3) Ass. Prof. Dr. Masri Ayob

  2. Comparators • 1-Bit Comparator • 2-Bit Comparator • 4-Bit Comparator

  3. Comparators • 1-Bit Comparator The output is 1 when the inputs are equal

  4. Comparators • 2-Bit Comparator The output is 1 when A0 = B0 AND A1 = B1

  5. 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)

  6. Decoders • Binary decoder • 4-bit decoder • BCD-to-decimal decoder

  7. 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

  8. LogicDiagram Decoders • 4-bit decoder

  9. TruthTable Decoders • 4-bit decoder • Binary inputs • Active-low outputs

  10. Decoders: BCD-to-decimal decoder

  11. Thank youQ&A

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