SP486/SP487
Quad RS-485/RS-422 Line Drivers
• RS-485 or RS-422 Applications
• Quad Differential Line Drivers
• Tri-state Output Control
• 40ns Typical Driver Propagation Delays
• 5ns Skew
• -7V to +2V Common Mode Output Range
• 00µA Supply Current
• Single +5V Supply Operation
• Pin Compatible with SN7572, SN7574, 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
independent driver enable controls for each pair of drivers. Both feature tri-state outputs
and a wide common-mode output range. SP486 and SP487 are available in a 6-pin SOIC
package.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP486_487_00_066
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.
V
CC
........................................................................+7V
Input Voltages
Logic..........................-0.5V to (Vcc + 0.5V)
Drivers.......................-0.5V to (Vcc + 0.5V)
Driver Output Voltage.......................................+/-4V
Input Currents
Logic..............................................+/-25mA
Driver.............................................+/-25mA
Storage Temperature........................-65˚C to +150˚C
Power Dissipation
Plastic DIP......................................................375mW
(derate 7mW/ºC above +70ºC)
Small Outline..................................................375mW
(derate 7mW/ºC above +70ºC)
V
CC
= +5.0V +/-5%; typicals at 25°C; T
MIN
≤
T
AMB
≤
T
MAX
unless otherwise noted.
ELECTRICAL CHARACTERISTICS
UNITS
CONDITIONS
DI, EN, EN, EN
/EN
2
, EN
3
/EN
4
PARAMETERS
DC CHARACTERISTICS
DIGITAL INPUTS
Voltage V
IL
Voltage V
IH
Input Current
DRIVER OUTPUTS
Differential Voltage
Differential Voltage
Differential Voltage
Change in Output Magnitude
for Complementary Output
state
Common Mode Output Voltage
Change in Common Mode
Output Magnitude for
Complementary Output state
Driver Short Circuit Current V
OH
Driver Short Circuit Current V
OL
High Impedance Output
Current
POWER REQUIREMENTS
Supply Voltage
Supply Current
Supply Current
MIN.
TYP.
MAX.
0.8
2.0
+/-2
5
2
.5
2
5
0.2
Volts
Volts
µA
Volts
Volts
Volts
Volts
V
IN
= 0V to V
CC
I
O
= 0; unloaded
R
L
= 50Ω (RS-422); Figure 1
R
L
= 27Ω (RS-485); Figure 1
R
L
= 27Ω or 50Ω; Figure 1
2.3
3
0.2
Volts
Volts
R
L
= 27Ω or 50Ω; Figure 1
R
L
= 27Ω or 50Ω; Figure 1
+/-250
+/-250
+/-2
+/-200
mA
mA
µA
-7V ≤ V
O
≤ +10V
-7V ≤ V
O
≤ +10V
V
O
= -7V to +0V
4.75
0.5
0.
5.25
0
0
Volts
µA
µA
No load, output enabled
No load, output disabled
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP486_487_00_066
2
V
CC
= +5.0V +/-5%; typicals at 25°C; T
MIN
≤
T
AMB
≤
T
MAX
unless otherwise noted.
ELECTRICAL CHARACTERISTICS
UNITS
°C
°C
°C
CONDITIONS
PARAMETERS
Operating Temperature, _C
Operating Temperature, _E
Storage Temperature
Package -_T
AC CHARACTERISTICS
Maximum Data Rate
Propagation Delay, t
PLH
Propagation Delay, t
PHL
Differential Driver Skew
Driver Rise Time (t
R
)
Driver Fall Time (t
F
)
Driver Enable to output High
Driver Enable to output Low
Driver Disable from output High
Driver Disable from output Low
MIN.
0
-40
-65
TYP.
MAX.
+70
+85
+50
ENVIRONMENTAL AND MECHANICAL
6-pin SOIC
0
20
20
40
40
5
20
20
60
60
60
60
0
5
30
30
60
60
5
Mbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
R
DIFF
= 54 ohms, C
L
= C
L2
= 00pF;
Figure 2
R
DIFF
= 54 ohms, C
L
= C
L2
= 00pF;
Figure 2
R
DIFF
= 54 ohms, C
L
= C
L2
= 00pF;
Figure 2
0% to 90%
90% to 0%
C
L
= 00pF, Figures 3 and 5
(S2 closed)
C
L
= 00pF, Figures 3 and 5
(S closed)
C
L
= 5pF, Figures 3 and 5
(S2 closed)
C
L
= 5pF, Figures 3 and 5
(S closed)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP486_487_00_066
3
PIN FUNCTION
SP486
Pin Function SP486
Pin - DI
- Driver Input - If driver output is
enabled, a logic 0 on DI
forces driver output DO
A
low and DO
B high. A logic on DI
with driver
output enabled forces driver DO
A high and DO
B
low.
Pin 2 - DO
A - Driver output A.
Pin 3 - DO
B - Driver output B.
Pin 4 - EN - Driver Output Enable; Please refer to
SP486 truth table ().
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, a logic 0 on DI
2
forces driver output DO
2
A
low and DO
2
B high. A logic on DI
2
with driver 2
output enabled forces driver DO
2
A high and DO
2
B
low.
Pin 8 - GND - Ground.
Pin 9 - DI
3
- Driver 3 Input - If driver 3 output is
enabled, a logic 0 on DI
forces driver output DO
3
A
low and DO
3
B high. A logic on DI
3
with driver 3
output enabled forces driver DO
3
A high and DO
3
B
low.
Pin 0 - DO
3
A - Driver 3 output A.
Pin - DO
3
B - Driver 3 output B.
Pin 2 - EN - Driver Output Disable; Please refer to
SP486 truth table ().
Pin 3 - DO
4
B - Driver 4 output B.
Pin 4 - DO
4
A - Driver 4 output A.
Pin 5 - DI
4
- Driver 4 Input - If driver 4 output is
enabled, a logic 0 on DI
4
forces driver output DO
4
A
low and DO
4
B high. A logic on DI
4
with driver 4
output enabled forces driver DO
4
A high and DO
4
B
low.
Pin 16 - Supply Voltage - +4.75V ≤ Vcc ≤ +5.25V.
SP486_487_00_066
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
4
PIN FUNCTION
SP487
Pin Function SP487
Pin - DI
- Driver Input - If driver output is
enabled, a logic 0 on DI
forces driver output DO
A
low and DO
B high. A logic on DI
with driver
output enabled forces driver DO
A high and DO
B
low.
Pin 2 - DO
A - Driver output A.
Pin 3 - DO
B - Driver output B.
Pin 4 - EN
/EN
2
- Driver 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, a logic 0 on DI
2
forces driver output DO
2
A
low and DO
2
B high. A logic on DI
2
with driver 2
output enabled forces driver DO
2
A high and DO
2
B
low.
Pin 8 - GND - Ground.
Pin 9 - DI
3
- Driver 3 Input - If driver 3 output is
enabled, a logic 0 on DI
forces driver output DO
3
A
low and DO
3
B high. A logic on DI
3
with driver 3
output enabled forces driver DO
3
A high and DO
3
B
low.
Pin 0 - DO
3
A - Driver 3 output A.
Pin - DO
3
B - Driver 3 output B.
Pin 2 - EN
3
/EN
4
- Driver 3 and 4 Output Enable;
Please refer to SP487 truth table (2)..
Pin 3 - DO
4
B - Driver 4 output B.
Pin 4 - DO
4
A - Driver 4 output A.
Pin 5 - DI
4
- Driver 4 Input - If driver 4 output is
enabled, a logic 0 on DI
4
forces driver output DO
4
A
low and DO
4
B high. A logic on DI
4
with driver 4
output enabled forces driver DO
4
A high and DO
4
B
low.
Pin 16 - Supply Voltage - +4.75V ≤ Vcc ≤ +5.25V.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP486_487_00_066
5
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