Fwd: [roys-tech-chat] Building replacement for TTL counter DM8552 (National Semiconductor)
10 Apr
2008
10 Apr
'08
9:56 a.m.
Have any of you guys ever heard of this chip? It's new to me...
---------- Forwarded Message ----------
Subject: [roys-tech-chat] Building replacement for TTL counter DM8552
(National Semiconductor)
Date: Thursday 10 April 2008 08:58
From: "Michel" <itloiiw at yahoo.com>
To: roys-tech-chat at yahoogroups.com
Hello all,
I am trying to repair a Systron Donner Frequency Counter model 6254
that does not count well. This counter is build with "simple" TTL
chips only. (I have no manual nor schematic).
The culprit (found by swapping chips) is a TTL chip from NS : DM8552
It is a decade counter with latches and tri-state outputs.
Since I did not find any source for replacement chip, I have thought
to build some equivalent circuit with maybe 74LS160 and 74LS393.
My problem is that I have no datasheet except pinout for DM8552
(found there http://www.datasheetarchive.com/pdf/1215336.pdf ).
Does anybody have more information about it ?
Many thanks in advance,
Michel
Grenoble - France.
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Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
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-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
10 Apr
10 Apr
11:14 a.m.
Have any of you guys ever heard of this chip?
It's new to me...
It should be in the National Semiconductor 1974 (IIRC) "Logic" databook.
I don't have mine handy, but one could probably get a photocopy at
Halted in Sunnyvale.
National Semiconductor, Signetics, Motorola, and probably other vendors
had their own proprietary series of TTL chips before it became apparent
that the 7400 series was going to win. It was a source of considerable
confusion that the Motorola TTL parts were the MC4000 series, which was
completely different from the RCA CD4000 series CMOS (and its equivalents).
Because Motorola was already using 4000 series numbers for their TTL,
when they added CD4000 equivalent CMOS parts to their product line, they
added a leading one, making it the MC14000 series.
I've long wondered how much money one could get for the MC4040 on eBay:
"rare Motorola 4040 chip" :-)
12:23 p.m.
On Thursday 10 April 2008 14:14, Eric Smith wrote:
He's in Europe. :-)
He did snag that datasheet (as did I) mentioned in the original post, and it
doesn't say much about how the inputs act, which is where the problem is.
Have any of
you guys ever heard of this chip? It's new to me...
It should be in the National Semiconductor 1974 (IIRC) "Logic" databook.
I don't have mine handy, but one could probably get a photocopy at
Halted in Sunnyvale. From a subsequent post where I'd asked about date
codes:
"The datecodes indicate year 1980.
This chip is appropriate for building a counter with multiplexed LED
display because of the tri-state latched outputs. But I'm a bit
puzzled by the names of input pins. Some are close to what can be
found in more usual counters (74160, etc.), but I'm not sure they
behave the same !"
That's later than I would have thought.
National Semiconductor, Signetics, Motorola, and
probably other vendors
had their own proprietary series of TTL chips before it became apparent
that the 7400 series was going to win.
Yeah, I have some data on that stuff but not very much.
It was a source of considerable confusion that the
Motorola TTL parts were
the MC4000 series, which was completely different from the RCA CD4000 series
CMOS (and its equivalents).
I do know about "MTTL I", "II", and "III" :-) and why it is
that Motorola had
to use 14000 numbers for their versions of CMOS parts. I've never been all
that clear on the exact differences between the series, but then since I've
never run into them anyhow (excepting some MC4044s I have here) it's not been
much of a problem.
Because Motorola was already using 4000 series numbers
for their TTL,
when they added CD4000 equivalent CMOS parts to their product line, they
added a leading one, making it the MC14000 series.
Yup...
I've long wondered how much money one could get
for the MC4040 on eBay:
"rare Motorola 4040 chip" :-)
I don't recall offhand what the MC4040 was. The MC4044 is a bit of an
interesting part, though. Used in some early c64s, in conjunction with
74LS629 if I'm remembering right.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
2:28 p.m.
I wrote:
It should be in the National Semiconductor 1974 (IIRC)
"Logic" databook.
I don't have mine handy, but one could probably get a photocopy at
Halted in Sunnyvale.
Roy wrote:
He's in Europe. :-)
I pointed it out because:
1) It might be possible to find that databook (or another National
Logic databook from that era) in a similar electronic surplus
store elsewhere.
2) Someone on the list could go to Halted, get a copy, and scan it
for him. I didn't volunteer to do that myself because I'm too
busy right now, but if he doesn't get the real datasheet from
somewhere else soon, I might be able to do it.
I don't recall offhand what the MC4040 was.
IIRC, it's a (dual?) four-line demultiplexer.
Eric
2:38 p.m.
On Thursday 10 April 2008 17:28, Eric Smith wrote:
I do have some old Motorola books around here someplace, but right now I have
no idea which box they're in. I notice that one's missing from my parts
pages, too. Perhaps one of these days I'll find the time to work on fixing
that... :-)
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
I wrote:
Ok, forwarded to my tech-chat list...
It should be in the National Semiconductor 1974
(IIRC) "Logic" databook.
I don't have mine handy, but one could probably get a photocopy at
Halted in Sunnyvale.
Roy wrote:
He's in Europe. :-)
I pointed it out because:
1) It might be possible to find that databook (or another National
Logic databook from that era) in a similar electronic surplus
store elsewhere.
2) Someone on the list could go to Halted, get a copy, and scan it
for him. I didn't volunteer to do that myself because I'm too
busy right now, but if he doesn't get the real datasheet from
somewhere else soon, I might be able to do it. I don't
recall offhand what the MC4040 was.
IIRC, it's a (dual?) four-line demultiplexer. 
11 Apr
11 Apr
9:40 a.m.
Because Motorola was already using 4000 series numbers
for their TTL,
when they added CD4000 equivalent CMOS parts to their product line,
they added a leading one, making it the MC14000 series.
Ah! I'd recently been going through my "miscellaneous ICs" collection,
after getting an few hundred dollars in chips from Digikey as a refill,
as it were, of my stock of logic. I'd come to a kind of suspicion that
MC14xxx could be looked up by stripping the MC1, but it was just a
suspicion, and I think I have a few MC4xxx parts as well.
I'm glad to have that straightened out. Thank you.
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10 Apr
10 Apr
1:51 p.m.
New subject: Fwd: [roys-tech-chat] Building replacement for TTL counter DM8552(National Semiconductor)
"Roy J. Tellason" wrote:
Have any of you guys ever heard of this chip? It's new to me...
---------- Forwarded Message ----------
Subject: [roys-tech-chat] Building replacement for TTL counter DM8552
(National Semiconductor)
Date: Thursday 10 April 2008 08:58
From: "Michel" <itloiiw at yahoo.com>
To: roys-tech-chat at yahoogroups.com
Hello all,
I am trying to repair a Systron Donner Frequency Counter model 6254
that does not count well. This counter is build with "simple" TTL
chips only. (I have no manual nor schematic).
The culprit (found by swapping chips) is a TTL chip from NS : DM8552
It is a decade counter with latches and tri-state outputs.
Since I did not find any source for replacement chip, I have thought
to build some equivalent circuit with maybe 74LS160 and 74LS393.
My problem is that I have no datasheet except pinout for DM8552
(found there http://www.datasheetarchive.com/pdf/1215336.pdf ).
Does anybody have more information about it ?
Many thanks in advance,
Michel
Grenoble - France.
Usually I'm asking about weird NatSemi chips, but this is one I can help with,
I have it documented in a 1976 NS TTL databook. I'll communicate with the OP to
try to get info to him. The 8552 has some other unusual features to support
zero-blanking.
(..always happy to talk about electronic counters, just yesterday I got an HP
524B from
1957 functioning, after two weeks of cleaning it up.
It's a boat anchor, but it's tube digital (84 tubes). (But it's probably OT
for
this list).
6100
days inactive
6101
days old
6 comments
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participants (4)
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eric＠brouhaha.com -
hilpert＠cs.ubc.ca -
mouse＠Rodents.Montreal.QC.CA -
rtellason＠verizon.net