Compatible with ANSI/TIA/EIA 644-1996 LVDS Standard
INTRODUCTION
The UT54LVDS031 Quad Driver is a quad CMOS differential
line driver designed for applications requiring ultra low power
dissipation and high data rates. The device is designed to support
data rates in excess of 155.5 Mbps (77.7 MHz) utilizing Low
Voltage Differential Signaling (LVDS) technology.
The UT54LVDS031 accepts TTL input levels and translates
them to low voltage (340mV) differential output signals. In
addition, the driver supports a three-state function that may be
used to disable the output stage, disabling the load current, and
thus dropping the device to an ultra low idle power state.
The UT54LVDS031 and companion quad line receiver
UT54LVDS032 provide new alternatives to high power pseudo-
ECL devices for high speed point-to-point interface
applications.
D
IN1
D
OUT1+
D1
D
OUT1-
D
IN2
D
OUT2+
D2
D
OUT2-
D
OUT3+
D3
D
OUT3-
D
OUT4+
D4
D
OUT4-
D
IN3
D
IN4
EN
EN
Figure 1. UT54LVDS031 Quad Driver Block Diagram
1
APPLICATIONS INFORMATION
The UT54LVDS031 driver’s intended use is primarily in an
uncomplicated point-to-point configuration as is shown in
Figure 3. This configuration provides a clean signaling
environment for quick edge rates of the drivers. The receiver is
connected to the driver through a balanced media such as a
standard twisted pair cable, a parallel pair cable, or simply PCB
traces. Typically, the characteristic impedance of the media is in
the range of 100Ω. A termination resistor of 100Ω should be
selected to match the media and is located as close to the receiver
input pins as possible. The termination resistor converts the
current sourced by the driver into voltages that are detected by
the receiver. Other configurations are possible such as a multi-
receiver configuration, but the effects of a mid-stream
connector(s), cable stub(s), and other impedance discontinuities,
as well as ground shifting, noise margin limits, and total
termination loading must be taken into account.
D
IN1
D
OUT1+
D
OUT1-
EN
D
OUT2-
D
OUT2+
D
IN2
V
SS
1
2
3
4
5
6
7
8
UT54LVDS031
Driver
16
15
14
13
12
11
10
9
V
DD
D
IN4
D
OUT4+
D
OUT4-
EN
D
OUT3-
D
OUT3+
D
IN3
Figure 2. UT54LVDS031 Pinout
TRUTH TABLE
Enables
EN
L
EN
H
Input
D
IN
X
L
H
Z
L
H
Output
D
OUT+
D
OUT-
Z
H
L
DATA
INPUT
ENABLE
RT 100Ω
1/4 UT54LVDS032
+
-
DATA
OUTPUT
1/4 UT54LVDS031
All other combinations
of ENABLE inputs
PIN DESCRIPTION
Pin No.
1, 7, 9, 15
2, 6, 10, 14
3, 5, 11, 13
4
12
16
8
Name
D
IN
D
OUT+
D
OUT-
EN
EN
V
DD
V
SS
Figure 3. Point-to-Point Application
Description
Driver input pin, TTL/CMOS
compatible
Non-inverting driver output pin,
LVDS levels
Inverting driver output pin,
LVDS levels
Active high enable pin, OR-ed
with EN
Active low enable pin, OR-ed
with EN
Power supply pin, +5V + 10%
Ground pin
The UT54LVDS031 differential line driver is a balanced current
source design. A current mode driver, has a high output
impedance and supplies a constant current for a range of loads
(a voltage mode driver on the other hand supplies a constant
voltage for a range of loads). Current is switched through the
load in one direction to produce a logic state and in the other
direction to produce the other logic state. The current mode
requires
(as discussed above) that a resistive termination be
employed to terminate the signal and to complete the loop as
shown in Figure 3. AC or unterminated configurations are not
allowed. The 3.4mA loop current will develop a differential
voltage of 340mV across the 100Ω termination resistor which
the receiver detects with a 240mV minimum differential noise
margin neglecting resistive line losses (driven signal minus
receiver threshold (340mV - 100mV = 240mV)). The signal is
centered around +1.2V (Driver Offset, V
OS
) with respect to
ground as shown in Figure 4.
Note:
The steady-state voltage
(V
SS
) peak-to-peak swing is twice the differential voltage (V
OD
)
and is typically 680mV.
2
3V
D
IN
D
OUT-
SINGLE-ENDED
D
OUT+
V
0D
0V
V
OH
V
OS
V
OL
+V
OD
0V (DIFF.)
0V
-V
OD
D
OUT+
- D
OUT-
DIFFERENTIAL OUTPUT
Note: The footprint of the UT54LVDS031 is the same as the in-
dustry standard Quad Differential (RS-422) Driver.
V
SS
The current mode driver provides substantial benefits over
voltage mode drivers, such as an RS-422 driver. Its quiescent
current remains relatively flat versus switching frequency.
Whereas the RS-422 voltage mode driver increases
exponentially in most cases between 20 MHz - 50 MHz. This is
due to the overlap current that flows between the rails of the
device when the internal gates switch. Whereas the current mode
driver switches a fixed current between its output without any
substantial overlap current. This is similar to some ECL and
PECL devices, but without the heavy static I
CC
requirements of
the ECL/PECL design. LVDS requires 80% less current than
similar PECL devices. AC specifications for the driver are a
tenfold improvement over other existing RS-422 drivers.
The Three-State function allows the driver outputs to be
disabled, thus obtaining an even lower power state when the
transmission of data is not required.
Figure 4. Driver Output Levels
3
OPERATIONAL ENVIRONMENT
PARAMETER
Total Ionizing Dose (TID)
Single Event Latchup (SEL)
Neutron Fluence
1
Notes:
1. Guarnteed but not tested.
LIMIT
1.0E6
>100
1.0E13
UNITS
rad(Si)
MeV-cm
2
/mg
n/cm
2
ABSOLUTE MAXIMUM RATINGS
1
(Referenced to V
SS
)
SYMBOL
V
DD
V
I/O
T
STG
P
D
T
J
Θ
JC
I
I
PARAMETER
DC supply voltage
Voltage on any pin
Storage temperature
Maximum power dissipation
Maximum junction temperature
2
Thermal resistance, junction-to-case
3
DC input current
LIMITS
-0.3 to 6.0V
-0.3 to (V
DD
+ 0.3V)
-65 to +150°C
1.25 W
+150°C
10°C/W
±
10mA
Notes:
1. Stresses outside the listed absolute maximum ratings may cause permanent damage to the device. This is a stress rating only, and functional operation of the device
at these or any other conditions beyond limits indicated in the operational sections of this specification is not recommended. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability and performance.
2. Maximum junction temperature may be increased to +175°C during burn-in and steady-static life.
3. Test per MIL-STD-883, Method 1012.
RECOMMENDED OPERATING CONDITIONS
SYMBOL
V
DD
T
C
V
IN
PARAMETER
Positive supply voltage
Case temperature range
DC input voltage
LIMITS
4.5 to 5.5V
-55 to +125°C
0V to V
DD
4
DC ELECTRICAL CHARACTERISTICS*
1, 2
(V
DD
= 5.0V +10%; -55°C < T
C
< +125°C); Unless otherwise noted, Tc is per the temperature range ordered
SYMBOL
V
IH
V
IL
V
OL
V
OH
I
IN4
V
OD1
ΔV
OD1
V
OS
ΔV
OS
V
CL3
I
OS3
I
OZ4
I
CCL4
I
CCZ4
PARAMETER
High-level input voltage
Low-level input voltage
Low-level output voltage
High-level output voltage
Input leakage current
Differential Output Voltage
Change in Magnitude of V
OD
for
Complementary Output States
Offset Voltage
(TTL)
(TTL)
R
L
= 100Ω
R
L
= 100Ω
V
IN
= V
DD
R
L
= 100Ω
(figure 5)
R
L
= 100Ω
(figure 5)
Voh + Vol
-
R
L
= 100Ω,
⎛
Vos = --------------------------
⎞
⎝
⎠
2
CONDITION
MIN
2.0
V
SS
0.90
MAX
V
DD
0.8
UNIT
V
V
V
1.60
-10
250
+10
400
10
1.125
1.375
V
μA
mV
mV
V
Change in Magnitude of V
OS
for
Complementary Output States
Input clamp voltage
Output Short Circuit Current
Output Three-State Current
R
L
= 100Ω
(figure 5)
I
CL
= -18mA
V
OUT
= 0V
2
EN = 0.8V and EN = 2.0 V,
V
OUT
= 0V or V
DD
R
L
= 100Ω all channels
V
IN
= V
DD
or V
SS
(all inputs)
D
IN
= V
DD
or V
SS
EN = V
SS
, EN = V
DD
-10
25
-1.5
5.0
+10
mV
V
mA
μΑ
Loaded supply current drivers
enabled
Loaded supply current drivers
disabled
mA
25.0
mA
10.0
Notes:
* For devices procured with a total ionizing dose tolerance guarantee, the post-irradiation performance is guaranteed at 25
o
C per MIL-STD-883 Method 1019, Condition
A up to the maximum TID level procured.
1. Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except differential voltages.
2. Output short circuit current (I
OS
) is specified as magnitude only, minus sign indicates direction only.
[font=Courier]At the beginning of 2008, the automotive electronics industry reviewed the development of 2007 and raised some thought-provoking questions. Local automotive electronics companies will fa...
[i=s]This post was last edited by paulhyde on 2014-9-15 09:08[/i] I looked at the component list for 2003 and there was a high-frequency varactor diode, and the topic for that year was a voltage-contr...
For a single-port circuit without independent source, which has two lead-out terminals, has no independent power supply inside and the current on the two terminals is the same, it is called a single-p...
2021 is a new start. This year, the electronics industry faces new challenges, both in terms of physical and economic aspects.
In general, more consumption and boosting the economy can better serve th...
Project requirements:Develop a redundant disk array card with 4 SATA hard disks based on Xilinx Kintex7 325T, and communicate with the PC through the PCIe 2.0 X8 interface. See the attachedSATA3.0 int...
The mass production process of the new generation of cockpit platform has started, and the smart cockpit market has entered a new bonus cycle of technology iteration and platform upgrade.
...[Details]
On August 21st, Zhiyuan Robotics revealed at its first partner conference that it expects shipments to reach thousands of units this year and tens of thousands next year. The company hopes to reach...[Details]
According to foreign media reports, Ford Motor has applied to the U.S. Patent and Social Security Office (USPTO) for a patent for a door anti-collision system that may be used in future Ford vehicl...[Details]
Wearable technology is taking off, with applications evolving rapidly, from smartwatches to fitness trackers and even smart wigs! Bluetooth Smart is at the center of this revolution. This is the se...[Details]
The composition of the water heater
The water heater itself is divided into the following parts:
1. Water tank.
This is where the water heater is filled with water and where the wate...[Details]
1. Introduction
In 2015, Apple's new MacBook and Apple Watch both featured force-sensing technology, which Apple calls Force Touch. Each time a user presses the touchpad, the device not only p...[Details]
On August 20, Huawei Device announced that the all-new M7 is the first to feature an in-cabin laser vision solution. This solution offers enhanced active safety capabilities compared to primary vis...[Details]
The Waveshare ESP32-P4-ETH is a compact ESP32-P4 development board with Ethernet and PoE support. It looks very similar to the Olimex ESP32-P4-DevKit, minus the pUEXT connector. However, we've also...[Details]
As in-vehicle audio and video entertainment features become increasingly diverse, the demand for digital transmission of audio and video information is urgent. Traditional protocols such as IEEE 13...[Details]
Let’s first take a look at the development concept of the EVD series.
The EVD control module is specially developed for operation in extreme environments. Components that meet these requiremen...[Details]
Currently, PLCs are widely used in various industries, including special machine tools, machine tools, control systems, building automation, steel, petrochemicals, electricity, building materials, ...[Details]
August 18, 2025—
Advantech, a global leader in IoT intelligent systems and embedded platforms, today announced a collaboration with LitePoint, a global provider of wireless test solutions, to d...[Details]
When we use electric cars on the highway, we do need to pay attention to more aspects than fuel cars.
First, we need to charge our electric vehicles in advance. Compared to fuel vehicles...[Details]
The number of new energy vehicles in use is increasing, and there are multiple choices available. New energy vehicles can be divided into hybrid and pure electric, and the types of hybrid include m...[Details]
Bosch, an "old money" company, is radical in its investment in new technologies.
Bosch announced at this year's Technology Day that it will invest more than 2.5 billion euros (about 21.1...[Details]
Automotive Electronics
京公网安备 11010802033920号
EEWORLD
