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1 - Al Kossow's Bitsavers

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Area Savings with PLCCThe pe board area savings that can be realized with thePLee is best demonstrated by a comparison of two TexasInstruments one· megabyte memory boards (see Figure 4).The DIP board is eight layers, measuring 279,4 rom(11 inches) by 355,6 nim (14 inches) with 226 les. ThePLee board is four layers, measuring 165,1 rom (6.5 inches)by 243,84 mm (9.6 inches) also with 226 les. The savingsthat can be realized with the PLee board amounts to 60%less board area at an overall cost savings of approximately55 %. This illustrates the viability of surface mount as a lowcost means of improving circuit board density while reducingpe layout complexity.Figure 4. PLCC and DIP One Megabyte Menwry Expansion Boardsco'';:;mE ...o .....CtilCo'';:;m,2C.Co

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