| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | DS9638CM |  199Kb/6P | RS-422 Dual High Speed Differential Line Driver |
 National Semiconductor ... | DS9638CN |  199Kb/6P | RS-422 Dual High Speed Differential Line Driver |
 National Semiconductor ... | DS9638MJ/883 |  199Kb/6P | RS-422 Dual High Speed Differential Line Driver |
 National Semiconductor ... | DS9636 |  139Kb/6P | RS-423 Dual Programmable Slew Rate Line Driver |
| DS9636A |  139Kb/6P | RS-423 Dual Programmable Slew Rate Line Driver |
| DS9636A |  139Kb/6P | RS-423 Dual Programmable Slew Rate Line Driver |
| DS9636ACN |  139Kb/6P | RS-423 Dual Programmable Slew Rate Line Driver |
| DS9636AJ/883 |  139Kb/6P | RS-423 Dual Programmable Slew Rate Line Driver |
| DS9637A |  142Kb/6P | Dual Differential Line Receiver |