| 制造商 | 部件名 | 数据表 | 功能描述 |
 National Semiconductor ... | DM74LS293 |  105Kb/6P | 4-Bit Binary Counter |
| DM74LS293M |  105Kb/6P | 4-Bit Binary Counter |
| DM74LS293N |  105Kb/6P | 4-Bit Binary Counter |
 National Semiconductor ... | DM74LS290 |  106Kb/4P | 4-BIR DECADE COUNTER |
| DM74LS290M |  106Kb/4P | 4-BIR DECADE COUNTER |
| DM74LS290N |  106Kb/4P | 4-BIR DECADE COUNTER |
| DM74LS293M |  105Kb/6P | 4-Bit Binary Counter |
| DM74LS293N |  105Kb/6P | 4-Bit Binary Counter |
| DM74LS295A |  117Kb/4P | 4-BIT SHIFT REGISTER WITH TRI-STATE OUTPUTS |
| DM74LS295AM |  117Kb/4P | 4-BIT SHIFT REGISTER WITH TRI-STATE OUTPUTS |
| DM74LS295AN |  117Kb/4P | 4-BIT SHIFT REGISTER WITH TRI-STATE OUTPUTS |
 National Semiconductor ... | DM74LS298 |  84Kb/3P | QUAD 2-PORT REGISTER MULTIPLEXER WITH STORAGE |
| DM74LS298M |  84Kb/3P | QUAD 2-PORT REGISTER MULTIPLEXER WITH STORAGE |
 National Semiconductor ... | DM74LS298N |  84Kb/3P | QUAD 2-PORT REGISTER MULTIPLEXER WITH STORAGE |
 National Semiconductor ... | DM74LS299N |  167Kb/8P | 8-Input Universal Shift/Storage Register with Common Parallel I/O Pins |
 National Semiconductor ... | DM74LS299WM |  167Kb/8P | 8-Input Universal Shift/Storage Register with Common Parallel I/O Pins |