SP485CS-L [EXAR]
IC TXRX RS485 HALF DUPLEX 8DIP;
| 型号： | SP485CS-L |
| 厂家： | 
EXAR CORPORATION |
| 描述： | IC TXRX RS485 HALF DUPLEX 8DIP 驱动 信息通信管理 光电二极管 接口集成电路 驱动器 |
| 文件： | 总13页 (文件大小：609K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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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 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP483_SP485_ꢀ0ꢀ_0627ꢀꢀ
ꢀ
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.
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
VCC.......................................................................+7V
Input Voltages
8-pin NSOIC...................................................500mW
Logic.........................-0.3V to (Vcc + 0.5V)
Drivers......................-0.3V to (Vcc + 0.5V)
Receivers.........................................+/-ꢀ5V
ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V +/-5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS CONDITIONS
SP483/SP485 DRIVER
DC Characteristics
Differential Output Voltage
Differential Output Voltage
Vcc
Vcc
Volts
Volts
Unloaded; R = ∞ ; see figure 1
2
With Load; R = 50Ω (RS-422);
see figure ꢀ
Differential Output Voltage
ꢀ.5
Vcc
0.2
Volts
Volts
With Load; R = 27Ω (RS-485);
see figure ꢀ
Change in Magnitude of Driver
Differential Output Voltage for
Complimentary states
R = 27Ω or R = 50Ω; see figure 1
Driver Common Mode Output
Voltage
3
Volts
R = 27Ω or R = 50Ω; see figure 1
Input High Voltage
Input Low Voltage
Input Current
2.0
Volts
Volts
µA
Applies to DE, DI, RE
Applies to DE, DI, RE
Applies to DE, DI, RE
-7V ≤ VO ≤ +12V
0.8
+/-ꢀ0
250
Driver Short Circuit Current,
VOUT = HIGH
mA
Driver Short Circuit Current,
VOUT = LOW
250
mA
-7V ≤ VO ≤ +12V
SP485 DRIVER
AC Characteristics
Maximum Data Rate
Driver Input to Output, tPLH
5
Mbps
ns
RE = 5V, DE = 5V
30
30
5
60
60
ꢀ0
40
Figures 3 and 5, RDIFF = 54Ω,
CLꢀ = CL2 = ꢀ00pF
Driver Input to Output, tPHL
Driver Skew
ns
ns
ns
Figures 3 and 5, RDIFF = 54Ω,
CLꢀ = CL2 = ꢀ00pF
Figures 3 and 5,
tSKEW = |tDPHL - tDPLH
|
Driver Rise or Fall Time
ꢀ5
From ꢀ0%-90%; RDIFF = 54Ω
CLꢀ = CL2 = 100pF; see figures 3
and 5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP483_485_ꢀ0ꢀ_0627ꢀꢀ
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ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V +/-5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS CONDITIONS
SP485 DRIVER (continued)
AC Characteristics
Driver Enable to Output High
40
40
40
40
70
70
70
70
ns
ns
ns
ns
CL = 100pF, see figures 4 and 6,
S2 closed
Driver Enable to Output Low
Driver Disable Time from High
Driver Disable Time from Low
CL = 100pF, see figures 4 and 6,
Sꢀ closed
CL = 15pF, see figures 2 and 8,
S2 closed
CL = 15pF, see figures 2 and 8,
Sꢀ closed
SP483/SP485 RECEIVER
DC Characteristics
Differential Input Threshold
Input Hysteresis
-0.2
+0.2
Volts -7V ≤ VCM ≤ +12V
mV VCM = 0V
ꢀ0
ꢀ5
Output Voltage High
Output Voltage Low
2.4
0.0
5
Volts IO = -4mA, VID = +200mV
Volts IO = +4mA, VID = -200mV
0.4
+/-ꢀ
Three-State ( High Impedance)
Output Current
µA
0.4V ≤ VO ≤ 2.4V; RE = 5V
Input Resistance
ꢀ2
kΩ
-7V ≤ VCM ≤ +12V
Input Current (A, B); VIN = ꢀ2V
+ꢀ.0
-0.8
95
mA
DE = 0V, VCC = 0V or 5.25V,
VIN = ꢀ2V
Input Current (A, B); VIN = -7V
mA
mA
DE = 0V, VCC = 0V or 5.25V,
VIN = -7V
Short-Circuit Current
SP485 RECEIVER
0V ≤ VCM ≤ VCC
AC Characteristics
Maximum Data Rate
Receiver Input to Output
5
Mbps RE = 0V, DE = 0V
20
45
45
ꢀ3
45
45
45
45
200
200
ns
ns
ns
ns
ns
ns
ns
tPLH ; Figures 3 and 7,
RDIFF = 54Ω, CLꢀ = CL2 = ꢀ00pF
Receiver Input to Output
Differential Receiver Skew
20
tPHL ; Figures 3 and 7,
RDIFF = 54Ω, CLꢀ = CL2 = ꢀ00pF
RDIFF = 54Ω, CLꢀ = CL2 = ꢀ00pF,
Figures 3 and 7
|tPHL - tPLH
|
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from LOW
Receiver Disable from High
70
70
70
70
CRL = ꢀ5pF, Figures 2 and 8;
Sꢀ Closed
CRL = ꢀ5pF, Figures 2 and 8;
S2 Closed
CRL = ꢀ5pF, Figures 2 and 8;
Sꢀ Closed
CRL = ꢀ5pF, Figures 2 and 8;
S2 Closed
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP483_SP485_ꢀ0ꢀ_0627ꢀꢀ
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ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V +/-5% unless otherwise noted.
PARAMETERS
POWER REQUIREMENTS
Supply Voltage VCC
Supply Current
MIN.
TYP.
MAX.
UNITS CONDITIONS
+4.75
+5.25
Volts
SP485
900
900
600
600
µA
µA
µA
µA
µA
No Load; RE, DI = 0V or VCC
DE = VCC
;
No Load; RE = 0V, DI = 0V or 5V;
DE = 0V
SP483
SP483
No Load; RE, DI = 0V or VCC
DE = VCC
;
No Load; RE = 0V, DI = 0V or 5V;
DE = 0V
ꢀ0
Shutdown Mode; DE = 0V, RE = VCC
ENVIRONMENTAL AND MECHANICAL
Operating Temperature
Commercial (_C_)
Industrial (_E_)
0
70
ºC
ºC
ºC
-40
-65
+85
Storage Temperature
+ꢀ50
Package: Plastic DIP (_P), NSOIC (_N)
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP483_485_ꢀ0ꢀ_0627ꢀꢀ
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ELECTRICAL CHARACTERISTICS
TMIN to TMAX and VCC = 5V +/-5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS CONDITIONS
SP483 DRIVER
AC Characteristics
Maximum Date Rate
Driver Input to Output, tPLH
250
250
kbps
800
800
ꢀ00
2000
2000
800
ns
ns
ns
ns
tPLH; RDIFF = 54Ω, CLꢀ = CL2 = ꢀ00pF,
see figures 3 and 5
Driver Input to Output, tPHL
Driver Skew
250
tPHL; RDIFF = 54Ω, CLꢀ = CL2 = ꢀ00pF,
see figures 3 and 5
see figures 3 and 5,
tSKEW = |tDPHL - tDPLH
|
Driver Rise or Fall Time
250
2000
From ꢀ0%-90%; RDIFF = 54Ω
CLꢀ = CL2 = ꢀ00pF; see Figures 3
and 5
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from High
Driver Disable Time from Low
250
250
300
300
2000
2000
3000
3000
ns
ns
ns
ns
CL = 100pF, see figures 4 and 6,
S2 closed
CL = 100pF, see figures 4 and 6,
Sꢀ closed
CL = 15pF, see figures 4 and 6,
S2 closed
CL = 15pF, see figures 4 and 6,
Sꢀ closed
SP483 RECEIVER
AC Characteristics
Maximum Data Rate
Receiver Input to Output
250
250
kbps
ns
2000
tPLH, tPHL; Figures 3 and 7:
RDIFF = 54Ω, CLꢀ = CL2 = ꢀ00pF
Differential Receiver Skew
ꢀ00
20
20
20
20
ns
ns
ns
ns
ns
RDIFF = 54Ω, CLꢀ = CL2 = ꢀ00pF,
see Figures 3 and 7
|tPHL - tPLH
|
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from LOW
Receiver Disable from High
50
50
50
50
CRL = ꢀ5pF, Figures 2 and 8;
Sꢀ Closed
CRL = ꢀ5pF, Figures 2 and 8;
S2 Closed
CRL = ꢀ5pF, Figures 2 and 8;
Sꢀ Closed
CRL = ꢀ5pF, Figures 2 and 8;
S2 Closed
SP483
Shutdown Timing
Time to Shutdown
50
200
600
ns
ns
RE = 5V, DE = 0V
Driver Enable from Shutdown
to Output High
2000
CL = ꢀ00pF; See Figures 4 and 6;
S2 Closed
Driver Enable from Shutdown
to Output Low
2000
2500
2500
ns
ns
ns
CL = ꢀ00pF; See Figures 4 and 6;
Sꢀ Closed
Receiver Enable from
Shutdown to Output High
CL = ꢀ5pF; See Figures 4 and 6;
S2 Closed
Receiver Enable from
Shutdown to Output Low
CL = ꢀ5pF; See Figures 4 and 6;
Sꢀ Closed
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP483_SP485_ꢀ0ꢀ_0627ꢀꢀ
5
PIN FUNCTION
Pin ꢀ - 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
1kΩ
A
Test Point
1kΩ
Receiver
Output
V
CC
R
R
S
1
V
OD
C
RL
V
OC
S
2
B
Figure ꢀ. Driver DC Test Load Circuit
Figure 2. Receiver Timing Test Load Circuit
V
CC
CL1
S
1
A
A
500Ω
DI
RL
Output
Under
Test
RO
B
B
CL2
15pF
C
L
S
2
Figure 3. RS-485 Driver/Receiver Timing Test
Figure 4. Driver Timing Test Load #2 Circuit
fSP485 = 1MHz;
100kHz; t ≤10ns; t ≤10ns
=
R F
fSP483
+3V
0V
B
1.5V
1.5V
DRIVER INPUT
t
t
PHL
PLH
1/2V
1/2V
O
O
DRIVER
OUTPUT
V
O
A
t
t
DPLH
DPHL
+
V
V
DIFFERENTIAL
OUTPUT
O
0V
–
V –V
O
A
B
t
t
F
R
t
= |t
-t |
DPLH DPHL
SKEW
Figure 5. Driver Propagation Delays
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SP483_485_ꢀ0ꢀ_0627ꢀꢀ
6
FUNCTION TRUTH TABLES
INPUTS
OUTPUTS
INPUTS
OUTPUTS
LINE
RE
X
DE
ꢀ
DI
CONDITION
A
ꢀ
0
Z
Z
B
0
ꢀ
Z
Z
RE
0
DE
A - B
+0.2V
R
ꢀ
0
ꢀ
Z
ꢀ
0
No Fault
No Fault
X
0
0
0
0
X
ꢀ
0
-0.2V
X
0
X
X
0
Inputs Open
X
X
ꢀ
Fault
ꢀ
Table 2. Receive Function Truth Table
Table ꢀ. Transmit Function Truth Table
SWITCHING WAVEFORMS
100kHz; t ≤10ns; t ≤10ns
SP483 =
fSP485 = 1MHz;
f
R
F
+3V
0V
1.5V
1.5V
DE
A,B
A,B
t
t
LZ
ZL
5V
2.3V
Output normally LOW
Output normally HIGH
0.5V
0.5V
V
OL
V
OH
2.3V
0V
t
t
HZ
ZH
Figure 6. Driver Enable and Disable Times
+
–
V
OD2
0V
0V
A – B
R
INPUT
V
OD2
V
OH
1.5V
1.5V
OUTPUT
V
OL
t
|
t
PHL
PLH
f
SP485 = 1MHz;
100kHz; t ≤10ns; t ≤10ns
=
R F
f
SP483
t
= |t
- t
PLH PHL
SKEW
Figure 7. Receiver Propagation Delays
fSP485 =1MHz;
100kHz; t ≤10ns; t ≤10ns
=
R F
fSP483
+3V
0V
1.5V
1.5V
RE
R
t
t
LZ
ZL
5V
1.5V
Output normally LOW
Output normally HIGH
0.5V
0.5V
V
IL
V
IH
R
1.5V
0V
t
t
HZ
ZH
Figure 8. Receiver Enable and Disable Times
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP483_SP485_ꢀ0ꢀ_0627ꢀꢀ
7
DESCRIPTION
Receivers
SP483 and SP485
The SP483 and SP485 are half-duplex dif-
ferential transceivers that meet the require-
ments 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 SP483 and SP485 receivers have dif-
ferential inputs with an input sensitivity as
low as ±200mV. Input impedance of the
receiversistypically15kΩ(12kΩminimum).
Awide common mode range of -7V to +ꢀ2V
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 RS-485 standard is ideal for multi-drop
applicationsandforlong-distanceinterfaces.
RS-485allowsupto32driversand32receiv-
ers 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-485transceiversareequippedwith
a wide (-7V to +ꢀ2V) common mode range
to accommodate ground potential differ-
ences. Because RS-485 is a differential
interface, data is virtually immune to noise
in the transmission line.
The receiver for the SP485 will operate up
to at least ꢀ0Mbps. 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. Fail-
safe guarantees that the receiver output
will be in a HIGH state when the input is
left unconnected and floating.
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
acrossthedifferentialoutputs,thedriverscan
maintain greater than ꢀ.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
differentialdriveroutputs. AlogicLOWonthe
DE(pin 3) will tri-state the driver outputs.
Shutdown Mode
SP483
The SP483 is equipped with a Shutdown
mode. To enable the shutdown state, both
driver and receiver must be disabled simul-
taneously. Alogic 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 ꢀµA.
ThetransmittersoftheSP485willoperateup
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 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP483_485_ꢀ0ꢀ_0627ꢀꢀ
8
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP483_SP485_ꢀ0ꢀ_0627ꢀꢀ
9
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 5ꢀ0-668-70ꢀ7 • www.exar.com
SP483_485_ꢀ0ꢀ_0627ꢀꢀ
ꢀ0
ORDERING INFORMATION
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
SP483EN-L........................................................................ -40°C to +85°C...............................................................................................8-pin NSOIC
SP483EN-L/TR.................................................................. -40°C to +85°C...............................................................................................8-pin NSOIC
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 HISTORꢁ
DATE
REVISION DESCRIPTION
07/28/04
07/ꢀ4/ꢀ0
--
Legacy Sipex Datasheet
ꢀ.0.0
Convert to Exar Format. Update ordering information as a result of discontinued
Lead type package options per PDN 08ꢀꢀ26-0ꢀ. Remove all options and reference
to SP48ꢀ; Part is EOL. Remove "GND" entry from Minimum column of SP483/485
driver DC Characteristic paramter "Differential output voltage - Unloaded".
June 20ꢀꢀ
ꢀ.0.ꢀ
Remove Driver Short Circuit Current minimum. Change Vcc ABS MAX Rating from
+ꢀ2V to +7V. Add ꢀ2k ohm minimum value to receiver Input Resistance. Change
SP485 receiver propagation delay MIN and TꢁP to 20 and 45ns respectively,
receiver Enable and Disable TꢁP and MAX to 45 and 70ns respectively. Remove
SP483CS-L and SP483ES-L ordering part number per PDN ꢀꢀ05ꢀ0-0ꢀ.
Notice
EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliabil-
ity. 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 specific 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 significantly 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 20ꢀꢀ EXAR Corporation
Datasheet June 20ꢀꢀ
Send your serial transceiver technical inquiry with technical details to: serialtechsupport@exar.com
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
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SP483_SP485_ꢀ0ꢀ_0627ꢀꢀ
ꢀꢀ
The content of this document is furnished for informational use only, is subject to change without
notice, and should not be construed as a commitment by MaxLinear, Inc.. MaxLinear, Inc. assumes
no responsibility or liability for any errors or inaccuracies that may appear in the informational content
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MaxLinear, Inc.
Maxlinear, Inc. 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 significantly affect its safety or effectiveness. Products are not authorized for use in such
applications unless MaxLinear, Inc. receives, in writing, 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
MaxLinear, Inc. is adequately protected under the circumstances.
MaxLinear, Inc. may have patents, patent applications, trademarks, copyrights, or other intellectual
property rights covering subject matter in this document. Except as expressly provided in any written
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Company and product names may be registered trademarks or trademarks of the respective owners
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© 2017 MaxLinear, Inc. All rights reserved
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