DS34LV87T
Enhanced CMOS Quad Differential Line Driver
General Description
The DS34LV87T is a high speed quad differential CMOS
driver that meets the requirements of both TIA/EIA-422-B
and ITU-T V.11. The CMOS DS34LV87T features low static
I
CC
of 100 µA max which makes it ideal for battery powered
and power conscious applications. The TRI-STATE®enable,
EN, allows the device to be disabled when the device is not
in use to minimize power. The dual enable scheme allows for
flexibility in turning devices on or off.
Protection diodes protect all the driver inputs against elec-
trostatic discharge. The driver and enable inputs (DI and EN)
are compatible with LVTTL and LVCMOS devices. Differen-
tial outputs have the same V
OD
(≥2V) guarantee as the 5V
version. The outputs have enhanced ESD Protection provid-
ing greater than 7 kV tolerance.
Features
nMeets TIA/EIA-422-B (RS-422) and ITU-T V.11
recommendation
nInteroperable with existing 5V RS-422 networks
nGuaranteed V
OD
of 2V min over operating conditions
nBalanced output crossover for low EMI (typical within 40
mV of 50% voltage level)
nLow power design (330 µW 3.3V static)
nESD ≥7 kV on cable I/O pins (HBM)
nIndustrial temperature range
nGuaranteed AC parameter:
— Maximum driver skew: 2 ns
— Maximum transition time: 10 ns
nPin compatible with DS26C31
nAvailable in SOIC packaging
Connection Diagram Truth Table
Enables Input Outputs
EN DI DO+ DO−
LX Z Z
HH H L
HL L H
L = Low logic state
X = Irrelevant
H = High logic state
Z = TRI-STATE
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
Dual-In-Line Package
DS012645-1
Top View
Order Number DS34LV87TM
See NS Package Number M16A
November 2000
DS34LV87T Enhanced CMOS Quad Differential Line Driver
© 2000 National Semiconductor Corporation DS012645 www.national.com
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 (V
CC
) −0.5V to +7V
Enable Input Voltage (EN) −0.5V to V
CC
+ 0.5V
Driver Input Voltage (D
I
) −0.5V to V
CC
+ 0.5V
Clamp Diode Current ±20 mA
DC Output Current, per pin ±150 mA
Driver Output Voltage
(Power Off: DO+, DO−) −0.5V to +7V
Maximum Package Power Dissipation +25˚C
M Package 1226 mW
Derate M Package 9.8 mW/˚C above +25˚C
Storage Temperature Range −65˚C to +150˚C
Lead Temperature Range
(Soldering, 4 sec.) +260˚C
ESD Ratings
(HBM, 1.5k, 100 pF)
Driver Outputs ≥7kV
Other Pins ≥2.5 kV
Recommended Operating
Conditions
Min Typ Max Units
Supply Voltage (V
CC
) 3.0 3.3 3.6 V
Operating Free Air
Temperature Range (T
A
)
DS34LV87T −40 25 +85 ˚C
Input Rise and Fall Time 500 ns
Electrical Characteristics (Notes 2, 3)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
Symbol Parameter Conditions Pin Min Typ Max Units
V
OD1
Output Differential Voltage R
L
=∞, (No Load) DO+, 3.3 4.0 V
V
OD2
Output Differential Voltage R
L
= 100Ω
Figure 1
DO− 2 2.6 V
∆V
OD2
Change in Magnitude of −400 7 400 mV
Output Differential Voltage
V
OD3
Output Differential Voltage R
L
= 3900Ω(V.11),
Figure 1
(Note 7) 3.2 3.5 V
V
OC
Common Mode Voltage R
L
= 100Ω
Figure 1
1.5 2 V
∆V
OC
Change in Magnitude of −400 6 400 mV
Common Mode Voltage
I
OZ
TRI-STATE Leakage V
OUT
=V
CC
or GND ±0.5 ±20 µA
Current Drivers Disabled
I
SC
Output Short Circuit Current V
OUT
=0V
V
IN
=V
CC
or GND (Note 4) −40 −70 −150 mA
I
OFF
Output Leakage Current V
CC
= 0V, V
OUT
= 3V 0.03 100 µA
V
CC
= 0V, V
OUT
= −0.25V −0.08 −100 µA
V
IH
High Level Input Voltage DI, 2.0 V
CC
V
V
IL
Low Level Input Voltage EN GND 0.8 V
I
IH
High Level Input Current V
IN
=V
CC
10 µA
I
IL
Low Level Input Current V
IN
= GND −10 µA
V
CL
Input Clamp Voltage I
IN
= −18 mA −1.5 V
I
CC
Power Supply Current No Load, V
IN
(all) = V
CC
or GND V
CC
100 µA
DS34LV87T
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Switching Characteristics (Notes 5, 6)
Over Supply Voltage and Operating Temperature ranges, unless otherwise specified
Symbol Parameter Conditions Min Typ Max Units
t
PHLD
Differential Propagation Delay R
L
= 100Ω,C
L
=50pF
(
Figures 2, 3
)6 10.5 16 ns
High to Low
t
PLHD
Differential Propagation Delay 6 11 16 ns
Low to High
t
SKD
Differential Skew 0.5 2.0 ns
|t
PHLD
–t
PLHD
|
t
SK1
Skew, Pin to Pin (same device) 1.0 2.0 ns
t
SK2
Skew, Part to Part (Note 8) 3.0 5.0 ns
t
TLH
Differential Transition Time 4.2 10 ns
Low to High (20% to 80%)
t
THL
Differential Transition Time 4.7 10 ns
High to Low (80% to 20%)
t
PHZ
Disable Time High to Z (
Figures 4, 5
)1220ns
t
PLZ
Disable Time Low to Z 920ns
t
PZH
Enable Time Z to High 22 32 ns
t
PZL
Enable Time Z to Low 22 32 ns
f
MAX
Maximum Operating Frequency 32 MHz
(Note 9)
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 device
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 differential
voltages VOD1,V
OD2,V
OD3.
Note 3: All typical values are given for VCC= 3.3V and TA= +25˚C.
Note 4: Only one output shorted at a time. The output (true or complement) is configured High.
Note 5: f = 1 MHz, trand tf≤6 ns (10% to 90%).
Note 6: See TIA/EIA-422-B specifications for exact test conditions.
Note 7: This specification limit is for compliance with TIA/EIA-422-B and ITU-T V.11.
Note 8: Devices are at the same VCC and within 5˚C within the operating temperature range.
Note 9: All channels switching, output duty cycle criteria is 40%/60% measured at 50%. This parameter is guaranteed by design and characterization.
Parameter Measurement Information
DS012645-2
FIGURE 1. Differential Driver DC Test Circuit
DS34LV87T
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Parameter Measurement Information (Continued)
Note 10: Generator waveform for all tests unless otherwise specified:f=1MHz, Duty Cycle = 50%, Zo=50Ω,t
r≤10 ns, tf≤10 ns.
Note 11: CLincludes probe and fixture capacitance.
DS012645-3
FIGURE 2. Differential Driver Propagation Delay and Transition Time Test Circuit
DS012645-4
FIGURE 3. Differential Driver Propagation Delay and Transition Time Waveforms
DS012645-5
FIGURE 4. Driver Single-Ended TRI-STATE Test Circuit
DS34LV87T
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Parameter Measurement Information (Continued)
Typical Application Information
General application guidelines and hints for differential driv-
ers and receivers may be found in the following application
notes:
AN-214, AN-457, AN-805, AN-847, AN-903, AN-912,
AN-916.
Power Decoupling Recommendations:
Bypass caps must be used on power pins. High frequency
ceramic (surface mount is recommended) 0.1 µF in parallel
with 0.01 µF at the power supply pin. A 10 µF or greater
tantalum or electrolytic should be connected at the power
entry point on the printed circuit board.
DS012645-6
FIGURE 5. Driver Single-Ended TRI-STATE Waveforms
DS012645-7
R
T
is optional although highly recommended to reduce reflection
DS012645-8
FIGURE 6. Typical Driver Connection
DS34LV87T
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Typical Application Information (Continued)
DS012645-9
FIGURE 7. Typical Driver Output Waveforms
DS34LV87T
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Physical Dimensions inches (millimeters) unless otherwise noted
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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www.national.com
16-Lead Molded Small Outline Package (M)
Order Number DS34LV87TM
NS Package Number M16A
DS34LV87T Enhanced CMOS Quad Differential Line Driver
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
