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High speed (230K) RS232 drivers?

Started by linnix December 10, 2011
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.
"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.
Max 3222 ?
On Dec 10, 9:00=A0am, "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. =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. > > Max 3222 ?
18 pins vs. 16 pins
On Dec 10, 9:19=A0am, linnix <m...@linnix.info-for.us> wrote:
> On Dec 10, 9:00=A0am, "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. =A0We already determine=
d
> > > 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-incompatib=
le
> > > MAX-something, but we don't want to change layout, just for the sake > > > of in-compatibility. =A0Are there pin-compatible, reliable MAX232 clo=
nes
> > > for 230K that work, not just claim to work? =A0Thanks. > > > Max 3222 ? > > 18 pins vs. 16 pins
Actually, worst than that. 20 pins TSSOP vs. 16 pins TSSOP Not even TSSOP 18 available.
linnix wrote:
> 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.
230 kbps is getting into RS422 territory... -- Les Cargill
On Dec 10, 10:32=A0am, Les Cargill <lcargil...@comcast.com> wrote:
> linnix wrote: > > 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. > > 230 kbps is getting into RS422 territory...
Yes, i know. I told me he's crazy (behind his back), but he didn't listen. Anyway, we can keep the cable as short as possible (couple inches), but the interface has to be RS232.
linnix wrote:
> On Dec 10, 10:32 am, Les Cargill<lcargil...@comcast.com> wrote: >> linnix wrote: >>> 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. >> >> 230 kbps is getting into RS422 territory... > > Yes, i know. I told me he's crazy (behind his back), but he didn't > listen.
Did you try "But Captain, I canna change the laws a' physics!!!" ? > Anyway, we can keep the cable as short as possible (couple
> inches), but the interface has to be RS232.
<http://www.amazon.com/StarTech-RS-232-Serial-Converter-IC485S/dp/B000067SMC/ref=pd_sim_e_2> -- Les Cargill
On Dec 10, 12:12=A0pm, Les Cargill <lcargil...@comcast.com> wrote:
> linnix wrote: > > On Dec 10, 10:32 am, Les Cargill<lcargil...@comcast.com> =A0wrote: > >> linnix wrote: > >>> Gee Wee, the customer is not happy with 115K. =A0We already determine=
d
> >>> 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-incompatib=
le
> >>> MAX-something, but we don't want to change layout, just for the sake > >>> of in-compatibility. =A0Are there pin-compatible, reliable MAX232 clo=
nes
> >>> for 230K that work, not just claim to work? =A0Thanks. > > >> 230 kbps is getting into RS422 territory... > > > Yes, i know. =A0I told me he's crazy (behind his back), but he didn't > > listen. > > Did you try "But Captain, I canna change the laws a' physics!!!" ?
Scotty, PC claims to do 921K, we can certainly do 1/4 of that. Just do your magic. Scotty to Spot: Can't believe everything they say, can you?
On a sunny day (Sat, 10 Dec 2011 10:33:40 -0800 (PST)) it happened linnix
<me@linnix.info-for.us> wrote in
<674b572e-993c-4a41-82ec-769302adf6f9@y18g2000yqy.googlegroups.com>:

>On Dec 10, 10:32&#2013266080;am, Les Cargill <lcargil...@comcast.com> wrote: >> linnix wrote: >> > Gee Wee, the customer is not happy with 115K. &#2013266080;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). &#2013266080;I know there are pin-incompatible >> > MAX-something, but we don't want to change layout, just for the sake >> > of in-compatibility. &#2013266080;Are there pin-compatible, reliable MAX232 clone= >s >> > for 230K that work, not just claim to work? &#2013266080;Thanks. >> >> 230 kbps is getting into RS422 territory... > >Yes, i know. I told me he's crazy (behind his back), but he didn't >listen. Anyway, we can keep the cable as short as possible (couple >inches), but the interface has to be RS232.
You have probably thought of that, but there exists low capacitance cable. That may make a LOT of difference.
On Dec 10, 12:46=A0pm, Jan Panteltje <pNaonStpealm...@yahoo.com> wrote:
> On a sunny day (Sat, 10 Dec 2011 10:33:40 -0800 (PST)) it happened linnix > <m...@linnix.info-for.us> wrote in > <674b572e-993c-4a41-82ec-769302adf...@y18g2000yqy.googlegroups.com>: > > >On Dec 10, 10:32=A0am, Les Cargill <lcargil...@comcast.com> wrote: > >> linnix wrote: > >> > Gee Wee, the customer is not happy with 115K. =A0We already determin=
ed
> >> > 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-incompati=
ble
> >> > MAX-something, but we don't want to change layout, just for the sake > >> > of in-compatibility. =A0Are there pin-compatible, reliable MAX232 cl=
one=3D
> >s > >> > for 230K that work, not just claim to work? =A0Thanks. > > >> 230 kbps is getting into RS422 territory... > > >Yes, i know. =A0I told me he's crazy (behind his back), but he didn't > >listen. =A0Anyway, we can keep the cable as short as possible (couple > >inches), but the interface has to be RS232. > > You have probably thought of that, but there exists low capacitance cable=
.
> That may make a LOT of difference.
Keeping the line as short as possible will probably be the same. However, the driver chip itself needs to be fast enough.