| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | SN74ALS191A | SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS | 136K |
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| 2 | SN74ALS191AD | SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS | 136K |
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| 3 | SN74ALS191AN | SYNCHRONOUS 4-BIT UP/DOWN BINARY COUNTERS | 136K |
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