| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | DM74ALS257M | 3-STATE Quad 1-of-2-Line Data Selector/Multiplexer | 76K |
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| 2 | DM74ALS257M/A+ | 2-Input Digital Multiplexer | 115K |
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| 3 | DM74ALS257M/B+ | 2-Input Digital Multiplexer | 115K |
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| 4 | DM74ALS257MX | 2-Input Digital Multiplexer | 115K |
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