| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | KK74HC257A | Quad 2-Input Data Selector/Multiplexer with 3-State Outputs High-Performance Silicon-Gate CMOS | 231K |
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| 2 | KK74HC257AD | Quad 2-Input Data Selector/Multiplexer with 3-State Outputs High-Performance Silicon-Gate CMOS | 231K |
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| 3 | KK74HC257AN | Quad 2-Input Data Selector/Multiplexer with 3-State Outputs High-Performance Silicon-Gate CMOS | 231K |
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