Two quick RS-485 questions

Joe Legris <jalegris@xympatico.ca> writes:

> While were talking about prices, what's the best choice (i.e. cheap)
> for a MAX232 equivalent that the uses 0.1 uF caps?

Best I found was ST232CW or (TI) MAX232D for ~$0.50 for ~50
pcs. (Would be interested in others).


-- 

John Devereux

In article <u8yg4ldui.fsf@plastech-controls.com>, jd1@devereux.me.uk 
says...
> Joe Legris <jalegris@xympatico.ca> writes:
> 
> > While were talking about prices, what's the best choice (i.e. cheap)
> > for a MAX232 equivalent that the uses 0.1 uF caps?
> 
> Best I found was ST232CW or (TI) MAX232D for ~$0.50 for ~50
> pcs. (Would be interested in others).
> 
> 
> 
Sipex SP232ECP, last buy was ~$0.53 each.

On 4 May 2004 05:23:12 -0700, larwe@larwe.com (Lewin A.R.W. Edwards) wrote:

>> > > BTW, the driver/receiver I'm using is the SN75LBC179P, which is $1.26
>> > 
>> > That is indeed cheaper than the Maxim counterpart.
>> 
>> Cheapest is probably a generic 75176, e.g.  DS75176BM or SN75176AD, ~ $0.20
>
>There is some reason why I chose this particular part, but I didn't
>make a note of it. (I have a half-page of scratch paper with part
>numbers on it, most of which are crossed out). Well, anyhoo, I'm about
>$30 per unit under budget for the entire appliance, which is great
>heaping bowls full of meaty gravy, and there is much rejoicing.

For some further information about RS485, check out this app note.
It describes 10 ways to "bullet proof" RS485 interfaces.

http://www.national.com/an/AN/AN-1057.pdf

Regards
David Milne