1. Date of Birth Design Problem
Digital Electronics
2.3 Date of Birth Design Problem
Date of Birth Design Problem
Digital Electronics
Project Lead The Way, Inc.
Copyright 2009

2. Design Specifications
Date of Birth Design Problem
Digital Electronics
2.3 Date of Birth Design Problem
Design Specifications
Design a combinational logic circuit that meets the following design specifications:
There are three (3) three inputs and seven (7) outputs.
As the inputs count from 000 to 111, the outputs (a – g) will generate the logic to display a date of birth (DOB) on a 7-segment display.
The 7-segment display is a common cathode display.
The DOB will be displayed in the MM-DD-YY format.
Date of Birth
7-Segment Display
Driver Logic Circuit a b c d e f g X Y Z
Project Lead The Way, Inc.
Copyright 2009

3. Date of Birth Design Problem
Digital Electronics
2.3 Date of Birth Design Problem
Example – DOB 02/13/10 X Y Z
Display 1
February 13, 1910 ( ) is the date of birth of William Shockley. Shockley, along with John Bardeen and Walter Brattain, invented the transistor while working at Bell Labs in the 1940s.
Project Lead The Way, Inc.
Copyright 2009

4. Date of Birth Design Problem
Digital Electronics
2.3 Date of Birth Design Problem
DOB Truth Table X Y Z
Display a b c d e f g 1
Project Lead The Way, Inc.
Copyright 2009

5. Date of Birth Design Problem
Digital Electronics
2.3 Date of Birth Design Problem
K-Map for Segment (a) X Y Z
Display a 1 1
Project Lead The Way, Inc.
Copyright 2009

6. Date of Birth Design Problem
Digital Electronics
2.3 Date of Birth Design Problem
Segment (a) – AOI Logic
X Y Z a
Project Lead The Way, Inc.
Copyright 2009

7. Date of Birth Design Problem
Digital Electronics
2.3 Date of Birth Design Problem
K-Map for Segment (b) X Y Z
Display b 1 1
Project Lead The Way, Inc.
Copyright 2009

8. Segment (b) – NAND Logic
Date of Birth Design Problem
Digital Electronics
2.3 Date of Birth Design Problem
Segment (b) – NAND Logic
X Y Z b
Project Lead The Way, Inc.
Copyright 2009

9. Date of Birth Design Problem
Digital Electronics
2.3 Date of Birth Design Problem
K-Map for Segment (c) X Y Z
Display c 1 1
Project Lead The Way, Inc.
Copyright 2009

10. Date of Birth Design Problem
Digital Electronics
2.3 Date of Birth Design Problem
Segment (c) – NOR Logic
X Y Z c
Project Lead The Way, Inc.
Copyright 2009

11. Date of Birth Design Problem
Digital Electronics
2.3 Date of Birth Design Problem
All Segments
Project Lead The Way, Inc.
Copyright 2009

12. Date of Birth Design Problem
Digital Electronics
2.3 Date of Birth Design Problem
X Y Z
Complete Date of Birth Circuit
Common Cathode
7-Segment Display
AOI
Segment a & d
NAND
Segment b
NOR
Segment c
AOI
Segment e
NAND
Segment f
NOR
Segment g
Project Lead The Way, Inc.
Copyright 2009