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DESCRIPTION (CONTINUED)

SN65LVDS32B,, SN65LVDT32B

SN65LVDS3486B, SN65LVDT3486B

SN65LVDS9637B, SN65LVDT9637B

SLLS440B – OCTOBER 2000 – REVISED APRIL 2007

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Improved features include an input common-mode voltage range 2 V wider than the minimum required by the

standard. This will allow longer cable lengths by tripling the allowable ground noise tolerance to 3 V between a

driver and receiver. TI has additionally introduced an even wider input common-mode voltage range of –4 to 5 V

in their SN65LVDS/T33 and SN65LVDS/T34.

Precise control of the differential input voltage thresholds now allows for inclusion of 50 mV of input voltage

hysteresis to improve noise rejection on slowly changing input signals. The input thresholds are still no more

than ±50 mV over the full input common-mode voltage range.

The high-speed switching of LVDS signals almost always necessitates the use of a line impedance matching

resistor at the receiving-end of the cable or transmission media. The SN65LVDT series of receivers eliminates

this external resistor by integrating it with the receiver. The non-terminated SN65LVDS series is also available

for multidrop or other termination circuits.

The receivers can withstand ±15-kV human-body model (HBM) and ±600 V-machine model (MM) electrostatic

discharges to the receiver input pins with respect to ground without damage. This provides reliability in cabled

and other connections where potentially damaging noise is always a threat.

The receivers also include a (patent pending) fail-safe circuit that will provide a high-level output within 600 ns

after loss of the input signal. The most common causes of signal loss are disconnected cables, shorted lines, or

powered-down transmitters. This prevents noise from being received as valid data under these fault conditions.

This feature may also be used for wired-OR bus signaling.

The intended application of these devices and signaling technique is for point-to-point baseband data

transmission over controlled impedance media of approximately 100

Ω. The transmission media may be

printed-circuit board traces, backplanes, or cables. The ultimate rate and distance of data transfer is dependent

upon the attenuation characteristics of the media and the noise coupling to the environment.

The

SN65LVDS32B,

SN65LVDT32B,

SN65LVDS3486B,

SN65LVDT3486B,

SN65LVDS9637B,

and

SN65LVDT9637B are characterized for operation from –40°C to 85°C.

AVAILABLE OPTIONS

NUMBER OF

TERMINATION

SYMBOLIZATION

RECEIVERS

RESISTOR

SN65LVDS32BD

4

No

LVDS32B

SN65LVDT32BD

4

Yes

LVDT32B

SN65LVDS3486BD

4

No

LVDS3486

SN65LVDT3486BD

4

Yes

LVDT3486

SN65LVDS9637BD

2

No

DK637B

SN65LVDT9637BD

2

Yes

DR637B

(1)

Add the suffix R for taped and reeled carrier.

2

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