| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | CD54HCT4020F3A | High-Speed CMOS Logic 14-Stage Binary Counter | 270K |
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| 2 | CD54HCT4020F3A | High-Speed CMOS Logic 14-Stage Binary Counter | 270K |
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| 3 | CD54HCT4020F3A | High-Speed CMOS Logic 14-Stage Binary Counter | 276K |
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