Where are the 74ALS parts?

Logyx wrote on Sat, 13 June 2015 04:08

I'm trying to find the following parts:

 

74ALS645D

74ALS08D

So go make them.  By time you look around for them, post a question here

about them, possibly find them somewhere, vet them, and maybe update them

to your conventions, you'd have finished making them exactly as you want

them.

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

On 13/06/15 09:08, Logyx wrote:

I'm trying to find the following parts:

 

74ALS645D

74ALS08D

 

They don't seem to be in the default libraries nor in any downloadable

libraries I've found.

 

Have you looked in 74xx-eu.lbr (in the standard distribution)? It

certainly has one of those.

74ALS645D is almost completely obsolete...you should use something else, or

at least investigate a source before you commit & order boards (for parts

that will never arrive).

the non-D part is in stock in a few flavors

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

On 13/06/2015 16:57, Rob Pearce wrote:

On 13/06/15 09:08, Logyx wrote:

I'm trying to find the following parts:

 

74ALS645D

74ALS08D

 

They don't seem to be in the default libraries nor in any downloadable

libraries I've found.

 

Have you looked in 74xx-eu.lbr (in the standard distribution)? It

certainly has one of those.

Yes, found the "08" there (not 74ALS645D though)!

Maybe I'm not using the search function in Eagle's "Add" tool, but that

library had them indexed as 74*08 so no wonder searching for 74ALS08D

didn't work.

Is there a smarter way to search for any and all variations of the 74LS08?

L.

On 13/06/2015 22:10, Hoyt wrote:

74ALS645D is almost completely obsolete...you should use something else, or

at least investigate a source before you commit & order boards (for parts

that will never arrive).

 

the non-D part is in stock in a few flavors

Thanks for pointing this out. The project I want to do comes from a

magazine from around 1987.

Is the difference between the various types within a specific TTL part

(i.e. all variations of the 74_645) to do with how much power it draws

and package type? In other words, provided there's enough power

available, all variations would work?

L.

Is the difference between the various types within a specific TTL part

Sure, speed, power and often most importantly, voltage trip levels (such as

74LS08 vs cmos 74HC08 vs 74HCT08) differ.  Unless your app is very

critical, most speed & power versions will just "drop in".  Of course HC &

HCT are not TTL, they are CMOS & TTL compatible CMOS devices.

Note the "D" is just one mfg suffix for "DIP" package...others may use

something other than "D"

RCA invented CMOS, but called it COS/MOS

You can search for 7408* , since some companies also put letters in

front, because alphabet soup is good for you.

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

The project I want to do comes from a magazine from around 1987

I also have a few project from then that I need to blow the dust off &

finish up.

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

On 14/06/2015 9:10 a.m., Logyx wrote:

On 13/06/2015 16:57, Rob Pearce wrote:

On 13/06/15 09:08, Logyx wrote:

I'm trying to find the following parts:

 

74ALS645D

74ALS08D

 

They don't seem to be in the default libraries nor in any downloadable

libraries I've found.

 

Have you looked in 74xx-eu.lbr (in the standard distribution)? It

certainly has one of those.

 

Yes, found the "08" there (not 74ALS645D though)!

Maybe I'm not using the search function in Eagle's "Add" tool, but that

library had them indexed as 74*08 so no wonder searching for 74ALS08D

didn't work.

Is there a smarter way to search for any and all variations of the 74LS08?

 

L.

 

Hi

The better way to search for devices is to be in the Schematic and

perform an ADD there. In the lower portion of the ADD dialog you can

search. Wild cards work here. See the HELP.

So search for 7408*

or 74LS08

You will see a couple of libraries have 74LS08N (DIL14)

Again with 74645*

Finds 74645N (DIL20)

You can expect the footprint and gates of the 74ALS645D to be the same

as the 74645N, but do verify that using the data sheets.

As always you must verify the library parts before using them no matter

where you source them from and that includes those that come with Eagle.

HTH

Warren

On 13/06/2015 12:53, Olin Lathrop wrote:

Logyx wrote on Sat, 13 June 2015 04:08

I'm trying to find the following parts:

 

74ALS645D

74ALS08D

 

So go make them.  By time you look around for them, post a question here

about them, possibly find them somewhere, vet them, and maybe update them

to your conventions, you'd have finished making them exactly as you want

them.

I did eventually locate a 74645N (from the "74ttl-din" library).

If I do create a part (or copy and modify from another part), do I need

to include all the gates etc. or will it do fine just to create have the

IC rectangle shape with pins that are joined with the package outline?

On 14/06/2015 07:48, warrenbrayshaw wrote:

On 14/06/2015 9:10 a.m., Logyx wrote:

On 13/06/2015 16:57, Rob Pearce wrote:

The better way to search for devices is to be in the Schematic and

perform an ADD there. In the lower portion of the ADD dialog you can

search. Wild cards work here. See the HELP.

So search for 7408*

or 74LS08

You will see a couple of libraries have 74LS08N (DIL14)

 

Again with 74645*

Finds 74645N (DIL20)

That worked a whole lot better!

Yes, I've always been using the search function when in the "Add" tool

in the schematic (I didn't know there were other ways to search for

parts), but didn't know about the "*" wildcard.

How does the "attributes" function work while searching?

You can expect the footprint and gates of the 74ALS645D to be the same

as the 74645N, but do verify that using the data sheets.

 

As always you must verify the library parts before using them no matter

where you source them from and that includes those that come with Eagle.

Good idea! Thanks.