| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | 74HCT221 | Dual non-retriggerable monostable multivibrator with reset | 256K |
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| 2 | 74HCT221D | Dual non-retriggerable monostable multivibrator with reset | 256K |
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| 3 | 74HCT221D-T | Monostable Multivibrator | 343K |
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| 4 | 74HCT221N | Dual non-retriggerable monostable multivibrator with reset | 256K |
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