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DS90LV048A Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. DS90LV048A
Description  3V LVDS Quad CMOS Differential Line Receiver
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DS90LV048A Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Applications Information (Continued)
2.
Terminated Input. If the driver is disconnected (cable
unplugged), or if the driver is in a TRI-STATE or power-
off condition, the receiver output will again be in a HIGH
state, even with the end of cable 100
Ω termination resis-
tor across the input pins. The unplugged cable can be-
come a floating antenna which can pick up noise. If the
cable picks up more than 10mV of differential noise, the
receiver may see the noise as a valid signal and switch.
To insure that any noise is seen as common-mode and
not differential, a balanced interconnect should be used.
Twisted pair cable will offer better balance than flat rib-
bon cable.
3.
Shorted Inputs. If a fault condition occurs that shorts
the receiver inputs together, thus resulting in a 0V differ-
ential input voltage, the receiver output will remain in a
HIGH state. Shorted input fail-safe is not supported
across the common-mode range of the device (GND to
2.4V). It is only supported with inputs shorted and no ex-
ternal common-mode voltage applied.
External lower value pull up and pull down resistors (for a
stronger bias) may be used to boost fail-safe in the presence
of higher noise levels. The pull up and pull down resistors
should be in the 5k
Ω to 15kΩ range to minimize loading and
waveform distortion to the driver. The common-mode bias
point should be set to approximately 1.2V (less than 1.75V)
to be compatible with the internal circuitry.
Pin Descriptions
Pin No.
Name
Description
2, 3, 6, 7
R
IN+
Non-inverting receiver input pin
1, 4, 5, 8
R
IN−
Inverting receiver input pin
10, 11, 14,
R
OUT
Receiver output pin
15
16
EN
Receiver enable pin: When EN is
low, the receiver is disabled.
When EN is high and EN* is low
or open, the receiver is enabled.
If both EN and EN* are open
circuit, then the receiver is
disabled.
9
EN*
Receiver enable pin: When EN*
is high, the receiver is disabled.
When EN* is low or open and
EN is high, the receiver is
enabled. If both EN and EN* are
open circuit, then the receiver is
disabled.
13
V
CC
Power supply pin, +3.3V ± 0.3V
12
GND
Ground pin
Ordering Information
Operating
Package Type/
Order Number
Temperature
Number
−40˚C to +85˚C
SOP/M16A
DS90LV048ATM
−40˚C to +85˚C
TSSOP/MTC16
DS90LV048ATMTC
Typical Performance Curves
Output High Voltage vs
Power Supply Voltage
DS100888-12
Output Low Voltage vs
Power Supply Voltage
DS100888-13
www.national.com
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