SP431
SIGNAL PROCESSING EXCELLENCE
High Speed, +3.3V Quad RS-422
Differential Line Driver
s
Compatible with the EIA standard for
RS-422 serial protocol
s
Quad Differential Line Drivers
s
Tri-state Output Control
s
At Least 60Mbps Transmission Rates
s
6.0ns Typical Driver Propagation Delays
s
Less than 1ns Typical Output Skew
s
Single +3.3V Supply Operation
s
Common Driver Enable Control
s
Compatibility with the industry standard
26LV31
DESCRIPTION
The
SP431
is a quad differential line driver that meets the specifications of the EIA standard
RS-422 serial protocol. The
SP431
features Sipex'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
SP431
features a driver
enable control common to all four drivers and a tri-state output. Since the cabling can be as
long as 4,000 feet, the RS-422 drivers of the
SP431
are equipped with a wide common-mode
output voltage range to accomodate ground potential differences.
DI1
D01A
D01B
ENABLE
D02B
D02A
DI2
GND
1
2
3
4
5
6
7
8
16 V
CC
V
CC
DI4
INPUTS
DI3
DI2
DI1
SP431
15 DI4
14 D04A
13 D04B
12 ENABLE
11 D0 B
3
10 D0 A
3
9 DI
3
ENABLE
ENABLE
DO A DO B DO A DO B DO A DO B DO A DO B
3
4
3
2
2
1
1
4
GND
OUTPUTS
SP431DS/08
SP431 High Speed, +3.3V Quad RS-422 Differential Line Driver
© Copyright 1997 Sipex Corporation
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
of 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
........................................................................................0.5V to 7.0V
V
IN
(DC Input Voltage).............................................-1.5V to (V
CC
+ 1.5V)
V
OUT
(DC Output Voltage)......................................................-0.5V to 7V
I
IK
, I
OK
(Clamp Diode Current)........................................................±20mA
I
OUT
(DC Output Current, per pin)................................................±150mA
I
CC
(DC V
CC
or GND Current, per pin)..........................................±150mA
T
STG
(Storage Temperature Range)...............................-65°C to +150°C
Storage Temperature....................................................-65°C to +150°C
Power Dissipation Per Package
16-pin PDIP (derate 14.3mW/
o
C above +70
o
C).........................1150mW
16-pin NSOIC (derate 13.6mW/
o
C above +70
o
C)......................1100mW
V
CC
DI4
INPUTS
DI3
DI2
DI1
ENABLE
ENABLE
DO A DO B DO A DO B DO A DO B DO A DO B
3
4
3
2
2
1
1
4
GND
Figure 1. SP431 Block Diagram
OUTPUTS
SP431DS/08
SP431 High Speed, +3.3V Quad RS-422 Differential Line Driver
© Copyright 1997 Sipex Corporation
2
SPECIFICATIONS
Unless otherwise noted, the following specifications apply for V
CC
= +3.0V to +3.6V with T
amb
= 25°C and all MIN
and MAX limits apply across the recommended operating temperature range.
DC PARAMETERS
Supply Voltage, V
CC
DC Input or Output Voltage, V
IN
or V
OUT
Input Electrical Characteristics
Input Rise or Fall Times, t
r
or t
f
HIGH Level Input Voltage, V
IH
LOW Level Input Voltage, V
IL
Output Electrical Characteristics
HIGH Level Output Voltage, V
OH
LOW Level Output Voltage, V
OL
Differential Output Voltage, V
T
Difference in Differential Output, |V
T
| - |V
T
|
Common Mode Output Voltage, V
OS
Difference in Common Mode Output, |V
OS
-V
OS
|
Quiescent Supply Current
I
CC
Tri-state Output Leakage Current, I
OZ
±2.0
100
µA
µA
V
IN
= V
CC
or GND, Note 2
V
OUT
= V
CC
or GND,
ENABLE = V
IL
,
ENABLE = V
IH
V
IN
= V
CC
or GND, Notes 1 and 3
V
CC
= 0V, V
OUT
= 6V, Note 1
V
CC
= 0V, V
OUT
= -0.25V, Note 1
2.0
2.5
2.9
0.2
2.7
0.4
3.0
0.4
0.5
V
V
V
V
V
V
V
IN
= V
IH
or V
IL
, I
OUT
= -20mA
V
IN
= V
IH
or V
IL
, I
OUT
= 20mA
R
L
= 100
Ω
, Note 1
R
L
= 100
Ω
, Note 1
R
L
= 100
Ω
, Note 1
R
L
= 100
Ω
, Note 1
2.0
0.8
3
ns
V
V
MIN. TYP. MAX.
3.0
3.6
V
CC
UNITS
V
V
CONDITIONS
Output Short Circuit Current, I
SC
Output Leakage Current Power Off
I
OFF
I
OFF
-30
-150
mA
µA
µA
100
-100
NOTE 1:
Refer to EIA specifications for RS-422 serial protocol for exact test conditions.
NOTE 2:
Measured per input. All other inputs at V
CC
or GND.
NOTE 3:
This is the current sourced when a high output is shorted to GND. Only one output at a time should be shorted.
SP431DS/08
SP431 High Speed, +3.3V Quad RS-422 Differential Line Driver
© Copyright 1997 Sipex Corporation
3
SPECIFICATIONS (continued)
Unless otherwise noted, the following specifications apply for V
CC
= +3.0V to +3.6V, T
amb
= 25°C, t
r
< 6ns, t
f
< 6ns,
and all MIN and MAX limits apply across the recommended operating temperature range.
PARAMETERS
SWITCHING CHARACTERISTICS
Propagation Delays, t
PLHD
, t
PHLD
Skew
Differential Ouput Rise and Fall Times, t
TLH
, t
PHL
Output Enable Time, t
PZH
Output Enable Time, t
PZL
Output Disable Time, t
PHZ
Output Disable Time, t
PLZ
Power dissipation Capacitance, C
PD
Input Capacitance, C
IN
5
0.5
3
13
8
8
6
50
6
ns
ns
ns
ns
ns
ns
ns
pF
pF
Figure 3
Figure 3, Note 4
Figure 3
Figure 5
Figure 5
Figure 5, Note 5
Figure 5, Note 5
Note 6
MIN. TYP. MAX. UNITS
CONDITIONS
NOTE 4:
Skew is defined as the difference in propagation delays between complementary outputs at the 50% input.
NOTE 5:
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.
NOTE 6:
C
PD
determines the no load dynamic power consumption, P
D
= (C
PD
V
CC2
f) + (I
CC
V
CC
), and the no load dynamic
current consumption, I
S
= (C
PD
V
CC
f) + I
CC
.
SP431DS/08
SP431 High Speed, +3.3V Quad RS-422 Differential Line Driver
© Copyright 1997 Sipex Corporation
4
AC TEST CIRCUITS AND SWITCHING TIME WAVEFORMS
f=1 MHz t
R
< 10ns, t
F
< 10ns
3V
DRIVER
INPUT DIX
1.5V
t
PLHD
DRIVER D0
X
B
1.5V
t
PHLD
0V (Differential)
DRIVER D0
X
A
80%
DIFFERENTIAL
OUTPUT
20%
t
TLH
0V
V
DIFF
= V
A
- V
B
t
THL
80%
0V
20%
0V
V
OL
GND
V
OH
CL
Generator
Driver
Enabled
DI
X
50Ω
D
CL
CL
RL
D0
X
A
D0
X
B
Figure 2. AC Test Circuit
Figure 3. Propagation Delays
ENABLE
3V
V
CC
D0
X
A
S1
S2
Test
Point
S3
110Ω
1.5V
1.5V
0V
V
CC
D0
X
B
ENABLE
ENABLE
If ENABLE is the input, then ENABLE = HIGH
If ENABLE is the input, then ENABLE = LOW
CL
ENABLE
t
PHZ
Input = ENABLE or ENABLE
S1= V
CC
S2 = D0
X
B
S3 = GND
and/or
S1 = GND
t
PLZ
S2 = D0
X
A
S3 = GND
Input = ENABLE or ENABLE
S1= GND
S2 = D0
X
B
S3 = V
CC
and/or
S1 = V
CC
S2 = D0
X
A
S3 = V
CC
t
PZH
V
OH
= 0.3V
V
OH
1.3V
GND
t
PZL
V
CC
V
OL
+ 0.3V
1.3V
V
OL
Figure 4. Driver Single-Ended TRI-STATE Test Circuit
Figure 5. Driver Single-Ended TRI-STATE Waveforms
3.0V
INPUT
0.0V
OUTPUT
(DIFFERENTIAL)
90%
10%
t
TLH
Input pulse: f = 1MHz, 50%
t
r
< 6ns
t
f
< 6ns
t
THL
90%
10%
Figure 6. Differential Rise and Fall Times
SP431DS/08
SP431 High Speed, +3.3V Quad RS-422 Differential Line Driver
© Copyright 1997 Sipex Corporation
5
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