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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 specications
of RS-485 and RS-422. Their BiCMOS design allows low power operation without sacricing
performance. The SP485 meets the requirements of RS-485 and RS-422 up to 5Mbps. Additionally, 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 • 510-668-7017 • www.exar.com SP483_SP485_100_071410
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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 specications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability.
VCC......................................................................+12V
Input Voltages
Logic.........................-0.3V to (Vcc + 0.5V)
Drivers......................-0.3V to (Vcc + 0.5V)
Receivers.........................................+/-15V
Output Voltages
Logic.........................-0.3V to (Vcc + 0.5V)
Drivers.............................................+/-15V
Receivers..................-0.3V to (Vcc + 0.5V)
Storage Temperature.......................-65˚C to +150˚C
Power Dissipation
8-pin NSOIC...................................................500mW
T
to T
and VCC = 5V +/-5% unless otherwise noted.
MIN
MAX
ELECTRICAL CHARACTERISTICS
PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS
SP483/SP485 DRIVER
DC Characteristics
Differential Output Voltage Vcc Volts Unloaded; R = ∞ ; see gure 1
Differential Output Voltage 2 Vcc Volts With Load; R = 50Ω (RS-422);
see figure 1
Differential Output Voltage 1.5 Vcc Volts With Load; R = 27Ω (RS-485);
see figure 1
Change in Magnitude of Driver
0.2 Volts R = 27Ω or R = 50Ω; see figure 1
Differential Output Voltage for
Complimentary states
Driver Common Mode Output
3 Volts R = 27Ω or R = 50Ω; see figure 1
Voltage
Input High Voltage 2.0 Volts Applies to DE, DI, RE
Input Low Voltage 0.8 Volts Applies to DE, DI, RE
Input Current +/-10 µA Applies to DE, DI, RE
Driver Short Circuit Current,
V
= HIGH
OUT
Driver Short Circuit Current,
V
= LOW
OUT
35 250 mA -7V ≤ VO ≤ +12V
35 250 mA -7V ≤ VO ≤ +12V
SP485 DRIVER
AC Characteristics
Maximum Data Rate 5 Mbps RE = 5V, DE = 5V
Driver Input to Output, t
Driver Input to Output, t
PLH
PHL
30 60 ns Figures 3 and 5, R
CL1 = CL2 = 100pF
30 60 ns Figures 3 and 5, R
CL1 = CL2 = 100pF
= 54Ω,
DIFF
= 54Ω,
DIFF
Driver Skew 5 10 ns Figures 3 and 5,
t
= |t
- t
SKEW
DPHL
Driver Rise or Fall Time 15 40 ns From 10%-90%; R
CL1 = CL2 = 100pF; see gures 3
DPLH
|
DIFF
= 54Ω
and 5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP483_485_100_071410
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T
to T
and VCC = 5V +/-5% unless otherwise noted.
MIN
MAX
ELECTRICAL CHARACTERISTICS
PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS
SP485 DRIVER (continued)
AC Characteristics
Driver Enable to Output High 40 70 ns CL = 100pF, see gures 4 and 6,
S2 closed
Driver Enable to Output Low 40 70 ns CL = 100pF, see gures 4 and 6,
S1 closed
Driver Disable Time from High 40 70 ns CL = 15pF, see gures 2 and 8,
S2 closed
Driver Disable Time from Low 40 70 ns CL = 15pF, see gures 2 and 8,
S1 closed
SP483/SP485 RECEIVER
DC Characteristics
Differential Input Threshold -0.2 +0.2 Volts -7V ≤ VCM ≤ +12V
Input Hysteresis 10 mV VCM = 0V
Output Voltage High 2.4 5 Volts IO = -4mA, VID = +200mV
Output Voltage Low 0.0 0.4 Volts IO = +4mA, VID = -200mV
Three-State ( High Impedance)
+/-1 µA 0.4V ≤ VO ≤ 2.4V; RE = 5V
Output Current
Input Resistance 15 kΩ -7V ≤ VCM ≤ +12V
Input Current (A, B); VIN = 12V +1.0 mA DE = 0V, VCC = 0V or 5.25V,
VIN = 12V
Input Current (A, B); VIN = -7V -0.8 mA DE = 0V, VCC = 0V or 5.25V,
VIN = -7V
Short-Circuit Current 95 mA 0V ≤ VCM ≤ V
CC
SP485 RECEIVER
AC Characteristics
Maximum Data Rate 5 Mbps RE = 0V, DE = 0V
Receiver Input to Output 60 90 200 ns t
Receiver Input to Output 60 90 200 ns t
Differential Receiver Skew
|t
- t
|
PHL
PLH
13 ns R
Figures 3 and 7,
PLH ;
R
= 54Ω, CL1 = CL2 = 100pF
DIFF
Figures 3 and 7,
PHL ;
R
= 54Ω, CL1 = CL2 = 100pF
DIFF
= 54Ω, CL1 = CL2 = 100pF,
DIFF
Figures 3 and 7
Receiver Enable to Output Low 20 50 ns CRL = 15pF, Figures 2 and 8;
S1 Closed
Receiver Enable to Output High 20 50 ns CRL = 15pF, Figures 2 and 8;
S2 Closed
Receiver Disable from LOW 20 50 ns CRL = 15pF, Figures 2 and 8;
S1 Closed
Receiver Disable from High 20 50 ns CRL = 15pF, Figures 2 and 8;
S2 Closed
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP483_SP485_100_071410
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T
to T
and VCC = 5V +/-5% unless otherwise noted.
MIN
MAX
ELECTRICAL CHARACTERISTICS
PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS
POWER REQUIREMENTS
Supply Voltage V
CC
+4.75 +5.25 Volts
Supply Current
SP485 900 µA No Load; RE, DI = 0V or VCC;
DE = V
CC
900 µA No Load; RE = 0V, DI = 0V or 5V;
DE = 0V
SP483 600 µA No Load; RE, DI = 0V or VCC;
DE = V
CC
600 µA No Load; RE = 0V, DI = 0V or 5V;
DE = 0V
SP483 10 µA Shutdown Mode; DE = 0V, RE = V
ENVIRONMENTAL AND MECHANICAL
Operating Temperature
Commercial (_C_) 0 70 ºC
Industrial (_E_) -40 +85 ºC
Storage Temperature -65 +150 ºC
Package: Plastic DIP (_P), NSOIC (_N)
CC
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP483_485_100_071410
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T
to T
and VCC = 5V +/-5% unless otherwise noted.
MIN
MAX
ELECTRICAL CHARACTERISTICS
PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS
SP483 DRIVER
AC Characteristics
Maximum Date Rate 250 kbps
Driver Input to Output, t
Driver Input to Output, t
PLH
PHL
250 800 2000 ns t
250 800 2000 ns t
; R
PLH
see gures 3 and 5
PHL
see gures 3 and 5
= 54Ω, CL1 = CL2 = 100pF,
DIFF
; R
= 54Ω, CL1 = CL2 = 100pF,
DIFF
Driver Skew 100 800 ns see gures 3 and 5,
t
= |t
- t
SKEW
DPHL
Driver Rise or Fall Time 250 2000 ns From 10%-90%; R
CL1 = CL2 = 100pF; see Figures 3
DPLH
|
DIFF
= 54Ω
and 5
Driver Enable to Output High 250 2000 ns CL = 100pF, see gures 4 and 6,
S2 closed
Driver Enable to Output Low 250 2000 ns CL = 100pF, see gures 4 and 6,
S1 closed
Driver Disable Time from High 300 3000 ns CL = 15pF, see gures 4 and 6,
S2 closed
Driver Disable Time from Low 300 3000 ns CL = 15pF, see gures 4 and 6,
S1 closed
SP483 RECEIVER
AC Characteristics
Maximum Data Rate 250 kbps
Receiver Input to Output 250 2000 ns t
Differential Receiver Skew
|t
- t
|
PHL
PLH
100 ns R
, t
; Figures 3 and 7:
PLH
PHL
R
= 54Ω, CL1 = CL2 = 100pF
DIFF
= 54Ω, CL1 = CL2 = 100pF,
DIFF
see Figures 3 and 7
Receiver Enable to Output Low 20 50 ns CRL = 15pF, Figures 2 and 8;
S1 Closed
Receiver Enable to Output High 20 50 ns CRL = 15pF, Figures 2 and 8;
S2 Closed
Receiver Disable from LOW 20 50 ns CRL = 15pF, Figures 2 and 8;
S1 Closed
Receiver Disable from High 20 50 ns CRL = 15pF, Figures 2 and 8;
S2 Closed
SP483
Shutdown Timing
Time to Shutdown 50 200 600 ns RE = 5V, DE = 0V
Driver Enable from Shutdown
to Output High
Driver Enable from Shutdown
to Output Low
Receiver Enable from
Shutdown to Output High
Receiver Enable from
Shutdown to Output Low
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP483_SP485_100_071410
2000 ns CL = 100pF; See Figures 4 and 6;
S2 Closed
2000 ns CL = 100pF; See Figures 4 and 6;
S1 Closed
2500 ns CL = 15pF; See Figures 4 and 6;
S2 Closed
2500 ns CL = 15pF; See Figures 4 and 6;
S1 Closed
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PIN FUNCTION
A
B
R
R
V
OD
V
OC
C
L1
15pF
RO
A
B
A
B
DI
C
L2
R
L
500Ω
C
L
Output
Under
Test
S
1
S
2
V
CC
1kΩ
1kΩC
RL
Receiver
Output
S
1
S
2
Test Point
V
CC
+3V
0V
DRIVER INPUT
A
B
DRIVER
OUTPUT
V
O
+
DIFFERENTIAL
OUTPUT
VA – V
B
0V
V
O
–
1.5V 1.5V
t
PLH
t
F
t
R
f
SP485
= 1MHz; t
R
≤ 10ns ; tF ≤ 10ns
V
O
1/2V
O
1/2V
O
t
PHL
t
SKEW
= |t
DPLH
- t
DPHL
|
t
DPLH
t
DPHL
f
SP483
=
100kHz;
Pin 1 - RO - Receiver Output
Pin 2 - RE - Receiver Output Enable Active LOW
Pin 3 - DE - Driver Output Enable Active HIGH
Pin 4 - DI - Driver Input
Pin 5 - GND - Ground Connection
Pin 6 - A - Driver Output / Receiver input
Non-Inverting
Pin 7 - B - Driver Output / Receiver Input Inverting
Pin 8 - Vcc - Positive Supply 4.75V ≤ Vcc ≤ 5.25V
TEST CIRCUITS
Figure 1. Driver DC Test Load Circuit
Figure 3. RS-485 Driver/Receiver Timing Test
Figure 5. Driver Propagation Delays
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP483_485_100_071410
Figure 2. Receiver Timing Test Load Circuit
Figure 4. Driver Timing Test Load #2 Circuit
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+3V
0V
DE
5V
V
OL
A
, B
0V
1.5V 1.5V
t
ZL
t
ZH
V
OH
A
, B
2.3V
2.3V
t
LZ
t
HZ
0.5V
0.5V
Output normally LOW
Output normally HIGH
f
SP485
= 1MHz; tR≤ 10ns; tF ≤ 10ns
f
SP483
=
100kHz;
INPUTS OUTPUTS
V
OH
V
OL
R
1.5V 1.5V
t
PHL
OUTPUT
V
OD2
+
V
OD2
–
A – B
0V 0V
t
PLH
INPUT
f
SP485
= 1MHz; tR≤ 10ns; tF ≤ 10ns
f
SP483
=
100kHz;
t
SKEW
= |t
PLH
- t
PHL
|
+3V
0V
5V
0V
1.5V 1.5V
t
ZL
t
ZH
R
1.5V
1.5V
t
LZ
t
HZ
0.5V
0.5V
Output normally LOW
Output normally HIGH
V
IL
V
IH
R
RE
f
SP485
= 1MHz; tR≤ 10ns; tF ≤ 10ns
f
SP483
=
100kHz;
LINE
RE DE DI
CONDITION A B
X 1 1 No Fault 1 0
X 1 0 No Fault 0 1
X 0 X X Z Z
X 1 X Fault Z Z
Table 1. Transmit Function Truth Table
Figure 6. Driver Enable and Disable Times
FUNCTION TRUTH TABLES
INPUTS OUTPUTS
RE DE A - B R
0 0 +0.2V 1
0 0 -0.2V 0
0 0 Inputs Open 1
1 0 X Z
Table 2. Receive Function Truth Table
SWITCHING WAVEFORMS
Figure 7. Receiver Propagation Delays
Figure 8. Receiver Enable and Disable Times
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP483_SP485_100_071410
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DESCRIPTION
The SP483 and SP485 are half-duplex differential transceivers that meet the requirements of RS-485 and RS-422. Fabricated
with an Exar proprietary BiCMOS process,
this product requires a fraction of the power
of older bipolar designs.
The RS-485 standard is ideal for multi-drop
applications and for long-distance interfaces.
RS-485 allows up to 32 drivers and 32 receivers to be connected to a data bus, making it
an ideal choice for multi-drop applications.
Since the cabling can be as long as 4,000
feet, RS-485 transceivers are equipped with
a wide (-7V to +12V) common mode range
to accommodate ground potential differences. Because RS-485 is a differential
interface, data is virtually immune to noise
in the transmission line.
Drivers
SP483 and SP485
The driver outputs of the SP483 and SP485
are differential outputs meeting the RS-485
and RS-422 standards. The typical voltage
output swing with no load will be 0 Volts to
+5 Volts. With worst case loading of 54Ω
across the differential outputs, the drivers can
maintain greater than 1.5V voltage levels.
The drivers of the SP483 and SP485 have
an enable control line which is active HIGH.
A logic HIGH on DE (pin 3) will enable the
differential driver outputs. A logic LOW on the
DE(pin 3) will tri-state the driver outputs.
Receivers
SP483 and SP485
The SP483 and SP485 receivers have differential inputs with an input sensitivity as
low as ±200mV. Input impedance of the
receivers is typically 15kΩ (12kΩ minimum).
A wide common mode range of -7V to +12V
allows for large ground potential differences
between systems. The receivers of the
SP483 and SP485 have a tri-state enable
control pin. A logic LOW on RE (pin 2) will
enable the receiver, a logic HIGH on RE (pin
2) will disable the receiver.
The receiver for the SP485 will operate up
to at least 10Mbps. The SP483 receiver
is rated for data rates up to 250kbps. The
receiver for each of the three devices is
equipped with the fail-safe feature. Failsafe guarantees that the receiver output
will be in a HIGH state when the input is
left unconnected and oating.
Shutdown Mode
SP483
The SP483 is equipped with a Shutdown
mode. To enable the shutdown state, both
driver and receiver must be disabled simultaneously. A logic LOW on DE (pin 3) and a
Logic HIGH on RE (pin 2) will put the SP483
into Shutdown mode. In Shutdown, supply
current will drop to typically 1µA.
The transmitters of the SP485 will operate up
to at least 5Mbps. The SP483 has internally
slew rate limited driver outputs to minimize
EMI. The maximum data rate for the SP483
driver is 250kbps.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP483_485_100_071410
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP483_SP485_100_071410
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com SP483_485_100_071410
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Model Temperature Range Package Types
SP483CN-L ......................................................................... 0°C to +70°C ................................................................................................8-pin NSOIC
SP483CN-L/TR ...................................................................0°C to +70°C ................................................................................................8-pin NSOIC
SP483CS-L.......................................................................... 0°C to +70°C................................................................................................8-pin PDIP
SP483EN-L........................................................................ -40°C to +85°C...............................................................................................8-pin NSOIC
SP483EN-L/TR.................................................................. -40°C to +85°C...............................................................................................8-pin NSOIC
SP483ES-L........................................................................ -40°C to +85°C...............................................................................................8-pin PDIP
SP485CN-L ......................................................................... 0°C to +70°C ................................................................................................8-pin NSOIC
SP485CN-L/TR ...................................................................0°C to +70°C ................................................................................................8-pin NSOIC
SP485CS-L......................................................................... 0°C to +70°C.................................................................................................8-pin PDIP
SP485EN-L........................................................................ -40°C to +85°C...............................................................................................8-pin NSOIC
SP485EN-L/TR.................................................................. -40°C to +85°C...............................................................................................8-pin NSOIC
SP485ES-L........................................................................ -40°C to +85°C...............................................................................................8-pin PDIP
Note: /TR = Tape and Reel
REVISION HISTORY
DATE REVISION DESCRIPTION
07/28/04 -- Legacy Sipex Datasheet
ORDERING INFORMATION
07/14/10 1.0.0 Convert to Exar Format. Update ordering information as a result of discontinued
Lead type package options per PDN 081126-01. Remove all options and reference
to SP481; Part is EOL. Remove "GND" entry from Minimum column of SP483/485
driver DC Characteristic paramter "Differntial output voltage - Unloaded".
Notice
EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for
illustration purposes and may vary depending upon a user's specic application. While the information in this publication has been carefully checked;
no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can
reasonably be expected to cause failure of the life support system or to signicantly affect its safety or effectiveness. Products are not authorized for
use in such applications unless EXAR Corporation receives, in writting, assurances to its satisfaction that: (a) the risk of injury or damage has been
minimized ; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Copyright 2010 EXAR Corporation
Datasheet July 2010
Send your Interface technical inquiry with technical details to: [email protected]
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
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