| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | CD74HC251E | High Speed CMOS Logic 8-Input Multiplexer; Three-State | 38K |
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| 2 | CD74HC251E | High-Speed CMOS Logic 8-Input Multiplexer, Three-State | 278K |
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| 3 | CD74HC251EN | Logic IC | 583K |
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