The digital logic level 3
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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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The Digital Logic Level (3)

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The digital logic level 3

TK6123 : Lecture 16

The Digital Logic Level (3)

Ass. Prof. Dr. Masri Ayob


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


Decoders2

LogicDiagram

Decoders

  • 4-bit decoder


Decoders3

TruthTable

Decoders

  • 4-bit decoder

    • Binary inputs

    • Active-low outputs


Decoders bcd to decimal decoder

Decoders: BCD-to-decimal decoder


Thank you q a

Thank youQ&A


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