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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Sockets for TSOP 64
Date: Sat, 14 Sep 2002 01:01:29 GMT
NNTP-Posting-Date: Fri, 13 Sep 2002 18:01:29 PDT
I think the package is called TSOP 64. It has about 20 mil pin pitch and
the pins are on two sides of the package instead of all around. These
are flash parts and our programmer has a Yamaichi socket that releases
by pressing down (the pins are clamped from above by the contacts) and
our development board (which cannot do programming) has a Yamaichi clam
shell type socket (the pins are contacted from below).
We have successfully used similar sockets to the first type with parts
having up to 100 pins and the second type works well for us in a 128 pin
model and a 208 pin model. We are not able to get reliable operation
with either socket for more than a minute or two with the flash parts.
That is, it can take 5 or 10 reseating attempts to get a part to program
and then we move it to the development board and it is hit or miss
whether the board will boot. The board itself is OK because it runs
perfectly from soldered down SRAM loaded through a JTAG interface.
Unfortunately, it is not in our plan ever to solder down the flash on
the development boards (we theoretically can program flash through an
ATAPI interface but we don't have anyone to develop host side drivers to
do it). Thus we have to have removable flash in our lab and we have to
distribute preprogrammed flash parts to customers with development
boards even though they have JTAG load capability at some stations in
Are there better sockets for these parts? We have a solution in mind but
which is slightly ugly and a bit expensive (price is not a huge concern
given the development boards are cost the earth anyway).
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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