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MOSIS Technical Notes
PGA Socket and Board
Unfortunately we do not have a "standard" recommended test fixture
because there are almost an infinite number of possible
implementations. We generally assume that designers have already
implemented some sort of test fixture to test the device. MOSIS
specifically uses industry standard packages to reduce the difficulty
of constructing a test fixture either in a commercial test set or on a
benchtop test.
The 84 Pin PGA has pins are on a standard 0.1" pitch. It will fit into
any PGA socket that has at least 84 pins. It is not necessary to have
a socket that is specifically 84 pins to allow you to construct a test
board. Several socket manufacturers make ZIF sockets for PGA devices
that have the entire area of the socket populated with connections
(e.g., AMP Type 916503-1, a 168 pin ZIF socket). Take a look in any
major electronic parts distributor catalog like Newark Electronics or
Digi-Key or Allied. ZIF sockets make it easier to insert and remove
devices that you are testing as opposed to a one time insertion for an
application. However, ZIF sockets cost more than standard sockets.
You can build a simple test fixture by soldering a socket into a board
and run wires to terminals inserted and soldered elsewhere on the
board. Vector Electronics Co. makes perforated prototype boards with
0.1" pitch plated through solder pads in every hole (see the Digi-Key
catalog).
Prototyping is such a broad subject that there is no single simple
solution that we can have on the ready for our customers. Prototyping
is one of those areas where you can exercise your creativity.
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