| 制造商 | 部件名 | 数据表 | 功能描述 |
 National Semiconductor ... | DM74LS249 |  103Kb/6P | BCD to 7-Segment Decoder with Open-Collector Outputs |
| DM74LS249N |  103Kb/6P | BCD to 7-Segment Decoder with Open-Collector Outputs |
 National Semiconductor ... | DM74LS240 |  102Kb/ 3P | Octal TRI-STATE Buffers/Line Drivers/Line Receivers |
| DM74LS240N |  142Kb/ 6P | Octal TRI-STATE Buffers/Line Drivers/Line Receivers |
 National Semiconductor ... | DM74LS240N |  102Kb/ 3P | Octal TRI-STATE Buffers/Line Drivers/Line Receivers |
 National Semiconductor ... | DM74LS240WM |  142Kb/ 6P | Octal TRI-STATE Buffers/Line Drivers/Line Receivers |
 National Semiconductor ... | DM74LS241 |  142Kb/ 6P | Octal TRI-STATE Buffers/Line Drivers/Line Receivers |
 National Semiconductor ... | DM74LS241 |  102Kb/ 3P | Octal TRI-STATE Buffers/Line Drivers/Line Receivers |
| DM74LS241N |  142Kb/ 6P | Octal TRI-STATE Buffers/Line Drivers/Line Receivers |
 National Semiconductor ... | DM74LS241N |  102Kb/ 3P | Octal TRI-STATE Buffers/Line Drivers/Line Receivers |
| DM74LS241WM |  142Kb/ 6P | Octal TRI-STATE Buffers/Line Drivers/Line Receivers |