DS90LV031A
DS90LV031A 3V LVDS Quad CMOS Differential Line Driver
Literature Number: SNLS020B
DS90LV031A
October 27, 2010
3V LVDS Quad CMOS Differential Line Driver
General Description
The DS90LV031A is a quad CMOS differential line driver de-
signed for applications requiring ultra low power dissipation
and high data rates. The device is designed to support data
rates in excess of 400 Mbps (200 MHz) utilizing Low Voltage
Differential Signaling (LVDS) technology.
The DS90LV031A accepts low voltage LVTTL/LVCMOS in-
put levels and translates them to low voltage (350 mV) differ-
ential output signals. In addition the driver supports a TRI-
STATE® function that may be used to disable the output
stage, disabling the load current, and thus dropping the de-
vice to an ultra low idle power state of 13 mW typical.
The EN and EN* inputs allow active Low or active High control
of the TRI-STATE outputs. The enables are common to all
four drivers. The DS90LV031A and companion line receiver
(DS90LV032A) provide a new alternative to high power
psuedo-ECL devices for high speed point-to-point interface
applications.
Features
>400 Mbps (200 MHz) switching rates
0.1 ns typical differential skew
0.4 ns maximum differential skew
2.0 ns maximum propagation delay
3.3V power supply design
±350 mV differential signaling
Low power dissipation (13mW at 3.3V static)
Interoperable with existing 5V LVDS devices
Compatible with IEEE 1596.3 SCI LVDS standard
Compatible with TIA/EIA-644 LVDS standard
Industrial operating temperature range
Available in SOIC and TSSOP surface mount packaging
Connection Diagram
Dual-In-Line
10009501
Order Number DS90LV031ATM
or DS90LV031ATMTC
See NS Package Number M16A or MTC16
Functional Diagram
10009502
Truth Table
Enables Input Outputs
EN EN* DIN DOUT+ DOUT−
L H X Z Z
All other combinations of
ENABLE inputs
L L H
H H L
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 2010 National Semiconductor Corporation 100095 www.national.com
DS90LV031A 3V LVDS Quad CMOS Differential Line Driver
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (VCC)−0.3V to +4V
Input Voltage (DIN) −0.3V to (VCC + 0.3V)
Enable Input Voltage (EN, EN*) −0.3V to (VCC + 0.3V)
Output Voltage (DOUT+, DOUT−)−0.3V to +3.9V
Short Circuit Duration
(DOUT+, DOUT−)Continuous
Maximum Package Power Dissipation @ +25°C
M Package 1088 mW
MTC Package 866 mW
Derate M Package 8.5 mW/°C above +25°C
Derate MTC Package 6.9 mW/°C above +25°C
Storage Temperature Range −65°C to +150°C
Lead Temperature Range
Soldering (4 sec.) +260°C
Maximum Junction Temperature +150°C
ESD Rating (Note 10)
(HBM, 1.5 kΩ, 100 pF) 6 kV
Recommended Operating
Conditions
Min Typ Max Units
Supply Voltage (VCC) +3.0 +3.3 +3.6 V
Operating Free Air
Temperature (TA)
Industrial −40 +25 +85 °C
Electrical Characteristics
Over supply voltage and operating temperature ranges, unless otherwise specified. (Note 2, Note 3, Note 4)
Symbol Parameter Conditions Pin Min Typ Max Units
VOD1 Differential Output Voltage RL = 100Ω (Figure 1)DOUT−
DOUT+
250 350 450 mV
ΔVOD1 Change in Magnitude of VOD1 for
Complementary Output States
4 35 |mV|
VOS Offset Voltage 1.125 1.25 1.375 V
ΔVOS Change in Magnitude of VOS for
Complementary Output States
5 25 |mV|
VOH Output Voltage High 1.38 1.6 V
VOL Output Voltage Low 0.90 1.03 V
VIH Input Voltage High DIN, EN,
EN*
2.0 VCC V
VIL Input Voltage Low GND 0.8 V
IIH Input Current VIN = VCC or 2.5V −10 ±1 +10 μA
IIL Input Current VIN = GND or 0.4V −10 ±1 +10 μA
VCL Input Clamp Voltage ICL = −18 mA −1.5 −0.8 V
IOS Output Short Circuit Current ENABLED, (Note 11)
DIN = VCC, DOUT+ = 0V or
DIN = GND, DOUT− = 0V
DOUT−
DOUT+
−6.0 −9.0 mA
IOSD Differential Output Short Circuit
Current
ENABLED, VOD = 0V (Note 11) −6.0 −9.0 mA
IOFF Power-off Leakage VOUT = 0V or 3.6V,
VCC = 0V or Open
−20 ±1 +20 μA
IOZ Output TRI-STATE Current EN = 0.8V and EN* = 2.0V
VOUT = 0V or VCC
−10 ±1 +10 μA
ICC No Load Supply Current Drivers
Enabled
DIN = VCC or GND VCC 5.0 8.0 mA
ICCL Loaded Supply Current Drivers
Enabled
RL = 100Ω All Channels, DIN = VCC
or GND (all inputs)
23 30 mA
ICCZ No Load Supply Current Drivers
Disabled
DIN = VCC or GND,
EN = GND, EN* = VCC
2.6 6.0 mA
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DS90LV031A
Switching Characteristics - Industrial
VCC = +3.3V ±10%, TA = −40°C to +85°C (Note 3, Note 9, Note 12)
Symbol Parameter Conditions Min Typ Max Units
tPHLD Differential Propagation Delay High to Low RL = 100Ω, CL = 10 pF (Figure
2 and Figure 3)
0.8 1.18 2.0 ns
tPLHD Differential Propagation Delay Low to High 0.8 1.25 2.0 ns
tSKD1 Differential Pulse Skew |tPHLD − tPLHD| (Note 5) 0 0.07 0.4 ns
tSKD2 Channel-to-Channel Skew (Note 6) 0 0.1 0.5 ns
tSKD3 Differential Part to Part Skew (Note 7) 0 1.0 ns
tSKD4 Differential Part to Part Skew (Note 8) 0 1.2 ns
tTLH Rise Time 0.38 1.5 ns
tTHL Fall Time 0.40 1.5 ns
tPHZ Disable Time High to Z RL = 100Ω, CL = 10 pF (Figure
4 and Figure 5)
5 ns
tPLZ Disable Time Low to Z 5 ns
tPZH Enable Time Z to High 7 ns
tPZL Enable Time Z to Low 7 ns
fMAX Maximum Operating Frequency (Note 14) 200 250 MHz
Note 1: Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The table of “Electrical Characteristics” specifies conditions of device operation.
Note 2: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except: VOD1 and
ΔVOD1.
Note 3: All typicals are given for: VCC = +3.3V, TA = +25°C.
Note 4: The DS90LV031A is a current mode device and only functions within datasheet specifications when a resistive load is applied to the driver outputs typical
range is (90 to 110Ω)
Note 5: tSKD1, |tPHLD − tPLHD| is the magnitude difference in differential propagation delay time between the positive going edge and the negative going edge of
the same channel.
Note 6: tSKD2 is the Differential Channel-to-Channel Skew of any event on the same device.
Note 7: tSKD3, Differential Part to Part Skew, is defined as the difference between the minimum and maximum specified differential propagation delays. This
specification applies to devices at the same VCC and within 5°C of each other within the operating temperature range.
Note 8: tSKD4, part to part skew, is the differential channel-to-channel skew of any event between devices. This specification applies to devices over recommended
operating temperature and voltage ranges, and across process distribution. tSKD4 is defined as |Max − Min| differential propagation delay.
Note 9: Generator waveform for all tests unless otherwise specified: f = 1 MHz, ZO = 50Ω, tr 1 ns, and tf 1 ns.
Note 10: ESD Ratings:
HBM (1.5 kΩ, 100 pF) 6 kV
Note 11: Output short circuit current (IOS) is specified as magnitude only, minus sign indicates direction only.
Note 12: CL includes probe and jig capacitance.
Note 13: All input voltages are for one channel unless otherwise specified. Other inputs are set to GND.
Note 14: fMAX generator input conditions: tr = tf < 1ns, (0% to 100%), 50% duty cycle, 0V to 3V. Output Criteria: duty cycle = 45%/55%, VOD > 250mV, all channels
switching.
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DS90LV031A
Parameter Measurement Information
10009503
FIGURE 1. Driver VOD and VOS Test Circuit
10009504
FIGURE 2. Driver Propagation Delay and Transition Time Test Circuit
10009505
FIGURE 3. Driver Propagation Delay and Transition Time Waveforms
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DS90LV031A
10009506
FIGURE 4. Driver TRI-STATE Delay Test Circuit
10009507
FIGURE 5. Driver TRI-STATE Delay Waveform
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DS90LV031A
Applications Information
General application guidelines and hints for LVDS drivers and
receivers may be found in the following application notes:
LVDS Owner's Manual (lit #550062-001), AN808, AN1035,
AN977, AN971, AN916, AN805, AN903.
LVDS drivers and receivers are intended to be primarily used
in an uncomplicated point-to-point configuration as is shown
in Figure 7. This configuration provides a clean signaling en-
vironment for the quick edge rates of the drivers. The receiver
is connected to the driver through a balanced media which
may be a standard twisted pair cable, a parallel pair cable, or
simply PCB traces. Typically, the characteristic differential
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 a voltage that is detected by the receiver. Other configu-
rations 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 shift-
ing, noise margin limits, and total termination loading must be
taken into account.
The DS90LV031A differential line driver is a balanced current
source design. A current mode driver, generally speaking 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 output current is typically 3.5 mA, a minimum of 2.5 mA,
and a maximum of 4.5 mA. 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 7. AC or unterminated configurations are not allowed.
The 3.5 mA loop current will develop a differential voltage of
350 mV across the 100Ω termination resistor which the re-
ceiver detects with a 250 mV minimum differential noise
margin neglecting resistive line losses (driven signal minus
receiver threshold (350 mV – 100 mV = 250 mV)). The signal
is centered around +1.2V (Driver Offset, VOS) with respect to
ground as shown in Figure 6. Note that the steady-state volt-
age (VSS) peak-to-peak swing is twice the differential voltage
(VOD) and is typically 700 mV.
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 expo-
nentially in most case 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 ICC requirements
of the ECL/PECL designs. 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 TRI-STATE function allows the driver outputs to be dis-
abled, thus obtaining an even lower power state when the
transmission of data is not required.
The footprint of the DS90LV031A is the same as the industry
standard 26LS31 Quad Differential (RS-422) Driver and is a
step down replacement for the 5V DS90C031 Quad Driver.
Power Decoupling Recommendations:
Bypass capacitors must be used on power pins. High fre-
quency ceramic (surface mount is recommended) 0.1µF in
parallel with 0.01µF, in parallel with 0.001µF at the power
supply pin as well as scattered capacitors over the printed
circuit board. Multiple vias should be used to connect the de-
coupling capacitors to the power planes. A 10µF (35V) or
greater solid tantalum capacitor should be connected at the
power entry point on the printed circuit board.
PC Board considerations:
Use at least 4 PCB layers (top to bottom); LVDS signals,
ground, power, TTL signals.
Isolate TTL signals from LVDS signals, otherwise the TTL
may couple onto the LVDS lines. It is best to put TTL and
LVDS signals on different layers which are isolated by a pow-
er/ground plane(s).
Keep drivers and receivers as close to the (LVDS port side)
connectors as possible.
Differential Traces:
Use controlled impedance traces which match the differential
impedance of your transmission medium (ie. cable) and ter-
mination resistor. Run the differential pair trace lines as close
together as possible as soon as they leave the IC (stubs
should be < 10mm long). This will help eliminate reflections
and ensure noise is coupled as common-mode. Lab experi-
ments show that differential signals which are 1mm apart
radiate far less noise than traces 3mm apart since magnetic
field cancellation is greater with the closer traces. Plus, noise
induced on the differential lines is much more likely to appear
as common-mode which is rejected by the receiver.
Match electrical lengths between traces to reduce skew.
Skew between the signals of a pair means a phase difference
between signals which destroys the magnetic field cancella-
tion benefits of differential signals and EMI will result. (Note
the velocity of propagation, v = c/Er where c (the speed of
light) = 0.2997mm/ps or 0.0118 in/ps). Do not rely solely on
the auto-route function for differential traces. Carefully review
dimensions to match differential impedance and provide iso-
lation for the differential lines. Minimize the number of vias
and other discontinuities on the line.
Avoid 90° turns (these cause impedance discontinuities). Use
arcs or 45° bevels.
Within a pair of traces, the distance between the two traces
should be minimized to maintain common-mode rejection of
the receivers. On the printed circuit board, this distance
should remain constant to avoid discontinuities in differential
impedance. Minor violations at connection points are allow-
able.
Termination:
Use a resistor which best matches the differential impedance
of your transmission line. The resistor should be between
90 and 130. Remember that the current mode outputs
need the termination resistor to generate the differential volt-
age. LVDS will not work without resistor termination. Typical-
ly, connect a single resistor across the pair at the receiver end.
Surface mount 1% to 2% resistors are best. PCB stubs, com-
ponent lead, and the distance from the termination to the
receiver inputs should be minimized. The distance between
the termination resistor and the receiver should be < 10mm
(12mm MAX).
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DS90LV031A
Probing LVDS Transmission Lines:
Always use high impedance (> 100k), low capacitance
(< 2pF) scope probes with a wide bandwidth (1GHz) scope.
Improper probing will give deceiving results.
Cables and Connectors, General Comments:
When choosing cable and connectors for LVDS it is important
to remember:
Use controlled impedance media. The cables and connectors
you use should have a matched differential impedance of
about 100. They should not introduce major impedance dis-
continuities.
Balanced cables (e.g. twisted pair) are usually better than
unbalanced cables (ribbon cable, simple coax.) for noise re-
duction and signal quality. Balanced cables tend to generate
less EMI due to field canceling effects and also tend to pick
up electromagnetic radiation as common-mode (not differen-
tial mode) noise which is rejected by the receiver. For cable
distances < 0.5M, most cables can be made to work effec-
tively. For distances 0.5M d 10M, CAT 3 (category 3)
twisted pair cable works well, is readily available and relatively
inexpensive.
Fail-safe of an LVDS Interface
If the LVDS link as shown in Figure 7 needs to support the
case where the Line Driver is disabled, powered off, or re-
moved (un-plugged) and the Receiver device is powered on
and enabled, the state of the LVDS bus is unknown and
therefore the output state of the Receiver is also unknown. If
this is of concern, please consult the respective LVDS Re-
ceiver data sheet for guidance on Failafe Biasing options for
the LVDS interface to set a known state on the inputs for these
conditions.
10009509
FIGURE 6. Driver Output Levels
Typical Application
10009508
FIGURE 7. Point-to-Point Application
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DS90LV031A
Typical Performance Curves
10009510
FIGURE 8. Typical DS90LV031A, DOUT (single ended) vs RL, TA = 25°C
10009511
FIGURE 9. Typical DS90LV031A, DOUT vs RL,
VCC = 3.3V, TA = 25°C
Pin Descriptions
Pin No. Name Description
1, 7, 9, 15 DIN Driver input pin, TTL/CMOS compatible
2, 6, 10, 14 DOUT+ Non-inverting driver output pin, LVDS levels
3, 5, 11, 13 DOUT− Inverting driver output pin, LVDS levels
4 EN Active high enable pin, OR-ed with EN*
12 EN* Active low enable pin, OR-ed with EN
16 VCC Power supply pin, +3.3V ± 0.3V
8 GND Ground pin
Ordering Information
Package Package Order Number
Type Number
SOP M16A DS90LV031ATM
TSSOP MTC16 DS90LV031ATMTC
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DS90LV031A
Physical Dimensions inches (millimeters) unless otherwise noted
16-Lead (0.150″ Wide) Molded Small Outline Package, JEDEC
Order Number DS90LV031ATM
NS Package Number M16A
16-Lead (0.100″ Wide) Molded Thin Shrink Small Outline Package, JEDEC
Order Number DS90LV031ATMTC
NS Package Number MTC16
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DS90LV031A
Notes
DS90LV031A 3V LVDS Quad CMOS Differential Line Driver
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