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快速PCB板设计技术.pdf

更新时间：2021-05-28 10:10:50 大小：1M 上传用户：Powerxys查看TA发布的资源 标签：pcb设计 下载积分：2分 评价赚积分 （如何评价?） 打赏 收藏 评论(0) 举报

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The most important factor in the design of many systems today is speed. 66-MHz thru 200-MHz

processors are common; 233 and 266-MHz processors are becoming readily available. The demand

for high speed results from: a) the requirement that systems perform complex tasks in a time frame

considered comfortable by humans; and b) the ability of component manufacturers to produce

high-speed devices. An example of a) is the large amount of information that must be processed

to perform even the most rudimentary computer animation. Currently, Programmable Array Logic

(PAL

®

) devices are available with propagation delays of 4.5 ns, and complex PLDs such as MACH

®

have propagation delays of 5 ns. While this might seem fast, it is not the propagation delay that

creates the potential for problems, but rather the fast edge rates needed to obtain the fast

propagation delays. In the future, much faster devices will become available, with correspondingly

faster edge rates.


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