The document discusses common cathode 7-segment displays, including their structure as light-emitting diodes. It provides information on the truth table and Karnaugh maps for specific pins (a, c, d) but notes challenges in drawing logical circuits for some of the pins. The logical functions for the pins are also mentioned, with an example for pin d given.

1. NIBRAS, SHAMIT
ID:19-40117-1
COURSE: DIGITAL LOGIC AND CIRCUITS
SECTION: E
DEPARTMENT: COMPUTER SCIENCE AND ENGINEERING
AMERICAN INTERNATIONAL UNIVERSITY-BANGLADESH

2. DecoderForACommonCathode7-segment
Display(7DAB9)

4. What is common cathode 7 segment display
▪ An LED or Light Emitting Diode, is a solid
state optical p n-junction diode which emits
light energy in the form of photons.

5. Truth Table

7. K-MAP FOR PIN A

8. K-MAP FOR PIN C

9. K-MAP FOR PIN D

10. Logical Circuit For The Function Of The Pin A
y = 1

11. We can’t Easily Draw Logical Circuit For The
Function Of The Pin A, Because group equation is
Y=1

12. Logical Circuit For The Function Of The Pin C
y = 1

13. We can’t Easily Draw Logical Circuit For The
Function Of The Pin C, Because group equation is
Y=1

14. Logical Circuit For The Function Of The Pin D
y = C + A

15. C
A
Y