Papabravo,

You are assuming that the circuit uses CMOS tech, why not use TTL or NMOS, that way you are not shorting the power lines together

PS, I know NMOS and TTL are ancient but who knows, maybe like me this person lives in the past :O

 

Even with CMOS it is common practice, particularly in IC design. But you do have to keep in mind that, in an IC, you have a lot more control over the environment seen by the different circuits and can also use different types of inverters for different things. As with many other things, there are games that you can play in an IC that you need to be more careful about when designing a non-IC circuit and the reverse is true, as well, there are common techniques in the discrete world that don't work out well on an IC. Overdriving an output to change the state of a latch is a standard tool in IC design and, while it is certainly viable and far from unheard of in the discrete world, it is also far less commonly encountered, if for no other reason that you have to be careful to use properly matched drive strengths so that you have a stronger signal overdriving a weak one. That's trivial on an IC, but much harder to do in a circuit using standard gates. About the only way to do it easily is with an actual switch to a supply; anything else and you have to do at least a bit of careful thinking.