| 制造商 | 部件名 | 数据表 | 功能描述 |
 National Semiconductor ... | DM74LS221 |  142Kb/6P | Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs |
 National Semiconductor ... | DM74LS221M |  142Kb/6P | Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs |
 National Semiconductor ... | DM74LS221N |  142Kb/6P | Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs |
 National Semiconductor ... | DM74LS221M |  142Kb/6P | Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs |
 National Semiconductor ... | DM74LS221N |  142Kb/6P | Dual Non-Retriggerable One-Shot with Clear and Complementary Outputs |
 National Semiconductor ... | DM74LS22M |  50Kb/3P | DUAL 4-INPUT NAND GATE (WITH OPEN-COLLECTOR OUTPUT) |
| DM74LS22N |  50Kb/3P | DUAL 4-INPUT NAND GATE (WITH OPEN-COLLECTOR OUTPUT) |
 National Semiconductor ... | DM74LS20M |  124Kb/6P | Dual 4-Input NAND Gates |
 National Semiconductor ... | DM74LS20N |  124Kb/6P | Dual 4-Input NAND Gates |