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Sci.Electronics.Basics -> how to find compatible component ? search made me bleary brained
There are 11 messages in this thread.
You are currently looking at messages 1 to 11.
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Author: robbDate: 10:38 30-11-07
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so i have a **DM7496** (DIP16) that is fried (obsolete), and i
need compatible replacement
datasheet says 5-Bit shift register, R-S master slave flip
flops , parallel in/out, serial in/out
how does one go about finding a suitable replacement ? what words
to look for ?
I have found lots of 8-Bit shift register ICs, universal, shift,
latch, storage, s->p, p->s, and various varieties but nothing
that looks similar or familiar to the 7496 datasheet
then i suppose if i find a similar 8-Bit shift reg version i will
need to do something special to the 3 regs not needed or used ???
like ability to address/mask/disable certain regs or address
where i get serial out from or maybe use the #5 parrallel out as
source for serial out ? and let the last 3 regs float ??
any helpful ideas very very welcomed,
robb
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Author: John LarkinDate: 11:12 30-11-07
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On Fri, 30 Nov 2007 10:38:24 -0500, "robb" <some@where.on.net> wrote:
>so i have a **DM7496** (DIP16) that is fried (obsolete), and i
>need compatible replacement
>datasheet says 5-Bit shift register, R-S master slave flip
>flops , parallel in/out, serial in/out
>
>how does one go about finding a suitable replacement ? what words
>to look for ?
>
>I have found lots of 8-Bit shift register ICs, universal, shift,
>latch, storage, s->p, p->s, and various varieties but nothing
>that looks similar or familiar to the 7496 datasheet
>
>then i suppose if i find a similar 8-Bit shift reg version i will
>need to do something special to the 3 regs not needed or used ???
>like ability to address/mask/disable certain regs or address
>where i get serial out from or maybe use the #5 parrallel out as
>source for serial out ? and let the last 3 regs float ??
>
>any helpful ideas very very welcomed,
>robb
>
http://store.americanmicrosemiconductor.com/sn7496.html
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Author: Martin CrossleyDate: 12:00 30-11-07
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John Larkin wrote:
> On Fri, 30 Nov 2007 10:38:24 -0500, "robb" <some@where.on.net>
wrote:
>
>> so i have a **DM7496** (DIP16) that is fried (obsolete), and i
>> need compatible replacement
>> datasheet says 5-Bit shift register, R-S master slave flip
>> flops , parallel in/out, serial in/out
>>
>> how does one go about finding a suitable replacement ? what words
>> to look for ?
>>
SNIP
>> any helpful ideas very very welcomed,
>> robb
>>
>
> http://store.americanmicrosemiconductor.com/sn7496.html
If you search Ebay for SN7496N, SN7496 and 7496, there's quite a choice.
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Author: EeyoreDate: 12:15 30-11-07
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robb wrote:
> so i have a **DM7496** (DIP16) that is fried (obsolete), and i
> need compatible replacement
The vital piece of info*7496*. DM is simply a manufacturer specific prefix.
This means it's a standard 74 series TTL part. These are still widely available
in more modern versions. You may have trouble finding a genuine original 74
series part (the specs are very outdated now) but very likely an 'LS series part
(74LS96) or HCMOS 74HC(T)96 will function as a drop-in replacement.
Graham
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Author: JeffMDate: 13:39 30-11-07
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Author: robbDate: 15:34 30-11-07
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Thanks John for the help,
Looks like a i jumped the gun... i had become so flustered
*not*-finding the obsolete parts i have needed lately that i just
plain gave up on google/yahoo-ing first.
i just went to digikey since they have been most consistent
source and they had nothing. after reading your's and other posts
i checked mouser and they have a compatible sub. probably the
same one jeffm pointed out.
To recover (save face) somewhat :}
Hypothetically speaking,
any ideas on how or what one does to replace such obsolete parts
when there is no direct drop in equiv :) EG. could the 8 bit
shift reg IC be **creatively** used to implement a 5 bit shift
reg IC or would one need to find a lowest denominator of ICs to
construct an equivalent circuit ?
sorry people if i jumped the question gun,
robb
"John Larkin" <jjlarkin@highNOTlandTHIStechnologyPART.com> wrote
in message news:qid0l3t407mnb1ben3eautqb6ck48hdm4b@4ax.com...
> On Fri, 30 Nov 2007 10:38:24 -0500, "robb" <some@where.on.net>
wrote:
>
> >so i have a **DM7496** (DIP16) that is fried (obsolete), and
i
> >need compatible replacement
> >datasheet says 5-Bit shift register, R-S master slave flip
> >flops , parallel in/out, serial in/out
> >
> >how does one go about finding a suitable replacement ? what
words
> >to look for ?
> >
> >I have found lots of 8-Bit shift register ICs, universal,
shift,
> >latch, storage, s->p, p->s, and various varieties but nothing
> >that looks similar or familiar to the 7496 datasheet
> >
> >then i suppose if i find a similar 8-Bit shift reg version i
will
> >need to do something special to the 3 regs not needed or used
???
> >like ability to address/mask/disable certain regs or address
> >where i get serial out from or maybe use the #5 parrallel out
as
> >source for serial out ? and let the last 3 regs float ??
> >
> >any helpful ideas very very welcomed,
> >robb
> >
>
> http://store.americanmicrosemiconductor.com/sn7496.html
>
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Author: robbDate: 15:35 30-11-07
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Author: robbDate: 15:48 30-11-07
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"Eeyore" <rabbitsfriendsandrelations@hotmail.com> wrote in
message news:4750452B.941A3EC9@hotmail.com...
>
>
> robb wrote
> > so i have a **DM7496** (DIP16) that is fried (obsolete),
and i
> > need compatible replacement
>
> The vital piece of info*7496*. DM is simply a manufacturer
specific prefix.
>
> This means it's a standard 74 series TTL part. These are still
widely available
> in more modern versions. You may have trouble finding a genuine
original 74
> series part (the specs are very outdated now) but very likely
an 'LS series part
> (74LS96) or HCMOS 74HC(T)96 will function as a drop-in
replacement.
>
Thanks Graham,
thanks for info, if i can keep all this stuff in my head i might
accomplish something .
i did happen to find a compatible part through mouser, iguess i
troubled the group to soon.
thanks again,
robb
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Author: robbDate: 15:59 30-11-07
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Author: kilowattDate: 16:53 30-11-07
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Hello Robb
I have lots of these in my back room of 12300 part numbers.
This may solve your problem of finding this part. Contact me
if you still need this part. They run about $2 or 3 dollars + shpg.
surplus addict.:-)
kilowatt
*************************************
On Nov 30, 7:38 am, "robb" <s...@where.on.net> wrote:
> so i have a **DM7496** (DIP16) that is fried (obsolete), and i
> need compatible replacement
> datasheet says 5-Bit shift register, R-S master slave flip
> flops , parallel in/out, serial in/out
>
> how does one go about finding a suitable replacement ? what words
> to look for ?
>
> I have found lots of 8-Bit shift register ICs, universal, shift,
> latch, storage, s->p, p->s, and various varieties but nothing
> that looks similar or familiar to the 7496 datasheet
>
> then i suppose if i find a similar 8-Bit shift reg version i will
> need to do something special to the 3 regs not needed or used ???
> like ability to address/mask/disable certain regs or address
> where i get serial out from or maybe use the #5 parrallel out as
> source for serial out ? and let the last 3 regs float ??
>
> any helpful ideas very very welcomed,
> robb
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Author: John FieldsDate: 18:30 30-11-07
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On Fri, 30 Nov 2007 15:34:14 -0500, "robb" <some@where.on.net>
wrote:
>Thanks John for the help,
>
>Looks like a i jumped the gun... i had become so flustered
>*not*-finding the obsolete parts i have needed lately that i just
>plain gave up on google/yahoo-ing first.
>
>i just went to digikey since they have been most consistent
>source and they had nothing. after reading your's and other posts
>i checked mouser and they have a compatible sub. probably the
>same one jeffm pointed out.
>
>To recover (save face) somewhat :}
>Hypothetically speaking,
>any ideas on how or what one does to replace such obsolete parts
>when there is no direct drop in equiv :) EG. could the 8 bit
>shift reg IC be **creatively** used to implement a 5 bit shift
>reg IC or would one need to find a lowest denominator of ICs to
>construct an equivalent circuit ?
---
Depends on how the chip is used. For example, if all of the pin
functions are used, you could build an equivalent with three 7474s
and two 7400s.
--
JF
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