LOGIC GATES JUST BASIC ONLY AT YOUR .pptx

ABOUT THE DISCUSSION ON LOGIVC GATES BASIC

1. BOOLEAN EXPRESSIONS The OR operation “+” written A+B The AND operation “ * ” written A*B or AB The complement called NOT or inverse

2. TRUTH TABLES Operations are defined in terms of truth tables Each element assigned a truth value of 1(“true”) or 0 (“false”) Four possible combinations of truth values for two elements

3. SERIES SWITCHING CIRCUITS A series circuit Two or more switches Current will flow only if all switches are closed Same truth table as the BOOLEAN operation AND

4. PARALLEL SWITCHING CIRCUITS A parallel circuit Two or more switches Current will flow either switch is closed Same truth table as the Boolean operator OR

5. Why use logic gates? Control the transmission of input pulses The building blocks of electronic circuits

6. AND GATE

7. OR GATE

8. Not GATE

9. NAND GATE

10. NOR GATE

11. XOR GATE

12. LOGIC CIRCUIT A logic circuit contains one or more basic logic gates Logic circuits have the properties of Boolean algebra An AND-OR logic circuit called SUM of PRODUCTS

13. COMBINATIONAL LOGIC GATES