HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER
JUNE 2011
REV. 1.1.1
GENERAL DESCRIPTION
The
SP26LV431
is a quad differential line driver that
meets the specifications of the EIA standard RS-422
serial protocol. The
SP26LV431
features Exar's
BiCMOS process allowing low power operational
characteristics of CMOS technology while meeting all
of the demands of the RS-422 serial protocol over
60Mbps under load. The RS-422 protocol allows up
to 10 receivers to be connected to a multipoint bus
transmission line. The
SP26LV431
features a driver
enable control common to all four drivers that places
the output pins in a high impedance state. Since the
cabling can be as long as 4,000 feet, the RS-422
drivers of the
SP26LV431
are equipped with a wide
common-mode output voltage range to accommodate
ground potential differences.
F
IGURE
1. T
YPICAL
A
PPLICATION
C
IRCUIT
FEATURES
•
Quad Differential Line Drivers
•
Compatible with the EIA standard for RS-422 serial
protocol
•
High-Z Output Control
•
At Least 60Mbps Transmission Rates
•
11ns Typical Driver Propagation Delays
•
Less than 1ns Typical Output Skew
•
Single +3.3V Supply Operation
•
Common Driver Enable Control
•
Compatibility with the industry standard 26LV31
•
Ideal For Use with SP26LV432, Quad Receivers
Exar
Corporation 48720 Kato Road, Fremont CA, 94538
•
(510) 668-7000
•
FAX (510) 668-7017
•
www.exar.com
SP26LV431
HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER
F
IGURE
2. P
IN
O
UT
A
SSIGNMENT
REV. 1.1.1
ORDERING INFORMATION
P
ART
N
UMBER
SP26LV431CN-L
SP26LV431CN-L/TR
SP26LV431EN-L
SP26LV431EN-L/TR
P
ACKAGE
16-pin Narrow SOIC
16-pin Narrow SOIC
16-pin Narrow SOIC
16-pin Narrow SOIC
O
PERATING
T
EMPERATURE
R
ANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
D
EVICE
S
TATUS
Active
Active
Active
Active
2
SP26LV431
REV. 1.1.1
HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER
PIN DESCRIPTIONS
Pin Assignments
P
IN
N
UMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
P
IN
N
AME
DI
1
DO
1
A
DO
1
B
ENABLE
DO
2
B
DO
2
A
DI
2
GND
DI
3
DO
3
A
DO
3
B
ENABLE
DO
4
B
DO
4
A
DI
4
V
CC
T
YPE
I
O
O
I
O
O
I
Pwr
I
O
O
I
O
O
I
Pwr
Driver 1 TTL input.
Non-inverted driver 1 output.
Inverted driver 1 output.
Driver output enable, active HIGH.
Inverted driver 2 output.
Non-inverted driver 2 output.
Driver 2 TTL input.
Ground.
Driver 3 TTL input.
Non-inverted driver 3 output.
Inverted driver 3 output.
Driver output enable, active LOW.
Inverted driver 4 output.
Non-inverted driver 4 output.
Driver 4 TTL input.
+3.0V to +3.6V power supply.
D
ESCRIPTION
Pin type: I=Input, O=Output.
3
SP26LV431
HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER
REV. 1.1.1
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections to the
specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent
damage to the device.
V
CC
V
IN
(DC Input Voltage)
V
OUT
(DC Output Voltage)
I
IK
, I
OK
(Clamp Diode Current)
I
OUT
(DC Output Current, per pin)
I
CC
(DC V
CC
or GND Current, per pin)
Storage Temperature Range
Power Dissipation 16-pin PDIP
(derate 14.3mW/°C above +70°C)
Power Dissipation 16-pin NSOIC
(derate 13.6mW/°C above +70°C)
0.5V to 7.0V
-1.5V to (V
CC
+ 1.5V)
-0.5V to 7V
±20mA
±150mA
±150mA
-65°C to + 150°C
1150mW
1100mW
CAUTION:
ESD (Electrostatic Discharge) sensitive device. Permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused
devices must be stored in conductive foam or shunts. Personnel should be properly grounded prior to handling this device. The protective foam should be
discharged to the destination socket before devices are removed.
ELECTRICAL CHARACTERISTICS
U
NLESS OTHERWISE NOTED
: T
HE FOLLOWING SPECIFICATIONS APPLY FOR
VCC = +3.0V
TO
+3.6V
WITH
TA =
+25
O
C
AND ALL
MIN
AND
MAX
LIMITS APPLY ACROSS THE RECOMMENDED OPERATING TEMPERATURE RANGE
.
S
YMBOL
V
CC
V
IN
or V
OUT
P
ARAMETERS
Supply Voltage
DC Input or Output Voltage
M
IN
.
3.0
TYP.
M
AX
.
3.6
VCC
U
NITS
V
V
C
ONDITIONS
Input Electrical Characteristics
t
r
or t
f
V
IH
V
IL
Input Rise or Fall Times
HIGH Level Input Voltage
LOW Level Input Voltage
2.0
0.8
3
ns
V
V
Output Electrical Characteristics
V
OH
V
OL
V
T
V
T
–
V
T
HIGH Level Output Voltage
LOW Level Output Voltage
Differential Output Voltage
Differential Output Voltage
Common Mode Output Voltage
Difference in Common Mode Output
Quiescent Supply Current
2.5
2.9
0.2
0.5
V
V
V
0.4
3.0
0.4
100
V
V
V
uA
V
IN
= V
IH
or V
IL
, I
OUT
= -20mA
V
IN
= V
IH
or V
IL
, I
OUT
= 20mA
R
L
= 100Ω, Note 1
R
L
= 100Ω, Note 1
R
L
= 100Ω, Note 1
R
L
= 100Ω, Note 1
V
IN
= V
CC
or GND, Note 2
2.0
2.7
V
OS
V
OS
–
V
OS
I
CC
4
SP26LV431
REV. 1.1.1
HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER
U
NLESS OTHERWISE NOTED
: T
HE FOLLOWING SPECIFICATIONS APPLY FOR
VCC = +3.0V
TO
+3.6V
WITH
TA =
+25
O
C
AND ALL
MIN
AND
MAX
LIMITS APPLY ACROSS THE RECOMMENDED OPERATING TEMPERATURE RANGE
.
S
YMBOL
I
OZ
I
SC
I
OFF
I
OFF
P
ARAMETERS
Tri-state Output Leakage Current
M
IN
.
TYP.
±2.0
M
AX
.
U
NITS
uA
C
ONDITIONS
V
OUT
= V
CC
or GND,
ENABLE = V
IL
, ENABLE = V
IH
Output Short Circuit Current
Output Leakage Current Power Off
Output Leakage Current Power Off
-30
-150
100
-100
mA
uA
uA
V
IN
= V
CC
or GND, Notes 1 & 3
V
CC
= 0V, V
OUT
= 6V, Note 1
V
CC
= 0V, V
OUT
= -0.25V, Note
1
Switching Characteristics
t
PLHD
, t
PHLD
t
SKEW
t
SKEW
t
TLH
, t
THL
t
PZH
t
PZL
t
PHZ
t
PLZ
C
PD
C
IN
N
OTE
:
1.
2.
3.
4.
5.
6.
Refer to EIA specifications for RS-422 serial protocol for exact test conditions.
Measured per input. All other inputs at V
CC
or GND.
This is the current sourced when a high output is shorted to GND. Only one output at a time should be shorted.
Skew is defined as the difference in propagation delays between complementary outputs at the 50% input.
Output disable time is the delay from ENABLE or ENABLE being switched to the output transistors turning off.
The actual disable times are less than indicated due to the delay added by the RC time constant of the load.
C
PD
determines the no load dynamic power consumption, P
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