®
SP486/487
Quad RS-485/RS-422 Line Drivers
s
s
s
s
s
s
s
s
s
RS-485 or RS-422 Applications
Quad Differential Line Drivers
Tri–state Output Control
40ns Typical Driver Propagation
Delays
5ns Skew
–7V to +12V Common Mode Output
Range
100µA Supply Current
Single +5V Supply Operation
Pin Compatible with SN75172,
SN75174, LTC486, and LTC487
DESCRIPTION…
The
SP486
and
SP487
are low–power 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 tri–state outputs and wide
common–mode input range. Both are available in 16–pin plastic DIP and SOIC packages.
DI
1
DO
1
A
DO
1
B
EN
DO
2
B
DO
2
A
DI
2
GND
1
SP486
1
16
15
V
CC
DI
4
DO
4
A
DO
4
B
EN
DO
3
B
DO
3
A
DI
3
DI
1
DO
1
A
DO
1
B
EN
1
/EN
2
DO
2
B
DO
2
A
DI
2
GND
1
SP487
1
16
15
V
CC
DI
4
DO
4
A
DO
4
B
EN
3
/EN
4
DO
3
B
DO
3
A
DI
3
2
2
4
3
4
5
6
14
13
12
11
3
4
5
6
4
14
13
12
11
2
7
10
2
7
10
3
8
9
3
8
9
SP486/487
Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
1
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
DC CHARACTERISTICS
Digital Inputs
Voltage
V
IL
V
IH
Input Current
DRIVER OUTPUTS
Differential Voltage
MIN.
TYP.
MAX.
UNIT
CONDITIONS
DI, EN, EN, EN
1
/EN
2
, EN
3
/EN
4
0.8
2.0
±2
5
2
1.5
5
0.2
3
0.2
Volts
Volts
µA
Volts
Volts
Volts
Volts
Volts
Volts
Mbps
V
IN
= 0V to V
CC
I
O
= 0; unloaded
R
L
= 50Ω(RS-422)
R
L
= 27
Ω
(RS-485);
Fig.
1
R
L
= 27
Ω
or 50
Ω
;
Fig. 1
R
L
= 27
Ω
or 50
Ω
;
Fig. 1
R
L
= 27
Ω
or 50
Ω
;
Fig. 1
2
Change in Output Magnitude
for Complementary Output State
Common Mode Output Voltage
2.3
Change in Common Mode Output Magnitude
for Complementary Output State
Maximum Data Rate
10
Short–circuit Current
V
OH
V
OL
High Impedance Output Current
POWER REQUIREMENTS
Supply Voltage
4.75
Supply Current
R
L
= 50Ω (RS-422)
R
L
= 27Ω (RS-485)
–7V
≤V
O
≤
+10V
–7V
≤V
O
≤
+10V
V
O
= –7V to +10V
±2
5.00
0.5
0.5
±250
±250
±200
5.25
10
10
mA
mA
µA
Volts
µA
µA
°C
°C
°C
No load, output enabled
No load, output disabled
ENVIRONMENTAL AND MECHANICAL
Operating Temperature
–C
0
+70
–E
–40
+85
Storage Temperature
–65
+150
Package
–_S
16–pin Plastic DIP
–_T
16–pin SOIC
SP486/487
Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
2
PINOUT — SP486
DI
1
DO
1
A
DO
1
B
EN
DO
2
B
DO
2
A
DI
2
GND
1
SP486
1
16
15
V
CC
DI
4
DO
4
A
DO
4
B
EN
DO
3
B
DO
3
A
DI
3
S
1
OUTPUT
UNDER TEST
500 ohms
C
L
S
2
V
CC
2
4
3
4
5
6
14
13
12
11
2
7
10
Figure 3. Driver Timing Test Load
3
8
9
Pin 8 — GND — Digital Ground.
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 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.
A
R
V
DO
R
B
Figure 1. Driver DC Test Load
SP486/487
EN
C
L1
A
DI
DRIVER
B
EN
Figure 2. Driver Timing Test
Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
R
DIFF
V
OC
C
L2
3
PINOUT — SP487
DI
1
DO
1
A
DO
1
B
EN
1
/EN
2
DO
2
B
DO
2
A
DI
2
GND
1
INPUT
DI
SP487
16
15
V
CC
DI
4
DO
4
A
DO
4
B
EN
3
/EN
4
DO
3
B
DO
3
A
DI
3
ENABLES
EN
H
H
X
X
L
EN
X
X
L
L
H
OUTPUTS
OUTA
H
L
H
L
Hi–Z
OUTB
L
H
L
H
Hi–Z
1
2
H
L
H
L
X
4
3
4
5
6
14
13
12
11
2
7
10
Table 1. SP486 Truth Table
3
8
9
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 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.
SP486/487
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 low–power 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 short–circuit limited to 200mA. Data
rates up to 10Mbps are supported. Both are avail-
able in 16–pin plastic DIP and SOIC packages.
INPUT
DI
H
L
X
ENABLES
EN1/EN2 or EN3/EN4
H
H
L
OUTPUTS
OUTA
H
L
Hi–Z
OUTB
L
H
Hi–Z
Table 2. SP487 Truth Table
Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
4
3V
DI
0V
t
PLH
B
A
V
O
F = 1MHZ: t
r
< 10ns: t
f
< 10ns
1.5V
t
PHL
1.5V
1
2
V
O
t
SKEW
90%
10%
1
2
V
O
t
SKEW
V
O
–V
O
t
r
Figure 4. Driver Propagation Delays
V
DIFF
= V(A) – V(B)
90%
10%
t
f
AC PARAMETERS
V
CC
= 5V±5%; typicals at 25°C; 0°C
≤
T
A
≤
+70°C unless otherwise noted.
PARAMETER
PROPAGATION DELAY
Driver Input to Output
Low to High (t
PLH
)
High to Low (t
PHL
)
Driver Output to Output (t
SKEW
)
Driver Rise Time (t
R
)
SP486
SP487
Driver Fall Time (t
F
)
SP486
SP487
DRIVER ENABLE
To Output High
To Output Low
DRIVER DISABLE
From Output Low
From Output High
MIN.
TYP.
MAX.
UNIT
CONDITIONS
R
DIFF
= 54 Ohms, C
L1
= C
L2
=
100pF;
Figure 2
20
20
40
40
5
20
20
20
20
60
60
60
60
15
ns
ns
ns
10% to 90%
ns
ns
90% to 10%
ns
ns
110
115
ns
ns
C
L
= 100pF;
Figures 3 and 5
(S
2
closed)
C
L
= 100pF;
Figures 3 and 5
(S
1
closed)
C
L
= 15pF;
Figures 3 and 5
(S
1
closed)
C
L
= 15pF;
Figures 3 and 5
(S
2
closed)
60
60
130
130
ns
ns
SP486/487
Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
5
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