1
SP486/487
Quad RS-485/RS-422 Line Drivers
Copyright 2000 Sipex Corporation
DESCRIPTION...
The SP486 and SP487 are lowpower quad differential line drivers meeting RS-485 and RS-422
standards. The SP486 features a common driver enable control; the SP487 provides indepen-
dent driver enable controls for each pair of drivers. Both feature tristate outputs and wide
commonmode input range. Both are available in 16pin plastic DIP and SOIC packages.
s
RS-485 or RS-422 Applications
s
Quad Differential Line Drivers
s
Tristate Output Control
s
40ns Typical Driver Propagation
Delays
s
5ns Skew
s
7V to +12V Common Mode Output
Range
s
100
A Supply Current
s
Single +5V Supply Operation
s
Pin Compatible with SN75172,
SN75174, LTC486, and LTC487
1
2
3
4
SP487
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
SP486
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
SP486/487
Quad RS-485/RS-422 Line Drivers
SP486/487
Quad RS-485/RS-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
............................................................................................ +7V
Input Voltages
Logic ............................................................. 0.5V to (V
CC
+0.5V)
Drivers .......................................................... 0.5V to (V
CC
+0.5V)
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
SPECIFICATIONS
V
CC
= 5V
5%; typicals at 25
C; T
MIN
T
A
T
MAX
unless otherwise noted.
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
5
Volts
I
O
= 0; unloaded
2
Volts
R
L
= 50
(RS-422)
1.5
2
5
Volts
R
L
= 27
(RS-485);
Fig.
1
Change in Output Magnitude
0.2
Volts
R
L
= 27
or 50
;
Fig. 1
for Complementary Output State
Common Mode Output Voltage
2.3
3
Volts
R
L
= 27
or 50
;
Fig. 1
Change in Common Mode Output Magnitude
0.2
Volts
R
L
= 27
or 50
;
Fig. 1
for Complementary Output State
R
L
= 50
(RS-422)
R
L
= 27
(RS-485)
Maximum Data Rate
10
Mbps
Shortcircuit Current
V
OH
250
mA
7V
V
O
+10V
V
OL
250
mA
7V
V
O
+10V
High Impedance Output Current
2
200
A
V
O
= 7V to +10V
POWER REQUIREMENTS
Supply Voltage
4.75
5.00
5.25
Volts
Supply Current
0.5
10
A
No load, output enabled
0.5
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
_S
16pin Plastic DIP
_T
16pin SOIC
3
SP486/487
Quad RS-485/RS-422 Line Drivers
Copyright 2000 Sipex Corporation
PINOUT -- SP486
1
2
3
4
SP486
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
A
B
R
DIFF
C
L1
C
L2
EN
EN
DI
DRIVER
Figure 2. Driver Timing Test
V
OC
V
DO
A
B
R
R
Figure 1. Driver DC Test Load
S
1
OUTPUT
UNDER TEST
S
2
V
CC
500 ohms
C
L
Figure 3. Driver Timing Test Load
SP486 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
SP486 Truth Table (1).
Pin 5 -- DO2B -- 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).
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 3
output enabled forces driver DO
4
A high and DO
4
B
low.
SP486/487
Quad RS-485/RS-422 Line Drivers
Copyright 2000 Sipex Corporation
4
PINOUT -- SP487
1
2
3
4
SP487
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 16 -- Supply Voltage V
CC
-- 4.75V
V
CC
5.25V.
SP487 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 SP487 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.
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.
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. SP486 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. SP487 Truth Table
Pin 11 -- DO
3
B -- Driver 3 output B.
Pin 12 -- EN
3
/EN
4
-- Driver 3 and 4 Output Enable.
Please refer to SP487 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 3
output enabled forces driver DO
4
A high and DO
4
B
low.
Pin 16 -- Supply Voltage V
CC
-- 4.75V
V
CC
5.25V.
FEATURES...
The SP486 and SP487 are lowpower quad differ-
ential line drivers meeting RS-485 and RS-422
standards. The SP486 features active high and
active low common driver enable controls; the
SP487 provides independent, active high driver
enable controls for each pair of drivers. The driver
outputs are shortcircuit limited to 200mA. Data
rates up to 10Mbps are supported. Both are avail-
able in 16pin plastic DIP and SOIC packages.
5
SP486/487
Quad RS-485/RS-422 Line Drivers
Copyright 2000 Sipex Corporation
Figure 4. Driver Propagation Delays
3V
0V
B
A
V
O
V
O
V
O
V
O
1
2
t
r
t
f
10%
90%
90%
10%
V
O
1
2
t
SKEW
t
SKEW
V
DIFF
= V(A) V(B)
F = 1MHZ: t
r
< 10ns: t
f
< 10ns
t
PLH
t
PHL
DI
1.5V
1.5V
AC PARAMETERS
V
CC
= 5V
5%; typicals at 25
C; 0
C
T
A
+70
C unless otherwise noted.
PARAMETER
MIN.
TYP.
MAX.
UNIT
CONDITIONS
PROPAGATION DELAY
Driver Input to Output
R
DIFF
= 54 Ohms, C
L1
= C
L2
=
100pF;
Figure 2
Low to High (t
PLH
)
20
40
60
ns
High to Low (t
PHL
)
20
40
60
ns
Driver Output to Output (t
SKEW
)
5
15
ns
Driver Rise Time (t
R
)
10% to 90%
SP486
20
ns
SP487
20
ns
Driver Fall Time (t
F
)
90% to 10%
SP486
20
ns
SP487
20
ns
DRIVER ENABLE
To Output High
60
110
ns
C
L
= 100pF;
Figures 3 and 5
(S
2
closed)
To Output Low
60
115
ns
C
L
= 100pF;
Figures 3 and 5
(S
1
closed)
DRIVER DISABLE
From Output Low
60
130
ns
C
L
= 15pF;
Figures 3 and 5
(S
1
closed)
From Output High
60
130
ns
C
L
= 15pF;
Figures 3 and 5
(S
2
closed)
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