| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | PI74FCT2191T | High Speed CMOS Presettable Synchronous 4-Bit Binary Counters | 225K |
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| 2 | PI74FCT2191TQ | Synchronous Up/Down Counter | 266K |
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| 3 | PI74FCT2191TS | Synchronous Up/Down Counter | 266K |
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