Differential Input
Specification of the differential GPIO input ports
Differential Input Simplified Schematic
The receiver complies with the ANSI/TIA/EIA-422B specification.
DC Characteristics
| Parameter | Conditions | Min. | Typ. | Max. | Units |
|---|---|---|---|---|---|
| Common mode voltage | -7 | +7 | V | ||
| Differential sensitivity | 200 | mV | |||
| Input impedance | 120 | Ohm | |||
| ESD protection | Human Body Model (HBM) | 15 | kV | ||
| Contact discharge | 8 | kV | |||
| Air gap discharge | 15 | kV |
AC characteristics
| Parameter | Min. | Typ. | Max. | Units |
|---|---|---|---|---|
| Pulse width | 100 | ns | ||
| Pulse rate | 0 | 5 | MHz | |
| 10%-90% rise/fall time | 1 | µs |
Logical map
The state of the port is reported as follows:
| Differential Input voltage | Logical State |
|---|---|
| (VIN+ - VIN-) > +200 mV | HIGH |
| (VIN+ - VIN-) < - 200 mV | LOW |
| Unconnected input | HIGH |
Compatible drivers and receivers
The following drivers are compatible with the high-speed differential input ports:
| ● | ANSI/EIA/TIA-422/485 differential line drivers |
| ● | Complementary TTL drivers |