Problem getting Shift Register in Eagle?

Community PCB Design
1

Hi,

Here is how it looks in the datasheet:

http://clip2net.com/clip/m12122/1248030 … p-19kb.png

And this is what I found the most near in Eagle:

http://clip2net.com/clip/m12122/1248030 … p-13kb.png

How can I have the one in the datasheet (M74HC595) ?

2

It has the pins arranged more conveniently, as is usually done with PCB parts, and the supply and ground pins are declared implicitly, to avoid clutter. What is the problem?

Leon

3

Compare the pin outs of the 74LS595 and 74HC595 - you will find that they are the same. As Leon pointed out, the symbol is drawn for convenience to make the schematic clearer. If you look at the package, it has the correct pinout.

I’ve used the SO16 version and it is correct.

Note, you will need to do an “invoke” on the part the get Vcc and Gnd pins.

Basically, there is no problem.

4

I thought this would produce a problem because when it will be the time to procude the PCB the pins won’t be in the good place (sorry I am very new to this I might not understand…).

5

that is true (you don’t understand). The symbol is used in the schematic, the package is used in the PCB. Usually, a library entry has both. place the the device in a schematic and then switch to board view to see what get’s put on the PCB.

I suggest you go through a tutorial before anything else.

6

Thank to be that much direct Philba. I have of course follow multiple tutorials before posting here and of course, all tutorials work fine with easy steps and all components are directly available in the Eagle program with all pins in the right place but this is not my case. If the SCLR is at the right in the component and it’s in the left in the eagle schematic, I believe I have a problem.

I will try to get more information somewhere else because I really do not understand details that I receive form the moment by your explication otherwise that I do not understand and that I should go somewhere else then here to figure it out. Thanks and I hope I haven’t waste too much of your precious time…

7

leon_heller:
It has the pins arranged more conveniently, as is usually done with PCB parts, and the supply and ground pins are declared implicitly, to avoid clutter. What is the problem?

Leon

The problem is that I have pins in an other place in real, I understand that the software place them in a more conveniently but how would I be able to fix the component in place if the pin are not right in the same place?

8

As we keep saying, the PCB will be correct (assuming that the Eagle part was created correctly in the first place). You can always edit the part to get it in your preferred form, of course.

Leon

9

Yep, when creating your schematic, the placement of the symbol’s pins doesn’t represent the placement of the pins in the board editor.

10

FartingMonkey92:
Yep, when creating your schematic, the placement of the symbol’s pins doesn’t represent the placement of the pins in the board editor.

oh I see!

leon_heller:
the PCB will be correct (assuming that the Eagle part was created correctly in the first place). You can always edit the part to get it in your preferred form, of course.

I will investigate more about it. Thank you.

I understand more now.