FEATURES
q>155.5 Mbps (77.7 MHz) switching rates
q+340mV nominal differential signaling
q5 V power supply
qCold Spare LVDS outputs
qTTL compatible inputs
qUltra low power CMOS technology
q5.0ns maximum, propagation delay
q3.0ns maximum, differential skew
qRadiation-hardened design; total dose irradiation testing to
MIL-STD-883 Method 1019
- Total-dose: 300 krad(Si)
- Latchup immune (LET > 111 MeV-cm2/mg)
qPackaging options:
- 16-lead flatpack (dual in-line)
qStandard Microcircuit Drawing 5962-95833
- QML Q and V compliant part
qCompatible with IEEE 1596.3SCI LVDS
qCompatible with ANSI/TIA/EIA 644-1996 LVDS Standard
INTRODUCTION
The UT54LVDSC031 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 UT54LVDSC031 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 UT54LVDSC031 and companion quad line receiver
UT54LVDSC032 provide new alternatives to high power
pseudo-ECL devices for high speed point-to-point interface
applications.
All LVDS pins have Cold Spare buffers. These buffers will
be high impedance when VDD is tied to VSS.
D1
D2
D3
D4
DOUT1+
DOUT1-
DOUT2+
DOUT2-
DOUT3+
DOUT3-
DOUT4+
DOUT4-
DIN1
DIN2
DIN4
DIN3
EN
EN
Standard Products
UT54LVDSC031 Quad Driver
Data Sheet April 2, 2001
Figure 1. UT54LVDSC031 Quad Driver Block Diagram
2
TRUTH TABLE
PIN DESCRIPTION
APPLICATIONS INFORMATION
The UT54LVDSC031 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.
The UT54LVDSC031 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, VOS) with respect to
ground as shown in Figure 4. Note: The steady-state voltage
(VSS) peak-to-peak swing is twice the differential voltage (VOD)
and is typically 680mV.
Enables Input Output
EN EN DIN DOUT+ DOUT-
LH X Z Z
All other combinations
of ENABLE inputs L L H
H H L
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
4EN Active high enable pin, OR-ed
with EN
12 EN Active low enable pin, OR-ed
with EN
16 VDD Power supply pin, +5V + 10%
8VSS Ground pin
Figure 2. UT54LVDSC031 Pinout
UT54LVDSC031
Driver
16
15
14
13
12
11
10
9
VDD
DIN4
DOUT4+
DOUT4-
EN
DOUT3-
DOUT3+
DIN3
1
DIN1
2DOUT1+ 3
DOUT1-
4EN 5
DOUT2- 6
DOUT2+ 7
DIN2
8
VSS
ENABLE
DATA
INPUT
1/4 UT54LVDSC031
1/4 UT54LVDSC031
+
-DATA
OUTPUT
Figure 3. Point-to-Point Application
RT 100Ω
3
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 ICC 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.
DIN
DOUT-
DOUT+
SINGLE-ENDED
DOUT+ - DOUT-
DIFFERENTIAL OUTPUT
V0D
3V
0V
VOH
VOS
VOL
+VOD
-VOD
0V
0V (DIFF.) VSS
Figure 4. Driver Output Levels
Note: The footprint of the UT54LVDSC031 is the same as the
industry standard Quad Differential (RS-422) Driver.
4
ABSOLUTE MAXIMUM RATINGS1
(Referenced to VSS)
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 PARAMETER LIMITS
VDD DC supply voltage -0.3 to 6.0V
VI/O Voltage on any pin -0.3 to (VDD + 0.3V)
TSTG Storage temperature -65 to +150°C
PDMaximum power dissipation 1.25 W
TJMaximum junction temperature2+150°C
ΘJC Thermal resistance, junction-to-case310°C/W
IIDC input current ±10mA
SYMBOL PARAMETER LIMITS
VDD Positive supply voltage 4.5 to 5.5V
TCCase temperature range -55 to +125°C
VIN DC input voltage 0V to VDD
5
DC ELECTRICAL CHARACTERISTICS1, 2
(VDD = 5.0V +10%; -55°C < TC < +125°C)
Notes:
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 (IOS) is specified as magnitude only, minus sign indicates direction only.
3. Guaranteed by characterization.
4. Devices are tested @ VDD = 5.5V only.
SYMBOL PARAMETER CONDITION MIN MAX UNIT
VIH High-level input voltage (TTL) 2.0 VDD V
VIL Low-level input voltage (TTL) VSS 0.8V
VOLLow-level output voltage RL = 100Ω0.90 V
VOH High-level output voltage RL = 100Ω1.60 V
IIN4Input leakage current VIN = VDD -10 +10 µA
ICSOUT Cold Spare Leakage LVDS Outputs VIN=5.5V, VDD=VSS -10 +10 µΑ
VOD1Differential Output Voltage RL = 100Ω(figure 5) 250 400 mV
∆VOD1Change in Magnitude of VOD for
Complementary Output States RL = 100Ω(figure 5) 10 mV
VOS Offset Voltage RL = 100Ω, 1.125 1.375 V
∆VOS Change in Magnitude of VOS for
Complementary Output States RL = 100Ω(figure 5) 25 mV
VCL3Input clamp voltage ICL = -18mA -1.5 V
IOS3Output Short Circuit Current VOUT = 0V25.0 mA
IOZ4Output Three-State Current EN = 0.8V and EN = 2.0 V,
VOUT = 0V or VDD
-10 +10 µΑ
ICCL4Loaded supply current drivers
enabled RL = 100Ω all channels
VIN = VDD or VSS(all inputs) 25.0 mA
ICCZ4Loaded supply current drivers
disabled DIN = VDD or VSS
EN = VSS, EN = VDD 10.0 mA
Vos Voh Vol+
2
---------------------------=
6
Figure 5. Driver VOD and VOS Test Circuit or Equivalent Circuit
D
DIN
DOUT-
DOUT+
20pF
Driver Enabled
Generator
50Ω
RL = 100ΩVOD
20pF
7
AC SWITCHING CHARACTERISTICS1, 2, 3, 4
(VDD = +5.0V + 10%, TA = -55 °C to +125 °C)
Notes:
1. Channel-to-Channel Skew is defined as the difference between the propagation delay of the channel and the other channels in the same chip with an event on the inputs.
2. Generator waveform for all tests unless otherwise specified: f = 1 MHz, ZO = 50, tr < 6 ns, and tf < 6 ns.
3. CL includes probe and jig capacitance.
4. Guaranteed by characterization
5. Chip to Chip Skew is defined as the difference between the minimum and maximum specified differential propagation delays.
SYMBOL PARAMETER MIN MAX UNIT
tPHLD Differential Propagation Delay High to Low
(figures 6 and 7) 0.5 5.0 ns
tPLHD Differential Propagation Delay Low to High
(figures 6 and 7)0.5 5.0 ns
tSKD4Differential Skew (tPHLD - tPLHD) (figures 6 and 7) 03.0 ns
tSK14Channel-to-Channel Skew1 (figures 6 and 7) 03.0 ns
tSK24Chip-to-Chip Skew5 (figure 6 and 7) 4.5 ns
tTLH4Rise Time (figures 6 and 7)2.0 ns
tTHL4Fall Time (figures 6 and 7)2.0 ns
tPHZ4Disable Time High to Z (figures 8 and 9) 10 ns
tPLZ4Disable Time Low to Z (figures 8 and 9) 10 ns
tPZH4Enable Time Z to High (figures 8 and 9) 10 ns
tPZL4Enable Time Z to Low (figures 8 and 9) 10 ns
8
D
DIN
DOUT-
DOUT+
Driver Enabled
Generator
50Ω
RL = 100Ω
Figure 6. Driver Propagation Delay and Transition Time Test Circuit or Equivalant Circuit
20pF
20pF
DIN
DOUT-
DOUT+
VDIFF
tPHLD
VDD
0V
VOH
VOL
0V
VDIFF = DOUT+ - DOUT-
0V (Differential)
1.25V
tTHL
20%
80%
0V
20%
80%
tTLH
tPLHD
1.25V
Figure 7. Driver Propagation Delay and Transition Time Waveforms
9
D
VDD
VSS
DIN
EN
Generator
50ΩEN
50Ω
50Ω
DOUT+
DOUT-
+1.2V
Figure 8. Driver Three-State Delay Test Circuit or Equivalant Circuit
20pF
20pF
EN when EN = VDD
EN when EN = VSS
or
DOUT+ when DIN =VDD
DOUT- when DIN = VSS
DOUT+ when DIN = VSS
DOUT- when DIN = VDD tPLZ tPZL
50% 50%
VOL
1.2V
1.2V
VOH
0V
VDD
0V
VDD
1.25V
1.25V
1.25V
1.25V
50%
tPZH
tPHZ
Figure 9. Driver Three-State Delay Waveform
10
Notes:
1. All exposed metalized areas are gold plated over electroplated nickel per MIL-PRF-38535.
2. The lid is electrically connected to VSS.
3. Lead finishes are in accordance to MIL-PRF-38535.
4. Package dimensions and symbols are similar to MIL-STD-1835 variation F-5A.
5. Lead position and coplanarity are not measured.
6. ID mark symbol is vendor option.
7. With solder, increase maximum by 0.003.
Figure 10. 16-pin Ceramic Flatpack
PACKAGING
11
ORDERING INFORMATION
UT54LVDSC031 QUAD DRIVER:
UT54LVDSC031 - * * * * *
Device Type:
UT54LVDSC031 LVDS Driver
Access Time:
Not applicable
Package Type:
(U) = 16-lead Flatpack (dual-in-line)
Screening:
(C) = Military Temperature Range flow
(P) = Prototype flow
Lead Finish:
(A) = Hot solder dipped
(C) = Gold
(X) = Factory option (gold or solder)
Notes:
1. Lead finish (A,C, or X) must be specified.
2. If an “X” is specified when ordering, then the part marking will match the lead finish and will be either “A” (solder) or “C” (gold).
3. Prototype flow per UTMC Manufacturing Flows Document. Tested at 25°C only. Lead finish is GOLD ONLY. Radiation neither
tested nor guaranteed.
4. Military Temperature Range flow per UTMC Manufacturing Flows Document. Devices are tested at -55°C, room temp, and 125°C.
Radiation neither tested nor guaranteed.
12
UT54LVDSC031 QUAD DRIVER: SMD
5962 - * * *
Federal Stock Class Designator: No Options
Total Dose
(R) = 1E5 rad(Si)
(F) = 3E5 rad(Si)
Drawing Number: 95833
Device Type
03 = LVDS Driver
Class Designator:
(Q) = QML Class Q
(V) = QML Class V
Case Outline:
(X) = 16 lead Flatpack (dual-in-line)
Lead Finish:
(A) = Hot solder dipped
(C) = Gold
(X) = Factory Option (gold or solder)
95833 **
Notes:
1.Lead finish (A,C, or X) must be specified.
2.If an “X” is specified when ordering, part marking will match the lead finish and will be either “A” (solder) or “C” (gold).
3.Total dose radiation must be specified when ordering. QML Q and QML V not available without radiation hardening.
