most of the time, pin compatible means that
所在版块:求学狮城 发贴时间:2005-04-01 01:23  评分:

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can be used interchangeably.

But there are exceptions. 74Cxx chips are CMOS versions of 74xx series, they are pin compatible. But CMOS input doesn't need a biasing current, while TTL (BJT) needs. Circuit built for 74Cxx chips may have problem with 74xx, if not carefully designed.
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