| 制造商 | 部件名 | 数据表 | 功能描述 |
 National Semiconductor ... | DM74LS192 |  172Kb/8P | 54LS192/DM74LS192 Up/Down Decade Counter with Separate Up/Down Clocks |
| DM74LS192M |  172Kb/8P | 54LS192/DM74LS192 Up/Down Decade Counter with Separate Up/Down Clocks |
| DM74LS192N |  172Kb/8P | 54LS192/DM74LS192 Up/Down Decade Counter with Separate Up/Down Clocks |
 National Semiconductor ... | DM74LS190 |  174Kb/8P | Synchronous 4-Bit Up/Down Counters with Mode Control |
| DM74LS190M |  174Kb/8P | Synchronous 4-Bit Up/Down Counters with Mode Control |
| DM74LS190N |  174Kb/8P | Synchronous 4-Bit Up/Down Counters with Mode Control |
 National Semiconductor ... | DM74LS191 |  174Kb/8P | Synchronous 4-Bit Up/Down Counters with Mode Control |
 National Semiconductor ... | DM74LS191M |  174Kb/8P | Synchronous 4-Bit Up/Down Counters with Mode Control |
 National Semiconductor ... | DM74LS191N |  174Kb/8P | Synchronous 4-Bit Up/Down Counters with Mode Control |
| DM74LS192M |  172Kb/8P | 54LS192/DM74LS192 Up/Down Decade Counter with Separate Up/Down Clocks |
| DM74LS192N |  172Kb/8P | 54LS192/DM74LS192 Up/Down Decade Counter with Separate Up/Down Clocks |