Reply by whit3rd December 17, 20112011-12-17
I'd say: drop "RS-232", and go for something
like the old Macintosh serial (EIA-423  differential)
which drives terminated lines near a kilometer long
at 230 kHz.  It's interoperable with RS-232,
but the true-differential wiring model works better.
Reply by krw...@att.bizzzzzzzzzzzz December 15, 20112011-12-15
On Thu, 15 Dec 2011 19:23:14 -0500, Jamie
<jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:

>krw@att.bizzzzzzzzzzzz wrote: > >> On Tue, 13 Dec 2011 20:45:52 -0800, Robert Baer <robertbaer@localnet.com> >> wrote: >> >> >>>linnix wrote: >>> >>>>On Dec 11, 10:03 pm, Robert Baer <robertb...@localnet.com> wrote: >>>> >>>>>linnix wrote: >>>>> >>>>>>On Dec 10, 9:00 am, "TTman" <pcw1....@ntlworld.com> wrote: >>>>>> >>>>>>>"linnix" <m...@linnix.info-for.us> wrote in message >>>>>>>news:ed841358-5bde-4a55-a9bf-372aa57eda19@f11g2000yql.googlegroups.com... >>>>>>> >>>>>>>>Gee Wee, the customer is not happy with 115K. We already determined >>>>>>>>that TI's MAX232 works up to 115K and the MAX3232 won't even work at >>>>>>>>115K (although it claims to work). I know there are pin-incompatible >>>>>>>>MAX-something, but we don't want to change layout, just for the sake >>>>>>>>of in-compatibility. Are there pin-compatible, reliable MAX232 clones >>>>>>>>for 230K that work, not just claim to work? Thanks. >>>>>>> >>>>>>>Max 3222 ? >>>>>> >>>>>>18 pins vs. 16 pins >>>>> >>>>> So, IF you can get them, just clip off 2 pins and nobody will be the >>>>>wiser.. >>>> >>>>But no TSSOP in 18 pins. Only TSSOP 20. They really make it >>>>difficult to go high speed. >>> >>> Cut off even MORE pins..that will make it faster yet: being Maxim, it >>>is already so fast that few (if anyone) get to see it... >> >> >> One of the guys I work with really likes Maxim. Apparently when you buy by >> the millions, Maxim can even deliver parts. > > Isn't that something? :)
I always knew there was *someone* buying their parts. I just didn't know who. ;-)
Reply by Jamie December 15, 20112011-12-15
krw@att.bizzzzzzzzzzzz wrote:

> On Tue, 13 Dec 2011 20:45:52 -0800, Robert Baer <robertbaer@localnet.com> > wrote: > > >>linnix wrote: >> >>>On Dec 11, 10:03 pm, Robert Baer <robertb...@localnet.com> wrote: >>> >>>>linnix wrote: >>>> >>>>>On Dec 10, 9:00 am, "TTman" <pcw1....@ntlworld.com> wrote: >>>>> >>>>>>"linnix" <m...@linnix.info-for.us> wrote in message >>>>>>news:ed841358-5bde-4a55-a9bf-372aa57eda19@f11g2000yql.googlegroups.com... >>>>>> >>>>>>>Gee Wee, the customer is not happy with 115K. We already determined >>>>>>>that TI's MAX232 works up to 115K and the MAX3232 won't even work at >>>>>>>115K (although it claims to work). I know there are pin-incompatible >>>>>>>MAX-something, but we don't want to change layout, just for the sake >>>>>>>of in-compatibility. Are there pin-compatible, reliable MAX232 clones >>>>>>>for 230K that work, not just claim to work? Thanks. >>>>>> >>>>>>Max 3222 ? >>>>> >>>>>18 pins vs. 16 pins >>>> >>>> So, IF you can get them, just clip off 2 pins and nobody will be the >>>>wiser.. >>> >>>But no TSSOP in 18 pins. Only TSSOP 20. They really make it >>>difficult to go high speed. >> >> Cut off even MORE pins..that will make it faster yet: being Maxim, it >>is already so fast that few (if anyone) get to see it... > > > One of the guys I work with really likes Maxim. Apparently when you buy by > the millions, Maxim can even deliver parts.
Isn't that something? :) Jamie
Reply by krw...@att.bizzzzzzzzzzzz December 15, 20112011-12-15
On Tue, 13 Dec 2011 20:45:52 -0800, Robert Baer <robertbaer@localnet.com>
wrote:

>linnix wrote: >> On Dec 11, 10:03 pm, Robert Baer <robertb...@localnet.com> wrote: >>> linnix wrote: >>>> On Dec 10, 9:00 am, "TTman" <pcw1....@ntlworld.com> wrote: >>>>> "linnix" <m...@linnix.info-for.us> wrote in message >>>>> news:ed841358-5bde-4a55-a9bf-372aa57eda19@f11g2000yql.googlegroups.com... >>>>>> Gee Wee, the customer is not happy with 115K. We already determined >>>>>> that TI's MAX232 works up to 115K and the MAX3232 won't even work at >>>>>> 115K (although it claims to work). I know there are pin-incompatible >>>>>> MAX-something, but we don't want to change layout, just for the sake >>>>>> of in-compatibility. Are there pin-compatible, reliable MAX232 clones >>>>>> for 230K that work, not just claim to work? Thanks. >>>>> Max 3222 ? >>>> 18 pins vs. 16 pins >>> So, IF you can get them, just clip off 2 pins and nobody will be the >>> wiser.. >> >> But no TSSOP in 18 pins. Only TSSOP 20. They really make it >> difficult to go high speed. > Cut off even MORE pins..that will make it faster yet: being Maxim, it >is already so fast that few (if anyone) get to see it...
One of the guys I work with really likes Maxim. Apparently when you buy by the millions, Maxim can even deliver parts.
Reply by Robert Baer December 14, 20112011-12-14
linnix wrote:
> On Dec 11, 10:03 pm, Robert Baer <robertb...@localnet.com> wrote: >> linnix wrote: >>> On Dec 10, 9:00 am, "TTman" <pcw1....@ntlworld.com> wrote: >>>> "linnix" <m...@linnix.info-for.us> wrote in message >>>> news:ed841358-5bde-4a55-a9bf-372aa57eda19@f11g2000yql.googlegroups.com... >>>>> Gee Wee, the customer is not happy with 115K. We already determined >>>>> that TI's MAX232 works up to 115K and the MAX3232 won't even work at >>>>> 115K (although it claims to work). I know there are pin-incompatible >>>>> MAX-something, but we don't want to change layout, just for the sake >>>>> of in-compatibility. Are there pin-compatible, reliable MAX232 clones >>>>> for 230K that work, not just claim to work? Thanks. >>>> Max 3222 ? >>> 18 pins vs. 16 pins >> So, IF you can get them, just clip off 2 pins and nobody will be the >> wiser.. > > But no TSSOP in 18 pins. Only TSSOP 20. They really make it > difficult to go high speed.
Cut off even MORE pins..that will make it faster yet: being Maxim, it is already so fast that few (if anyone) get to see it...
Reply by Jim Stewart December 13, 20112011-12-13
Cydrome Leader wrote:
> In sci.electronics.design hamilton<hamilton@nothere.com> wrote: >> On 12/12/2011 9:42 AM, linnix wrote: >>> Max 3222 >> >> The MAX 3222 has the same pin out for the lower 16-pins and the MAX 232. >> ( they must have thought this thru) >> >> Pin 1 and 18 are *Enable and *Shutdown. >> >> So, this part can be made to work, if Blue wires don't bother you till >> the next board layout. > > haha, blue wires. Is there some corporate talk name for these that anybody > has heard?
When I worked for DEC in the early 70's, all the backplanes were wired with yellow-white wire. ECO's could be applied with any color wire *but* yellow-white and field service issued blue wire, so that's what it was back then.
Reply by Tim Williams December 13, 20112011-12-13
"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message 
news:jc6l0o$odi$1@reader1.panix.com...
>> Fine wires, usually of an obnoxious color, like blue, yellow, orange >> or, >> from literature, "scarlet". Used to jumper routing mistakes ;-) > > scarlet is as good as telcos calling grey/gray "slate".
Telco? You're not going back far enough. I meant as in the color of the "Scarlet Letter"!
> those wires are as funny as old computer boards complete with the > "spare" > sockets for ICs ready to be added at some later date. There still has to > be some silly name for this type of stuff past and "engineering change."
Comes in handy though. On one recent board, I implemented enough options that, for the forseeable future, a mere BOM change will cover all contingencies -- and when you, say, jumper a single SMT component that's DNI'd, you don't need any blue wire, just a short bit of bare wire will do. It was supposed to be that way...no one's the wiser. ;-) Contingencies also include cost reduction: I've already laid out replacements for the DC-DC modules ($$), it just has to be called out on the BOM. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
Reply by Cydrome Leader December 13, 20112011-12-13
In sci.electronics.design Tim Williams <tmoranwms@charter.net> wrote:
> "Cydrome Leader" <presence@MUNGEpanix.com> wrote in message > news:jc63og$na5$2@reader1.panix.com... >>> So, this part can be made to work, if Blue wires don't bother you till >>> the next board layout. >> >> haha, blue wires. Is there some corporate talk name for these that >> anybody >> has heard? > > Fine wires, usually of an obnoxious color, like blue, yellow, orange or, > from literature, "scarlet". Used to jumper routing mistakes ;-)
scarlet is as good as telcos calling grey/gray "slate". those wires are as funny as old computer boards complete with the "spare" sockets for ICs ready to be added at some later date. There still has to be some silly name for this type of stuff past and "engineering change."
Reply by linnix December 12, 20112011-12-12
On Dec 12, 7:13=A0pm, "Martin Riddle" <martin_...@verizon.net> wrote:
> "linnix" <m...@linnix.info-for.us> wrote in message > > news:ed841358-5bde-4a55-a9bf-372aa57eda19@f11g2000yql.googlegroups.com... > > > Gee Wee, the customer is not happy with 115K. =A0We already determined > > that TI's MAX232 works up to 115K and the MAX3232 won't even work at > > 115K (although it claims to work). =A0I know there are pin-incompatible > > MAX-something, but we don't want to change layout, just for the sake > > of in-compatibility. =A0Are there pin-compatible, reliable MAX232 clone=
s
> > for 230K that work, not just claim to work? =A0Thanks. > > Didn't look hard enough.... > <http://www.futureelectronics.com/en/technologies/semiconductors/signa...= > > > Worth a try. > > Cheers
OK, thanks. I'll give this a try.
Reply by Martin Riddle December 12, 20112011-12-12
"linnix" <me@linnix.info-for.us> wrote in message 
news:ed841358-5bde-4a55-a9bf-372aa57eda19@f11g2000yql.googlegroups.com...
> Gee Wee, the customer is not happy with 115K. We already determined > that TI's MAX232 works up to 115K and the MAX3232 won't even work at > 115K (although it claims to work). I know there are pin-incompatible > MAX-something, but we don't want to change layout, just for the sake > of in-compatibility. Are there pin-compatible, reliable MAX232 clones > for 230K that work, not just claim to work? Thanks.
Didn't look hard enough.... <http://www.futureelectronics.com/en/technologies/semiconductors/signal-interface/rs-232/Pages/8411480-SP3232EBCN-L-TR.aspx> Worth a try. Cheers