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 Forum index » DIY Hardware and Software
Datasheet for SN76488N
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openfly



Joined: Aug 17, 2008
Posts: 2
Location: NEW YORK CITY

PostPosted: Sun Aug 17, 2008 4:39 pm    Post subject: Datasheet for SN76488N
Subject description: Looking for a datasheet for the TI SN76488N
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I have an SN76488N and I want to use it for a project... but there are no datasheets anywhere on the internet. I saw it posted to a forum here, but the download link is now dead.

I would be extremely grateful if someone were to share with me that datasheet.

Please help me electro-music... you're my only hope.


-matt
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andrewF



Joined: Dec 29, 2006
Posts: 1176
Location: australia
Audio files: 4

PostPosted: Sun Aug 17, 2008 5:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

welcome welcome
here you go
build something nice!


76488.pdf
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 Filename:  76488.pdf
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openfly



Joined: Aug 17, 2008
Posts: 2
Location: NEW YORK CITY

PostPosted: Sun Aug 17, 2008 6:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Awesome! Thanks a bunch!
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achillies



Joined: Mar 15, 2019
Posts: 5
Location: Aurora, Il

PostPosted: Fri Mar 15, 2019 11:03 pm    Post subject: Preliminary Datasheets are not always correct. Reply with quote  Mark this post and the followings unread

This datasheet is bad.. just plain wrong. There is another example of this same bad pinout in the 1980 Engineers handbook, which shows the SN76488 as being the same as the SN76477, with the exception of audio input and an internal amplifier. THAT BOOK IS WRONG, and resulted in me personally toasting a few of those 88 chips. The 1982 edition has a corrected schematic for the SN76488N, showing that GROUND IS PIN 14 and VCC input on pin 12! The 77 has +VCC on pin 14 and ground on pin 2. Not the same at all, and there are a bunch of other differences.

The 1982 edition with good pinouts and a few projects is here -> http://www.achillies.com/Project_files/img/engineers-notebook-ii-a-handbook-of-integrated-circuit-applications-forrest-mims.pdf

A comparison pinout is here -> http://www.achillies.com/Project_files/img/sn76477_sn76488_pinout.png
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achillies



Joined: Mar 15, 2019
Posts: 5
Location: Aurora, Il

PostPosted: Sat Mar 16, 2019 10:05 am    Post subject: Another SN76488 project Reply with quote  Mark this post and the followings unread

I know this is an old thread, and I'm probably talking to myself, but I was trying to find a pdf of the REAL datasheet for the SN76488, but have yet to find one. There are a few images floating around that are definitely scanned from the original, but I have yet to find a copy with all of the pages/panels.

I DID find one more old magazine article though, and this one is pretty thorough. Page 69 of Jan 1984 Radio Electronics, believe it or not.

https://www.americanradiohistory.com/Archive-Radio-Electronics/80s/1984/Radio_Electronics_January_1984.CV01.pdf

If someone has a hardcopy of that old SN76488N, PLEASE share it.. sometimes there are tidbits of info on those sheets if you read between the lines. The preliminary version just doesn't cut it (and has some bad info)
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cementimental



Joined: Jun 07, 2011
Posts: 7
Location: London

PostPosted: Wed Mar 20, 2019 11:25 am    Post subject: Reply with quote  Mark this post and the followings unread

Here's a scan of an old sci-fi filmmaking magazine which contains plans for a SN76488-based sound fx box - the article says that the datasheet has errors anyway (as others have mentioned above) and that their schematic is better! https://archive.org/details/CineMagic018/
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achillies



Joined: Mar 15, 2019
Posts: 5
Location: Aurora, Il

PostPosted: Wed Mar 20, 2019 5:18 pm    Post subject: The original datasheets were missing Reply with quote  Mark this post and the followings unread

That's a great article to add to my collection. I bought my SN76488N's back in the early 80's, and I actually remember buying them. I bought two, both were in the clearance bin, and neither had datasheets. I wonder if the bad datasheets were pulled by radio shack or TI, and that's what relegated these (the only ones they had) to the clearance bin.

Incidentally, I just finished my 76488 Demo pcb (based on the demo box from that radio electronics article, with differences on one shot logic and external vco control, which were taken more from the sn76477 datasheet). Here's a pic.


2019-03-20 19.09.06.jpg
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PCBs for the SN76488 and SN76477s
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2019-03-20 19.09.06.jpg


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cementimental



Joined: Jun 07, 2011
Posts: 7
Location: London

PostPosted: Wed Mar 20, 2019 11:43 pm    Post subject: Reply with quote  Mark this post and the followings unread

No probs Smile I've been hoarding info about these things for a while, got mine on ebay some time ago (plus a couple of 77s) and really need to get round to building something

those look great!
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MusicMan11712



Joined: Aug 08, 2009
Posts: 1050
Location: Out scouting . . .

PostPosted: Tue Apr 02, 2019 3:43 pm    Post subject: Re: Another SN76488 project Reply with quote  Mark this post and the followings unread

achillies wrote:
If someone has a hardcopy of that old SN76488N, PLEASE share it.. sometimes there are tidbits of info on those sheets if you read between the lines. The preliminary version just doesn't cut it (and has some bad info)
I have an original of the Archer/Radio Shack/Tandy Technical Data sheet that came with the SN76477N (as well as an almost unused original chip) from when they first came out [Catalog Number 276-1765]. I assume the complete datasheet for that one [8 panels] is available online and you wouldn't need anything that's on it, but maybe not.
--Steve
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achillies



Joined: Mar 15, 2019
Posts: 5
Location: Aurora, Il

PostPosted: Thu Apr 04, 2019 4:34 pm    Post subject: Datasheet for SN76477N Reply with quote  Mark this post and the followings unread

Thanks for posting. It sounds like we had similar pasts, because I've got the original datasheet(s) for my 77's as well. I also have originals for the SN94281 and SAD1024 chips, but I think those are easily found on the internet as well (the datasheets, not necessarily the chips, even though I do have an sad1024 still in the original package).
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Ayab



Joined: Oct 27, 2015
Posts: 146
Location: London, UK

PostPosted: Sun Apr 07, 2019 1:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you Achilies for linking to the Forest Mimms IC applications handbook that is really useful.

Hey Cementimental that Cinemagic soundbox article is excellent.

Achilies your pcb adapted from the soundbox looks great - it would probably save me a great deal of frustration if you would kindly share your layout Wink

Btw AchillesI recently read Delton Horn and recognise the comparison pinout page you linked to - have you seen his SN76488 example sound effect generator (fig. 3.79) - attached.


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Screen Shot 2019-04-07 at 10.14.50.png


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achillies



Joined: Mar 15, 2019
Posts: 5
Location: Aurora, Il

PostPosted: Fri Apr 12, 2019 5:37 pm    Post subject: My PCB layouts for SN76477 and SN76488 Reply with quote  Mark this post and the followings unread

Ok, here are my PCB layouts and silkscreens for both chips. I have yet to actually populate the boards and test either, so use at your own risk, and be sure to check all of the traces.

SVG files are not allowed, so these were saved as PNG files. Make sure to verify spacing, etc..

If you need the svg files, let me know, and I can post them on my website for download.


76488_pcb.png
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76488_pcb.png



76477_pcb.png
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76477_pcb.png


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MusicMan11712



Joined: Aug 08, 2009
Posts: 1050
Location: Out scouting . . .

PostPosted: Sat Apr 13, 2019 9:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice!!! Thanks for sharing. Maybe this will inspire me to do something with my SN76477. It was moved from the back burner to the deep freezer decades ago, but it might be worth testing to see if it survived.

When Radio Shack closed most of its stores (all of them?) a few years ago, I picked up the "Electronic Learning Lab" for something like 80% off the list price (the one with two 8.5 x 11 Forrest Mimms Workbooks--reminders of the little books from ages ago which you can find on line).

The 555 LED test circuit on there has been collecting dust long enough. If I do replace it with the SN76477, I will owe you big thanks for reminding me of the chip!!

Steve
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