| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | DM74LS503 | 8-Bit Successive Approximation Register (with Expansion Control) | 46K |
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| 2 | DM74LS503N | 8-Bit Successive Approximation Register (with Expansion Control) | 46K |
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| 3 | DM74LS503WM | Successive-Approximation Register | 122K |
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