| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | 74ABT16821ADL | 20-bit bus-interface D-type flip-flop; positive-edge trigger 3-State | 82K |
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| 2 | 74ABT16821ADL | 20-bit bus-interface D-type flip-flop; positive-edge trigger; 3-state | 156K |
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| 3 | 74ABT16821ADL-T | 20-Bit D-Type Flip-Flop | 430K |
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