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Subject: Re: what do these mean ?
X-Newsreader: Microsoft Outlook Express 5.00.2919.6700
Date: Wed, 20 Nov 2002 07:18:50 GMT
NNTP-Posting-Date: Wed, 20 Nov 2002 07:18:50 GMT
Organization: AT&T Worldnet
From their Website ::
The Legend for most of the package diagrams in the data book
contain a parameter "BSC". What does this abreviation stand
BSC Represents theoretical exact dimension or dimension target.
BSC is short for "BASIC" or "Basic Space between Center." It is a
numerical value used to describe the theoretical exact size, shape
or location of a feature or datum target. It is the basis from which
permissible variations are established by tolerances on other
dimensions, in notes or by feature control symbols.
Basic dimensions are shown on the drawing enclosed in a rectangle.
Ref. (short for Reference) is also shown by some dimensions of
package drawings. These reference callouts state the nominal
dimensions normally without tolerance.
PLC is Programmable Logic Cell
"Anand" wrote in message
> I think this may appear silly to a lot of people but I don't know the
> meaning of these abbreviations that I came across on a Plastic Leaded
> Chip Carrier PLCC part description page on the XILINX website .
> The package being PLCC-44.
> PLCS : ?
> BSC : ?
> please do reply
> thanks very much
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