On Thu, 20 Jun 2002 16:49:43 +0100, Alan B. Pearce wrote:
>>7$ for a 84 pin PLD (clear logic) translates to
>>about 8c per output. About double than
>>using 595 shift registers.
>
>>Is it so ? Any cheaper alternative ?
>
>Do not forget to factor in assembly costs, which will be
>significant for
>that number of 595 devices, and could soon get you to the
>programmed/assembled PLD cost.

And also PCB real estate area too. A 10mm or 14mm 100pin TQFP
takes up a whole lot less PCB area than the multitude of '595 SO
devices you'll need. There are lots of factors in the "true cost"
of a design, besides Bill of Material cost (which people many
times forget).

Matt Pobursky
Maximum Performance Systems

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