Propogation delay :

• The output of a logic gate does not change its state instantaneously in response to the change in the state of its input.
• There is a time delay between these two events ,which is called as the propogation delay .

• Thus propogation delay is defined as time delay between the instant application of an input pulse and the instant of occurrence of the corresponding output pulse.

   

Fan Out :

• Fan out is defined as the maximum number of the inputs of the same IC family that a gate can drive without falling outside the specified voltage limits.

• Higher the fan out higher is the current supplying capacity of the gate.

   

Power Dissipation

• Power dissipation is the amount of power drawn by the IC due to the current flowing current through the IC as a result of the applied voltage.

   

Noise Margin .

• Noise immunity is defined as the ability of logic circuit to tolerate the noise without causing any unwanted changes in the output.

• A quantitative measure of noise immunity is called as noise margin.

   

Fan out

• Fan out is defined as the maximum number of the inputs of the same IC family that a gate can drive without falling outside the specified voltage limits.
• Higher the fan out higher is the current supplying capacity of the gate.