Differential Input (Version 2)

Applies to Closed3621 Coaxlink Mono CXP-12, 3621-LH Coaxlink Mono CXP-12 LH, 3622 Coaxlink Duo CXP-12, 3622-LH Coaxlink Duo CXP-12 LH, 3625 Coaxlink QSFP+ and 3618 HD26F I/O Extension Module - Fast I/O.

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     150   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:

Relative V+/V- voltageLogical State
V+ > V-HIGH
V+ < V-LOW
Unconnected inputUnknown

Compatible drivers

The following drivers are compatible with the high-speed differential input ports:

RS-422/RS-485 differential line drivers
Complementary TTL drivers