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PLCC-P21


Dear MISC readers,

This is a message from Dr. Ting at Offete with information about a
new PLCC P21.

Date: Wed, 02 Aug 95 14:16:41 PDT
From: "TingCH" <TingCH@ccmail.apldbio.com>
Subject: MuP21 in new PLCC package

New Product Annoucement

MuP21 Now Available in 44-Pin PLCC Package


Dear Forth Engines User:

A batch of the MuP21 dies were sent to Phillipines and packaged into the 44-pin 
PLCC (Platic Leaded Chip Carriers), and are now available for sale.  The 
product code is MuP21h.  Single unit price is $40.  Consult Offete for volume 
pricing.

MuP21 was prototyped by Orbit Semiconductor, using their very low cost 
Foresight Process.  The prototype chips were packaged in 40 pin ceramic DIP 
carrier.  Hence the production chips were packaged in 40-pin plastic DIP 
packages.  The DIP packages are inexpensive, but are bulky and limited the 
performance of MuP21.  The PLCC package is smaller (11/16" square) with a 
footprint about 1/3 of the DIP package.  It can be surface-mounted to a printed 
circuit board.

The pin-out of MuP21h in the PLCC package is:

1  NC       12 NC       23 NC       34 NC
2  D0       13 A9       24 Vss      35 DA18
3  D1       14 A8       25 CAS      36 DA17
4  D2       15 A7       26 RAS      37 DA16
5  D3       16 A6       27 WE       38 DA15
6  D4       17 A5       28 SRAM     39 DA14
7  D5       18 A4       29 IO       40 DA13
8  D6       19 A3       30 VIDEO    41 DA12
9  D7       20 A2       31 RESET    42 DA11
10 D8       21 A1       32 14M      43 DA10
11 D9       22 A0       33 DA19     44 Vdd

MuP21 in PLCC package works much better than that in the DIP packages.  
However, we have not had the time and the proper eauipment to fully 
characterize its performance.  We are in the process of laying out a new PC 
board for more testing.  The smaller size of PLCC will make the board more 
compact and more attractive.  If you have a serious application for MuP21, you 
should consider using MuP21h.

If you have any questions, let me know.

Dr. C. H. Ting.