2024年5月24日发(作者：厚梦凡)
元器件交易网
19-0122; Rev 8; 10/03
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
General Description__Next Generation Device Features
The MAX481, MAX483, MAX485, MAX487–MAX491, and
MAX1487 are low-power transceivers for RS-485 and RS-
♦For Fault-Tolerant Applications
422 communication. Each part contains one driver and one
MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4
receiver. The MAX483, MAX487, MAX488, and MAX489
Unit Load, +3.3V, RS-485 Transceiver
feature reduced slew-rate drivers that minimize EMI and
MAX3440E–MAX3444E: ±15kV ESD-Protected,
reduce reflections caused by improperly terminated cables,
±60V Fault-Protected, 10Mbps, Fail-Safe,
thus allowing error-free data transmission up to 250kbps.
The driver slew rates of the MAX481, MAX485, MAX490,
RS-485/J1708 Transceivers
MAX491, and MAX1487 are not limited, allowing them to
♦For Space-Constrained Applications
transmit up to 2.5Mbps.
MAX3460–MAX3464: +5V, Fail-Safe, 20Mbps,
These transceivers draw between 120µA and 500µA of
Profibus RS-485/RS-422 Transceivers
supply current when unloaded or fully loaded with disabled
MAX3362: +3.3V, High-Speed, RS-485/RS-422
drivers. Additionally, the MAX481, MAX483, and MAX487
Transceiver in a SOT23 Package
have a low-current shutdown mode in which they consume
MAX3280E–MAX3284E: ±15kV ESD-Protected,
only 0.1µA. All parts operate from a single 5V supply.
52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422,
Drivers are short-circuit current limited and are protected
True Fail-Safe Receivers
against excessive power dissipation by thermal shutdown
circuitry that places the driver outputs into a high-imped-
MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V,
ance state. The receiver input has a fail-safe feature that
SOT23, RS-855/RS-422 Transmitters
guarantees a logic-high output if the input is open circuit.
♦For Multiple Transceiver Applications
The MAX487 and MAX1487 feature quarter-unit-load
MAX3030E–MAX3033E: ±15kV ESD-Protected,
receiver input impedance, allowing up to 128 MAX487/
+3.3V, Quad RS-422 Transmitters
MAX1487 transceivers on the bus. Full-duplex communi-
♦For Fail-Safe Applications
cations are obtained using the MAX488–MAX491, while
the MAX481, MAX483, MAX485, MAX487, and MAX1487
MAX3080–MAX3089: Fail-Safe, High-Speed
are designed for half-duplex applications.
(10Mbps), Slew-Rate-Limited RS-485/RS-422
Transceivers
________________________Applications
♦For Low-Voltage Applications
Low-Power RS-485 Transceivers
MAX3483E/MAX3485E/MAX3486E/MAX3488E/
Low-Power RS-422 Transceivers
MAX3490E/MAX3491E: +3.3V Powered, ±15kV
Level Translators
ESD-Protected, 12Mbps, Slew-Rate-Limited,
True RS-485/RS-422 Transceivers
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Ordering Information appears at end of data sheet.
______________________________________________________________Selection Table
PARTHALF/FULLDATA RATESLEW-RATELOW-POWER
RECEIVER/
QUIESCENT
NUMBER OF
NUMBERDUPLEX(Mbps)LIMITEDSHUTDOWN
DRIVER
CURRENT
TRANSMITTERS
PIN
ENABLE
(µA)
ON BUS
COUNT
MAX481
Half
2.5
No
Yes
Yes
300
32
8
MAX483
Half
0.25
Yes
Yes
Yes
120
32
8
MAX485
Half
2.5
No
No
Yes
300
32
8
MAX487
Half
0.25
Yes
Yes
Yes
120
128
8
MAX488
Full
0.25
Yes
No
No
120
32
8
MAX489
Full
0.25
Yes
No
Yes
120
32
14
MAX490
Full
2.5
No
No
No
300
32
8
MAX491
Full
2.5
No
No
Yes
300
32
14
MAX1487
Half
2.5
No
No
Yes
230
128
8
________________________________________________________________Maxim Integrated Products1
For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at
1-888-629-4642, or visit Maxim’s website at .
MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487
元器件交易网
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
M
A
X
4
8
1
/
M
A
X
4
8
3
/
M
A
X
4
8
5
/
M
A
X
4
8
7
–
M
A
X
4
9
1
/
M
A
X
1
4
8
7
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
).............................................................12V
Control Input Voltage (RE, DE)...................-0.5V to (V
CC
+ 0.5V)
Driver Input Voltage (DI).............................-0.5V to (V
CC
+ 0.5V)
Driver Output Voltage (A, B)...................................-8V to +12.5V
Receiver Input Voltage (A, B).................................-8V to +12.5V
Receiver Output Voltage (RO).....................-0.5V to (V
CC
+0.5V)
Continuous Power Dissipation (T
A
= +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)....727mW
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)..800mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW
8-Pin µMAX (derate 4.1mW/°C above +70°C)..............830mW
8-Pin CERDIP (derate 8.00mW/°C above +70°C).........640mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C).......727mW
Operating Temperature Ranges
MAX4_ _C_ _/MAX1487C_ A...............................0°C to +70°C
MAX4__E_ _/MAX1487E_ A.............................-40°C to +85°C
MAX4__MJ_/-55°C to +125°C
Storage -65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
PARAMETER
Differential Driver Output (no load)
Differential Driver Output
(with load)
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
Driver Common-Mode Output
Voltage
Change in Magnitude of Driver
Common-Mode Output Voltage
for Complementary Output States
Input High Voltage
Input Low Voltage
Input Current
SYMBOL
V
OD1
V
OD2
∆V
OD
V
OC
∆V
OD
V
IH
V
IL
I
IN1
R = 50Ω(RS-422)
R = 27Ω(RS-485), Figure 4
R = 27Ωor 50Ω, Figure 4
R = 27Ωor 50Ω, Figure 4
R = 27Ωor 50Ω, Figure 4
DE, DI, RE
DE, DI, RE
DE, DI, RE
DE = 0V;
V
CC
= 0V or 5.25V,
all devices except
MAX487/MAX1487
MAX487/MAX1487,
DE = 0V, V
CC
= 0V or 5.25V
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
Three-State (high impedance)
Output Current at Receiver
V
TH
∆V
TH
V
OH
V
OL
I
OZR
-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
-7V ≤V
CM
≤12V, all devices except
MAX487/MAX1487
-7V ≤V
CM
≤12V, MAX487/MAX1487
12
48
3.5
0.4
±1
V
IN
= 12V
V
IN
= -7V
V
IN
= 12V
V
IN
= -7V
-0.2
70
2.0
0.8
±2
1.0
mA
-0.8
0.25
-0.2
0.2
mA
V
mV
V
V
µA
kΩ
kΩ
2
1.55
0.2
3
0.2
CONDITIONSMINTYPMAX
5
UNITS
V
V
V
V
V
V
V
µA
Input Current
(A, B)
I
IN2
Receiver Input ResistanceR
IN
2_______________________________________________________________________________________
2024年5月24日发(作者：厚梦凡)
元器件交易网
19-0122; Rev 8; 10/03
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
General Description__Next Generation Device Features
The MAX481, MAX483, MAX485, MAX487–MAX491, and
MAX1487 are low-power transceivers for RS-485 and RS-
♦For Fault-Tolerant Applications
422 communication. Each part contains one driver and one
MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4
receiver. The MAX483, MAX487, MAX488, and MAX489
Unit Load, +3.3V, RS-485 Transceiver
feature reduced slew-rate drivers that minimize EMI and
MAX3440E–MAX3444E: ±15kV ESD-Protected,
reduce reflections caused by improperly terminated cables,
±60V Fault-Protected, 10Mbps, Fail-Safe,
thus allowing error-free data transmission up to 250kbps.
The driver slew rates of the MAX481, MAX485, MAX490,
RS-485/J1708 Transceivers
MAX491, and MAX1487 are not limited, allowing them to
♦For Space-Constrained Applications
transmit up to 2.5Mbps.
MAX3460–MAX3464: +5V, Fail-Safe, 20Mbps,
These transceivers draw between 120µA and 500µA of
Profibus RS-485/RS-422 Transceivers
supply current when unloaded or fully loaded with disabled
MAX3362: +3.3V, High-Speed, RS-485/RS-422
drivers. Additionally, the MAX481, MAX483, and MAX487
Transceiver in a SOT23 Package
have a low-current shutdown mode in which they consume
MAX3280E–MAX3284E: ±15kV ESD-Protected,
only 0.1µA. All parts operate from a single 5V supply.
52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422,
Drivers are short-circuit current limited and are protected
True Fail-Safe Receivers
against excessive power dissipation by thermal shutdown
circuitry that places the driver outputs into a high-imped-
MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V,
ance state. The receiver input has a fail-safe feature that
SOT23, RS-855/RS-422 Transmitters
guarantees a logic-high output if the input is open circuit.
♦For Multiple Transceiver Applications
The MAX487 and MAX1487 feature quarter-unit-load
MAX3030E–MAX3033E: ±15kV ESD-Protected,
receiver input impedance, allowing up to 128 MAX487/
+3.3V, Quad RS-422 Transmitters
MAX1487 transceivers on the bus. Full-duplex communi-
♦For Fail-Safe Applications
cations are obtained using the MAX488–MAX491, while
the MAX481, MAX483, MAX485, MAX487, and MAX1487
MAX3080–MAX3089: Fail-Safe, High-Speed
are designed for half-duplex applications.
(10Mbps), Slew-Rate-Limited RS-485/RS-422
Transceivers
________________________Applications
♦For Low-Voltage Applications
Low-Power RS-485 Transceivers
MAX3483E/MAX3485E/MAX3486E/MAX3488E/
Low-Power RS-422 Transceivers
MAX3490E/MAX3491E: +3.3V Powered, ±15kV
Level Translators
ESD-Protected, 12Mbps, Slew-Rate-Limited,
True RS-485/RS-422 Transceivers
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Ordering Information appears at end of data sheet.
______________________________________________________________Selection Table
PARTHALF/FULLDATA RATESLEW-RATELOW-POWER
RECEIVER/
QUIESCENT
NUMBER OF
NUMBERDUPLEX(Mbps)LIMITEDSHUTDOWN
DRIVER
CURRENT
TRANSMITTERS
PIN
ENABLE
(µA)
ON BUS
COUNT
MAX481
Half
2.5
No
Yes
Yes
300
32
8
MAX483
Half
0.25
Yes
Yes
Yes
120
32
8
MAX485
Half
2.5
No
No
Yes
300
32
8
MAX487
Half
0.25
Yes
Yes
Yes
120
128
8
MAX488
Full
0.25
Yes
No
No
120
32
8
MAX489
Full
0.25
Yes
No
Yes
120
32
14
MAX490
Full
2.5
No
No
No
300
32
8
MAX491
Full
2.5
No
No
Yes
300
32
14
MAX1487
Half
2.5
No
No
Yes
230
128
8
________________________________________________________________Maxim Integrated Products1
For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at
1-888-629-4642, or visit Maxim’s website at .
MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487
元器件交易网
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
M
A
X
4
8
1
/
M
A
X
4
8
3
/
M
A
X
4
8
5
/
M
A
X
4
8
7
–
M
A
X
4
9
1
/
M
A
X
1
4
8
7
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
).............................................................12V
Control Input Voltage (RE, DE)...................-0.5V to (V
CC
+ 0.5V)
Driver Input Voltage (DI).............................-0.5V to (V
CC
+ 0.5V)
Driver Output Voltage (A, B)...................................-8V to +12.5V
Receiver Input Voltage (A, B).................................-8V to +12.5V
Receiver Output Voltage (RO).....................-0.5V to (V
CC
+0.5V)
Continuous Power Dissipation (T
A
= +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)....727mW
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)..800mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW
8-Pin µMAX (derate 4.1mW/°C above +70°C)..............830mW
8-Pin CERDIP (derate 8.00mW/°C above +70°C).........640mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C).......727mW
Operating Temperature Ranges
MAX4_ _C_ _/MAX1487C_ A...............................0°C to +70°C
MAX4__E_ _/MAX1487E_ A.............................-40°C to +85°C
MAX4__MJ_/-55°C to +125°C
Storage -65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 5V ±5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
PARAMETER
Differential Driver Output (no load)
Differential Driver Output
(with load)
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
Driver Common-Mode Output
Voltage
Change in Magnitude of Driver
Common-Mode Output Voltage
for Complementary Output States
Input High Voltage
Input Low Voltage
Input Current
SYMBOL
V
OD1
V
OD2
∆V
OD
V
OC
∆V
OD
V
IH
V
IL
I
IN1
R = 50Ω(RS-422)
R = 27Ω(RS-485), Figure 4
R = 27Ωor 50Ω, Figure 4
R = 27Ωor 50Ω, Figure 4
R = 27Ωor 50Ω, Figure 4
DE, DI, RE
DE, DI, RE
DE, DI, RE
DE = 0V;
V
CC
= 0V or 5.25V,
all devices except
MAX487/MAX1487
MAX487/MAX1487,
DE = 0V, V
CC
= 0V or 5.25V
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
Three-State (high impedance)
Output Current at Receiver
V
TH
∆V
TH
V
OH
V
OL
I
OZR
-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
-7V ≤V
CM
≤12V, all devices except
MAX487/MAX1487
-7V ≤V
CM
≤12V, MAX487/MAX1487
12
48
3.5
0.4
±1
V
IN
= 12V
V
IN
= -7V
V
IN
= 12V
V
IN
= -7V
-0.2
70
2.0
0.8
±2
1.0
mA
-0.8
0.25
-0.2
0.2
mA
V
mV
V
V
µA
kΩ
kΩ
2
1.55
0.2
3
0.2
CONDITIONSMINTYPMAX
5
UNITS
V
V
V
V
V
V
V
µA
Input Current
(A, B)
I
IN2
Receiver Input ResistanceR
IN
2_______________________________________________________________________________________