Differential Input (Version 2)

Applies to 3621 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.

3621 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+ 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.	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- voltage	Logical State
V+ > V-	HIGH
V+ < V-	LOW
Unconnected input	Unknown

Compatible drivers

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

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RS-422/RS-485 differential line drivers

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Complementary TTL drivers