| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | SN74HC191N | 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS | 160K |
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| 2 | SN74HC191N | 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS | 484K |
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| 3 | SN74HC191N3 | 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS | 484K |
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| 4 | SN74HC191NE4 | 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS | 484K |
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| 5 | SN74HC191NSR | 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS | 484K |
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| 6 | SN74HC191NSRE4 | 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS | 484K |
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