1. Eng. Mohammed Timraz Electronics & Communication Engineer University of Palestine Faculty of Engineering and Urban planning Software Engineering Department Logic Gates Digital Logic Design Lab. ESGD2203 Lecture 1

2. Logic Gates OR Gate We can represent the OR gate as a light in an electric circuit applied with two switches as appears in the following electric circuit. Switch From the upper circuit we find that if we connect at least one switch (A or B) the lamp will be ON. (Y) output

3. Logic Gates ABY (output) 000 (Off) 011 (ON) 10 11 The OR gate truth table OR Gate The OR Gate Symbol:

4. Logic Gates OR Gate The OR gate as Integrated Circuit (IC) 74LS32 General Description: This device contains four independent gates each of which performs the logic OR function.

5. Logic Gates Connection Diagram: OR Gate The OR gate as Integrated Circuit (IC) 74LS32

6. Logic Gates AND Gate We can represent the AND gate as a light in an electric circuit applied with two switches as appears in the following electric circuit. From the upper circuit we find that we must to connect the two switches (A and B) to do the lamp ON, otherwise the lamp Off. Switch (Y) output

7. Logic Gates ABY (output) 000 (Off) 01 10 111 (ON) The AND gate truth table AND Gate The AND Gate Symbol:

8. Logic Gates AND Gate The AND gate as Integrated Circuit (IC) 74LS08 General Description: This device contains four independent gates each of which performs the logic AND function.

9. Logic Gates Connection Diagram: AND Gate The AND gate as Integrated Circuit (IC) 74LS08

10. Logic Gates AY (output) 01 (ON) 10 (Off) The INVERTER gate truth table INVERTER Gate The INVERTER Gate Symbol:

11. Logic Gates INVERTER Gate The INVERTER gate as Integrated Circuit (IC) 74LS04 General Description: This device contains six independent gates each of which performs the logic INVERT function.

12. Logic Gates Connection Diagram: INVERTER Gate The INVERTER gate as Integrated Circuit (IC) 74LS04

13. Logic Gates The NAND gate truth table NAND Gate The NAND Gate Symbol: ABY (output) 001 (ON) 01 10 110 (Off)

14. Logic Gates NAND Gate The NAND gate as Integrated Circuit (IC) 74LS00 General Description: This device contains four independent gates each of which performs the logic NAND function.

15. Logic Gates Connection Diagram: NAND Gate The NAND gate as Integrated Circuit (IC) 74LS00

16. Logic Gates ABY (output) 001 (ON) 010 (Off) 10 11 The NOR gate truth table NOR Gate The NOR Gate Symbol:

17. Logic Gates NOR Gate The NOR gate as Integrated Circuit (IC) 74LS02 General Description: This device contains four independent gates each of which performs the logic NOR function.

18. Logic Gates Connection Diagram: NOR Gate The NOR gate as Integrated Circuit (IC) 74LS02