DELAY: The time taken by a ‘gate’ in propagating an input signal to the OUTPUT of the gate is called ‘propagation delay’. It is measured in Nanoseconds (10-9sec.).Fan-out: The number of units that can be connected to the output of a logic gate is called its ‘Fan-out’.Noise Margin: In a digital circuit, the Noise Margin is the amount by which the signal exceeds the threshold for a proper ‘0’ or ‘1’.This is schematically explained with the HELP of the FOLLOWING diagram:CMOS has the largest Noise Margin and ECL is having Poor Noise Margin.TTL outputs are typically restricted to narrower limits, between 0 V and 0.4 V for a “LOW” and between 2.4 V and Vcc for a “HIGH”, providing at least 0.4 V of noise immunity.Noise Margins for CMOS chips are usually much greater than those of TTL because the VOH(min) is closer to the power supply Voltage and VOL(max) is closer to 0.A comparison of the given logic families is as shown: TTLECLCMOSFan-In12-14> 10> 10Fan-Out102550Power Dissipation (MW)101750.001NoiseMargin0.5 V0.16 V (lowest)1.5 V (Highest)Propagation Delay10< 3 (lowest)15 (Highest)Noise ImmunityVery goodGoodexcellent