| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | CD54ACT191 | Presettable Synchronous 4-Bit Binary Up/Down Counter | 62K |
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| 2 | CD54ACT191 | Presettable Synchronous 4-Bit Binary Up/Down Counters | 19K |
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| 3 | CD54ACT1913A | Presettable Synchronous 4-Bit Binary Up/Down Counters | 19K |
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| 4 | CD54ACT191F3A | Presettable Synchronous 4-Bit Binary Up/Down Counter | 62K |
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