7 Jan
2005
7 Jan
'05
6:07 a.m.
The MC789 is a hex inverter, a 7404 or 7406 could be used but the pin-out is
different
--
The only thing it has in common with a TTL inverter is the function it performs.
RTL logic, power supply, and switching performance are NOT the same as TTL.
I have the RTL section of the 1969 Motorola microelectronics catalog scanned
I'll see about getting it on line later today.
7 Jan
7 Jan
6:17 a.m.
For the projects mentioned TTL will work. It interfaces to other TTL chips
and darlinton switches. The timing is extremely liberal so switching
performance is not an issue. It uses a +5v power supply.
Randy
----- Original Message -----
From: "Al Kossow" <aek(a)spies.com>
To: <classiccmp(a)classiccmp.org>
Sent: Friday, January 07, 2005 11:07 AM
Subject: Re: RTL Logic
The MC789 is a hex inverter, a 7404 or 7406 could be used but the pin-out
is
different
--
The only thing it has in common with a TTL inverter is the function it
performs.
RTL logic, power supply, and switching performance are NOT the same as
TTL.
I have the RTL section of the 1969 Motorola microelectronics catalog
scanned
I'll see about getting it on line later today.
6:29 a.m.
I forgot to mention:
While I believe that a "modern" inverter will work for these three projects
I do not claim that is always the case.
It would be great to have an online source for RTL specs, like most people I
have no RTL docs.
I based my opinion of using a TTL chip in place of RTL on the schematics and
timing diagrams. In this case I believe that TTL would work OK.
Randy
www.s100-manuals.com
----- Original Message -----
From: "Randy McLaughlin" <randy(a)s100-manuals.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)classiccmp.org>
Sent: Friday, January 07, 2005 11:17 AM
Subject: Re: RTL Logic
For the projects mentioned TTL will work. It
interfaces to other TTL
chips and darlinton switches. The timing is extremely liberal so
switching performance is not an issue. It uses a +5v power supply.
Randy
----- Original Message -----
From: "Al Kossow" <aek(a)spies.com>
To: <classiccmp(a)classiccmp.org>
Sent: Friday, January 07, 2005 11:07 AM
Subject: Re: RTL Logic
The MC789 is a hex inverter, a 7404 or 7406 could be used but the pin-out
is
different
--
The only thing it has in common with a TTL inverter is the function it
performs.
RTL logic, power supply, and switching performance are NOT the same as
TTL.
I have the RTL section of the 1969 Motorola microelectronics catalog
scanned
I'll see about getting it on line later today.
8:34 a.m.
It would be great to have an online source for RTL
specs, like most people I
have no RTL docs.
But there are many RTL families, and only some are compatible. RTL
isn't a brand name, it means only "resistor-transistor logic". TTL
is also quite accurately described as "resistor-transistor logic",
"branding" was done there certainly to distinguish, and today,
nearly all "TTL" families died off except the TI 74xx stuff, but
you can't extrapolate backwards.
(I don't mean to start a pissing match over meanings of acronyms
(TTL, RTL, DTL, etc), I speak loosely to warn about not taking
names too seriously.)
I have some few datasheets for early logic families here:
http://wps.com/archives/solid-state-datasheets/index.html
8:49 a.m.
I am working with others to archive some computer related documents.
I added your link to my favorites and will look at it when I get a chance.
Too many olders docs are just considered that - older docs, and are thrown
away. Later when you want or need them they are not available.
Randy
www.s100-manuals.com
----- Original Message -----
From: "Tom Jennings" <tomj(a)wps.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)classiccmp.org>
Sent: Friday, January 07, 2005 1:34 PM
Subject: Re: RTL Logic
It would be
great to have an online source for RTL specs, like most
people I have no RTL docs.
But there are many RTL families, and only some are compatible. RTL
isn't a brand name, it means only "resistor-transistor logic". TTL
is also quite accurately described as "resistor-transistor logic",
"branding" was done there certainly to distinguish, and today,
nearly all "TTL" families died off except the TI 74xx stuff, but
you can't extrapolate backwards.
(I don't mean to start a pissing match over meanings of acronyms
(TTL, RTL, DTL, etc), I speak loosely to warn about not taking
names too seriously.)
I have some few datasheets for early logic families here:
http://wps.com/archives/solid-state-datasheets/index.html 
6:23 a.m.
On Fri, 2005-01-07 at 17:07, Al Kossow wrote:
The MC789 is a hex inverter, a 7404 or 7406 could be
used but the pin-out is
different
--
The only thing it has in common with a TTL inverter is the function it performs.
RTL logic, power supply, and switching performance are NOT the same as TTL.
I have the RTL section of the 1969 Motorola microelectronics catalog scanned
I'll see about getting it on line later today.
Hmmm, with surface-mount components it should be possible to make an
IC-sized board which is functionally equivalent, but you'd have to be
pretty keen.
If the OP is not intending to use the original board layout or any RTL
devices, then there shouldn't be a problem in translating the design
into TTL, but then why not go the whole way and put it into an FPGA?
--
Lawrence Wilkinson lawrence(a)ljw.me.uk
Ph +44(0)1869-811059 http://www.ljw.me.uk
8:28 a.m.
The MC789 is a hex inverter, a 7404 or 7406 could be
used but the pin-out is
different
On Fri, 7 Jan 2005, Al Kossow wrote:
The only thing it has in common with a TTL inverter is
the function it performs.
RTL logic, power supply, and switching performance are NOT the same as TTL.
Al's right. For lamp drivers etc just stuff it in, but if it's
buried in the guts of high-speed ALU you're in for a project. I'm
sure many can be retrofit, but you'll need to be very adept at
reading spec sheets (and hoep that they tell the whole truth).
7170
days inactive
7170
days old
6 comments
4 participants
participants (4)
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aek＠spies.com -
ljw-cctech＠ljw.me.uk -
randy＠s100-manuals.com -
tomj＠wps.com