Re: gEDA-user: selection quirk, and placement guidelines

[der Mouse <mouse@xxxxxxxxxxxxxxxxxxxxxx>]

> I has been a *really* long time since I used a DIP socket, but I want
> to say you can't place them any closer than 100 mils between pins,
> and I'm not sure you can get them that close.

It depends on the sockets.  To an extent, it also depends on the chips.

> A lot of headers are designed to be "stacked" end to end and form a
> continuous 100 mil spacing of pins.  But I want to say you can't
> necessarily do that with DIP sockets.

You can't _necessarily_.  But there are sockets that are designed to be
stacked end-to-end (that is, pins 1 and N of one socket next to pins
N/2 and (N/2)+1 of the next).  I've never tried stacking them sideways
(1 and N/2 of one next to N and (N/2)+1 of the next), but based on
memory of the sockets I have (they're at home and I'm not), I'm fairly
sure at least some sockets would do that just fine.

As for "depends on the chips" - I've seen some chips whose cases extend
far enough that you can't stack them end-to-end with only 100 mil
spacing regardless of the sockets.  200 mil is fine; 150 mil would
probably work, but I have't tried it.  But I've also seen other chips
whose cases end right at the edge of the operational portion of the
pin; they can be stacked substantially closer than 100 mils end-to-end.
And I've never seen a DIP with anything mechanically preventing
side-to-side 100-mil stacking (which is not to say no such exist).

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