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