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 A 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
n
Meets TIA/EIA-422-B (RS-422) and ITU-T V.11
recommendation
n
Interoperable with existing 5V RS-422 networks
n
Guaranteed V
OD
of 2V min over operating conditions
n
Balanced output crossover for low EMI (typical within 40
mV of 50% voltage level)
n
Low power design (330 W 3.3V static)
n
ESD
7 kV on cable I/O pins (HBM)
n
Industrial temperature range
n
Guaranteed AC parameter:
-- Maximum driver skew:
2 ns
-- Maximum transition time:
10 ns
n
Pin compatible with DS26C31
n
Available in SOIC packaging
Connection Diagram
Truth Table
Enables
Input
Outputs
EN
DI
DO+
DO-
L
X
Z
Z
H
H
H
L
H
L
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
DS34L
V87T
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 +25C
M Package
1226 mW
Derate M Package
9.8 mW/C above +25C
Storage Temperature Range
-65C to +150C
Lead Temperature Range
(Soldering, 4 sec.)
+260C
ESD Ratings
(HBM, 1.5k, 100 pF)
Driver Outputs
7 kV
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
= 100
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
= 3900
(V.11),
Figure 1 (Note 7)
3.2
3.5
V
V
OC
Common Mode Voltage
R
L
= 100
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
A
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
A
V
CC
= 0V, V
OUT
= -0.25V
-0.08
-100
A
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
A
I
IL
Low Level Input Current
V
IN
= GND
-10
A
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
A
DS34L
V87T
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2
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
= 100
, C
L
= 50 pF
(
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 )
12
20
ns
t
PLZ
Disable Time Low to Z
9
20
ns
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 V
OD1
, V
OD2
, V
OD3
.
Note 3: All typical values are given for V
CC
= 3.3V and T
A
= +25C.
Note 4: Only one output shorted at a time. The output (true or complement) is configured High.
Note 5: f = 1 MHz, t
r
and t
f
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 V
CC
and within 5C 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
DS34L
V87T
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3
Parameter Measurement Information
(Continued)
Note 10: Generator waveform for all tests unless otherwise specified: f = 1 MHz, Duty Cycle = 50%, Z
o
= 50
, t
r
10 ns, t
f
10 ns.
Note 11: C
L
includes 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
DS34L
V87T
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4
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 F in parallel
with 0.01 F at the power supply pin. A 10 F 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
DS34L
V87T
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