| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | M74HC590TTR | 8 BINARY COUNTER REGISTER WITH 3 STATE OUTPUT | 1050K |
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| 2 | M74HC590TTR | 8 BINARY COUNTER REGISTER WITH 3 STATE OUTPUT | 1050K |
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| 3 | M74HC590TTR | 8 BINARY COUNTER REGISTER WITH 3 STATE OUTPUT | 1043K |
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