Need Substitute for PN 443-29

[Ray Mack]

Mike is right.  It is most likely DTL or RTL from Fairchild.  Motorola made the
same series but without the leading 9 (i.e. 9958 and 958 were the same part).
There was also a 800 series from MOtorola that would work if you get the right
pinouts. In the early 70's I worked on Blood Analysers that used this stuff by
the ton.  I even used to have an incredible amount of spares about 15 years ago
:<(

I just looked in my latest Jameco catalog and VOILA! they *still* have the MC846
listed!!!  You might give them a call (800-831-4242) and see if they have any of
the other stuff available.  They used to have a lot of that stuff in their
catalog until a few years ago.

I don't have a recent NTE catalog, but they might also have something that
ancient.  Try crossing to an MC958 and MC959.

Ray Mack
WD5IFS
mack at mails.imed.com
Friendswood (Houston), TX

______________________________ Reply Separator _________________________________
Subject: Re: Need Substitute for PN 443-29
Author:  Mike Morris <morris at COGENT.NET> at mails
Date:    5/8/98 12:47 AM


At 04:42 AM 05/07/98 -0700, you wrote:
>I am trying to cross reference an Integrated circuit Heathkit part number
>443-29.  It is a buffer storage device in a 16 pin dip package.  The part
>description in the manual is C'Greek letter mu'L9959 where 'Greek letter
>mu' is the same as the micro symbol.
>The decade counter has a similar part number 443-28 described as a
>C'Greek letter mu'L9958 decade counter.

Sounds like Fairchild "MicroLogic" RTL line from the late 60s -
early 70s era.
The key will be the supply voltage: RTL lived on +3.6v and ground,
DTL and TTL lived on +5 and ground.  After I saw your posting I looked
around here but I have nothing on the 99xx series chips.

HOWEVER---  on the hunch that the leading 9 might have been a
temperature range, package info, etc, I looked farther...

The the 959 is a RTL 16 pin package that is a 4-bit latch, and
the 958 is a decade counter.  I have the pinouts if you need them.
I'm looking at page 2-201 of the 1975 "Full Line Condensed Catalog".
Send me a fax number by email and I'll send you the two pages that
discuss RTL (which was effectively dead by 1975).

What kit was it in?  If there's only a few chips, I've converted
several RTL designs to TTL.

Mike Morris - WA6ILQ

--- --- --- --- --- --- --- --- --- --- --- --- --- --
To subscribe: listserv at listserv.tempe.gov
and in body: subscribe HEATH yourfirstname yourlastname
To unsubscribe:  listserv at listserv.tempe.gov
and in body: signoff HEATH
Archives for HEATH: http://www.tempe.gov/archives
--- --- --- --- --- --- --- --- --- --- --- --- --- --

--- --- --- --- --- --- --- --- --- --- --- --- --- --
To subscribe: listserv at listserv.tempe.gov
and in body: subscribe HEATH yourfirstname yourlastname
To unsubscribe:  listserv at listserv.tempe.gov
and in body: signoff HEATH
Archives for HEATH: http://www.tempe.gov/archives
--- --- --- --- --- --- --- --- --- --- --- --- --- --