avr What is the point of Buffers like this in Programmers

Posted on Feb 5, 2014

On the bottom you will see a 74AC125 which is a Quad Buffer with Tri-State Outputs. I`ve seen quite a few buffers like this on programmers. but im not exactly sure what they do Im assuming whatever `CTL` is controls the `state` of the buffers. but what exactly is the point Why can`t you wire it directly to whatever Port Line (Serial or w/e). Or does this have something to do with Impedance

avr What is the point of Buffers like this in Programmers
Click here to download the full size of the above Circuit.

(Which Im not sure I STILL quite understand). Is it because the Signals are coming out of the ATTINY2313 (or w/e MC is used) too fast and they need to be slowed down I see this often when using a USB port of Serial Line. that one of these "Buffers" is used. What would happen if it wasn`t there

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