A PLCC is just a case or package type.  It means
Plastic Leaded Chip Carrier, and generally comes in 
several rectangular styles.  The leads are J leads, that
is, each lead comes out and then bends under the package.
They may be soldered directly to the circuit board, OR
(big advantage) they may be inserted in a PLCC socket
which socket itself is soldered to the circuit board.
The leads have a .050 spacing, so are easier to work with
than some finer pitch packages.
The most common sizes are 14, 28, 32, 44, 48, 56, 84 pins.

Copy and paste the following into your browser Netsite windows
and it will bring up National Semiconductor's PLCC package specs.
Choose a package and see all the specs and a picture of the PLCC
product.

http://www.national.com/search/search.cgi/packaging?keywords=plcc

Regards,
  Ron Fial

--------------------------------------
At 01:09 PM 6/1/98 -0400, you wrote:
>        If some body please, can help me out I«d be very glad....
>
>
>        What«s the mean of PLCC PICs ?
>

Regards,
  Ron Fial