Difference between Combinational and Sequential logic circuits.

DIFFERENCE BETWEEN COMBINATIONAL & 

SEQUENTIAL LOGIC CIRCUITS :

COMBINATIONAL CIRCUITS :

• In combinational circuits , output depends only & immediately on their inputs . They have no memory i-e independent of past values of their inputs. 

• Combinational circuits are faster & easy to design .
• Mostly used for Arithmetic & Boolean operation.
• Logic Gates are the building block of Combinational Circuits.
• Independent of Clock Pulses & does not require triggering to operate.
•  The present value of it's outputs are determined by the present value of it's inputs. 
• Combinational Circuits has no memory units.
• Parallel Adder is a Combinational Circuit.

• Examples of Combinational Circuits :

1. Half & Full Adder 
2. Half  & Full Subtractor
3. MUX & DEMUX

SEQUENTIAL CIRCUITS :

• Sequential circuits, act as storage elements and have memory. They can store, retain, and then retrieve information when needed . Our treatment will distinguish sequential logic from combinational logic. 
  
• Sequential circuits are slower & difficult to design. 
• Sequential Circuits has memory units to store past outputs.
• Sequential circuits are used for storing data (hence used in RAM) 
• Latches or Flip Flop (Binary Storage Devices) are the building block of Sequential Circuits.
• Dependent of Clock Pulses & requires triggering to operate.
•  The present value of it's outputs are determined by the present value of it's inputs & it's past state .
• Serial Adder is a Sequential Circuit.

• Examples of Sequential Circuits :

1.  Flip Flop
2. Shift Registers 
3. Binary Counters