Royce Simmons wrote:
> Hi,
>
> Anyone knpw of a source for ZIP sockets for thr F84, F628 and F876 PICs?  I
> checked
> DigiKey, Jameco and a few others but I could not find anything.

The only real tricky thing is that nobody seems to make narrow 28-pin
ZIF sockets. There are, however, the "universal" ones that can accept
both wide and narrow DIPs; they'll do just fine if you have enough space
on your board for them. Suitable sockets for the 876 would include the
Aries sockets (Digi-Key A441-ND or A442-ND; the latter is gold-plated),
or the more expensive TexTool Double DIP sockets (3M2806-ND). The only
option they have for an 18-pin socket is from TexTool: 3M1802-ND.

Given the expense of ZIF sockets, it might be better to design a more
clever circuit that could switch the signals to appropriate pins, and
use a single socket that could handle any size of PIC. (Most commercial
chip programmers use that method.) The 40-pin A445-ND or A446-ND would
be good choices for that sort of design, or you could go with the 48-pin
versions (A-447ND or A-448ND) if you want to be able to handle non-PIC
parts that come in that size of socket.

These sockets are all the kind with a big flip lever, typically used in
chip programmers and prototype boards. There are also lower-profile ZIF
sockets that are sometimes used in production hardware, when you want to
be able to easily replace the chip. None of the catalogs I have list any
suitable sockets of that type (18-pin or narrow 28-pin); only wide
sockets in various sizes from 24 to 40 pins seem to be available. But
there isn't much point to that type of socket when you're using a flash
programmable part; designing an ICSP interface into your board is far
less expensive.

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