Maxim MAX3081 Fail-safe, high-speed 10mbps, slew-rate-limited rs-485/rs-422 transceiver Datasheet

19-1138; Rev 1; 12/97
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
These transceivers typically draw 375µA of supply
current when unloaded, or when fully loaded with the
drivers disabled.
All devices have a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus. The
MAX3082/MAX3085/MAX3088 are intended for halfduplex communications, while the MAX3080/MAX3081/
MAX3083/MAX3084/MAX3086/MAX3087 are intended
for full-duplex communications. The MAX3089 is selectable between half-duplex and full-duplex operation. It
also features independently programmable receiver
and transmitter output phase via separate pins.
Features
♦ True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
♦ Enhanced Slew-Rate Limiting Facilitates
Error-Free Data Transmission
(MAX3080–MAX3085/MAX3089)
♦ 1nA Low-Current Shutdown Mode (except
MAX3081/MAX3084/MAX3087)
♦ Pin-Selectable Full/Half-Duplex Operation
(MAX3089)
♦ Phase Controls to Correct for Twisted-Pair
Reversal (MAX3089)
♦ Allow Up to 256 Transceivers on the Bus
Applications
RS-422/RS-485 Communications
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX3080CPD
0°C to +70°C
14 Plastic DIP
MAX3080CSD
MAX3080EPD
MAX3080ESD
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
14 SO
14 Plastic DIP
14 SO
Ordering Information continued on last page.
Selection Table
Part
Half/Full
Duplex
Data
Rate
(Mbps)
Slew
Rate
Limited
LowPower
Shutdown
Receiver/
Driver
Enable
Quiescent Transceivers
Current
On
(µA)
Bus
Pin
Count
IndustryStandard
Pinout
MAX3080
Full
0.115
Yes
Yes
Yes
375
MAX3081
Full
0.115
Yes
No
No
375
256
14
75180
256
8
75179
MAX3082
Half
0.115
Yes
Yes
Yes
375
MAX3083
Full
0.5
Yes
Yes
Yes
375
256
8
75176
256
14
MAX3084
Full
0.5
Yes
No
No
75180
375
256
8
75179
MAX3085
Half
0.5
Yes
Yes
MAX3086
Full
10
No
Yes
Yes
375
256
8
75176
Yes
375
256
14
MAX3087
Full
10
No
75180
No
No
375
256
8
75179
MAX3088
Half
10
No
Yes
Yes
375
256
8
75176
MAX3089
Selectable
Selectable
Selectable
Yes
Yes
375
256
14
75180*
*Pin-compatible with 75180, with additional features implemented using pins 1, 6, 8, and 13.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX3080–MAX3089
General Description
The MAX3080–MAX3089 high-speed transceivers for
RS-485/RS-422 communication contain one driver and
one receiver. These devices feature fail-safe circuitry,
which guarantees a logic-high receiver output when the
receiver inputs are open or shorted. This means that
the receiver output will be a logic high if all transmitters
on a terminated bus are disabled (high impedance).
The MAX3080/MAX3081/MAX3082 feature reduced
slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing
error-free data transmission up to 115kbps. The
MAX3083/MAX3084/MAX3085 offer higher driver output slew-rate limits, allowing transmit speeds up to
500kbps. The MAX3086/MAX3087/MAX3088’s driver
slew rates are not limited, making transmit speeds up
to 10Mbps possible. The MAX3089’s slew rate is
selectable between 115kbps, 500kbps, and 10Mbps
by driving a selector pin with a single three-state
driver.
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) ............................................................+7V
Control Input Voltage (RE, DE)...................-0.3V to (VCC + 0.3V)
Special Input Voltage
(H/F, SRL, TXP, RXP)..................................-0.3V to (VCC + 0.3V)
Driver Input Voltage (DI).............................-0.3V to (VCC + 0.3V)
Driver Output Voltage (A, B, Y, Z)........................................±13V
Receiver Input Voltage (A, B) ..............................................±13V
Receiver Input Voltage, Full Duplex (A, B) ..........................±25V
Receiver Output Voltage (RO)....................-0.3V to (VCC + 0.3V)
Continuous Power Dissipation
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ...727mW
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
14-Pin Plastic DIP (derate 10.0mW/°C above +70°C) ....800mW
14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW
Operating Temperature Ranges
MAX308_C_ _ .....................................................0°C to +70°C
MAX308_E_ _...................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°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
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
5
V
DRIVER
Differential Driver Output
(no load)
VOD1
Differential Driver Output
VOD2
Change in Magnitude of
Differential Output Voltage
(Note 2)
∆VOD
Figure 5, R = 50Ω or R = 27Ω
0.2
V
VOC
Figure 5, R = 50Ω or R = 27Ω
3
V
Change In Magnitude of
Common-Mode Voltage (Note 2)
∆VOC
Figure 5, R = 50Ω or R = 27Ω
0.2
V
Input High Voltage
VIH1
DE, DI, RE, H/F, TXP, RXP
Input Low Voltage
VIL1
DI Input Hysteresis
VHYS
DE, DI, RE, H/F, TXP, RXP
MAX3080–MAX3085, and MAX3089 with
SRL = VCC or unconnected
Driver Common-Mode Output
Voltage
Figure 5
Figure 5, R = 50Ω (RS-422)
2.0
Figure 5, R = 27Ω (RS-485)
1.5
IIN1
DE, DI, RE
Input High Voltage
Input Middle Voltage
IIN2
VIH2
VIM2
H/F, TXP, RXP, internal pull-down
SRL
SRL (Note 3)
Input Low Voltage
VIL2
SRL Input Current
V
2.0
V
0.8
100
mV
±2
10
VCC - 0.8
0.4VCC
40
µA
0.6VCC
V
V
SRL
0.8
V
SRL = VCC
75
SRL Input Current
IIN3
Input Current (A and B)
Full Duplex
IIN4
DE = GND,
VCC = GND or 5.25V
VIN = 12V
125
VIN = -7V
-75
Output Leakage (Y and Z)
Full Duplex
IO
DE = GND,
VCC = GND or 5.25V
VIN = 12V
125
Driver Short-Circuit Output
Current (Note 4)
VOD1
2
V
SRL = GND (Note 3)
-7V ≤ VOUT ≤ VCC
0V ≤ VOUT ≤ 12V
0V ≤ VOUT ≤ VCC
-75
VIN = -7V
-100
µA
µA
µA
-250
250
±25
_______________________________________________________________________________________
mA
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
-200
-125
-50
mV
0.4
mV
V
V
±1
µA
RECEIVER
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
∆VTH
VOH
VOL
IO = -4mA, VID = -50mV
IO = 4mA, VID = -200mV
Three-State Output Current at
Receiver
IOZR
0.4V ≤ VO ≤ 2.4V
Receiver Input Resistance
RIN
-7V ≤ VCM ≤ 12V
96
Receiver Output Short-Circuit
Current
IOSR
0V ≤ VRO ≤ VCC
±7
VTH
-7V ≤ VCM ≤ 12V
25
VCC -1.5
kΩ
±95
mA
SUPPLY CURRENT
Supply Current
ICC
Supply Current in Shutdown
Mode
ISHDN
No load,
RE = DI = GND
or VCC, SRL = VCC
DE = VCC
430
900
DE = GND
375
600
No load,
RE = DI = GND
or VCC, SRL = GND
DE = VCC
475
1000
DE = GND
420
800
0.001
10
DE = GND, VRE = VCC
µA
µA
µA
Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referred to device
ground unless otherwise noted.
Note 2: ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state.
Note 3: The SRL pin is internally biased to VCC / 2 by a 100kΩ/100kΩ resistor divider. It is guaranteed to be VCC / 2 if left
unconnected.
Note 4: Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during
current limiting.
_______________________________________________________________________________________
3
MAX3080–MAX3089
DC ELECTRICAL CHARACTERISTICS (continued)
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
SWITCHING CHARACTERISTICS—MAX3080–MAX3082, and MAX3089 with
SRL = Unconnected
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER
Driver Input to Output
SYMBOL
tDPLH
tDPHL
CONDITIONS
Figures 7 and 9, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Driver Output Skew
| tDPLH - tDPHL |
tDSKEW
Figures 7 and 9, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Driver Rise or Fall Time
tDR, tDF
Figures 7 and 9, RDIFF = 54Ω,
CL1 = CL2 = 100pF
MIN
TYP
MAX
500
2030
2600
500
2030
2600
-3
±200
ns
1320
2500
ns
667
115
UNITS
ns
Maximum Data Rate
fMAX
kbps
Driver Enable to Output High
tDZH
Figures 8 and 10, CL = 100pF, S2 closed
3500
ns
Driver Enable to Output Low
tDZL
Figures 8 and 10, CL = 100pF, S1 closed
3500
ns
Driver Disable Time from Low
tDLZ
Figures 8 and 10, CL = 15pF, S1 closed
100
ns
Driver Disable Time from High
tDHZ
Figures 8 and 10, CL = 15pF, S2 closed
100
ns
Receiver Input to Output
tRPLH,
tRPHL
Figures 11 and 13; | VID | ≥ 2.0V;
rise and fall time of VID ≤ 15ns
127
200
ns
| tRPLH - tRPHL | Differential
Receiver Skew
tRSKD
Figures 11 and 13; | VID | ≥ 2.0V;
rise and fall time of VID ≤ 15ns
3
±30
ns
Receiver Enable to Output Low
tRZL
Figures 6 and 12, CL = 100pF, S1 closed
20
50
ns
Receiver Enable to Output High
tRZH
Figures 6 and 12, CL = 100pF, S2 closed
20
50
ns
Receiver Disable Time from Low
tRLZ
Figures 6 and 12, CL = 100pF, S1 closed
20
50
ns
Receiver Disable Time from
High
tRHZ
Figures 6 and 12, CL = 100pF, S2 closed
20
50
ns
200
600
ns
Time to Shutdown
tSHDN
(Note 5)
50
Driver Enable from Shutdown to
Output High
tDZH(SHDN)
Figures 8 and 10, CL = 15pF, S2 closed
6000
ns
Driver Enable from Shutdown to
Output Low
tDZL(SHDN)
Figures 8 and 10, CL = 15pF, S1 closed
6000
ns
Receiver Enable from Shutdown
to Output High
tRZH(SHDN)
Figures 6 and 12, CL = 100pF, S2 closed
3500
ns
Receiver Enable from Shutdown
to Output Low
tRZL(SHDN)
Figures 6 and 12, CL = 100pF, S1 closed
3500
ns
4
_______________________________________________________________________________________
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
MAX3080–MAX3089
SWITCHING CHARACTERISTICS—MAX3083–MAX3085, and MAX3089 with SRL = VCC
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER
Driver Input to Output
SYMBOL
tDPLH
tDPHL
CONDITIONS
Figures 7 and 9, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Driver Output Skew
| tDPLH - tDPHL |
tDSKEW
Figures 7 and 9, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Driver Rise or Fall Time
tDR, tDF
Figures 7 and 9, RDIFF = 54Ω,
CL1 = CL2 = 100pF
MIN
TYP
MAX
250
720
1000
250
720
1000
-3
±100
ns
530
750
ns
200
500
UNITS
ns
Maximum Data Rate
fMAX
Driver Enable to Output High
tDZH
Figures 8 and 10, CL = 100pF, S2 closed
2500
kbps
ns
Driver Enable to Output Low
tDZL
Figures 8 and 10, CL = 100pF, S1 closed
2500
ns
Driver Disable Time from Low
tDLZ
Figures 8 and 10, CL = 15pF, S1 closed
100
ns
Driver Disable Time from High
tDHZ
Figures 8 and 10, CL = 15pF, S2 closed
100
ns
Receiver Input to Output
tRPLH,
tRPHL
Figures 11 and 13; | VID | ≥ 2.0V;
rise and fall time of VID ≤ 15ns
127
200
ns
| tRPLH - tRPHL | Differential
Receiver Skew
tRSKD
Figures 11 and 13; | VID | ≥ 2.0V;
rise and fall time of VID ≤ 15ns
3
±30
ns
Receiver Enable to Output Low
tRZL
Figures 6 and 12, CL = 100pF, S1 closed
20
50
ns
Receiver Enable to Output High
tRZH
Figures 6 and 12, CL = 100pF, S2 closed
20
50
ns
Receiver Disable Time from Low
tRLZ
Figures 6 and 12, CL = 100pF, S1 closed
20
50
ns
Receiver Disable Time from
High
tRHZ
Figures 6 and 12, CL = 100pF, S2 closed
20
50
ns
200
600
ns
Time to Shutdown
tSHDN
(Note 5)
50
Driver Enable from Shutdown to
Output High
tDZH(SHDN)
Figures 8 and 10, CL = 15pF, S2 closed
4500
ns
Driver Enable from Shutdown to
Output Low
tDZL(SHDN)
Figures 8 and 10, CL = 15pF, S1 closed
4500
ns
Receiver Enable from Shutdown
to Output High
tRZH(SHDN)
Figures 6 and 12, CL = 100pF, S2 closed
3500
ns
Receiver Enable from Shutdown
to Output Low
tRZL(SHDN)
Figures 6 and 12, CL = 100pF, S1 closed
3500
ns
_______________________________________________________________________________________
5
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
SWITCHING CHARACTERISTICS—MAX3086–MAX3088, and MAX3089 with SRL = GND
(VCC = +5V ±5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETER
Driver Input to Output
SYMBOL
tDPLH
tDPHL
CONDITIONS
MIN
Figures 7 and 9, RDIFF = 54Ω,
CL1 = CL2 = 100pF
TYP
MAX
34
60
34
60
UNITS
ns
Driver Output Skew
| tDPLH - tDPHL |
tDSKEW
Figures 7 and 9, RDIFF = 54Ω,
CL1 = CL2 = 100pF
-2.5
±10
ns
Driver Rise or Fall Time
tDR, tDF
Figures 7 and 9, RDIFF = 54Ω,
CL1 = CL2 = 100pF
14
25
ns
Maximum Data Rate
fMAX
Driver Enable to Output High
tDZH
Figures 8 and 10, CL = 100pF, S2 closed
150
ns
Driver Enable to Output Low
tDZL
Figures 8 and 10, CL = 100pF, S1 closed
150
ns
Driver Disable Time from Low
tDLZ
Figures 8 and 10, CL = 15pF, S1 closed
100
ns
Driver Disable Time from High
tDHZ
Figures 8 and 10, CL = 15pF, S2 closed
100
ns
Receiver Input to Output
| tRPLH - tRPHL | Differential
Receiver Skew
10
Mbps
tRPLH,
tRPHL
Figures 11 and 13; | VID | ≥ 2.0V;
rise and fall time of VID ≤ 15ns
106
150
ns
tRSKD
Figures 11 and 13; | VID | ≥ 2.0V;
rise and fall time of VID ≤ 15ns
0
±10
ns
Receiver Enable to Output Low
tRZL
Figures 6 and 12, CL = 100pF, S1 closed
20
50
ns
Receiver Enable to Output High
tRZH
Figures 6 and 12, CL = 100pF, S2 closed
20
50
ns
Receiver Disable Time from Low
tRLZ
Figures 6 and 12, CL = 100pF, S1 closed
20
50
ns
Receiver Disable Time from
High
tRHZ
Figures 6 and 12, CL = 100pF, S2 closed
20
50
ns
200
600
ns
Time to Shutdown
tSHDN
(Note 5)
50
Driver Enable from Shutdown to
Output High
tDZH(SHDN)
Figures 8 and 10, CL = 15pF, S2 closed
250
ns
Driver Enable from Shutdown to
Output Low
tDZL(SHDN)
Figures 8 and 10, CL = 15pF, S1 closed
250
ns
Receiver Enable from Shutdown
to Output High
tRZH(SHDN)
Figures 6 and 12, CL = 100pF, S2 closed
3500
ns
Receiver Enable from Shutdown
to Output Low
tRZL(SHDN)
Figures 6 and 12, CL = 100pF, S1 closed
3500
ns
Note 5: The device is put into shutdown by bringing RE high and DE low. If the enable inputs are in this state for less than 50ns, the
device is guaranteed not to enter shutdown. If the enable inputs are in this state for at least 600ns, the device is guaranteed
to have entered shutdown.
6
_______________________________________________________________________________________
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
A
DE = GND
B
375
A
B: MAX3080–MAX3085,
MAX3089 WITH
SRL = OPEN OR VCC
B
325
10
300
20
40
60
80
100
MAX3080/3089 TOC-3
15
10
0
0
2
1
3
5
4
0
2
1
3
5
4
TEMPERATURE (°C)
OUTPUT LOW VOLTAGE (V)
OUTPUT HIGH VOLTAGE (V)
SHUTDOWN CURRENT
vs. TEMPERATURE
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
14
12
10
8
6
4
IRO = 8mA
0.45
0.40
0.35
0.30
0.25
0.20
4.5
IRO = 8mA
4.4
OUTPUT VOLTAGE (V)
16
0.50
OUTPUT LOW VOLTAGE (V)
MAX3080/3089 TOC-1
20
18
0
0.10
-60 -40 -20
0
20
40
60
80
100
4.2
4.1
4.0
3.9
0.15
2
4.3
3.8
-60 -40
-20
0
20
40
60
80
100
-60 -40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY
(500kbps MODE) vs. TEMPERATURE
RECEIVER PROPAGATION DELAY
(10Mbps MODE) vs. TEMPERATURE
DRIVER PROPAGATION DELAY
(115kbps MODE) vs. TEMPERATURE
CLOAD = 100pF
135
130
125
120
112
110
PROPAGATION DELAY (ns)
MAX3080/3089 TOC-7
140
CLOAD = 100pF
108
106
104
102
100
98
2.20
MAX3080/3089 TOC-9
SHUTDOWN CURRENT (nA)
20
5
0
0
-60 -40 -20
PROPAGATION DELAY (ns)
20
Rt = 54Ω
PROPAGATION DELAY (µs)
350
30
25
MAX3080/3089 TOC-4
400
40
MAX3080/3089 TOC-5
425
50
30
OUTPUT CURRENT (mA)
450
60
MAX3080/3089 TOC-2
DE = VCC
OUTPUT CURRENT
vs. RECEIVER OUTPUT HIGH VOLTAGE
MAX3080/3089 TOC-8
475
A: MAX3086–MAX3088,
MAX3089 WITH
SRL = GND
OUTPUT CURRENT (mA)
NO-LOAD SUPPLY CURRENT (µA)
525
500
OUTPUT CURRENT
vs. RECEIVER OUTPUT LOW VOLTAGE
MAX3080/3089 TOC-16
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
2.15
2.10
2.05
2.00
1.95
96
115
94
-60 -40 -20
0
20
40
60
TEMPERATURE (°C)
80
100
1.90
-60 -40 -20
0
20
40
60
TEMPERATURE (°C)
80
100
-60 -40 -20
0
20
40
60
80
100
TEMPERATURE (°C)
_______________________________________________________________________________________
7
MAX3080–MAX3089
Typical Operating Characteristics
(VCC = +5V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VCC = +5V, TA = +25°C, unless otherwise noted.)
800
760
720
680
640
600
55
50
45
40
35
30
-60 -40 -20
0
20
40
60
80
-60 -40 -20
100
DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
1.86
1.85
40
60
80
-60 -40 -20
100
0
40
20
60
80
TEMPERATURE (°C)
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
MAX3080-25
100
80
60
40
100
-100
-90
OUTPUT CURRENT (mA)
0.1
20
120
OUTPUT CURRENT (mA)
1
0
140
MAX3080 TOC-12
10
1.87
TEMPERATURE (°C)
TEMPERATURE (°C)
100
1.88
1.83
20
520
Rt = 54Ω
1.89
1.84
25
560
1.90
MAX3080/3089 TOC-13
Rt = 54Ω
MAX3080/3089 TOC-27
840
60
MAX3080/3089 TOC-11
Rt = 54Ω
PROPAGATION DELAY (ns)
PROPAGATION DELAY (ns)
MAX3080/3089 TOC-10
920
880
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
DRIVER PROPAGATION DELAY
(10Mbps MODE) vs. TEMPERATURE
OUTPUT VOLTAGE (V)
DRIVER PROPAGATION DELAY
(500kbps MODE) vs. TEMPERATURE
OUTPUT CURRENT (mA)
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
-80
-70
-60
-50
-40
-30
-20
20
0
1
2
3
4
DIFFERENTIAL OUTPUT VOLTAGE (V)
8
-10
0
0
0.01
5
0
2
4
6
8
10
OUTPUT LOW VOLTAGE (V)
12
-8
-6
-4
-2
0
2
OUTPUT HIGH VOLTAGE (V)
_______________________________________________________________________________________
4
6
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
RECEIVER PROPAGATION DELAY
MAX3080–MAX3085, AND MAX3089
WITH SRL = OPEN OR VCC
RECEIVER PROPAGATION DELAY
MAX3086–MAX3088, AND MAX3089
WITH SRL = GND
MAX3080/3089 TYP-17
MAX3080/3089 TYP-18
VA - VB
2V/div
VA - VB
2V/div
RO
5V/div
RO
5V/div
50ns/div
50ns/div
DRIVER PROPAGATION DELAY
MAX3080/MAX3081/MAX3082, AND MAX3089
WITH SRL = OPEN
MAX3080/3089 TYP-20
DI
5V/div
VY - VZ
2.5V/div
2µs/div
DRIVER PROPAGATION DELAY
MAX3083/MAX3084/MAX3085, AND MAX3089
WITH SRL = VCC
DRIVER PROPAGATION DELAY
MAX3086/MAX3087/MAX3088, AND MAX3089
WITH SRL = GND
MAX3080/3089 TYP-21
DI
MAX3080/3089 TYP-22
5V/div
VY - VZ
2.5V/div
500ns/div
DI
5V/div
VY - VZ
2.5V/div
50ns/div
_______________________________________________________________________________________
9
MAX3080–MAX3089
Typical Operating Characteristics (continued)
(VCC = +5V, TA = +25°C, unless otherwise noted.)
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
Pin Description
PIN
PIN
MAX3080 MAX3081 MAX3082
MAX3083 MAX3084 MAX3085
MAX3086 MAX3087 MAX3088
FULL-DUPLEX
DEVICES
10
MAX3089
HALFFULLDUPLEX DUPLEX
DEVICES MODE
NAME
FUNCTION
HALFDUPLEX
MODE
—
—
—
1
1
H/F
Half/Full-Duplex Selector Pin. Connect H/F to VCC for half-duplex
mode; connect to GND or leave unconnected for full-duplex mode.
2
2
1
2
2
RO
Receiver Output. When RE is low and if A - B ≥ -50mV, RO will be
high; if A - B ≤ -200mV, RO will be low.
3
—
2
3
3
RE
Receiver Output Enable. Drive RE low to enable RO; RO is high
impedance when RE is high. Drive RE high and DE low to enter
low-power shutdown mode.
4
—
3
4
4
DE
Driver Output Enable. Drive DE high to enable driver outputs. These
outputs are high impedance when DE is low. Drive RE high and DE
low to enter low-power shutdown mode.
5
3
4
5
5
DI
Driver Input. With DE high, a low on DI forces noninverting output
low and inverting output high. Similarly, a high on DI forces noninverting output high and inverting output low.
—
—
—
6
6
SRL
Slew-Rate-Limit Selector Pin. Connect SRL to GND for 10Mbps
communication rate; connect to VCC for 500kbps communication
rate. Leave unconnected for 115kbps communication rate.
6, 7
4
5
7
7
GND
Ground
—
—
—
8
8
TXP
Transmitter Phase. Connect TXP to GND, or leave floating for normal
transmitter phase/polarity. Connect to VCC to invert the transmitter
phase/polarity.
9
5
—
9
—
Y
Noninverting Driver Output
—
—
—
—
9
Y
Noninverting Receiver Input and Noninverting Driver Output*
10
6
—
10
—
Z
Inverting Driver Output
—
—
—
—
10
Z
Inverting Receiver Input and Inverting Driver Output*
11
7
—
11
—
B
Inverting Receiver Input
—
—
—
—
11
B
Receiver Input Resistors*
—
—
7
—
—
B
Inverting Receiver Input and Inverting Driver Output
______________________________________________________________________________________
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
PIN
MAX3080 MAX3081 MAX3082
MAX3083 MAX3084 MAX3085
MAX3086 MAX3087 MAX3088
MAX3089
NAME
HALFFULLDUPLEX DUPLEX
DEVICES MODE
FULL-DUPLEX
DEVICES
FUNCTION
HALFDUPLEX
MODE
12
8
—
12
—
A
Noninverting Receiver Input
—
—
—
—
12
A
Receiver Input Resistors*
—
—
6
—
—
A
Noninverting Receiver Input and Noninverting Driver Output
—
—
—
13
13
RXP
Receiver Phase. Connect RXP to GND, or leave unconnected for
normal transmitter phase/polarity. Connect to VCC to invert the
receiver phase/polarity.
14
1
8
14
14
VCC
Positive Supply; 4.75V ≤ VCC ≤ 5.25V
1, 8, 13
—
—
—
—
N.C.
Not Connected. Not internally connected.
*(MAX3089 only.) In half-duplex mode, the driver outputs serve as receiver inputs. The full-duplex receiver inputs (A and B) will still
have a 1/8-unit load, but are not connected to the receiver.
Function Tables
MAX3080/MAX3083/MAX3086
MAX3081/MAX3084/MAX3087
TRANSMITTING
TRANSMITTING
INPUTS
RE
INPUT
OUTPUTS
DE
DI
Z
1
0
OUTPUTS
Y
DI
Z
Y
1
1
0
1
0
1
0
X
1
X
1
0
1
0
0
0
X
High-Z
High-Z
1
0
X
Shutdown
RECEIVING
RE
OUTPUT
A-B
RO
OUTPUT
≥ -0.05V
1
RO
≤ -0.2V
0
Open/shorted
1
RECEIVING
INPUTS
INPUTS
DE
A-B
0
X
≥ -0.05V
1
0
X
≤ -0.2V
0
0
X
Open/shorted
1
1
1
X
High-Z
1
0
X
Shutdown
X = Don’t care
Shutdown mode, driver and receiver outputs high impedance
______________________________________________________________________________________
11
MAX3080–MAX3089
Pin Description (continued)
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
Function Tables (continued)
MAX3082/MAX3085/MAX3088
MAX3089
TRANSMITTING
TRANSMITTING
INPUTS
RE
INPUTS
OUTPUTS
DE
DI
B/Z
1
OUTPUTS
A/Y
TXP
RE
DE
DI
Z
Y
1
0
X
1
1
0
1
X
1
0
X
1
0
1
0
0
X
1
0
1
0
0
0
X
High-Z
High-Z
1
X
1
1
1
0
1
0
X
1
X
1
0
0
1
X
0
0
X
High-Z
High-Z
X
1
0
X
Shutdown
Shutdown
RECEIVING
INPUTS
OUTPUT
RE
DE
A-B
RO
0
X
≥ -0.05V
1
0
X
≤ -0.2V
0
H/F
RXP
RE
DE
A-B
Y-Z
RO
0
X
Open/shorted
1
0
0
0
X
≥ -0.05V
X
1
1
1
X
High-Z
0
0
0
X
≤ -0.2V
X
0
1
0
X
Shutdown
0
1
0
X
≥ -0.05V
X
0
0
1
0
X
≤ -0.2V
X
1
1
0
0
0
X
≥ -0.05V
1
1
0
0
0
X
≤ -0.2V
0
1
1
0
0
X
≥ -0.05V
0
1
1
0
0
X
≤ -0.2V
1
0
0
0
X
Open/
shorted
X
1
1
0
0
0
X
Open/
shorted
1
0
1
0
X
Open/
shorted
X
0
1
1
0
0
X
Open/
shorted
0
X
X
1
1
X
X
High-Z
X
X
1
0
X
X
Shutdown
RECEIVING
INPUTS
OUTPUT
X = Don’t care
Shutdown mode, driver and receiver outputs high impedance
12
______________________________________________________________________________________
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
4
R
RO 2
13 N.C.
RE 3
12 A
DE 4
11 B
DI 5
10 Z
D
GND 6
GND 7
9
Y
8
N.C.
VCC RE
0.1µF
14
14 VCC
N.C. 1
9
5
DI
Y
MAX3080
MAX3083
MAX3086
Rt
D
MAX3080–MAX3089
VCC
DE
TOP VIEW
TOP VIEW
RO
R
10
Z
12
2
RO
R
A
Rt
D
11
DI
B
NC
1, 8, 13
3
DIP/SO
6, 7 GND
RE
GND
DE
Figure 1. MAX3080/MAX3083/MAX3086 Pin Configuration and Typical Full-Duplex Operating Circuit
TOP VIEW
0.1µF
TOP VIEW
VCC
MAX3081
MAX3084
MAX3087
VCC 1
5 Y
8
A
RO 2
7
B
DI 3
6
Z
VCC 1
GND 4
R
D
5
Y
DI
3
Rt
D
R
6 Z
RO
8 A
RO
2
R
Rt
D
7
DI
B
DIP/SO
4 GND
GND
Figure 2. MAX3081/MAX3084/MAX3087 Pin Configuration and Typical Full-Duplex Operating Circuit
TOPVIEW
VIEW
TOP
0.1µF
RO
1
R
8
VCC
RO
1
RE 2
7
B
RE 2
DE 3
6
A
DE 3
5
GND
DI 4
DI 4
D
R
D
MAX3082
MAX3085
MAX3088
8 VCC
7 B
Rt
6
A
5 GND
DE
D
DI
B
Rt
A
RO
R
RE
DIP/SO
NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH.
Figure 3. MAX3082/MAX3085/MAX3088 Pin Configuration and Typical Half-Duplex Operating Circuit
______________________________________________________________________________________
13
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
Detailed Description
The MAX3080–MAX3089 high-speed transceivers for
RS-485/RS-422 communication contain one driver and
one receiver. These devices feature fail-safe circuitry,
which guarantees a logic-high receiver output when the
receiver inputs are open or shorted, or when they are
connected to a terminated transmission line with all
drivers disabled (see Fail-Safe section). The MAX3080/
MAX3081/MAX3082 feature reduced slew-rate drivers
that minimize EMI and reduce reflections caused by
improperly terminated cables, allowing error-free data
transmission up to 115kbps (see Reduced EMI and
Reflections section). The MAX3083/MAX3084/MAX3085
offer higher driver output slew-rate limits, allowing
transmit speeds up to 500kbps. The MAX3086/
MAX3087/MAX3088’s driver slew rates are not limited,
making transmit speeds up to 10Mbps possible. The
MAX3089’s slew rate is selectable between 115kbps,
500kbps, and 10Mbps by driving a selector pin with a
three-state driver.
VCC
The MAX3082/MAX3085/MAX3088 are half-duplex
transceivers, while the MAX3080/MAX3081/MAX3083/
MAX3084/MAX3086/MAX3087 are full-duplex transceivers. The MAX3089 is selectable between half- and
full-duplex communication by driving a selector pin
high or low, respectively.
All of these parts operate from a single +5V supply.
Drivers are output short-circuit current limited. Thermal
shutdown circuitry protects drivers against excessive
power dissipation. When activated, the thermal shutdown circuitry places the driver outputs into a highimpedance state.
Receiver Input Filtering
The receivers of the MAX3080–MAX3085, and the
MAX3089 when operating in 115kbps or 500kbps
mode, incorporate input filtering in addition to input
hysteresis. This filtering enhances noise immunity with
differential signals that have very slow rise and fall
times. Receiver propagation delay increases by 20%
due to this filtering.
RE
MAX3089
A
RD
TOP VIEW
B
14 V CC
H/F
1
RO
2
RE
3
DE
4
11 B
DI
5
10 Z
13 RXP
MAX3089
12 A
SRL
6
9
Y
GND
7
8
TXP
H/F
Z
TXP
DIP/SO
Y
DI
NOTE: SWITCH POSITIONS
INDICATED FOR H/F = GND
GND
DE
SRL
Figure 4. MAX3089 Pin Configuration and Functional Diagram
14
______________________________________________________________________________________
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
TEST POINT
RECEIVER
OUTPUT
CRL
15pF
R
VOD
R
1k
VCC
S1
1k
VOC
S2
Z
Figure 5. Driver DC Test Load
Figure 6. Receiver Enable/Disable Timing Test Load
Fail-Safe
The MAX3080 family guarantees a logic-high receiver
output when the receiver inputs are shorted or open, or
when they are connected to a terminated transmission
line with all drivers disabled. This is done by setting the
receiver threshold between -50mV and -200mV. If the
differential receiver input voltage (A-B) is greater than
or equal to -50mV, RO is logic high. If A-B is less than
or equal to -200mV, RO is logic low. In the case of a
terminated bus with all transmitters disabled, the
receiver’s differential input voltage is pulled to 0V by
the termination. With the receiver thresholds of the
MAX3080 family, this results in a logic high with a 50mV
minimum noise margin. Unlike previous fail-safe
devices, the -50mV to -200mV threshold complies with
the ±200mV EIA/TIA-485 standard.
MAX3089 Programming
The MAX3089 has several programmable operating
modes. Transmitter rise and fall times are programmable between 2500ns, 750ns, and 25ns, resulting in
maximum data rates of 115kbps, 500kbps, and
10Mbps, respectively. To select the desired data rate,
drive SRL to one of three possible states by using a
three-state driver, by connecting it to VCC or GND, or
by leaving it unconnected. For 115kbps operation, set
the three-state device in high-impedance mode or
leave SRL unconnected. For 500kbps operation, drive
SRL high or connect it to VCC. For 10Mbps operation,
drive SRL low or connect it to GND. SRL can be
changed during operation without interrupting data
communications.
Occasionally, twisted-pair lines are connected backward from normal orientation. The MAX3089 has two
pins that invert the phase of the driver and the receiver
to correct for this problem. For normal operation, drive
TXP and RXP low, connect them to ground, or leave
them unconnected (internal pull-down). To invert the
driver phase, drive TXP high or connect it to VCC. To
invert the receiver phase, drive RXP high or connect it
to V CC. Note that the receiver threshold is positive
when RXP is high.
The MAX3089 can operate in full- or half-duplex mode.
Drive the H/F pin low, leave it unconnected (internal
pull-down), or connect it to GND for full-duplex operation, and drive it high for half-duplex operation. In fullduplex mode, the pin configuration of the driver and
receiver is the same as that of a MAX3080 (Figure 4). In
half-duplex mode, the receiver inputs are switched to
the driver outputs, connecting outputs Y and Z to inputs
A and B, respectively. In half-duplex mode, the internal
full-duplex receiver input resistors are still connected to
pins 11 and 12.
Applications Information
256 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12kΩ
(one-unit load), and the standard driver can drive up to
32 unit loads. The MAX3080 family of transceivers have
a 1/8-unit-load receiver input impedance (96kΩ), allowing up to 256 transceivers to be connected in parallel
on one communication line. Any combination of these
devices and/or other RS-485 transceivers with a total of
32 unit loads or less can be connected to the line.
Reduced EMI and Reflections
The MAX3080–MAX3085, and MAX3089 with SRL = VCC
or unconnected, are slew-rate limited, minimizing EMI
and reducing reflections caused by improperly terminated cables. Figure 14 shows the driver output waveform and its Fourier analysis of a 20kHz signal
transmitted by a MAX3086/MAX3087/MAX3088, and
MAX3089 with SRL = GND. High-frequency harmonic
______________________________________________________________________________________
15
MAX3080–MAX3089
Y
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
3V
DE
DI
CL1
Y
OUTPUT
UNDER TEST
VID
Z
CL
CL2
S2
Figure 7. Driver Timing Test Circuit
Figure 8. Driver Enable/Disable Timing Test Load
3V
3V
DI
1.5V
0V
DE
1.5V
1.5V
1.5V
0V
tPHL
tPLH
1/2 VO
tZL(SHDN), tZL
Z
tLZ
Y, Z
VO
2.3V OUTPUT NORMALLY LOW
VOL
Y
1/2 VO
VO
VDIFF 0V
-VO
VCC
S1
500Ω
RDIFF
10%
VDIFF = V (Y) - V (Z)
VOH -0.5V
2.3V
90%
tR
OUTPUT NORMALLY HIGH
Y, Z
90%
VOL +0.5V
0V
10%
tZH(SHDN), tZH
tF
tHZ
tSKEW = | tPLH - tPHL |
Figure 9. Driver Propagation Delays
Figure 10. Driver Enable and Disable Times (except
MAX3081/MAX3084/MAX3087)
3V
RE
RO
VOL
1V
A
-1V
B
1.5V
1.5V
0V
VOH
1.5V
OUTPUT
tPHL
tPLH
1.5V
tZL(SHDN), tZL
tLZ
VCC
RO
1.5V OUTPUT NORMALLY LOW
RO
1.5V
VOL + 0.5V
INPUT
OUTPUT NORMALLY HIGH
VOH - 0.5V
0V
tZH(SHDN), tZH
Figure 11. Receiver Propagation Delays
16
tHZ
Figure 12. Receiver Enable and Disable Times (except
MAX3081/MAX3084/MAX3087)
______________________________________________________________________________________
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
MAX3080/3089 FIG-14
MAX3080–MAX3089
B
ATE
VID
RECEIVER
OUTPUT
RR
20dB/div
A
0Hz
MAX3080/3089 FIG-16
A
B
20dB/div
0Hz
100kHz/div
1MHz
Figure 14. Driver Output Waveform and FFT Plot of
MAX3086/MAX3087/MAX3088, and MAX3089 with
SRL = GND, Transmitting a 20kHz Signal
MAX3080/3089 FIG-15
Figure 13. Receiver Propagation Delay Test Circuit
100kHz/div
1MHz
A
B
20dB/div
0Hz
100kHz/div
1MHz
Figure 15. Driver Output Waveform and FFT Plot of
MAX3083/MAX3084/MAX3085, and MAX3089
with SRL = VCC, Transmitting a 20kHz Signal
Figure 16. Driver Output Waveform and FFT Plot of
MAX3080/MAX3081/MAX3082, and MAX3089
with SRL = Unconnected, Transmitting a 20kHz Signal
components with large amplitudes are evident. Figure
15 shows the same signal displayed for a MAX3083/
MAX3084/MAX3085, and MAX3089 with SRL = VCC),
transmitting under the same conditions. Figure 15’s
high-frequency harmonic components are much lower
in amplitude, compared with Figure 14’s, and the potential for EMI is significantly reduced. Figure 16
shows the same signal displayed for a MAX3080/
MAX3081/MAX3082, and MAX3089 with SRL = unconnected, transmitting under the same conditions. Figure
16’s high-frequency harmonic components are even
lower.
In general, a transmitter’s rise time relates directly to the
length of an unterminated stub, which can be driven with
only minor waveform reflections. The following equation
expresses this relationship conservatively:
Length = tRISE / (10 x 1.5ns/ft)
where tRISE is the transmitter’s rise time.
For example, the MAX3080’s rise time is typically
1320ns, which results in excellent waveforms with a stub
length up to 90 feet. A system can work well with longer
unterminated stubs, even with severe reflections, if the
waveform settles out before the UART samples them.
______________________________________________________________________________________
17
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
MAX3080/3089 FIG-18
MAX3080/MAX3081/MAX3083/
MAX3084/MAX3086/MAX3087/
MAX3089 (FULL DUPLEX)
DI
5V/div
VA - VB
1V/div
RO
5V/div
A
RO
RE
R
120Ω
B
DATA IN
DE
Z
DI
D
120Ω
Y
DATA OUT
5µs/div
NOTE: RE AND DE ON MAX3080/MAX3083/MAX3086/MAX3089 ONLY.
Figure 17. Line Repeater for MAX3080/MAX3081/
MAX3083/MAX3084/MAX3086/MAX3087, and MAX3089
in Full-Duplex Mode
Low-Power Shutdown Mode
(except MAX3082/MAX3085/MAX3088)
Low-power shutdown mode is initiated by bringing both
RE high and DE low. In shutdown, the devices typically
draw only 1nA of supply current.
RE and DE may be driven simultaneously; the parts are
guaranteed not to enter shutdown if RE is high and DE
is low for less than 50ns. If the inputs are in this state
for at least 600ns, the parts are guaranteed to enter
shutdown.
Enable times t ZH and t ZL in the Switching Characteristics tables assume the part was not in a lowpower shutdown state. Enable times tZH(SHDN) and
tZL(SHDN) assume the parts were shut down. It takes
drivers and receivers longer to become enabled from
low-power shutdown mode (tZH(SHDN), tZH(SHDN)) than
from driver/receiver-disable mode (tZH, tZL).
Driver Output Protection
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus contention. The first, a foldback current limit on the output
stage, provides immediate protection against short circuits over the whole common-mode voltage range (see
Typical Operating Characteristics). The second, a thermal shutdown circuit, forces the driver outputs into a
high-impedance state if the die temperature becomes
excessive.
18
Figure 18. MAX3080/MAX3081/MAX3082, and MAX3089
with SRL = Unconnected, System Differential Voltage at 50kHz
Driving 4000 feet of Cable
Line Length vs. Data Rate
The RS-485/RS-422 standard covers line lengths up to
4000 feet. For line lengths greater than 4000 feet, use
the repeater application shown in Figure 17.
Figures 18, 19, and 20 show the system differential voltage for the parts driving 4000 feet of 26AWG twistedpair wire at 110kHz into 120Ω loads.
Typical Applications
The MAX3082/MAX3085/MAX3088/MAX3089 transceivers are designed for bidirectional data communications on multipoint bus transmission lines. Figures 21
and 22 show typical network applications circuits.
These parts can also be used as line repeaters, with
cable lengths longer than 4000 feet, as shown in Figure 17.
To minimize reflections, the line should be terminated at
both ends in its characteristic impedance, and stub
lengths off the main line should be kept as short as
possible. The slew-rate-limited MAX3082/MAX3085,
and the two modes of the MAX3089, are more tolerant
of imperfect termination.
______________________________________________________________________________________
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
MAX3080/3089 FIG-20
DI
5V/div
DI
5V/div
VA - VB
1V/div
VA - VB
1V/div
RO
5V/div
RO
5V/div
2µs/div
1µs/div
Figure 19. MAX3083/MAX3084/MAX3085, and MAX3089 with
SRL = VCC, System Differential Voltage at 50kHz Driving 4000
feet of Cable
Figure 20. MAX3086/MAX3087/MAX3088, and MAX3089 with
SRL = GND, System Differential Voltage at 200kHz Driving
4000 feet of Cable
120Ω
120Ω
DE
B
B
DI
D
D
DI
DE
RO
RE
A
B
A
B
A
A
R
R
RO
RE
R
MAX3082
MAX3085
MAX3088
MAX3089 (HALF-DUPLEX)
R
D
D
DI
DE
RO RE
DI
DE
RO RE
Figure 21. Typical Half-Duplex RS-485 Network
______________________________________________________________________________________
19
MAX3080–MAX3089
MAX3080/3089 FIG-19
MAX3080–MAX3089
Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
A
R
RO
RE
Y
120Ω
120Ω
D
B
Z
Z
B
DE
DI
DE
DI
120Ω
D
Y
120Ω
Z
Y
B
A
Y
Z
R
A
DE RE RO
RE
RO
A
R
D
D
DI
B
R
DI
NOTE: RE AND DE ON MAX3080/MAX3083/MAX3086/MAX3089 ONLY.
DE RE RO
MAX3080
MAX3081
MAX3083
MAX3084
MAX3086
MAX3087
MAX3089 (FULL-DUPLEX)
Figure 22. Typical Full-Duplex RS-485 Network
Ordering Information (continued)
PART
MAX3081CPA
MAX3081CSA
MAX3081EPA
MAX3081ESA
MAX3082CPA
MAX3082CSA
MAX3082EPA
MAX3082ESA
MAX3083CPD
MAX3083CSD
MAX3083EPD
MAX3083ESD
MAX3084CPA
MAX3084CSA
MAX3084EPA
MAX3084ESA
MAX3085CPA
MAX3085CSA
MAX3085EPA
MAX3085ESA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
PART
MAX3086CPD
MAX3086CSD
MAX3086EPD
MAX3086ESD
MAX3087CPA
MAX3087CSA
MAX3087EPA
MAX3087ESA
MAX3088CPA
MAX3088CSA
MAX3088EPA
MAX3088ESA
MAX3089CPD
MAX3089CSD
MAX3089EPD
MAX3089ESD
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
20
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is a registered trademark of Maxim Integrated Products.