Yes pins 1 & 8 are power for both a 555 and a 12C508 (at least the DIP
package). However, I think the power pins are flipped...

555 has +5 on pin 8 (referenced to pin 1)
12C508 has +5 on on pin 1 (referenced to pin 8)

I suppose you could put a 12C508 on the BOTTOM of the board. This would
align the power pins properly (assuming a DIP package). May or may not be
true for other packages.

-- Mark

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of Peter
> Sent: Friday, March 31, 2006 1:20 PM
> To: Microcontroller discussion list - Public.
> Subject: RE: [EE]: looking for retriggerable 555 monostable circuit
>
>
>
>
> On Thu, 30 Mar 2006 peiserma@ridgid.com wrote:
>
> > piclist-bounces@mit.edu wrote:
> >> The problem is that I'm trying to fix a circuit that's
> >> already been committed to PCB with the least ugly kludge
> >> possible.
> >
> > That makes it more interesting. Do you have the bare PCB, or is the
> > board already assembled? I don't suppose the 555 is a DIP package? If it
> > is, then one possibility would be building a "daughter board" that plugs
> > into where the 555 goes.
> >
> > A wild thought: If there exists a small 8-pin micro (PIC or otherwise)
> > with Vdd and Vss on the same pins as the 555, you could swap that in.
> > Assuming its a 5V circuit.
>
> 12C508
>
> Peter
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