| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | SN54HC191 | 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS | 160K |
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| 2 | SN54HC191FK | 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS | 160K |
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| 3 | SN54HC191J | 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS | 160K |
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| 4 | SN54HC191J | 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS | 484K |
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| 5 | SN54HC191W | 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS | 160K |
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