Datasheet
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DESCRIPTION (CONTINUED)
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R
IN1–
R
IN1+
R
IN2+
R
IN2–
R
IN3–
R
IN3+
R
IN4+
R
IN4–
EN
R
OUT1
R
OUT2
V
CC
GND
R
OUT3
R
OUT4
EN
SN65LVDS348, SN65LVDT348
D or PW PACKAGE
(TOP VIEW)
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1A
1B
2A
2B
EN 1,2
V
CCA
AGND
EN 3,4
3A
3B
4A
4B
NC
1Y
DGND1
V
CCD1
2Y
NC
NC
3Y
V
CCD2
DGND2
4Y
NC
SN65LVDS352, SN65LVDT352
PW PACKAGE
(TOP VIEW)
NC – No internal connection
SN65LVDS348 , SN65LVDT348
SN65LVDS352 , SN65LVDT352
SLLS523E – FEBRUARY 2002 – REVISED MAY 2004
Precise control of the differential input voltage thresholds allows for inclusion of 50 mV of input-voltage
hysteresis to improve noise rejection. The differential input thresholds are still no more than ±50 mV over the full
input common-mode voltage range.
The receiver inputs can withstand ±15 kV human-body model (HBM), 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) failsafe circuit that provides a high-level output approximately 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 SN65LVDT348 and SN65LVDT352 include an integrated termination resistor. This reduces board space
requirements and parts count by eliminating the need for a separate termination resistor. This can also improve
signal integrity at the receiver by reducing the stub length from the line termination to the receiver.
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 SN65LVDS348, SN65LVDT348, SN65LVDS352 and SN65LVDT352 are characterized for operation from
-40°C to 85°C.
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