22 Jan
2002
22 Jan
'02
9:59 a.m.
At 08:26 AM 1/22/02 -0700, you wrote:
These parts have been discontinued by Motorola for
about 5 years, so I'm not
surprised you're having difficulty finding them. That "SR" in the part
number
disturbs me somewhat as well, as it's not on any of
the windowed parts I
have,
and I don't think they made two 20-pin windowed
parts. I'm also not sure
what
the MC68HC701J1A has to do with any of this. The
'701 is a much older part
that never came in a 20-pin version, and, I don't think ever came in an 'HC
version either.
Opps, my mistake. I said 705 in both the subject and all but one place in
my message. I did not mean to type 701...
Perhaps the nomenclature is screwing up your search.
I'm not sure what the
correct part number for the ceramic windowed package is, but I'm not at all
sure that MC68HC705J1ACS is it. I could go look, I suppose, but it's an
easter-egg hunt, so it might take some time. If you find the right
parts-search engine, it will turn up a supply of these parts, but not at
"cheap" prices. I found 'em a couple of weeks back, after getting a spam
from
a "new" parts-search site. I have them look
for Z84C0020 and MC68HC705J1A
just to see what they turn up, and I was surprised to find that they had
pointers to supply of both, not that I want to buy either.
I am only using the ACS suffix for the windowed part as that is what the
motorola web page says for ordering information:
http://e-www.motorola.com/brdata/PDFDB/docs/MC68HC705J1A.pdf
It may be that the AS or AVS is correct as well. All that I care is that
it is a 68HC705J1A in a ceramic DIP windowed 20-pin package.
If you're really determined to use the 20-pin part,
there are a couple of
current 'HC805 and 'HC908 parts that might work for you. Mot has been trying
quite actively to kill off the 'HC05 series, but it seemingly refuses to die.
My project is to re-program an existing board which uses the 'HC705J1A, but
if I have to, I can switch to a similar and available part. I don't plan on
making a product with the part, so availability is not a big deal. I just
want to change the program in an existing board. I have a 'HC705K1 programmer
which I am hoping will program the 'HC705J1A part. The only difference seems
to be the number of I/O pins.
I remember the MOT guys discouraging me from using the
'HC705K1 (16 pins)
back
in '94. They didn[t have a 16-pin replacement from
the 'HC805 series at the
time so I used it anyway, but I also bought into the 20-pin part, since that
was still available. I've come to regret that, however. It didn't matter,
since management killed the project, but that was the last time I bought any
of the MOT MCU's. My experience has been that they don't tell the truth
about
supply, and they won't support you at volumes under
100K parts per week.
They
use distributors who won't supply you at levels
like 200 per week, either, so
most of my clients are screwed with MOT parts. Consequently, I haven't used,
or even considered, a MOT part of any sort since '94.
Dick
--tom
----- Original Message -----
From: "Tom Uban" <uban(a)ubanproductions.com>
To: <classiccmp(a)classiccmp.org>
Sent: Monday, January 21, 2002 10:59 PM
Subject: Re: windowed MC68HSR705J1ACS ?
$60.
I'm after the 20-pin DIP ceramic windowed
part vs. the OTP part. The part
number that I indicated (MC68HC705J1ACS) should be the one which matches
what I am looking for. No one seems to have them, including the places
that you reference, at *any* price.
--tom
At 09:10 PM 1/21/02 -0700, you wrote:
>I'm not at all convinced I know what you're after. The 20-pin 68HC705
parts
with which
I'm familiar are the MC68HC705J1A which comes in a number of
packages, one of which is the ceraminc windowed part. I don't think these
are
>unavailable in distribution, though I've never gotten one for less than
I think
the last place I saw them for sale was Future-Active electronics.
www.future-active.com, though things change, and a quick look didn't show
that
part. ISTR that DigiKey had the windowed parts
too at one time.
Dick
----- Original Message -----
From: "Tom Uban" <uban(a)ubanproductions.com>
To: <classiccmp(a)classiccmp.org>
Sent: Monday, January 21, 2002 7:11 PM
Subject: windowed MC68HSR705J1ACS ?
I am looking for a source for a MC68HSR705J1ACS
Motorola 20 pin DIP
with window (erasable) MC68HC701J1A microprocessor. I have only been
able to find the OTP versions, but would like to find an erasable
one for development. Does anyone know of a source, or have one (or 2)
that you would be willing to sell me?
--tnx
--tom