DS89C21 и другие
| Компонент | Описание | Производитель | |
| DS89C21 | Differential CMOS Line Driver and Receiver Pair |
National Semiconductor |
 |
| DS89C21TM | Differential CMOS Line Driver and Receiver Pair |
National Semiconductor |
|
| DS89C21TMX | Differential CMOS Line Driver and Receiver Pair |
National Semiconductor |
|