1. Lecture

3. Outline Bits Gates Combinatorial Logic Spice Hands-On Stuff

4. Definition “Digital” comes from the Latin word for “fingers” and indicates that there are many discrete signals that are at one of two values.

5. Logic Gates NOT AND NAND OR NOR XOR XNOR

6. Logic Inverter NOT = “!” OUT=!A

7. A fictional AND Circuit The light bulb only turns on when both A and B are closed.

8. Truth Table AND = “&” OUT=A & B

9. NAND OUT=!(A&B)

10. A fictional OR Gate The light bulb turns on when either A or B is closed

11. An OR GATE OR = “+” OUT=A+B

12. A NOR Gate = OUT=!(A+B )

13. XOR Gate XOR=Exclusive OR – XOR returns a True output if only one of its input is true XOR=A ^ B

14. XNOR

15. Combinatorial Circuits

16. Logic Expresions 1=A&B 2=!(A+C) 3=!2 4=1&3 5=B&2 Output=4 ^ 5

17. Multisim Example

18. CMOS VS. TTL CMOS TTL

19. Various Logic Gates

20. Exercise Setup: – Pin 1: 4.8 V – Pin 2: 1.3 V-5 V – Pin 14: 4.8 V – Pin 7: GND Problem: – Pin 3: 0.18 V (?)

21. NAND Characterization