10/15/02
SP3486/3487 Low Power Quad RS485/422 Line Drivers
Copyright 2002 Sipex Corporation
1
DESCRIPTION
The SP3486 and the SP3487 are +3.3V low power quad drivers that meet the specifications
of the RS-485 and RS-422 serial protocols. These devices are pin-to-pin compatible with
Sipex's SP486 and SP487 devices as well as popular industry standards. The SP3486 and
SP3487 feature Sipex's BiCMOS process allowing low power operation without sacrificing
performance. The SP3486 and SP3487 meet the electrical specifications of RS-485 and
RS-422 serial protocols up to 10Mbps under load. The SP3486 features a common driver
enable control. The SP3487 provides independent driver enable controls for each pair of
drivers. Both devices feature tri-state outputs and a -7V to +12V common-mode input voltage
range.
RS-485 or RS-422 Quad Differential
Line Drivers
Operates from a single +3.3V supply
Interoperable with +5.0V logic
Tri-state Output Control
-7V to +12V Common-Mode Input
Voltage Range
Common Driver Enable Control (SP3486)
Independent Driver Enable Controls for
each pair of Drivers (SP3487)
Compatibility with LTC486
and SN75172 (SP3486)
Compatibility with LTC487
and SN75174 (SP3487)
1
2
3
4
SP3487
DI
1
DO
1
A
DO
1
B
EN
1
/EN
2
DO
2
B
DO
2
A
DI
2
GND
V
CC
DI
4
DO
4
A
DO
4
B
EN
3
/EN
4
DO
3
B
DO
3
A
DI
3
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
2
3
4
SP3486
DI
1
DO
1
A
DO
1
B
EN
DO
2
B
DO
2
A
DI
2
GND
V
CC
DI
4
DO
4
A
DO
4
B
EN
DO
3
B
DO
3
A
DI
3
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SP3486 and SP3487
+3.3V Low Power Quad
RS-485/RS-422 Line Drivers
10/15/02 SP3486/3487 Low Power Quad RS485/422 Line Drivers
Copyright 2000 Sipex Corporation
2
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device
at these 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.
V
CC
......................................................................................... +6.0V
Input Voltages
Logic ............................................................ 0.3V to +6.0V
Drivers ......................................................... 0.3V to +6.0V
Driver Output Voltage .............................................................
14V
Input Currents
Logic ........................................................................
25mA
Driver .......................................................................
25mA
Storage Temperature ............................................ 65
C to +150
C
Power Dissipation
Plastic DIP .......................................................................... 375mW
(derate 7mW/
C above +70
C)
Small Outline ...................................................................... 375mW
(derate 7mW/
C above +70
C)
Lead Temperature (soldering, 10 sec) ................................... 300
C
PARAMETER
MIN.
TYP.
MAX.
UNIT
CONDITIONS
DC CHARACTERISTICS
Digital Inputs
DI, EN, EN, EN
1
/EN
2
, EN
3
/EN
4
Voltage
V
IL
0.8
Volts
V
IH
2.0
Volts
Input Current
2
A
V
IN
= 0V to V
CC
DRIVER OUTPUTS
Differential Voltage
V
CC
Volts
unloaded
2
Volts
R = 50
(RS-422)
1.5
V
CC
Volts
R
= 27
(RS-485);
Figure 1
Common Mode Output Voltage
3
Volts
R = 27
or 50
;
Figure 1
Change in Common Mode Output Magnitude
0.2
Volts
R
= 27
or 50
;
Figure 1
for Complementary Output State
R = 50
(RS-422)
R
= 27
(RS-485)
Maximum Data Rate
10
Mbps
Shortcircuit Current
V
OH
250
mA
-7V
V
O
+12V
V
OL
250
mA
-7V
V
O
+12V
High Impedance Output Current
1
A
V
O
= -7V to +12V, T
A
=25
o
C
POWER REQUIREMENTS
Supply Voltage
3.00
3.30
3.60
Volts
Supply Current
3.00
A
No load, output enabled
0.10
A
No load, output disabled
ENVIRONMENTAL AND MECHANICAL
Operating Temperature
C
0
+70
C
E
-40
+85
C
Storage Temperature
-65
+150
C
Package
_P
16pin Plastic DIP
_T
16pin SOIC
SPECIFICATIONS
V
CC
= 3.3V
5%; typicals at 25
C; T
MIN
T
A
T
MAX
unless otherwise noted.
10/15/02
SP3486/3487 Low Power Quad RS485/422 Line Drivers
Copyright 2002 Sipex Corporation
3
PINOUT -- SP3486
1
2
3
4
SP3486
DI
1
DO
1
A
DO
1
B
EN
DO
2
B
DO
2
A
DI
2
GND
V
CC
DI
4
DO
4
A
DO
4
B
EN
DO
3
B
DO
3
A
DI
3
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Figure 2. Driver Propagation Delay Test Circuit
Figure 1. Driver DC Test Load Circuit
Figure 3. Driver Enable and Disable Timing Circuit,
Output HIGH
SP3486 PINOUT
Pin 1 -- DI
1
-- Driver 1 Input -- If Driver 1 output
is enabled, logic 0 on DI
1
forces driver output
DO
1
A low and DO
1
B high. A logic 1 on DI
1
with
Driver 1 output enabled forces driver DO
1
A high
and DO
1
B low.
Pin 2 -- DO
1
A -- Driver 1 output A.
Pin 3 -- DO
1
B -- Driver 1 output B.
Pin 4 -- EN -- Driver Output Enable. Please refer
to SP3486 Truth Table (1).
Pin 5 -- DO
2
B -- Driver 2 output B.
Pin 6 -- DO
2
A -- Driver 2 output A.
Pin 7 -- DI
2
-- Driver 2 Input -- If Driver 2 output
is enabled, logic 0 on DI
2
forces driver output
DO
2
A low and DO
2
B high. A logic 1 on DI
2
with
Driver 2 output enabled forces driver DO
2
A high
and DO
2
B low.
Pin 8 -- GND -- Digital Ground.
Pin 9 -- DI
3
-- Driver 3 Input -- If Driver 3 output
is enabled, logic 0 on DI
3
forces driver output
DO
3
A low and DO
3
B high. A logic 1 on DI
3
with
Driver 3 output enabled forces driver DO
3
A high
and DO
3
B low.
Pin 10 -- DO
3
A -- Driver 3 output A.
Pin 11 -- DO
3
B -- Driver 3 output B.
Pin 12 -- EN -- Driver Output Disable. Please
refer to SP486 Truth Table (1).
Figure 4. Driver Enable and Disable Timing Circuit,
Output LOW
R
R
V
OC
D
V
CC
V
OD
GENERATOR
(NOTE 1)
50
V
CC
S1
V
DM
R
L
= 27
OUT
C
L
= 15PF
(NOTE 2)
V
OM
= 1.5V
V
OH
+ V
OL
2
D
GENERATOR
(NOTE 1)
50
S1
R
L
= 110
OUT
C
L
= 50pF
(NOTE 2)
V
OM
= 1.5V
V
OH
+ V
OL
2
D
GENERATOR
(NOTE 1)
50
S1
R
L
= 110
OUT
C
L
= 50pF
(NOTE 2)
D
0V OR 3V
V
CC
10/15/02 SP3486/3487 Low Power Quad RS485/422 Line Drivers
Copyright 2000 Sipex Corporation
4
PINOUT -- SP3487
1
2
3
4
SP3487
DI
1
DO
1
A
DO
1
B
EN
1
/EN
2
DO
2
B
DO
2
A
DI
2
GND
V
CC
DI
4
DO
4
A
DO
4
B
EN
3
/EN
4
DO
3
B
DO
3
A
DI
3
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Pin 13 -- DO
4
B -- Driver 4 output B.
Pin 14 -- DO
4
A -- Driver 4 output A.
Pin 15 -- DI
4
-- Driver 4 Input -- If Driver 4
output is enabled, logic 0 on DI
4
forces driver
output DO
4
A low and DO
4
B high. A logic 1 on DI
4
with Driver 4 output enabled forces driver DO
4
A
high and DO
4
B low.
Pin 16--V
CC
--Positive Supply +3.00V<V
CC
<+3.60V
SP3487 PINOUT
Pin 1 -- DI
1
-- Driver 1 Input -- If Driver 1 output
is enabled, logic 0 on DI
1
forces driver output
DO
1
A low and DO
1
B high. A logic 1 on DI
1
with
Driver 1 output enabled forces driver DO
1
A high
and DO
1
B low.
Pin 2 -- DO
1
A -- Driver 1 output A.
Pin 3 -- DO
1
B -- Driver 1 output B.
Pin 4 -- EN
1
/EN
2
-- Driver 1 and 2 Output
Enable. Please refer to SP3487 Truth Table (2).
Pin 5 -- DO
2
B -- Driver 2 output B.
Pin 6 -- DO
2
A -- Driver 2 output A.
Pin 7 -- DI
2
-- Driver 2 Input -- If Driver 2 output
is enabled, logic 0 on DI
2
forces driver output
DO
2
A low and DO
2
B high. A logic 1 on DI
2
with
Driver 2 output enabled forces driver DO
2
A high
and DO
2
B low.
INPUT
ENABLES
OUTPUTS
DI
EN
EN
OUTA
OUTB
H
H
X
H
L
L
H
X
L
H
H
X
L
H
L
L
X
L
L
H
X
L
H
HiZ
HiZ
Table 1. SP3486 Truth Table
INPUT
ENABLES
OUTPUTS
DI
EN1/EN2 or EN3/EN4
OUTA
OUTB
H
H
H
L
L
H
L
H
X
L
HiZ
HiZ
Table 2. SP3487 Truth Table
Pin 8 -- GND -- Digital Ground.
Pin 9 -- DI
3
-- Driver 3 Input -- If Driver 3 output
is enabled, logic 0 on DI
3
forces driver output
DO
3
A low and DO
3
B high. A logic 1 on DI
3
with
Driver 3 output enabled forces driver DO
3
A high
and DO
3
B low.
Pin 10 -- DO
3
A -- Driver 3 output A.
Pin 11 -- DO
3
B -- Driver 3 output B.
Pin 12 -- EN
3
/EN
4
-- Driver 3 and 4 Output
Enable. Please refer to SP3487 Truth Table (2).
Pin 13 -- DO
4
B -- Driver 4 output B.
Pin 14 -- DO
4
A -- Driver 4 output A.
Pin 15 -- DI
4
-- Driver 4 Input -- If Driver 4
output is enabled, logic 0 on DI
4
forces driver
output DO
4
A low and DO
4
B high. A logic 1 on DI
4
with Driver 4 output enabled forces driver DO
4
A
high and DO
4
B low.
Pin 16 --V
CC
--Positive Supply +3.00V < V
CC
< +3.60V
10/15/02
SP3486/3487 Low Power Quad RS485/422 Line Drivers
Copyright 2002 Sipex Corporation
5
AC PARAMETERS
V
CC
= +3.3V
5%; typicals at 25
C; T
AMB
= 25
C unless otherwise noted.
PARAMETER
MIN.
TYP.
MAX.
UNIT
CONDITIONS
PROPAGATION DELAY
Driver Input to Output
Figure 2 and 5
Low to High (t
PLH
)
20
40
60
ns
High to Low (t
PHL
)
20
40
60
ns
Differential Driver Skew
5
10
ns
| t
PHL
(Y) - t
PLH
(Y) |, | t
PHL
(Z) - t
PLH
(Z) | ,
Figures 2 and 5
Driver Rise Time (t
R
)
10% to 90% R
DIFF
= 60
SP3486
10
ns
SP3487
10
ns
Driver Fall Time (t
F
)
90% to 10% R
DIFF
= 60
SP3486
10
ns
SP3487
10
ns
DRIVER ENABLE
To Output High
110
ns
Figures 3 and 6
To Output Low
110
ns
Figures 4 and 6
DRIVER DISABLE
From Output Low
110
ns
Figures 4 and 6
From Output High
110
ns
Figures 3 and 6
FEATURES
The SP3486 and the SP3487 are +3.3V low power
quad line drivers that meet the specifications of
the RS-485 and RS-422 serial protocols. These
devices are pin-to-pin compatible with Sipex's
SP486 and SP487 devices as well as popular
industry standards. The SP3486 and SP3487
devices feature Sipex's BiCMOS process
allowing low power operation without sacrificing
performance.
The RS-485 standard is ideal for multi-drop
applications or for long distance interfaces.
RS-485 allows up to 32 drivers and 32 receivers
to be connected to a data bus, making it an ideal
choice for multi-drop applications. Since the
cabling can be as long as 4,000 feet, RS-485
transceivers are equipped with a wide (-7V to
+12V) common mode range to accomodate
ground potential differences. Data is virtually
immune to noise in the transmission line because
the RS-485 protocol is a differential interface.
Driver
The drivers for both the SP3486 and SP3487
have differential outputs. The typical voltage
output swing with no load will be 0V to +5V.
With worst case loading of 54
across the
differential outputs, the driver can maintain
greater than +1.5V voltage levels.
The drivers of the SP3486 feature active HIGH
and active LOW common driver enable
controls. Refer to SP3486 Truth Table in Table
1. The SP3487 provides independent, active
high driver enable controls for each pair of
drivers. Refer to SP3487 Truth Table in Table 2.
The driver outputs are short-circuit limited
to 250mA. The SP3486 and SP3487 drivers
meet the electrical specifications of RS-485
and RS-422 serial protocols up to 10Mbps
under load.
10/15/02 SP3486/3487 Low Power Quad RS485/422 Line Drivers
Copyright 2000 Sipex Corporation
6
Figure 6. Driver Enable and Disable Timing Waveforms
Figure 5. Driver Propagation Delay Waveforms
0V
V
OH
t
PLH
t
PHL
V
OM
t
PHL
t
PLH
3V
V
OL
V
OH
1.5V
1.5V
INPUT
Y OUTPUT
V
OM
Z OUTPUT
V
OL
V
OM
V
OM
V
OM
= V
OH
+ V
OL
2
1.5V
0V
V
OH
t
PZH
0.25V
t
PHZ
V
OM
t
PZL
t
PLZ
3V
V
OL
V
CC
1.5V
1.5V
INPUT
OUTPUT
HIGH
V
OM
0.25V
0V
OUTPUT
LOW
V
OM
= V
OH
+ V
OL
2
1.5V
NOTE 1: The input pulse is supplied by a generator with the following characteristics:
INPUT=250kHz, 50% duty cycle, t
r
< 6.0ns, Z
o
=50
.
NOTE 2: C
L
includes probe and stray capacitance.
10/15/02
SP3486/3487 Low Power Quad RS485/422 Line Drivers
Copyright 2002 Sipex Corporation
7
D
ALTERNATE
END PINS
(BOTH ENDS)
D1 = 0.005" min.
(0.127 min.)
E
PACKAGE: PLASTIC
DUALINLINE
(NARROW)
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
A = 0.210" max.
(5.334 max).
E1
C
L
A2
A1 = 0.015" min.
(0.381min.)
B
B1
e = 0.100 BSC
(2.540 BSC)
e
A
= 0.300 BSC
(7.620 BSC)
A2
B
B1
C
D
E
E1
L
16PIN
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
0.780/0.800
(19.812/20.320)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
10/15/02 SP3486/3487 Low Power Quad RS485/422 Line Drivers
Copyright 2000 Sipex Corporation
8
D
E
H
PACKAGE: PLASTIC
SMALL OUTLINE (SOIC)
(WIDE)
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
A
A1
L
B
e
A
A1
B
D
E
e
H
L
16PIN
0.093/0.104
(2.352/2.649)
0.004/0.012
(0.102/0.300)
0.013/0.020
(0.330/0.508)
0.398/0.413
(10.10/10.49)
0.291/0.299
(7.402/7.600)
0.050 BSC
(1.270 BSC)
0.394/0.419
(10.00/10.64)
0.016/0.050
(0.406/1.270)
0/8
(0/8)
10/15/02
SP3486/3487 Low Power Quad RS485/422 Line Drivers
Copyright 2002 Sipex Corporation
9
ORDERING INFORMATION
Quad RS485 Drivers:
Model ..................................................... Enable/Disable .......................................... Temperature Range ......................................... Package
SP3486CP .......................... Common; active Low and Active High ............................. 0
C to +70
C ..................................... 16pin Plastic DIP
SP3486CT ........................... Common; active Low and Active High ............................. 0
C to +70
C .............................................. 16pin SOIC
SP3486EP ........................... Common; active Low and Active High ........................... 40
C to +85
C .................................. 16pin Plastic DIP
SP3486ET ........................... Common; active Low and Active High ........................... 40
C to +85
C ........................................... 16pin SOIC
SP3487CP ............................... One per driver pair; active High ................................... 0
C to +70
C ..................................... 16pin Plastic DIP
SP3487CT ................................ One per driver pair; active High ................................... 0
C to +70
C .............................................. 16pin SOIC
SP3487EP ................................ One per driver pair; active High ................................ 40
C to +85
C .................................. 16pin Plastic DIP
SP3487ET ................................ One per driver pair; active High ................................ 40
C to +85
C ........................................... 16pin SOIC
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
Corporation
SIGNAL PROCESSING EXCELLENCE
Please consult the factory for pricing and availability on a Tape-On-Reel option.
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
PDF 
ZIP