| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | SN74LS221NSRE4 | DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS | 636K |
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| 2 | SN74LS221NSRE4 | DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS | 780K |
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| 3 | SN74LS221NSRE4 | DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS | 633K |
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