# What is an Active*low*Input*and edge* triggered input?

1. May 14, 2012

### mm391

What is an "Active*low*Input*and edge* triggered input?"

I have been reading up on Flip Flops but can't find anywhere that explains in simple terms what an Active low input and edge triggered input are. Can someone help me understand it please?

Thanks

2. May 14, 2012

### FOIWATER

Re: What is an "Active*low*Input*and edge* triggered input?"

Active low means it gives a "True" value when the output value is 0

Edge triggered means it is triggered on either a 1 or 0. Just a change triggers it, look at the square wave, any time an edge occurs, that is to say anytime the input state changes from 0 to 1, or 1 to 0, it is triggered.

3. May 14, 2012

### Bobbywhy

Re: What is an "Active*low*Input*and edge* triggered input?"

http://en.wikipedia.org/wiki/Flip-flop_(electronics [Broken])

Last edited by a moderator: May 6, 2017
4. May 14, 2012

### FOIWATER

Re: What is an "Active*low*Input*and edge* triggered input?"

Although, what I said may be confusing in terms of a flip flop, if its constructed using NOR gates two inputs and two outputs.

If it is active low, than in the truth table, what gives you a 1 and 0 output, the inputs are opposite than what the normal truth table would be. The non responsive inputs/toggle bits/ whatever remain the same though.