Changing Pin Assignments in a Package

Oops, I linked to the wrong data sheet for the part that I have (the actual, physical chip): I see that the Eagle library is correct, but I think my chip has different pin assignments than the one in the library. I'll follow Warren's suggestion and make a new part. Sorry for the confusion on my end.

Thanks,

David

Am 02.06.2016 um 12:09 schrieb David Schwab:

I'm using the 14-pin, DIP Quad NAND gate (74ALS00N) from part 74*00 in library 74xx-us in a schematic. The problem I'm having is that the pin assignments don't match the datasheet: for example, the package has the 2nd gate's IN1, IN2, and OUT pins assigned to pins 4,5, and 6, while the datasheet has them assigned to 5, 6, and 4. Here's the datasheet, so you can see what I mean: DM74ALS00A pdf, DM74ALS00A description, DM74ALS00A datasheets, DM74ALS00A view ::: ALLDATASHEET ::: (http://pdf1.alldatasheet.com/datasheet-pdf/view/50914/FAIRCHILD/DM74ALS00A.html) I've actually never seen a chip with the pins assigned the way they are in this part: I'm pretty sure the assignments in the datasheet are based on the original Texas Instruments design from the 1970s, which is the de facto standard for this chip.

 

How can I fix the pin assignments to match the datasheet? I tried editing the part, and changing the pin mappings between the symbol and the package using the CONNECT button, but when I added the part to a new schematic, nothing was changed.

 

Thanks,

 

David

 

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Nothing wrong with the eagle library.

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Mit freundlichen Grüßen / With best regards

Joern Paschedag

... while the datasheet has them assigned to 5, 6, and 4.

What? Where do you see this? To me it seems perfect match between Eagle and datasheet.

On 2/06/2016 10:09 p.m., David Schwab wrote:

I'm using the 14-pin, DIP Quad NAND gate (74ALS00N) from part 74*00 in library 74xx-us in a schematic. The problem I'm having is that the pin assignments don't match the datasheet: for example, the package has the 2nd gate's IN1, IN2, and OUT pins assigned to pins 4,5, and 6, while the datasheet has them assigned to 5, 6, and 4. Here's the datasheet, so you can see what I mean: DM74ALS00A pdf, DM74ALS00A description, DM74ALS00A datasheets, DM74ALS00A view ::: ALLDATASHEET ::: (http://pdf1.alldatasheet.com/datasheet-pdf/view/50914/FAIRCHILD/DM74ALS00A.html) I've actually never seen a chip with the pins assigned the way they are in this part: I'm pretty sure the assignments in the datasheet are based on the original Texas Instruments design from the 1970s, which is the de facto standard for this chip.

 

How can I fix the pin assignments to match the datasheet? I tried editing the part, and changing the pin mappings between the symbol and the package using the CONNECT button, but when I added the part to a new schematic, nothing was changed.

 

Thanks,

 

David

 

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To view any images and attachments in this post, visit:

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Hi

Woops! - wrong forum. This forum is for making suggestions for changes

to the EagleCad software.

As for your issue. I suspect, if you did perform a save, then you are

getting the same named part from another instance of the eagle

libraries. Possibly from a previous install.

Place something in the device you are modifying so you can sure you are

adding from the library you have modified.

Check your Options>Directories...>Libraries to verify you don't have

more than one path to similarly named libraries.

The eagle.epf file that every project has containes used libraries so

that may be pointing you to another similarly named library.

Un-Use all the libraries.

Use - the desired libraries again.

HTH

Warren