| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | 74F191SC | Up/Down Binary Counter with Preset and Ripple Clock | 78K |
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| 2 | 74F191SC | Up/Down Binary Counter with Preset and Ripple Clock | 201K |
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| 3 | 74F191SC | Up/Down Binary Counter with Preset and Ripple Clock | 190K |
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| 4 | 74F191SCQB | Up/Down Binary Counter with Preset and Ripple Clock | 179K |
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| 5 | 74F191SCX | Synchronous Up/Down Counter | 100K |
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| 6 | 74F191SCX | Up/Down Binary Counter with Preset and Ripple Clock | 179K |
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