Thanks a lot, praondevou. But I'm sorry I still don't exactly understand it. Could you please help me a little more?You won't see an inverter symbol with a bubble on the input so much (as a single symbol). What you will see are more complex IC symbols where there is a bubble on the input. Usually "Active Low" means just that this input will normally be "High" and to fulfill it's function it will have to be asserted or pulled to "Low".
What do you mean by "reset"? Please let me know.
example: you see the bubble on pin 4? That means to reset the 555 you will need to pull this pin to LOW. If it's connected to Vcc it's just doing nothing.
Yes"HIGH" and "LOW" simply mean logic state "1" and "0" respectively.
So if you have for example ""Active Low" input circuit. To activate the circuit you need supply the input with the specified LOW state voltage 0V. Then the circuit in is activate.""Active Low" means just that this input will normally be "High"" :- See, here's the confusion. In my opinion, input will neither be HIGH nor LOW. We set it to be either HIGH or LOW by supplying it with the specified voltage which could either be 5V or 0V. For example, in the IC 74LS04 below, I would define it if input pin #3 is HIGH or LOW by supplying it with the specified voltage.
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