| Manufacturer | Part Number | Description |
|---|---|---|
| RTD | DM7820HR | Versatile High Speed Digital I/O |
| RTD | DM7820 | Versatile High Speed Digital I/O |
National Semiconductor (now Texas Instruments) |
DM7820 | dual line receiver |
|
National Semiconductor (now Texas Instruments) |
DM7820A | dual line receiver |
