| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | IN74AC257D | Quad 2-Input Date Selector/Multiplexer with 3-State Outputs High-Speed Silicon-Gate CMOS | 151K |
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| 2 | IN74AC257D | Quad 2-Input Data Selector/Multiplexer with 3-State Outputs High-Speed Silicon-Gate CMOS | 204K |
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