| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | 74HCT191D | Presettable synchronous 4-bit binary up/down counter | 110K |
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| 2 | 74HCT191DB | Presettable synchronous 4-bit binary up/down counter | 110K |
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| 3 | 74HCT191D-T | Synchronous Up/Down Counter | 243K |
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