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序号 型号 描述 大小 厂家Logo 下载
1 DM74LS221M Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs 111K FAIRCHILD 4225187
2 DM74LS221M Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs 146K NSC 2095968
3 DM74LS221MX Monostable Multivibrator 111K FAIRCHILD 3552624