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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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vintage IC data ...
Anybody got a sheet for a Texas Instruments TMS3874 digital clock IC ? Loads
of references on the 'net, and people claiming to be suppliers and having a datasheet, but you just finish up getting led down the path to companies in China, with no sign of the actual sheet ... Just the pin-out will do if nothing else available. It's a 'rescue' project for a very old mate, so not desperately important, but it would be nice to get it going for him again, as it was an apprentice piece that he built 38 years ago, and it has worked all that time until last week, when it just suddenly stopped. I'm loathe to believe that the IC itself has failed, but you never know ... Arfa |
#2
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vintage IC data ...
On Sat, 6 Sep 2014 14:26:28 +0100, "Arfa Daily"
wrote: Anybody got a sheet for a Texas Instruments TMS3874 digital clock IC ? Loads of references on the 'net, and people claiming to be suppliers and having a datasheet, but you just finish up getting led down the path to companies in China, with no sign of the actual sheet ... Just the pin-out will do if nothing else available. It's a 'rescue' project for a very old mate, so not desperately important, but it would be nice to get it going for him again, as it was an apprentice piece that he built 38 years ago, and it has worked all that time until last week, when it just suddenly stopped. I'm loathe to believe that the IC itself has failed, but you never know ... Arfa I made a similar clock back in the day which still works well. It originally used 7400 series TTL logic and Monsanto MAN-1 leds. A few years later, I updated it to one of those "new fangled" clock chips. Anyway, I just wenting looking for it in case it has the same chip, but no such luck. It uses a National MM5311. There are plenty of data sheets for that on the net, but not for your TI. Any chance the pinouts are the same/similar? Pat |
#3
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vintage IC data ...
On Sat, 6 Sep 2014, Arfa Daily wrote:
Anybody got a sheet for a Texas Instruments TMS3874 digital clock IC ? Loads of references on the 'net, and people claiming to be suppliers and having a datasheet, but you just finish up getting led down the path to companies in China, with no sign of the actual sheet ... Just the pin-out will do if nothing else available. It's a 'rescue' project for a very old mate, so not desperately important, but it would be nice to get it going for him again, as it was an apprentice piece that he built 38 years ago, and it has worked all that time until last week, when it just suddenly stopped. I'm loathe to believe that the IC itself has failed, but you never know ... I know at one point I looked up some clock ICs in the NTE replacement guide, and found what I was looking for. So checking one of those might provide the pinout. Michael |
#4
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vintage IC data ...
On Sat, 6 Sep 2014, Pat wrote:
On Sat, 6 Sep 2014 14:26:28 +0100, "Arfa Daily" wrote: Anybody got a sheet for a Texas Instruments TMS3874 digital clock IC ? Loads of references on the 'net, and people claiming to be suppliers and having a datasheet, but you just finish up getting led down the path to companies in China, with no sign of the actual sheet ... Just the pin-out will do if nothing else available. It's a 'rescue' project for a very old mate, so not desperately important, but it would be nice to get it going for him again, as it was an apprentice piece that he built 38 years ago, and it has worked all that time until last week, when it just suddenly stopped. I'm loathe to believe that the IC itself has failed, but you never know ... Arfa I made a similar clock back in the day which still works well. It originally used 7400 series TTL logic and Monsanto MAN-1 leds. A few years later, I updated it to one of those "new fangled" clock chips. Anyway, I just wenting looking for it in case it has the same chip, but no such luck. It uses a National MM5311. There are plenty of data sheets for that on the net, but not for your TI. Any chance the pinouts are the same/similar? It wouldn't have been a second source, so you can't trust it to be "close". The amusing thing is, if you went from ttl to an LSI clock, you missed the step after that. A few years into the build your own clock phase, where all those companies sold the needed parts and maybe a circuit board, the semiconductor companies came out with clock modules, so all you had to do was wire them to the power supply and some switches. Michael |
#5
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vintage IC data ...
On 9/6/2014 9:26 AM, Arfa Daily wrote:
Anybody got a sheet for a Texas Instruments TMS3874 digital clock IC ? Loads of references on the 'net, and people claiming to be suppliers and having a datasheet, but you just finish up getting led down the path to companies in China, with no sign of the actual sheet ... Just the pin-out will do if nothing else available. It's a 'rescue' project for a very old mate, so not desperately important, but it would be nice to get it going for him again, as it was an apprentice piece that he built 38 years ago, and it has worked all that time until last week, when it just suddenly stopped. I'm loathe to believe that the IC itself has failed, but you never know ... Arfa There's some info here in the description and image 4/6 shows the IC (IC106): http://www.google.com/patents/US4348582 |
#6
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vintage IC data ...
In article ,
"Arfa Daily" wrote: Anybody got a sheet for a Texas Instruments TMS3874 digital clock IC ? Loads of references on the 'net, and people claiming to be suppliers and having a datasheet, but you just finish up getting led down the path to companies in China, with no sign of the actual sheet ... Just the pin-out will do if nothing else available. It's a 'rescue' project for a very old mate, so not desperately important, but it would be nice to get it going for him again, as it was an apprentice piece that he built 38 years ago, and it has worked all that time until last week, when it just suddenly stopped. I'm loathe to believe that the IC itself has failed, but you never know ... Arfa- Take a look at http://books.google.com/books?id=_y8...=PA428&dq=TMS3 874+data&source=bl&ots=Qb2KpQ9mTw&sig=kI0fB8cp7tDr SFZ8pkZElVltO4c&hl=en&s a=X&ei=SzsLVJy8JM6nyATV64KYCw&ved=0CD8Q6AEwCQ#v=on epage&q=TMS3874%20data& f=false. (Page 428, Circuit 1152.) Fred |
#7
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vintage IC data ...
"Michael Black" wrote in message xample.org... On Sat, 6 Sep 2014, Arfa Daily wrote: Anybody got a sheet for a Texas Instruments TMS3874 digital clock IC ? Loads of references on the 'net, and people claiming to be suppliers and having a datasheet, but you just finish up getting led down the path to companies in China, with no sign of the actual sheet ... Just the pin-out will do if nothing else available. It's a 'rescue' project for a very old mate, so not desperately important, but it would be nice to get it going for him again, as it was an apprentice piece that he built 38 years ago, and it has worked all that time until last week, when it just suddenly stopped. I'm loathe to believe that the IC itself has failed, but you never know ... I know at one point I looked up some clock ICs in the NTE replacement guide, and found what I was looking for. So checking one of those might provide the pinout. Michael Thanks for the suggestion. I'll give it a go Arfa |
#8
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vintage IC data ...
"JC" wrote in message ... On 9/6/2014 9:26 AM, Arfa Daily wrote: Anybody got a sheet for a Texas Instruments TMS3874 digital clock IC ? Loads of references on the 'net, and people claiming to be suppliers and having a datasheet, but you just finish up getting led down the path to companies in China, with no sign of the actual sheet ... Just the pin-out will do if nothing else available. It's a 'rescue' project for a very old mate, so not desperately important, but it would be nice to get it going for him again, as it was an apprentice piece that he built 38 years ago, and it has worked all that time until last week, when it just suddenly stopped. I'm loathe to believe that the IC itself has failed, but you never know ... Arfa There's some info here in the description and image 4/6 shows the IC (IC106): http://www.google.com/patents/US4348582 Thanks Arfa |
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