| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | P89C557E4 | Single-chip 8-bit microcontroller | 383K |
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| 2 | P89C557E4 | Single-chip 8-bit microcontroller | 383K |
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| 3 | P89C557E4EBB | Single-chip 8-bit microcontroller | 383K |
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| 4 | P89C557E4EBB | Single-chip 8-bit microcontroller | 383K |
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| 5 | P89C557E4EFB | Single-chip 8-bit microcontroller | 383K |
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| 6 | P89C557E4EFB | Single-chip 8-bit microcontroller | 383K |
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