| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | CD54HC257F | Logic IC | 583K |
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| 2 | CD54HC257F3A | High-Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs | 282K |
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| 3 | CD54HC257F3A | High-Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs | 282K |
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