hi , i need to add propagation delay for IC in simulation the problem that simulation is ideal.
so please if someone know how to add propagation delay

 

Try not to leave any of the info pins of IC's open, for example on the drifting state except if it is referenced in the datasheet about inward draw up/pull down accessibility.
Utilize resistors of appropriate qualities, generally 10K for outside draw up or pull down.
Utilizing outer draw up or pull down is must, while utilizing manual switches as information sources.
Utilize resistors of reasonable qualities for LED loads. Try not to associate LEDs straightforwardly to the yields in any event, for reproduction reason, as it might prompt erroneous activity of the circuit because of moving of voltage levels.