| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | 74LVC257AD | Quad 2-input multiplexer with 5 Volt tolerant inputs/outputs 3-State | 99K |
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| 2 | 74LVC257ADB | Quad 2-input multiplexer with 5 Volt tolerant inputs/outputs 3-State | 99K |
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| 3 | 74LVC257ADB-T | 2-Input Digital Multiplexer | 370K |
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| 4 | 74LVC257AD-T | 2-Input Digital Multiplexer | 370K |
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