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Sequential logics
1. SEQUENTIAL LOGICS
A form of binary circuit design.
Employs one or more inputs and one or more
outputs.
States are related by defined rules that depend, in
part, on previous states.
Each of the input(s) and output(s) can attain either
of two states: logic 0 (low) or logic 1 (high).
EXAMPLE: A common example is flip-flop.
2. FLIP-FLOP
A device that can store 1 bit of information.
It is a clocked device, which can change its value
only at positive clock edges.
When the clock is not at a positive edge, the flip-
flop maintains (holds) its value.
3. Q
Q’
Inputs
Normal Output
Inverted Output
They have two stable sates and can be switched from
one to the other by appropriate inputs.
These stable conditions are usually called the states
of the circuit.
4. TYPES OF FLIP-FLOPS
There are four types of flip-flops.
Basic RS flip-flop
Clocked RS flip-flop
JK flip-flop
D flip-flop
T flip-flop
Master slave flip-flop
5. D FLIP-FLOP
Also known as data flip-flop.
Can be constructed from RS flip-flop by adding an
inverter.
Inverter is added so that the R input is always the inverse
of S(or J input is always complementary of K).
7. D Q Q (New) Operations
0 0 0 Reset
0 1 0 Reset
1 0 1 Set
1 1 1 Set
TRUTH TABLE
8. T FLIP-FLOP
Also known as toggle flip-flop.
It has only the toggle and hold operation.
If toggle mode operation. The output will toggle from 1 to
0 or vice versa.