Re: Was Chip carrier now sockets

[steve ravet <sravet@arm.com>]

Bruce Plecan wrote:
> 
> What exactly are you doing / making?.
> I'm lost here
> Grumpy

The 1227748 ECM is a P4, but uses a bare socket and one of those black
plastic clips, like a 747, instead of a memcal, like the other P4s. 
It's also a 28 pin socket instead of a 24 like the 747.  On a 747 you
can remove the funny GM socket and put in a ZIF, but on the 748 the
holes are .475 inches apart rather than .6 inches, so a regular socket
won't fit.  Steve is making a little PC board with holes at .475 and
.6", as an adapter, so you can put a regular socket in.  Seems like they
might only be useful for the 1227748, though.

--steve

> 
> > Hmm, with out measuring my 7747, I had some spare in^2 on some PCBs I was
> > having made, so I made some 0.6" to 0.4" and 0.5" adaptors.  As you know,
> > my 7747s don't need them :-)  As long as I was doing it, I put a pad for a
> > 1206 surface mount deglitching cap and a power LED (to warn you not to
> > pull the chip w/ led on).  Now I see that the real dimension is 0.475.
> > Well, I'll have 24 of these boards show up tomorrow, and I won't need any.
> > Could you use some?  I even bought some MilMax type spacers to go from the
> > origional socket holes to the adaptor.  I'll have some space on another
> > PCB this week, so I might make some more of the correct spacing.    Since
> > I don't need them, I guess I'll offer the rese to the list.
> >
> > - Steven Ciciora
> 
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-- 
Steve Ravet
steve.ravet@arm.com
ARM,Inc.
www.arm.com
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