| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | CD74ACT191 | Presettable Synchronous 4-Bit Binary Up/Down Counter | 52K |
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| 2 | CD74ACT191 | Presettable Synchronous 4-Bit Binary Up/Down Counter | 52K |
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| 3 | CD74ACT191E | Presettable Synchronous 4-Bit Binary Up/Down Counter | 52K |
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| 4 | CD74ACT191E | Presettable Synchronous 4-Bit Binary Up/Down Counter | 52K |
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| 5 | CD74ACT191M | Presettable Synchronous 4-Bit Binary Up/Down Counter | 52K |
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| 6 | CD74ACT191M | Presettable Synchronous 4-Bit Binary Up/Down Counter | 52K |
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