| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | 54F191SCX |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
 National Semiconductor ... | 54F191SCQB |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191SJCQB |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191SJCX |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191SJMQB |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191SJMX |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191SMQB |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191SMX |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191DCQB |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191DCX |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191DM |  196Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191DMQB |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191DMX |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191FCQB |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191FCX |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191FM |  196Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191FMQB |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191FMX |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191LCQB |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |
| 54F191LCX |  175Kb/10P | Up/Down Binary Counter with Preset and Ripple Clock |