1. 1 Forging new generations of engineers

2. 2 DESIGN EXAMPLE “Date of Birth Problem”

3. 3 Combinational Logic Application Date of Birth 7-Segment Display Driver Logic Circuit abcdefgabcdefg XYZXYZ 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.

4. 4 X Y Z 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 - - Example: If your date of birth is July 23, 1961, the circuit will display the output shown to the right 07 23 61. There are dashes between numbers. Circuit Inputs Display

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

6. X Y Z 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 a b c d e f g a g f b d e c 0 0 0 0 0 0 1 a g f b d e c a g f b d e c 0 0 0 1 1 1 1 1 0 0 1 1 1 1 a g f b d e c 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 Display - - 1 1 1 1 1 1 0

7. X Y Z Logic For Segment “a” 0 0 0 1 0 1 1 0 a = XZ+X’YZ’ X Z X Y Z 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 a b c d e f g 1 0 0 1 1 1 1 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 Display - - 1 1 1 1 1 1 0 X’YZ’

8. 8 Create Boolean Equations for all 7 Segments a = XZ+X’YZ’ e = f = c = b = d = g =

9. 9 DOB 7-Segment Display Driver Circuit 7404 Inverters 7432 OR Gates 7408 AND Gates 7408

10. 10 7-Segment LED Display

11. 11 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.