On Tue, Dec 16, 2003 at 09:59:22AM -0800, Martin McCormick enlightened
us thusly
> "Brad O'Dell" writes:
> >Actually, you might want to use a 7416 which is rated for 15V, or a
> >7406 which is rated for 30V. The 7417 and 7407 are the non-inverting
> >versions of these. The 7405 is only rated for 7V absolute maximum.
>
> Thank you! Somehow, I had it that the 7405 would handle the
> 12-V potential on the collector. I'll rethink that part of the
> design. I ran in to a problem a few days ago with my PIC
> programmer so the project is on hold for a brief period of time
> anyway. I'll probably just buy a pile of 7406's and 7407's the
> next time I order from Jameco since it sounds like those would
> be good things to have around when one wants to interface
> TTL-logic levels to higher voltages. In this circuit, for
> example, there will be 10-K pull-up resisters to 12 volts and
> the open collectors will short them to ground when they need to
> go low.
>
On your PIC problems.
There was a significant software revision from Microchip (version 6.0
IIRC) which immediately bellyflopped in some way so the upgrade should
be to 6.10 of MPLAB.
This required an internal firmware upgrade to version 3.0 (which
bellyflopped) so use 3.10 or higher. If you use picp to program it under
linux, you need version 0.5 or better.
These upgrades were to handle things like the 18xxx series chips, the
16f877a etc. My info is 2 years old so more bugfix releases may have
occurred since then with the windows software.
--
With best Regards,
Declan Moriarty.
--
Author: Declan Moriarty
INET: [EMAIL PROTECTED]
Fat City Network Services -- 858-538-5051 http://www.fatcity.com
San Diego, California -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB CHIPDIR-L
(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
