| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 31 | MC74HC390D | Dual 4-Stage Binary Ripple Counter with ±2 and ±5 Sections | 221K |
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| 32 | MC74HC390N | Dual 4-Stage Binary Ripple Counter with ±2 and ±5 Sections | 221K |
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| 33 | MC74HC390N | Dual 4-Stage Binary Ripple Counter with ±2 and ±5 Sections | 221K |
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| 34 | MC74HC390N | Dual 4-Stage Binary Ripple Counter with ±2and ±5 Sections | 221K |
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