Rise time

Decay time

Binary level transition period

Propagation delay

OR gate

AND gate

NAND gate

both 1) OR gate and 2) NAND gate

Propagation delay is the time required for a gate to change its state

Noise immunity is the amount of noise which can be applied to the input of a gate without causing the gate to change state

Fan-in of a gate is always equal to fan-out of the same gate

Operating speed is the maximum frequency at which digital data can be applied to a gate

X NAND X

X NOR X

X NAND 1

X NOR 1

NOT

AND

OR

XOR