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Design Example “ Date of Birth Problem”

Design Example “ Date of Birth Problem”. a b c d e f g. Date of Birth 7-Segment Display Driver Logic Circuit. X Y Z. Combinational Logic Application.

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Design Example “ Date of Birth Problem”

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  1. Design Example“Date of Birth Problem”

  2. a b c d e f g Date of Birth 7-Segment Display Driver Logic Circuit X Y Z Combinational Logic Application Design a combinational logic circuit that has three inputs and seven outputs. As the inputs count from 000 to 111, the seven outputs will generate the required logic to display your date of birth on a seven segment display.

  3. X Y Z 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 X 1 1 0 X 1 1 1 Circuit Inputs Display Example: If your date of birth is July 23, 1961, the circuit will display the output shown to the right 07 23 61. The last two outputs are don’t cares.

  4. +5 V Segment Is ON ! Segment Is OFF ! 0 1 Logic For Segment A Common Anode LED Display 270 - 330

  5. X Y Z a b c d e f g 0 0 0 0 0 0 0 0 0 1 a a a a a a 0 0 0 1 1 1 1 0 0 1 0 0 1 0 0 1 0 0 1 0 b b b b b b f f f f f f 0 0 0 0 1 1 0 0 1 1 g g g g g g 1 0 0 0 1 0 0 0 0 0 1 0 0 1 1 1 1 1 0 1 c c c c c c e e e e e e X 1 1 0 d d d d d d X 1 1 1 Display 0 0 0 0 0 0 1 0 0 0 1 1 1 1 0 0 1 0 0 1 0 0 0 0 0 1 1 0 0 1 0 0 0 0 0 1 0 0 1 1 1 1 x x x x x x x x x x x x x x

  6. X Y Z a b c d e f g 0 0 0 0 0 0 0 0 0 1 X X 0 0 0 1 1 1 1 0 0 1 0 0 Y Z 0 0 1 0 0 1 0 0 1 0 0 1 Y Z 0 0 0 0 1 1 0 0 1 1 X Z Y Z 0 x 1 0 0 0 1 0 0 0 0 0 0 Y Z x 1 0 0 1 1 1 1 1 0 1 X x x x x x x x 1 1 0 X x x x x x x x 1 1 1 Display Logic For Segment “a” a = X Z

  7. b = X Z c = Y Z d = Y Z g = X Y + Y Z Boolean Equations for 7 Segments a = X Z e = Z f = Y + Z

  8. 7408 AND Gates 7404 Inverters 7432 OR Gates 7408 DOB 7-Segment Display Driver Circuit

  9. 7-Segment LED Display

  10. Assignment • Design a Date-of-Birth 7-Segment Display Driver Circuit for your birth date. Include the truth table, K-Maps & logic design. • Simulate your design using circuit design software. • Breadboard and test your design.

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