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SP483 / SP485
Low Power Half-Duplex RS-485 Transceivers
FEATURES
• +5V Only
• Low Power BiCMOS
• Driver / Receiver Enable
• Slew Rate Limited Driver for Low EMI (SP483)
• Low Power Shutdown mode (SP483)
• RS-485 and RS-422 Drivers/Receivers
DESCRIPTION
The
SP483
and
SP485
are a family of half-duplex transceivers that meet the specifications
of RS-485 and RS-422. Their BiCMOS design allows low power operation without sacrificing
performance. The
SP485
meets the requirements of RS-485 and RS-422 up to 5Mbps. Ad-
ditionally, the
SP483
is equipped with a low power Shutdown mode. The
SP483
is internally
slew rate limited to reduce EMI and can meet the requirements of RS-485 and RS-422 up
to 250kbps.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP483_SP485_0_0627
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.........................-0.3V to (Vcc + 0.5V)
Drivers......................-0.3V to (Vcc + 0.5V)
Receivers.........................................+/-5V
Output Voltages
Logic.........................-0.3V to (Vcc + 0.5V)
Drivers.............................................+/-5V
Receivers..................-0.3V to (Vcc + 0.5V)
Storage Temperature.......................-65˚C to +150˚C
Power Dissipation
8-pin NSOIC...................................................500mW
T
MIN
to T
MAX
and V
CC
= 5V +/-5% unless otherwise noted.
ELECTRICAL CHARACTERISTICS
TYP.
MAX.
UNITS
CONDITIONS
PARAMETERS
SP483/SP485 DRIVER
DC Characteristics
Differential Output Voltage
Differential Output Voltage
Differential Output Voltage
Change in Magnitude of Driver
Differential Output Voltage for
Complimentary states
Driver Common Mode Output
Voltage
Input High Voltage
Input Low Voltage
Input Current
Driver Short Circuit Current,
V
OUT
= HIGH
Driver Short Circuit Current,
V
OUT
= LOW
SP485 DRIVER
AC Characteristics
Maximum Data Rate
Driver Input to Output, t
PLH
Driver Input to Output, t
PHL
Driver Skew
Driver Rise or Fall Time
MIN.
Vcc
2
.5
Vcc
Vcc
0.2
Volts
Volts
Volts
Volts
Unloaded; R = ∞ ; see figure 1
With Load; R = 50Ω (RS-422);
see figure
With Load; R = 27Ω (RS-485);
see figure
R = 27Ω or R = 50Ω; see figure 1
3
2.0
0.8
+/-0
250
250
Volts
Volts
Volts
µA
mA
mA
R = 27Ω or R = 50Ω; see figure 1
Applies to DE, DI, RE
Applies to DE, DI, RE
Applies to DE, DI, RE
-7V ≤ V
O
≤ +12V
-7V ≤ V
O
≤ +12V
5
30
30
5
5
60
60
0
40
Mbps
ns
ns
ns
ns
RE = 5V, DE = 5V
Figures 3 and 5, R
DIFF
= 54Ω,
C
L
= C
L2
= 00pF
Figures 3 and 5, R
DIFF
= 54Ω,
C
L
= C
L2
= 00pF
Figures 3 and 5,
t
SKEW
= |t
DPHL
- t
DPLH
|
From 0%-90%; R
DIFF
= 54Ω
C
L
= C
L2
= 100pF; see figures 3
and 5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP483_485_0_0627
2
T
MIN
to T
MAX
and V
CC
= 5V +/-5% unless otherwise noted.
ELECTRICAL CHARACTERISTICS
TYP.
MAX.
UNITS
CONDITIONS
PARAMETERS
SP485 DRIVER (continued)
AC Characteristics
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from High
Driver Disable Time from Low
SP483/SP485 RECEIVER
DC Characteristics
Differential Input Threshold
Input Hysteresis
Output Voltage High
Output Voltage Low
Three-State ( High Impedance)
Output Current
Input Resistance
Input Current (A, B); V
IN
= 2V
Input Current (A, B); V
IN
= -7V
Short-Circuit Current
SP485 RECEIVER
AC Characteristics
Maximum Data Rate
Receiver Input to Output
Receiver Input to Output
Differential Receiver Skew
|t
PHL
- t
PLH
|
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from LOW
Receiver Disable from High
MIN.
40
40
40
40
70
70
70
70
ns
ns
ns
ns
C
L
= 100pF, see figures 4 and 6,
S
2
closed
C
L
= 100pF, see figures 4 and 6,
S
closed
C
L
= 15pF, see figures 2 and 8,
S
2
closed
C
L
= 15pF, see figures 2 and 8,
S
closed
-0.2
0
2.4
0.0
+0.2
5
0.4
+/-
Volts
mV
Volts
Volts
µA
kΩ
-7V ≤ V
CM
≤ +12V
V
CM
= 0V
I
O
= -4mA, V
ID
= +200mV
I
O
= +4mA, V
ID
= -200mV
0.4V ≤ V
O
≤ 2.4V; RE = 5V
-7V ≤ V
CM
≤ +12V
DE = 0V, V
CC
= 0V or 5.25V,
V
IN
= 2V
DE = 0V, V
CC
= 0V or 5.25V,
V
IN
= -7V
0V ≤ V
CM
≤ V
CC
2
5
+.0
-0.8
95
mA
mA
mA
5
20
20
45
45
3
45
45
45
45
70
70
70
70
200
200
Mbps
ns
ns
ns
ns
ns
ns
ns
RE = 0V, DE = 0V
t
PLH ;
Figures 3 and 7,
R
DIFF
= 54Ω, C
L
= C
L2
= 00pF
t
PHL ;
Figures 3 and 7,
R
DIFF
= 54Ω, C
L
= C
L2
= 00pF
R
DIFF
= 54Ω, C
L
= C
L2
= 00pF,
Figures 3 and 7
C
RL
= 5pF, Figures 2 and 8;
S
Closed
C
RL
= 5pF, Figures 2 and 8;
S
2
Closed
C
RL
= 5pF, Figures 2 and 8;
S
Closed
C
RL
= 5pF, Figures 2 and 8;
S
2
Closed
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP483_SP485_0_0627
3
T
MIN
to T
MAX
and V
CC
= 5V +/-5% unless otherwise noted.
ELECTRICAL CHARACTERISTICS
TYP.
MAX.
+5.25
900
900
UNITS
Volts
µA
µA
µA
µA
0
µA
No Load; RE, DI = 0V or V
CC
;
DE = V
CC
No Load; RE = 0V, DI = 0V or 5V;
DE = 0V
No Load; RE, DI = 0V or V
CC
;
DE = V
CC
No Load; RE = 0V, DI = 0V or 5V;
DE = 0V
Shutdown Mode; DE = 0V, RE = V
CC
CONDITIONS
PARAMETERS
POWER REQUIREMENTS
Supply Voltage V
CC
Supply Current
SP485
MIN.
+4.75
SP483
600
600
SP483
ENVIRONMENTAL AND MECHANICAL
Operating Temperature
Commercial (_C_)
Industrial (_E_)
Storage Temperature
0
-40
-65
70
+85
+50
ºC
ºC
ºC
Package: Plastic DIP (_P), NSOIC (_N)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com
SP483_485_0_0627
4
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