®
SP486E and SP487E
Enhanced Quad RS-485/RS-422 Line Drivers
s
s
s
s
s
s
s
s
RS-485 or RS-422 Applications
Quad Differential Line Drivers
Driver Output Disable
–7V to +12V Common Mode Output
Range
100µA Supply Current
Single +5V Supply Operation
Superior Drop-in Replacement for
SN75172, SN75174, LTC486, and
LTC487
Improved ESD Specifications:
+15kV Human Body Model
+15kV IEC1000-4-2 Air Discharge
+8kV IEC1000-4-2 Contact Discharge
DESCRIPTION…
The
SP486E
and
SP487E
are low-power quad differential line drivers that meet the
specifications of RS-485 and RS-422 serial protocols with enhanced ESD performance. The
ESD tolerance has been improved on these devices to over +15kV for both Human Body
Model and IEC1000-4-2 Air Discharge Method. These devices are superior drop-in replace-
ments to
Sipex's SP486
and
SP487
devices as well as popular industry standards. As with
the original versions, the
SP486E
features a common driver enable control and the
SP487E
provides independent driver enable controls for each pair of drivers. Both feature wide
common-mode input ranges. 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
SP486E
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
SP487E
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
SP486E/487EDS/06
SP486E/487E Enhanced 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
V
CC
V
CC
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
2
1.5
R
L
= 50Ω (RS-422)
R
L
= 27Ω (RS-485)
–7V
≤V
O
≤
+12V
–7V
≤V
O
≤
+12V
V
O
= –7V to +12V
+2
5.00
0.5
0.5
+250
+250
+200
5.25
10
10
mA
mA
µA
Volts
mA
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
–_P
16–pin Plastic DIP
–_T
16–pin SOIC
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
2
PINOUT — SP486E
DI
1
DO
1
A
DO
1
B
EN
DO
2
B
DO
2
A
DI
2
GND
1
SP486E
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.
SP486E 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
SP486E
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
SP486E
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.
Pin 16 — Supply Voltage V
CC
— 4.75V
≤
V
CC
≤
5.25V.
A
R
V
DO
R
B
Figure 1. Driver DC Test Load
SP486E/487EDS/06
EN
C
L1
A
DI
DRIVER
B
EN
Figure 2. Driver Timing Test
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
R
DIFF
V
OC
C
L2
3
PINOUT — SP487E
DI
1
DO
1
A
DO
1
B
EN
1
/EN
2
DO
2
B
DO
2
A
DI
2
GND
1
INPUT
DI
SP487E
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. SP486E Truth Table
3
8
9
Pin 11 — DO
3
B — Driver 3 output B.
SP487E 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
SP487E
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.
Pin 12 — EN
3
/EN
4
— Driver 3 and 4 Output
Enable. Please refer to
SP487E
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
SP486E
and
SP487E
are low–power quad
differential line drivers meeting RS-485 and
RS-422 standards. The
SP486E
features active
high and active low common driver enable
controls; the
SP487E
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 available 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. SP487E Truth Table
SP486E/487EDS/06
SP486E/487E Enhanced 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
1
2
V
O
V
O
–V
O
t
r
Figure 4. Driver Propagation Delays
V
DIFF
= V(A) – V(B)
90%
10%
90%
10%
t
f
AC PARAMETERS
V
CC
= 5V±5%; typicals at 25°C; T
AMB
= 25°C unless otherwise noted.
PARAMETER
PROPAGATION DELAY
Driver Input to Output
Low to High (t
PLH
)
High to Low (t
PHL
)
Differential Skew (t
SKEW
)
Driver Rise Time (t
R
)
SP486E
SP487E
Driver Fall Time (t
F
)
SP486E
SP487E
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
ns
ns
t
SKEW
= t
PLH
- t
PHL
10% to 90%
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
SP486E/487EDS/06
SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers
© Copyright 2000 Sipex Corporation
5
Embedded System
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