| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | M74HC191 | 4 BIT SYNCHRONOUS UP/DOWN COUNTERS | 306K |
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| 2 | M74HC191_01 | 4 BIT SYNCHRONOUS UP/DOWN COUNTERS | 580K |
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| 3 | M74HC191B1R | 4 BIT SYNCHRONOUS UP/DOWN COUNTERS | 306K |
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| 4 | M74HC191B1R | 4 BIT SYNCHRONOUS UP/DOWN COUNTERS | 580K |
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| 5 | M74HC191C1R | 4 BIT SYNCHRONOUS UP/DOWN COUNTERS | 306K |
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| 6 | M74HC191F1R | 4 BIT SYNCHRONOUS UP/DOWN COUNTERS | 306K |
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| 7 | M74HC191M1R | 4 BIT SYNCHRONOUS UP/DOWN COUNTERS | 306K |
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| 8 | M74HC191M1R | 4 BIT SYNCHRONOUS UP/DOWN COUNTERS | 580K |
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| 9 | M74HC191RM13TR | 4 BIT SYNCHRONOUS UP/DOWN COUNTERS | 580K |
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| 10 | M74HC191TTR | 4 BIT SYNCHRONOUS UP/DOWN COUNTERS | 580K |
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