SP3483
3.3V Low Power Slew Rate Limited
Half-Duplex RS-485 Transceiver
Description
The SP3483 device is part of a family of 3.3V low power halfduplex transceivers that meet the specifications of the RS-485 and
RS-422 serial protocols. This device is pin-to-pin compatible with the
MaxLinear SP483 device as well as popular industry standards. The
SP3483 features MaxLinear’s BiCMOS design allowing low power
operation without sacrificing performance. The SP3483 is slew rate
limited to reduce EMI and can meet the requirements of the RS-485
and RS-422 protocols up to 250kbps.
FEATURES
■■ RS-485 and RS-422 transceiver
■■ Operates from a single 3.3V Supply
■■ Interoperable with 5.0V logic
■■ Driver/receiver enable
■■ Low power shutdown mode
■■ -7V to +12V common-mode input voltage
range
■■ Allows up to 32 transceivers on the serial
bus
■■ Compatibility with the industry standard
75176 pinout
■■ Driver output short-circuit protection
■■ Slew rate limited driver for low EMI
Ordering Information - Back Page
Block Diagram
R
RO 1
8 VCC
RE 2
7 B
DE 3
6 A
DI 4
D
5 GND
SP3483
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SP3483
Absolute Maximum Ratings
Operating Conditions
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.
Package Power Dissipation
VCC................................................................................ 6.0V
Input Voltages
8-pin NSOIC ѲJA................................................. 128.4˚C/W
ESD Rating
Human Body Model (HBM)........................................... ±2kV
Logic...................................... -0.3V to 6.0V
Drivers................................... -0.3V to 6.0V
Receivers............................................ ±15V
Output Voltages
Drivers................................................ ±15V
Receivers............................... -0.3V to 6.0V
Storage Temperature..................................-65˚C to +150˚C
Maximum Junction Temperature, TJ...........................125˚C
Power Dissipation
8-pin NSOIC............................................................. 500mW
(derate 6.14mW/°C above +70°C)
Electrical Characteristics
TAMB = TMIN to TMAX and VCC = 3.3V ±5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS
CONDITIONS
Vcc
V
Unloaded; R = ∞Ω ; Figure 1
SP3483 Driver DC Characteristics
Differential output voltage
Differential output voltage
2
Vcc
V
With Load; R = 50Ω (RS-422); Figure 1
Differential output voltage
1.5
Vcc
V
With Load; R = 27Ω (RS-485); Figure 1
0.2
V
R = 27Ω or R = 50Ω; Figure 1
3
V
R = 27Ω or R = 50Ω; Figure 1
V
Applies to DE, DI, RE
Change in magnitude of driver
differential output voltage for
complimentary states
Driver common-mode output voltage
Input high voltage
2.0
Input low voltage
0.8
V
Applies to DE, DI, RE
Input current
±10
µA
Applies to DE, DI, RE
Driver short circuit current
VOUT = HIGH
±250
mA
-7V ≤ VO ≤ +12V; Figure 8
Driver short circuit current
VOUT = LOW
±250
mA
-7V ≤ VO ≤ +12V; Figure 8
SP3483 Driver AC Characteristics
Maximum data rate
250
kbps
Driver input to output, tPLH
400
900
1500
ns
Figures 2 & 9
Driver input to output, tPHL
400
900
1500
ns
Figures 2 & 9
ns
|tDO1- tDO2|, Figures 2 and 10
ns
From 10%-90%; Figures 3 and 10
Differential driver skew
10
Driver rise or fall time
700
1000
REV 1.0.1
RE = VCC, DE = VCC
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SP3483
Electrical Characteristics (Continued)
TAMB = TMIN to TMAX and VCC = 3.3V ±5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS
CONDITIONS
Driver enable to output high
700
1300
ns
Figures 4 and 11
Driver enable to output low
690
1300
ns
Figures 5 and 11
Driver disable time from high
80
120
ns
Figures 5 and 11
Driver disable time from low
90
120
ns
Figures 4 and 11
0.2
Volts
-7V ≤ VCM ≤ 12V
SP3483 Driver AC Characteristics (Continued)
SP3483 Receiver DC Characteristics
Differential input threshold
-0.2
Input hysteresis
Output voltage HIGH
20
mV
Vcc-0.4
VCM = 0V
Volts
VID = 200mV, IO = -1.5mA
Output voltage LOW
0.4
Volts
VID = -200mV, IO = 2.5mA
Three-state (high impedance)
output current
±1
µA
0V ≤ VO ≤ VCC; RE = VCC
kΩ
-7V ≤ VCM ≤ 12V
Input resistance
12
15
Input current (A, B); VIN = 12V
1.0
mA
DE = 0V, VCC = 0V or 3.6V, VIN = 12V
Input current (A, B); VIN = -7V
-0.8
mA
DE = 0V, VCC = 0V or 3.6V, VIN = -7V
60
mA
0V ≤ VCM ≤ VCC
Short circuit current
7
SP3483 Receiver AC Characteristics
Maximum data rate
250
Receiver input to output, tRPLH
35
70
Receiver input to output, tRPHL
35
70
kbps
RE = 0V, DE = 0V
120
ns
Figures 6 and 12
120
ns
Figures 6 and 12
ns
tRSKEW = |tRPHL- tRPLH|, Figures 6 and 12
Differential receiver skew
50
Receiver enable to output low
45
70
ns
Figures 7 and 13, S1 closed, S2 open
Receiver enable to output high
45
70
ns
Figures 7 and 13, S2 closed, S1 open
Receiver disable from low
45
70
ns
Figures 7 and 13, S1 closed, S2 open
Receiver disable from high
45
70
ns
Figures 7 and 13, S2 closed, S1 open
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SP3483
Electrical Characteristics (Continued)
TAMB = TMIN to TMAX and VCC = 3.3V ±5% unless otherwise noted
PARAMETERS
MIN.
TYP.
MAX.
UNITS
CONDITIONS
50
200
600
ns
RE = 5V, DE =0V
Driver enable from shutdown to
output high
2000
ns
Figures 4 and 11
Driver enable from shutdown to
output low
2000
ns
Figures 5 and 11
Receivers enabled from shutdown to
output high
2500
ns
Figures 7 and 13, S2 closed, S1 open
Receivers enabled from shutdown to
output low
2500
ns
Figures 7 and 13, S1 closed, S2 open
SP3483 Shutdown Timing
Time to shutdown
Power Requirements
Supply current, no load
1000
2000
µA
RE, DI = 0V or VCC ; DE = VCC
Supply current, no load
800
1500
µA
RE = 0V, DI = 0V or VCC, DE = 0V
10
µA
DE = 0V, RE = VCC
Shutdown mode
Pin Functions
Pin Number
Pin Name
Description
1
RO
Receiver output
8 VCC
2
RE
Receiver Output Enable Active LOW
RE 2
7 B
3
DE
Driver Output Enable Active HIGH
4
DI
Driver Input
DE 3
6 A
5
GND
Ground Connection
6
A
Non-Inverting Driver Output /
Receiver Input
7
B
Inverting Driver Output /
Receiver Input
8
VCC
Positive Supply
R
RO 1
DI 4
D
5 GND
SP3483
Pinout (Top View)
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SP3483
Test Circuits
V DM
R L = 27Ω
R
S1
D
VOD
D
GENERATOR
(NOTE 1)
R
Vcc
OUT
50Ω
C L = 15pF
(NOTE 2)
V CC
VOC
V OM = VOH + VOL ≈ 1.5V
2
Figure 1. Driver DC Test Load Circuit
Figure 2. Driver Propagation Delay Test Circuit
S1
D
CL
RL =
OUT
60Ω
D
GENERATOR
(NOTE 1)
50Ω
OUT
R L = 110Ω
C L = 50pF
(NOTE 2)
GENERATOR
(NOTE 1)
VCC
50Ω
VOM = VOH + VOL ≈ 1.5V
2
C L = 15pF (NOTE 2)
Figure 3. Driver Differential Output Delay and
Transition Time Circuit.
Figure 4. Driver Enable and Disable Timing Circuit,
Output High
VCC
S1
0V OR 3V
V ID
R L = 110Ω
D
GENERATOR
(NOTE 1)
OUT
R
OUT
50Ω
C L = 15pF
(NOTE 2)
C L = 50pF
(NOTE 2)
GENERATOR
(NOTE 1)
50Ω
1.5V
VOM = VCC
2
0V
Figure 5. Driver Enable and Disable Timing Circuit,
Output Low
S1
S3
1.5V
VCC
1k
-1.5V
Figure 6. Receiver Propagation Delay Test Circuit
VID
R
S2
DE = 0 or Vcc
DI = 0 or Vcc
C L = 15pF
(NOTE 2)
GENERATOR
(NOTE 1)
A/Y
B/Z
50Ω
IOSD
D
100Ω
-7V to +12V V
Figure 7. Receiver Enable and Disable Timing Circuit
Figure 8. Driver Short Circuit Current Limit Test
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SP3483
Switching Waveforms
3V
3V
INPUT
1.5V
1.5V
tPLH
tPHL
IN
1.5V
1.5V
0V
VOH
t DO1
VOM
VOM
A OUTPUT
0V
t DO2
VOL
tPHL
VOH
B OUTPUT
tPLH
50%
10%
OUT
VOM
VOM
90%
90%
2.0V
50%
10%
-2.0V
VOL
t TD
VOM
t TD
= VOH + VOL » 1.5V
2
Figure 9. Driver Propagation Delay Waveforms
Figure 10. Driver Differential Output Delay and
Transition Time Waveforms
3V
1.5V
1.5V
DE
0V
OUTPUT
HIGH
OUTPUT
LOW
tPHZ
tPZH
VOH
3V
0.25V
VOM
INPUT
0V
0V
tPZL
VCC
tPLZ
VOM
VCC
0V
VOH
OUTPUT
Figure 12. Receiver Propagation Delay Waveforms
3V
1.5V
tPRHZ
10%
VOM
VOM = VCC
2
S1 is open
S2 is closed
S3 = 1.5V
1.5V
tRPHL
0V
Figure 11. Driver Enable and Disable Timing Waveforms
RE
tRPLH
VOM
VOM = VOH + VOL ≈ 1.5V
2
3V
1.5V
OUTPUT
0.25V
VOL
1.5V
S1 is closed
S2 is open
S3 = -1.5V
1.5V
1.5V
RE
0V
tPRZH
tPRSH
tPRLZ
VCC
1.5V
OUTPUT
1.5V
VOL
0V
tPRZL
tPRSL
10%
Figure 13. Receiver Enable and Disable Waveforms
NOTES
1: The input pulse is supplied by a generator with the following characteristics:
PRR = 250kHz, 50% duty cycle, tR < 6.0ns, ZO = 50Ω.
2: CL includes probe and stray capacitance.
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SP3483
Description
The SP3483 device is part of a family of 3.3V low power
half-duplex transceivers that meet the specifications of the
RS-485 and RS-422 serial protocols. This device is pinto-pin compatible with the MaxLinear SP483 device as
well as popular industry standards. The SP3483 features
MaxLinear’s BiCMOS process allowing low power operation
without sacrificing performance.
Shutdown Mode
The SP3483 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 SP3483 into
Shutdown mode. In Shutdown, supply current will drop to
typically 1µA, 10µA maximum.
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 RS485 is a differential interface, data is virtually immune to
noise in the transmission line.
Drivers
The driver outputs of the SP3483 are differential outputs
meeting the RS-485 and RS-422 standards. The typical
voltage output swing with no load will be 0 Volts to 3.3
Volts. With worst case loading of 54Ω across the differential
outputs, the drivers can maintain greater than 1.5V voltage
levels. The drivers 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 force the driver outputs into high impedance (high-Z).
The SP3483 has internally slew rate limited driver outputs to
minimize EMI. The transceivers will operate up to 250kbps.
The 250mA ISC maximum limit on the driver output allows
the SP3483 to withstand an infinite short circuit over the
-7.0V to 12V common mode range without catastrophic
damage to the IC.
INPUTS
OUTPUTS
RE
DE
DI
LINE
CONDITION
B
A
X
1
1
No Fault
0
1
X
1
0
No Fault
1
0
X
0
X
X
Z
Z
Table 1. Transmit Function Truth Table
INPUTS
OUTPUTS
RE
DE
A-B
R
0
0
0
0.2V
1
0
-0.2V
0
0
0
Inputs Open
1
1
0
X
Z
Table 2. Receive Function Truth Table
Receivers
The SP3483 receiver has 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 receiver of the
SP3483 has a tri-state enable control input RE (Pin 2). A
logic LOW on RE will enable the receiver, a logic HIGH on
RE will disable the receiver.
The receiver of the SP3483 will operate up to 250kbps. The
receiver is equipped with the fail-safe feature. Fail-safe
guarantees that the receiver output will be in a HIGH state
when the input is left unconnected (open circuit).
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SP3483
Mechanical Dimensions
NSOIC8
Top View
Front View
Side View
Drawing No:
Revision:
REV 1.0.1
POD-00000108
A
8/9
SP3483
Ordering Information(1)
Part Number
Operating Temperature Range
SP3483CN-L
Lead-Free
Package
Tube
0°C to 70°C
SP3483CN-L/TR
Yes(2)
SP3483EN-L
-40°C to 85°C
SP3483EN-L/TR
Packaging Method
8-pin NSOIC
Reel
Tube
Reel
NOTE:
1. Refer to www.exar.com/SP3483 for most up-to-date Ordering Information.
2. Visit www.exar.com for additional information on Environmental Rating.
Revision History
Revision
Date
06/23/04
--
01/09/12
1.0.0
Convert to Exar Format. Update ordering information as a result of discontinued Lead type
package options. Add new Figure 8 - Driver Short Circuit Current Limit Test Circuit. Correct
type error for no load supply current.
09/07/17
1.0.1
Update to MaxLinear logo. Remove GND from Differential Output Voltage min (page 2).
Added maximum junction temperature, package power dissipation and ESD rating. Update
format and ordering information table. Truth Tables moved to page 7 description section.
Corporate Headquarters:
5966 La Place Court
Suite 100
Carlsbad, CA 92008
Tel.:+1 (760) 692-0711
Fax: +1 (760) 444-8598
www.maxlinear.com
Description
Legacy Sipex Datasheet
High Performance Analog:
48720 Kato Road
Fremont, CA 94538
Tel.: +1 (510) 668-7000
Fax: +1 (510) 668-7001
Email: serial techsupport@exar.com
www.exar.com
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