TIA-644-A:2001 (R2012)

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Electrical Characteristics of Low Voltage Differential Signaling (LVDS) Interface Circuits

Published By	Publication Date	Number of Pages
TIA	2001	42

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Category: TIA

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Description

This Standard specifies the electrical characteristics of low
voltage differential signaling interface circuits, normally
implemented in integrated circuit technology, that may be employed
when specified for the interchange of binary signals between:

Data Terminal Equipment (DTE) and Data Circuit-Terminating
Equipment (DCE),

Data Terminal Equipment (DTE) and Data Terminal Equipment
(DTE),

or in any point-to-point, or multidrop interconnection of binary
signals between equipment.

The interface circuit includes a generator connected by a
balanced interconnecting media to a load consisting of a
termination impedance and a receiver(s). The interface
configuration is a point-to-point or multidrop interface. The
electrical characteristics of the circuit are specified in terms of
required voltage, and current values obtained from direct
measurements of the generator and receiver (load) components at the
interface points.

The logic function of the generator and the receiver is not
defined by this Standard, as it is application dependent. The
generators and receivers may be inverting, non-inverting, or may
include other digital blocks such as parallel-to-serial or
serial-to-parallel converters to boost the data signaling rate on
the interchange circuit as required by the application.

Minimum performance requirements for the balanced
interconnecting media are furnished. Guidance is given in Annex A,
Section A.2 with respect to limitations on data signaling rate
imposed by the parameters of the cable length, attenuation, and
crosstalk for individual installations for a typical cable media
interface.

It is intended that this Standard will be referenced by other
standards that specify the complete interface (i.e., connector, pin
assignments, function) for applications where the electrical
characteristics of a low voltage differential signaling interface
circuit is required. This Standard does not specify other
characteristics of the DTE-DCE interface (such as signal quality,
protocol, maximum data signaling rate, bus structure, and/or
timing) essential for proper operation across the interface.

When this Standard is referenced by other standards or
specifications, it should be noted that certain options are
available. The preparer of those standards and specifications must
determine and specify those optional features which are required
for that application.

Additional information