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# Lecture on combinational and sequential circuits

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### Lecture on combinational and sequential circuits

1. 1. LECTURE ON COMBINATIONAL ANDSEQUENTIAL CIRCUITS BY, DEEPIKA GOTTIPATI
2. 2. COMBINATIONAL CIRCUITS Output is dependent only on input Doesn’t contain memory element Value of present output is determined by present input Examples of combinational circuits are half adders, full adders, subtractors etc
3. 3. SEQUENTIAL CIRCUITS Outputs depend on present inputs and previous inputs also It contains memory elements for storing previous state inputs Examples of sequential circuits are flip flops, counters, shift registers
4. 4. GATES AND NAND OR NOR NOT EX-OR EX-NOR
5. 5. UNIVERSAL GATES The basic building blocks of any design are UNIVERSAL GATES NAND and NOR are the universal gates
6. 6. FUNCTIONALITY OF NAND GATE The NAND function is a combination of the two separate logical functions, the AND function and the NOT function connected together in series. The logic NAND function can be expressed by the Boolean expression of, A.B The Logic NAND Function only produces the output when any of its inputs are FALSE.
7. 7. NAND GATE2 INPUT NAND GATE TRUTH TABLE
8. 8. FUNCTIONALITY OF NOR GATE The NOR Gate is also a combination of two separate functions, the OR function and the NOT function connected together in series The logical NOR function is expressed by the Boolean expression as, A + B The Logic NAND Function only produces the output when all of its inputs are FALSE
9. 9. NOR GATE2 INPUT NOR GATE TRUTH TABLE
10. 10. HOW TO DESIGN A COMBINATIONAL CIRCUIT Half adder truth table K-Maps Circuit using gates
11. 11. HOW TO DESIGN A SEQUENTIAL CIRCUIT [FLIP FLOPS] SR Flip flop JK Flip flop D Flip flop T Flip flop