| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | 54AC191 | Up/Down Counter with Preset and Ripple Clock | 213K |
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| 2 | 54AC191D | Up/Down Counter with Preset and Ripple Clock | 213K |
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| 3 | 54AC191DMQB | Asynchronous Up/Down Counter | 228K |
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| 4 | 54AC191F | Up/Down Counter with Preset and Ripple Clock | 213K |
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| 5 | 54AC191L | Up/Down Counter with Preset and Ripple Clock | 213K |
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| 6 | 54AC191LMQB | Asynchronous Up/Down Counter | 228K |
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