ds90lv049h National Semiconductor Corporation, ds90lv049h Datasheet - Page 9

• Manufacturer Part Number: ds90lv049h
• Description: High Temperature 3v Lvds Dual Line Driver And Receiver Pair
• Manufacturer: National Semiconductor Corporation

Applications Information
The receiver’s internal fail-safe circuitry is designed to
source/sink a small amount of current, providing fail-safe
protection (a stable known state of HIGH output voltage) for
floating receiver inputs.
The DS90LV049H has two receivers, and if an application
requires a single receiver, the unused receiver inputs should
be left OPEN. Do not tie unused receiver inputs to ground or
any other voltages. The input is biased by internal high value
pull up and pull down current sources to set the output to a
HIGH state. This internal circuitry will guarantee a HIGH,
stable output state for open inputs.
Pin Descriptions
Typical Performance Curves
Differential Output Voltage
Pin No.
10, 11
14, 15
9, 16
6, 7
5, 8
2, 3
1, 4
12
13
vs Load Resistor
EN, EN
D
D
Name
R
GND
R
R
V
D
OUT+
OUT−
OUT
IN+
DD
IN-
IN
Driver input pins, LVCMOS levels. There is a pull-down current
source present.
Non-inverting driver output pins, LVDS levels.
Inverting driver output pins, LVDS levels.
Non-inverting receiver input pins, LVDS levels. There is a pull-up
current source present.
Inverting receiver input pins, LVDS levels. There is a pull-down
current source present.
Receiver output pins, LVCMOS levels.
Enable and Disable pins. There are pull-down current sources
present at both pins.
Power supply pin.
Ground pin.
(Continued)
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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 5 kΩ to 15 kΩ range to minimize loading and
waveform distortion to the driver. The common-mode bias
point should be set to approximately 1.2 V (less than 1.75 V)
to be compatible with the internal circuitry.
For more information on failsfe biasing of LVDS interfaces
please refer to AN-1194.
Description
Power Supply Current
vs Frequency
20161721
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