MAX3080E_V01 [MAXIM]
±15kVESD-Protected,Fail-Safe,High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers;
| 型号： | MAX3080E_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | ±15kVESD-Protected,Fail-Safe,High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers |
| 文件： | 总20页 (文件大小：242K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1800; Rev 1; 5/06
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
–MAX3089E
General Description
Features
The MAX3080E–MAX3089E are 15ꢀk electrostatic dis-
charge (ESD)-protected, high-speed transceivers for RS-
485/RS-422 communication that 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
MAX3080E/MAX3081E/MAX3082E feature reduced
slew-rate drivers that minimize EMI and reduce reflec-
tions caused by improperly terminated cables, allowing
error-free data transmission up to 115ꢀbps. The
MAX3083E/MAX3084E/MAX3085E offer higher driver
output slew-rate limits, allowing transmit speeds up to
500ꢀbps. The MAX3086E/MAX3087E/ MAX3088Es’ dri-
ver slew rates are not limited, maꢀing transmit speeds
up to 10Mbps possible. The MAX3089E’s slew rate is
selectable between 115ꢀbps, 500ꢀbps, and 10Mbps by
driving a selector pin with a single three-state driver. All
devices feature enhanced ESD protection. All transmitter
outputs and receiver inputs are protected to 15ꢀk
using the Human Body Model.
♦ ESD Protection for RS-485 I/O Pins
15kV, Human Body Model
♦ True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
♦ Enhanced Slew-Rate Limiting Facilitates
Error-Free Data Transmission
(MAX3080E–MAX3085E/MAX3089E)
♦ 1nA Low-Current Shutdown Mode (Except
MAX3081E/MAX3084E/MAX3087E)
♦ Pin-Selectable Full/Half-Duplex Operation
(MAX3089E)
♦ Phase Controls to Correct for Twisted-Pair
Reversal (MAX3089E)
♦ 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 Networꢀs
These transceivers typically draw 375µA of supply
current when unloaded, or when fully loaded with the dri-
vers disabled.
All devices have a 1/8-unit-load receiver input impedance
that allows up to 256 transceivers on the bus. The
MAX3082E/MAX3085E/MAX3088E are intended for half-
duplex communications, while the MAX3080E/MAX3081E/
MAX3083E/MAX3084E/MAX3086E/MAX3087E are
intended for full-duplex communications. The MAX3089E
is selectable between half-duplex and full-duplex opera-
tion. It also features independently programmable
receiver and transmitter output phase via separate pins.
Ordering Information
PART
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 SO
MAX3080ECSD
MAX3080ECPD
MAX3080EESD
MAX3080EEPD
14 Plastic DIP
14 SO
14 Plastic DIP
Ordering Information continued at end of data sheet.
Selector Guide
Data
Rate
(Mbps)
Slew-
Rate
Limited
Low-
Power
Shutdown
Receiver/ Quiescent Transceivers
Industry-
Standard
Pinout
Half/Full
Duplex
Pin
Count
Part
Driver
Current
(µA)
On
Enable
Bus
MAX3080E
MAX3081E
MAX3082E
MAX3083E
MAX3084E
MAX3085E
MAX3086E
MAX3087E
MAX3088E
Full
Full
Half
Full
Full
Half
Full
Full
Half
0.115
0.115
0.115
0.5
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
Yes
No
375
375
375
375
375
375
375
375
375
375
256
256
256
256
256
256
256
256
256
256
14
8
75180
75179
75176
75180
75179
75176
75180
75179
75176
75180*
Yes
Yes
No
Yes
Yes
No
8
14
8
0.5
0.5
Yes
Yes
No
Yes
Yes
No
8
10
14
8
10
No
10
No
Yes
Yes
Yes
Yes
8
MAX3089E Selectable Selectable Selectable
14
*Pin compatible with 75180, with additional features implemented using pins 1, 6, 8, and 13.
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
ABSOLUTE MAXIMUM RATINGS
Supply koltage (k ) ............................................................+7k
Continuous Power Dissipation
CC
Control Input koltage (RE, DE)...................-0.3k to (k
Special Input koltage
(H/F, SRL, TXP, RXP)..............................-0.3k to (k
Driver Input koltage (DI).............................-0.3k to (k
Driver Output koltage (A, B, Y, Z)........................................ 13k
Receiver Input koltage (A, B) .............................................. 13k
Receiver Input koltage, Full Duplex (A, B) .......................... 25k
+ 0.3k)
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_EC_ _ ...................................................0°C to +70°C
MAX308_EE_ _ ................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
+ 0.3k)
+ 0.3k)
CC
CC
Receiver Output koltage (RO)....................-0.3k to (k
+ 0.3k)
CC
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
(k
= +5k 5%, T = T
A
to T
, unless otherwise noted. Typical values are at k
= +5k and T = +25°C.) (Note 1)
CC A
CC
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DRIVER
Differential Driver Output
(No Load)
k
k
Figure 5
5
k
k
–MAX3089E
OD1
Figure 5, R = 50Ω (RS-422)
Figure 5, R = 27Ω (RS-485)
2.0
1.5
Differential Driver Output
OD2
Change-in-Magnitude of
Differential Output koltage
(Note 2)
Δk
Figure 5, R = 50Ω or R = 27Ω
0.2
k
OD
Driver Common-Mode Output
koltage
k
Figure 5, R = 50Ω or R = 27Ω
Figure 5, R = 50Ω or R = 27Ω
3
k
k
OC
Change-in-Magnitude of
Common-Mode koltage (Note 2)
Δk
0.2
OC
Input High koltage
Input Low koltage
k
2.0
10
k
k
DE, DI, RE, H/F, TXP, RXP
DE, DI, RE, H/F, TXP, RXP
IH1
k
0.8
IL1
MAX3080E–MAX3085E, and MAX3089E with
SRL = k or unconnected
DI Input Hysteresis
SRL Input Current
k
HYS
100
mk
µA
CC
I
I
2
DE, DI, RE
IN1
40
H/F, TXP, RXP, internal pulldown
IN2
Input High koltage
Input Middle koltage
Input Low koltage
k
SRL
k
- 0.8
k
k
k
IH2
CC
k
IM2
SRL (Note 3)
SRL
0.4k
0.6k
CC
CC
k
0.8
75
IL2
SRL = k
CC
SRL Input Current
I
µA
µA
µA
IN3
SRL = GND (Note 3)
-75
k
IN
k
IN
k
IN
k
IN
= 12k
= -7k
= 12k
= -7k
125
-75
DE = GND,
Input Current (A and B)
I
IN4
k
CC
= GND or 5.25k
125
Output Leaꢀage (Y and Z)
Full Duplex
DE = GND,
= GND or 5.25k
I
O
k
CC
-100
-250
-7k ≤ k
0k ≤ k
0k ≤ k
≤ k
CC
≤ 12k
≤ k
CC
OUT
Driver Short-Circuit Output
Current (Note 4)
k
OD1
250
mA
OUT
OUT
25
2
_______________________________________________________________________________________
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
–MAX3089E
DC ELECTRICAL CHARACTERISTICS (continued)
(k
= +5k 5%, T = T
A
to T
, unless otherwise noted. Typical values are at k
= +5k and T = +25°C.) (Note 1)
CC A
CC
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RECEIVER
Receiver Differential Threshold
koltage
k
-7k ≤ k
≤ 12k
-200
-125
25
-50
mk
TH
CM
Receiver Input Hysteresis
Receiver Output High koltage
Receiver Output Low koltage
Δk
mk
k
k
TH
k
OH
I
I
= -4mA, k = -50mk
= 4mA, k = -200mk
k
-1.5
O
ID
CC
k
OL
0.4
1
O
ID
Three-State Output Current at
Receiver
I
0.4k ≤ k ≤ 2.4k
µA
ꢀΩ
mA
OZR
O
Receiver Input Resistance
R
-7k ≤ k
≤ 12k
96
IN
CM
Receiver Output Short-Circuit
Current
I
0k ≤ k
≤ k
CC
7
95
OSR
RO
SUPPLY CURRENT
No load,
RE = DI = GND
DE = k
430
900
CC
µA
µA
or k , SRL = k
CC
CC
DE = GND
DE = k
375
475
420
600
1000
800
Supply Current
I
CC
No load,
RE = DI = GND
CC
DE = GND
or k , SRL = GND
CC
Supply Current in Shutdown
Mode
I
DE = GND, k = k
CC
0.001
15
10
µA
ꢀk
SHDN
RE
ESD Protection for Y, Z, A, B
Human Body Model
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: Δk
and Δk
are the changes in k
and k , respectively, when the DI input changes state.
OD
OC
OD OC
Note 3: The SRL pin is internally biased to k / 2 by a 100ꢀΩ/100ꢀΩ resistor-divider. It is guaranteed to be k / 2 if left
CC
CC
unconnected.
Note 4: Maximum current level applies to peaꢀ current just prior to foldbacꢀ-current limiting; minimum current level applies during
current limiting.
_______________________________________________________________________________________
3
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
SWITCHING CHARACTERISTICS—MAX3080E/MAX3081E/MAX3082E, and MAX3089E
with SRL = Unconnected
(k
CC
= +5k 5%, T = T
A
to T
, unless otherwise noted. Typical values are at k = +5k and T = +25°C.)
CC A
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
MIN
500
500
TYP
2030
2030
MAX
2600
2600
UNITS
t
t
DPLH
DPHL
Figures 7 and 9, R
= 54Ω,
= 54Ω,
= 54Ω,
DIFF
Driver Input-to-Output
ns
C
= C = 100pF
L1
L2
Driver Output Sꢀew
Figures 7 and 9, R
DIFF
t
-3
200
ns
ns
DSKEW
C
L1
= C = 100pF
t
- t
L2
| DPLH DPHL |
Figures 7 and 9, R
DIFF
Driver Rise or Fall Time
t , t
DR DF
667
115
1320
2500
C
L1
= C = 100pF
L2
Maximum Data Rate
f
ꢀbps
ns
MAX
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
t
Figures 8 and 10, C = 100pF, S2 closed
3500
3500
100
DZH
L
t
Figures 8 and 10, C = 100pF, S1 closed
ns
DZL
DLZ
DHZ
L
t
Figures 8 and 10, C = 15pF, S1 closed
ns
L
t
Figures 8 and 10, C = 15pF, S2 closed
100
ns
L
t
t
,
Figures 11 and 13; k
≥ 2.0k;
rise and fall time of k ≤ 15ns
RPLH
|
ID |
Receiver Input to Output
127
3
200
30
ns
ns
RPHL
ID
–MAX3089E
t
- t
Differential
Figures 11 and 13; k
≥ 2.0k;
rise and fall time of k ≤ 15ns
| RPLH RPHL |
Receiver Sꢀew
|
ID |
t
RSKD
ID
Receiver Enable to Output Low
t
Figures 6 and 12, C = 100pF, S1 closed
20
20
20
50
50
50
ns
ns
ns
RZL
L
Receiver Enable to Output High
Receiver Disable Time from Low
t
Figures 6 and 12, C = 100pF, S2 closed
L
RZH
t
Figures 6 and 12, C = 100pF, S1 closed
L
RLZ
Receiver Disable Time from
High
t
Figures 6 and 12, C = 100pF, S2 closed
L
20
50
ns
ns
ns
RHZ
Time to Shutdown
t
(Note 5)
50
200
600
SHDN
Driver Enable from Shutdown to
Output High
t
t
Figures 8 and 10, C = 15pF, S2 closed
6000
DZH(SHDN)
L
Driver Enable from Shutdown to
Output Low
t
Figures 8 and 10, C = 15pF, S1 closed
6000
3500
3500
ns
ns
ns
DZL(SHDN)
L
Receiver Enable from Shutdown-
to-Output High
Figures 6 and 12, C = 100pF, S2 closed
RZH(SHDN)
L
Receiver Enable from Shutdown-
to-Output Low
t
Figures 6 and 12, C = 100pF, S1 closed
L
RZL(SHDN)
4
_______________________________________________________________________________________
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
–MAX3089E
SWITCHING CHARACTERISTICS—MAX3083E/MAX3084E/MAX3085E, and MAX3089E with
SRL = V
CC
CC
(k = +5k 5%, T = T
to T , unless otherwise noted. Typical values are at k = +5k and T = +25°C.)
MAX CC A
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
250
250
TYP
720
720
MAX
1000
1000
UNITS
t
t
DPLH
DPHL
Figures 7 and 9, R
= 54Ω,
= 54Ω,
= 54Ω,
DIFF
Driver Input-to-Output
ns
C
= C = 100pF
L1
L2
Driver Output Sꢀew
Figures 7 and 9, R
DIFF
t
-3
100
750
ns
ns
DSKEW
C
L1
= C = 100pF
t
- t
L2
| DPLH DPHL |
Figures 7 and 9, R
DIFF
Driver Rise or Fall Time
t
t
200
500
530
DR, DF
C
L1
= C = 100pF
L2
Maximum Data Rate
f
ꢀbps
ns
MAX
Driver Enable to Output High
Driver Enable to Output Low
t
Figures 8 and 10, C = 100pF, S2 closed
2500
2500
100
DZH
L
t
Figures 8 and 10, C = 100pF, S1 closed
ns
DZL
DLZ
DHZ
L
Driver Disable Time from Low
Driver Disable Time from High
t
Figures 8 and 10, C = 15pF, S1 closed
ns
L
t
Figures 8 and 10, C = 15pF, S2 closed
100
ns
L
t
t
,
Figures 11 and 13; k
≥ 2.0k;
ID
|
RPLH
|
Receiver Input to Output
127
3
200
30
ns
ns
rise and fall time of k ≤ 15ns
RPHL
ID
t
- t
Differential
Figures 11 and 13; k
rise and fall time of k ≤ 15ns
ID
≥ 2.0k;
ID
|
RPLH RPHL
|
|
|
t
RSKD
Receiver Sꢀew
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable Time from Low
t
Figures 6 and 12, C = 100pF, S1 closed
20
20
20
50
50
50
ns
ns
ns
RZL
L
t
Figures 6 and 12, C = 100pF, S2 closed
L
RZH
t
Figures 6 and 12, C = 100pF, S1 closed
L
RLZ
Receiver Disable Time from
High
t
Figures 6 and 12, C = 100pF, S2 closed
L
20
50
ns
RHZ
Time to Shutdown
t
(Note 5)
50
200
600
ns
ns
SHDN
Driver Enable from
Shutdown-to-Output High
t
t
Figures 8 and 10, C = 15pF, S2 closed
4500
DZH(SHDN)
L
Driver Enable from
Shutdown-to-Output Low
t
Figures 8 and 10, C = 15pF, S1 closed
4500
ns
DZL(SHDN)
L
Receiver Enable from
Shutdown-to-Output High
Figures 6 and 12, C = 100pF, S2 closed
3500
3500
ns
ns
RZH(SHDN)
L
Receiver Enable from
Shutdown-to-Output Low
t
Figures 6 and 12, C = 100pF, S1 closed
L
RZL(SHDN)
_______________________________________________________________________________________
5
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
SWITCHING CHARACTERISTICS—MAX3086E/MAX3087E/MAX3088E, and MAX3089E with
SRL = GND
(k
CC
= +5k 5%, T = T
A
to T
, unless otherwise noted. Typical values are at k = +5k and T = +25°C.)
CC A
MIN
MAX
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
34
MAX
60
UNITS
t
t
DPLH
DPHL
Figures 7 and 9, R
= 54Ω,
= 54Ω,
= 54Ω,
DIFF
Driver Input-to-Output
ns
C
= C = 100pF
L1
L2
34
60
Driver Output Sꢀew
Figures 7 and 9, R
DIFF
t
-2.5
14
10
25
ns
ns
DSKEW
C
L1
= C = 100pF
t
- t
L2
| DPLH DPHL |
Figures 7 and 9, R
DIFF
Driver Rise or Fall Time
t
t
DR, DF
C
L1
= C = 100pF
L2
Maximum Data Rate
f
10
Mbps
ns
MAX
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
t
Figures 8 and 10, C = 100pF, S2 closed
150
150
100
100
DZH
L
t
Figures 8 and 10, C = 100pF, S1 closed
ns
DZL
DLZ
DHZ
L
t
Figures 8 and 10, C = 15pF, S1 closed
ns
L
t
Figures 8 and 10, C = 15pF, S2 closed
ns
L
t
t
,
Figures 11 and 13; k
≥ 2.0k;
rise and fall time of k ≤ 15ns
RPLH
|
ID |
Receiver Input-to-Output
106
0
150
10
ns
ns
RPHL
ID
–MAX3089E
t
- t
Differential
Figures 11 and 13; k
≥ 2.0k;
rise and fall time of k ≤ 15ns
| RPLH RPHL |
Receiver Sꢀew
|
ID |
t
RSKD
ID
Receiver Enable to Output Low
t
Figures 6 and 12, C = 100pF, S1 closed
20
20
20
50
50
50
ns
ns
ns
RZL
L
Receiver Enable to Output High
Receiver Disable Time from Low
t
Figures 6 and 12, C = 100pF, S2 closed
L
RZH
t
Figures 6 and 12, C = 100pF, S1 closed
L
RLZ
Receiver Disable Time from
High
t
Figures 6 and 12, C = 100pF, S2 closed
L
20
50
ns
RHZ
Time to Shutdown
t
(Note 5)
50
200
600
250
ns
ns
SHDN
Driver Enable from
Shutdown-to-Output High
t
t
Figures 8 and 10, C = 15pF, S2 closed
L
DZH(SHDN)
Driver Enable from
Shutdown-to-Output Low
t
Figures 8 and 10, C = 15pF, S1 closed
250
ns
DZL(SHDN)
L
Receiver Enable from
Shutdown-to-Output High
Figures 6 and 12, C = 100pF, S2 closed
3500
3500
ns
ns
RZH(SHDN)
L
Receiver Enable from
Shutdown-to-Output Low
t
Figures 6 and 12, C = 100pF, S1 closed
L
RZL(SHDN)
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
_______________________________________________________________________________________
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
–MAX3089E
Typical Operating Characteristics
(k
CC
= +5k, T = +25°C, unless otherwise noted.)
A
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
OUTPUT CURRENT
vs. RECEIVER OUTPUT LOW VOLTAGE
OUTPUT CURRENT
vs. RECEIVER OUTPUT HIGH VOLTAGE
525
500
60
30
25
20
15
10
5
A: MAX3086E/MAX3087E/MAX3088E,
MAX3089E WITH
50
40
30
20
10
0
SRL = GND
475
DE = V
CC
450
425
400
375
350
A
DE = GND
B
A
B: MAX3080E–MAX3085E,
MAX3089E WITH
B
325
300
SRL = OPEN OR V
CC
0
-60 -40 -20
0
20 40 60 80 100
0
1
2
3
4
5
0
1
2
3
4
5
TEMPERATURE (°C)
OUTPUT LOW VOLTAGE (V)
OUTPUT HIGH VOLTAGE (V)
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
SHUTDOWN CURRENT
vs. TEMPERATURE
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
4.5
4.4
4.3
20
18
0.50
0.45
0.40
I
RO
= 8mA
I
RO
= 8mA
16
14
12
0.35
0.30
0.25
4.2
4.1
10
8
6
4
2
4.0
3.9
3.8
0.20
0.15
0.10
0
-60 -40 -20
0
20 40 60 80 100
-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
140
112
2.20
2.15
2.10
2.05
2.00
1.95
C
= 100pF
LOAD
C
= 100pF
LOAD
R = 54Ω
t
110
108
135
130
106
104
102
100
98
125
120
115
96
94
1.90
-60 -40 -20
0
20 40 60 80 100
-60 -40 -20
0
20 40 60 80 100
-60 -40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
7
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
Typical Operating Characteristics (continued)
(k
CC
= +5k, T = +25°C, unless otherwise noted.)
A
DRIVER PROPAGATION DELAY
(500kbps MODE) vs. TEMPERATURE
DRIVER PROPAGATION DELAY
(10Mbps MODE) vs. TEMPERATURE
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
920
880
60
55
50
45
1.90
1.89
R = 54Ω
t
R = 54Ω
R = 54Ω
t
t
840
800
760
720
680
640
600
560
520
1.88
1.87
1.86
1.85
1.84
1.83
40
35
30
25
20
-60 -40 -20
0
20 40 60 80 100
-60 -40 -20
0
20 40 60 80 100
-60 -40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
–MAX3089E
100
-100
-90
-80
-70
140
120
10
1
100
-60
-50
80
60
-40
-30
40
20
0
0.1
-20
-10
0
0.01
-8
-6
-4
-2
0
2
4
6
0
1
2
3
4
5
0
2
4
6
8
10
12
OUTPUT HIGH VOLTAGE (V)
DIFFERENTIAL OUTPUT VOLTAGE (V)
OUTPUT LOW VOLTAGE (V)
8
_______________________________________________________________________________________
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
–MAX3089E
Typical Operating Characteristics (continued)
(k
CC
= +5k, T = +25°C, unless otherwise noted.)
A
RECEIVER PROPAGATION DELAY
MAX3086E/MAX3087E/MAX3088E AND MAX3089E
RECEIVER PROPAGATION DELAY
MAX3080E–MAX3085E AND MAX3089E
WITH SRL = GND
WITH SRL = OPEN OR V
CC
MAX3080/3089 TYP-18
MAX3080/3089 TYP-17
V - V
2V/div
5V/div
V - V
2V/div
5V/div
A
B
A
B
RO
RO
50ns/div
50ns/div
DRIVER PROPAGATION DELAY
MAX3080E/MAX3081E/MAX3082E AND MAX3089E
WITH SRL = OPEN
MAX3080/3089 TYP-20
DI
5V/div
V - V
2.5V/div
Y
Z
2μs/div
DRIVER PROPAGATION DELAY
DRIVER PROPAGATION DELAY
MAX3086E/MAX3087E/MAX3088E AND MAX3089E
MAX3083E/MAX3084E/MAX3085E AND MAX3089E
WITH SRL = GND
WITH SRL = V
CC
MAX3080/3089 TYP-21
MAX3080/3089 TYP-22
DI
5V/div
DI
5V/div
V - V
2.5V/div
V - V
2.5V/div
Y
Z
Y
Z
50ns/div
500ns/div
_______________________________________________________________________________________
9
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
Pin Description
PIN
MAX3080E MAX3081E MAX3082E
MAX3083E MAX3084E MAX3085E
MAX3086E MAX3087E MAX3088E
MAX3089E
NAME
FUNCTION
HALF-
FULL-DUPLEX
DUPLEX
FULL-
DUPLEX DUPLEX
MODE
HALF-
DEVICES
DEVICES
MODE
Half/Full-Duplex Selector Pin. Connect H/F to k
duplex mode; connect to GND or leave unconnected for
full-duplex mode.
for half-
CC
—
2
—
2
—
1
1
1
H/F
Receiver Output. When RE is low and if A - B ≥ -50mk,
RO will be high; if A - B ≤ -200mk, RO will be low.
2
3
2
3
RO
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.
3
4
—
—
2
3
RE
Driver Output Enable. Drive DE high to enable driver out-
puts. These outputs are high impedance when DE is low.
Drive RE high and DE low to enter low-power shutdown
mode.
–MAX3089E
4
4
DE
Driver Input. With DE high, a low on DI forces noninverting
output low and inverting output high. Similarly, a high on DI
forces non-inverting output high and inverting output low.
5
3
4
5
6
5
6
DI
Slew-Rate-Limit Selector Pin. Connect SRL to GND for
10Mbps communication rate; connect to k
for
CC
—
—
—
SRL
500ꢀbps communication rate. Leave unconnected for
115ꢀbps communication rate.
6, 7
—
4
5
7
8
7
8
GND
TXP
Ground
Transmitter Phase. Connect TXP to GND, or leave floating
for normal transmitter phase/polarity. Connect to k
—
—
to
CC
invert the transmitter phase/polarity.
9
5
—
—
9
—
9
Y
Y
Noninverting Driver Output
Noninverting Receiver Input and Noninverting Driver
Output*
—
—
—
10
—
11
—
—
6
—
—
—
—
7
10
—
11
—
—
—
10
—
11
—
Z
Z
B
B
B
Inverting Driver Output
—
7
Inverting Receiver Input and Inverting Driver Output*
Inverting Receiver Input
—
—
Receiver Input Resistors*
Inverting Receiver Input and Inverting Driver Output
10 ______________________________________________________________________________________
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
–MAX3089E
Pin Description (continued)
PIN
MAX3080E MAX3081E MAX3082E
MAX3083E MAX3084E MAX3085E
MAX3086E MAX3087E MAX3088E
MAX3089E
NAME
FUNCTION
HALF-
FULL-
DUPLEX
MODE
HALF-
DUPLEX
MODE
FULL-DUPLEX
DUPLEX
DEVICES
DEVICES
12
—
8
—
—
12
—
—
A
A
Noninverting Receiver Input
—
12
Receiver Input Resistors*
Noninverting Receiver Input and Noninverting Driver
Output
—
—
6
—
—
A
Receiver Phase. Connect RXP to GND, or leave uncon-
nected for normal receiver phase/polarity. Connect to
—
—
—
13
13
RXP
k
CC
to invert the receiver phase/polarity.
14
1
8
14
—
14
—
k
Positive Supply 4.75k ≤ k
≤ 5.25k
CC
CC
1, 8, 13
—
—
N.C.
Not Connected. Not internally connected.
*(MAX3089E 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
MAX3080E/MAX3083E/MAX3086E
TRANSMITTING
MAX3081E/MAX3084E/MAX3087E
TRANSMITTING
INPUT
OUTPUTS
INPUTS
OUTPUTS
DI
1
Z
0
1
Y
1
0
DE
1
DI
1
Z
0
1
Y
RE
X
1
0
0
X
1
0
0
0
X
X
High-Z
High-Z
1
0
Shutdown
RECEIVING
INPUTS
OUTPUT
A - B
≥ -0.05k
RO
1
RECEIVING
INPUTS
OUTPUT
≤ -0.2k
0
DE
X
A - B
RO
RE
Open/shorted
1
0
0
0
1
1
≥ -0.05k
1
X
≤ -0.2k
0
1
X
Open/shorted
1
X
X
High-Z
Shutdown
0
X = Don’t care
Shutdown mode, driver and receiver outputs high impedance
______________________________________________________________________________________ 11
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
Function Tables (continued)
MAX3082E/MAX3085E/MAX3088E
MAX3089E
TRANSMITTING
INPUTS
DE
TRANSMITTING
INPUTS
OUTPUTS
OUTPUTS
TXP
0
DI
1
Z
Y
RE
X
DE
1
DI
1
B/Z
A/Y
RE
X
1
1
1
1
0
0
0
1
0
1
1
0
0
X
0
1
0
X
1
0
1
X
1
1
0
0
1
0
0
X
X
High-Z
High-Z
1
X
0
1
0
Shutdown
X
0
X
X
High-Z
High-Z
X
1
Shutdown
RECEIVING
INPUTS
OUTPUT
DE
X
A - B
RO
RE
RECEIVING
INPUTS
0
0
0
1
1
≥ -0.05k
1
OUTPUT
X
≤ -0.2k
0
1
RXP
0
DE
X
X
X
X
0
A - B
≥ -0.05k
≤ -0.2k
≥ -0.05k
≤ -0.2k
X
Y - Z
X
RO
1
H/F
0
RE
X
Open/shorted
0
0
0
0
0
0
0
0
–MAX3089E
1
X
X
High-Z
Shutdown
0
0
X
0
0
0
1
X
0
0
1
X
1
X = Don’t care
1
0
≥ -0.05k
≤ -0.2k
≥ -0.05k
≤ -0.2k
1
Shutdown mode, driver and receiver outputs high impedance
1
0
0
X
0
1
1
0
X
0
1
1
0
X
1
Open/
shorted
0
1
0
1
0
0
1
1
0
0
0
0
X
0
X
0
X
1
1
0
0
Open/
shorted
X
Open/
shorted
X
Open/
shorted
X
X
X
X
X
1
1
1
0
X
X
X
X
High-Z
Shutdown
12 ______________________________________________________________________________________
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
–MAX3089E
V
TOP VIEW
CC
DE
V
CC
RE
0.1μF
4
14
MAX3080E
MAX3083E
MAX3086E
N.C.
RO
1
2
3
4
5
6
7
14
V
CC
9
Y
R
13 N.C.
5
Rt
DI
RO
DI
D
R
10
RE
12
11
10
9
A
Z
DE
B
12
11
A
2
Rt
DI
Z
RO
NC
R
D
D
GND
GND
Y
B
1, 8, 13
8
N.C.
3
6, 7
GND
DIP/SO
RE
GND DE
Figure 1. MAX3080E/MAX3083E/MAX3086E Pin Configuration and Typical Full-Duplex Operating Circuit
TOP VIEW
0.1μF
V
CC
MAX3081E
MAX3084E
MAX3087E
V
1
CC
Y
Z
5
6
3
2
Rt
DI
RO
DI
D
R
V
1
2
3
4
R
8
7
6
5
A
B
Z
Y
CC
RO
DI
8
7
A
B
Rt
RO
R
D
GND
D
DIP/SO
4
GND
GND
Figure 2. MAX3081E/MAX3084E/MAX3087E Pin Configuration and Typical Full-Duplex Operating Circuit
TOP VIEW
0.1μF
MAX3082E
DE
MAX3085E
MAX3088E
8
7
1
DI
R
R
RO
RE
DE
DI
1
2
3
4
RO
RE
DE
DI
8
7
6
5
V
CC
V
D
CC
2
3
B
B
A
B
Rt
Rt
6 A
5
A
RO
4
R
D
D
GND
GND
RE
NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM DIAGRAMS. REFER TO PINS A AND B WHEN DE IS HIGH.
DIP/SO
Figure 3. MAX3082E/MAX3085E/MAX3088E Pin Configuration and Typical Half-Duplex Operating Circuit
______________________________________________________________________________________ 13
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
the termination. With the receiver thresholds of the
Detailed Description
MAX3080E family, this results in a logic high with a
The MAX3080E–MAX3089E high-speed transceivers for
50mk minimum noise margin. Unliꢀe previous fail-safe
RS-485/RS-422 communication contain one driver and
devices, the -50mk to -200mk threshold complies with
one receiver. These devices feature fail-safe circuitry,
the 200mk EIA/TIA-485 standard.
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 the Fail-Safe section). The
MAX3080E/MAX3081E/MAX3082E feature reduced
slew-rate drivers that minimize EMI and reduce reflec-
tions caused by improperly terminated cables, allowing
error-free data transmission up to 115ꢀbps (see the
Reduced EMI and Reflections section). The
MAX3083E/MAX3084E/MAX3085E offer higher driver
output slew-rate limits, allowing transmit speeds up to
500ꢀbps. The MAX3086E/MAX3087E/MAX3088E’s dri-
ver slew rates are not limited, maꢀing transmit speeds
up to 10Mbps possible. The MAX3089E’s slew rate is
selectable between 115ꢀbps, 500ꢀbps, and 10Mbps
by driving a selector pin with a three-state driver.
MAX3089E Programming
The MAX3089E has several programmable operating
modes. Transmitter rise and fall times are programma-
ble between 2500ns, 750ns, and 25ns, resulting in
maximum data rates of 115ꢀbps, 500ꢀbps, 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 k
or GND, or
CC
by leaving it unconnected. For 115ꢀbps operation, set
the three-state device in high-impedance mode or
leave SRL unconnected. For 500ꢀbps operation, drive
SRL high or connect it to k . For 10Mbps operation,
CC
drive SRL low or connect it to GND. SRL can be
changed during operation without interrupting data
communications.
The MAX3082E/MAX3085E/MAX3088E are half-duplex
transceivers, while the MAX3080E/MAX3081E/
MAX3083E/MAX3084E/MAX3086E/MAX3087E are full-
duplex transceivers. The MAX3089E is selectable
between half- and full-duplex communication by driving
a selector pin high or low, respectively.
Occasionally, twisted-pair lines are connected bacꢀ-
ward from normal orientation. The MAX3089E 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 pulldown). To invert the dri-
–MAX3089E
ver phase, drive TXP high or connect it to k . To
CC
All of these parts operate from a single +5k supply.
Drivers are output short-circuit current limited. Thermal
shutdown circuitry protects drivers against excessive
power dissipation. When activated, the thermal shut-
down circuitry places the driver outputs into a high-
impedance state.
invert the receiver phase, drive RXP high or connect it
to k . Note that the receiver threshold is positive
CC
when RXP is high.
The MAX3089E can operate in full- or half-duplex
mode. Drive the H/F pin low, leave it unconnected
(internal pulldown), or connect it to GND for full-duplex
operation, and drive it high for half-duplex operation. In
full-duplex mode, the pin configuration of the driver and
receiver is the same as that of a MAX3080E (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.
Receiver Input Filtering
The receivers of the MAX3080E–MAX3085E, and the
MAX3089E when operating in 115ꢀbps or 500ꢀbps
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.
Fail-Safe
The MAX3080E 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 -50mk and -200mk. If the
differential receiver input voltage (A - B) is greater than
or equal to -50mk, RO is logic high. If A - B is less than
or equal to -200mk, RO is logic low. In the case of a
terminated bus with all transmitters disabled, the
receiver’s differential input voltage is pulled to 0k by
±±15k ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The driver outputs and receiver inputs of the
MAX3080E–MAX3089E family have extra protection
against static electricity. Maxim’s engineers have
developed state-of-the-art structures to protect these
pins against ESD of 15ꢀk without damage.
14 ______________________________________________________________________________________
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
–MAX3089E
V
CC
RE
MAX3089E
A
B
RD
TOP VIEW
H/F
RO
1
2
3
4
5
6
7
14
V
CC
RXP
13 RXP
RE
12
11
10
9
A
MAX3089E
DE
B
H/F
Z
DI
Z
TXP
SRL
GND
Y
8
TXP
DIP/SO
Y
DI
NOTE: SWITCH POSITIONS
INDICATED FOR H/F = GND
GND DE
SRL
Figure 4. MAX3089E Pin Configuration and Functional Diagram
Y
1k
TEST POINT
RECEIVER
OUTPUT
R
V
CC
S1
S2
C
RL
1k
V
OD
15pF
R
V
OC
Z
Figure 5. Driver DC Test Load
Figure 6. Receiver Enable/Disable Timing Test Load
The ESD-protected pins are tested with reference to the
ground pin in a powered-down condition. They are test-
ed to 15ꢀk using the Human Body Model.
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the test device
through a 1.5ꢀΩ resistor.
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Machine Model
The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. The objective is to emulate the stress caused
when I/O pins are contacted by handling equipment
during test and assembly. All pins require this protec-
tion, not just RS-485 inputs and outputs.
Human Body Model
Figure 14a shows the Human Body Model, and Figure
14b shows the current waveform it generates when dis-
______________________________________________________________________________________ 15
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
3V
DE
C
L1
V
CC
Y
Z
S1
S2
R
500Ω
DIFF
DI
OUTPUT
UNDER TEST
V
OD2
C
L
C
L2
Figure 7. Driver Timing Test Circuit
Figure 8. Driver Enable and Disable Timing Test Load
5V
DE
5V
DI
1.5V
1.5V
1.5V
1.5V
V
0
0
t
t
DPHL
DPLH
1/2 V
O
–MAX3089E
t
t
, t
DLZ
DZL(SHDN) DZL
Z
Y, Z
V
2.3V
+0.5V
-0.5V
O
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
OL
V
OL
Y
1/2 V
O
V
DIFF
= V (Y) - V (Z)
Y, Z
V
O
0
V
OH
2.3V
V
DIFF
90%
90%
0
10%
10%
-V
O
t
, t
t
DHZ
DZH(SHDN) DZH
t
t
DF
DR
t
t
- t
SKEW = | DPLH DPHL |
Figure 9. Driver Propagation Delays
Figure 10. Driver Enable and Disable Times (Except
MAX3081E/MAX3084E/MAX3087E)
5V
RE
1.5V
1.5V
0
V
OH
t
t
, t
RLZ
RZL(SHDN) RZL
RO
V
RO
1.5V
1.5V
CC
V
OUTPUT
OL
1.5V
V
V
+ 0.5V
- 0.5V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
OL
t
t
RPLH
RPHL
A
B
1V
-1V
INPUT
RO
1.5V
OH
0
t
, t
t
RHZ
RZH(SHDN) RZH
Figure 11. Receiver Propagation Delays
Figure 12. Receiver Enable and Disable Times (Except
MAX3081E/MAX3084E/MAX3087E)
16 ______________________________________________________________________________________
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
–MAX3089E
R
C
R
D
1MΩ
1500Ω
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
B
A
RECEIVER
OUTPUT
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
V
R
ID
ATE
C
100pF
STORAGE
CAPACITOR
s
SOURCE
Figure 13. Receiver Propagation Delay Test Circuit
Figure 14a. Human Body ESD Test Model
I
P
100%
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
AMPERES
20dB/div
36.8%
10%
0
TIME
0
t
RL
t
DL
CURRENT WAVEFORM
0Hz
100kHz/div
1MHz
Figure 14b. Human Body Current Waveform
Figure 15. Driver Output Waveform and FFT Plot of
MAX3086E/MAX3087E/MAX3088E, and MAX3089E with
SRL = GND, Transmitting a 20ꢀHz Signal
A
B
A
B
20dB/div
20dB/div
0Hz
100kHz/div
1MHz
0Hz
100kHz/div
1MHz
Figure 16. Driver Output Waveform and FFT Plot of
MAX3083E/MAX3084E/MAX3085E, and MAX3089E
Figure 17. Driver Output Waveform and FFT Plot of
MAX3080E/MAX3081E/MAX3082E, and MAX3089E
with SRL = Unconnected, Transmitting a 20ꢀHz Signal
with SRL = k
Transmitting a 20ꢀHz Signal
CC,
______________________________________________________________________________________ 17
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
MAX3080/3089 FIG-18
MAX3080E/MAX3081E/MAX3083E/
MAX3084E/MAX3086E/MAX3087E/
DI
5V/div
MAX3089E (FULL DUPLEX)
A
B
120Ω
RO
RE
R
DATA IN
V - V
1V/div
5V/div
DE
A
B
Z
DI
120Ω
DATA OUT
D
Y
RO
5μs/div
NOTE: RE AND DE ON MAX3080E/MAX3083E/MAX3086E/MAX3089E ONLY.
Figure 18. Line Repeater for MAX3080E/MAX3081E/MAX3083E/
MAX3084E/MAX3086E/MAX3087E, and MAX3089E in Full-Duplex
Mode
Figure 19. MAX3080E/MAX3081E/MAX3082E, and MAX3089E
with SRL = Unconnected, System Differential koltage at 50ꢀHz
Driving 4000ft of Cable
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:
Applications Information
–MAX3089E
216 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12ꢀΩ
(one-unit load), and the standard driver can drive up to
32 unit loads. The MAX3080E family of transceivers
have a 1/8-unit-load receiver input impedance (96ꢀΩ),
allowing up to 256 transceivers to be connected in par-
allel 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.
Length = t
/ (10 x 1.5ns/ft)
RISE
where t
is the transmitter’s rise time.
RISE
For example, the MAX3080E’s rise time is typically
1320ns, which results in excellent waveforms with a stub
length up to 90 feet. A system can worꢀ well with longer
unterminated stubs, even with severe reflections, if the
waveform settles out before the UART samples them.
Reduced EMI and Reflections
Low-Power Shutdown Mode
(Except MAX3082E/MAX3081E/MAX3088E)
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.
The MAX3080E–MAX3085E, and MAX3089E with SRL =
CC
k
or unconnected, are slew-rate limited, minimizing
EMI and reducing reflections caused by improperly ter-
minated cables. Figure 15 shows the driver output
waveform and its Fourier analysis of a 20ꢀHz signal
transmitted by a MAX3086E/MAX3087E/MAX3088E,
and MAX3089E with SRL = GND. High-frequency har-
monic components with large amplitudes are evident.
Figure 16 shows the same signal displayed for a
MAX3083E/MAX3084E/MAX3085E, and MAX3089E with
SRL = kCC, transmitting under the same conditions.
Figure 16’s high-frequency harmonic components are
much lower in amplitude, compared with Figure 15’s,
and the potential for EMI is significantly reduced. Figure
17 shows the same signal displayed for a MAX3080E/
MAX3081E/MAX3082E, and MAX3089E with SRL =
unconnected, transmitting under the same conditions.
Figure 17’s high-frequency harmonic components are
even lower.
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
and t
in the Switching Char-
ZL
ZH
acteristics tables assume the part was not in a low-
power shutdown state. Enable times t and
ZH(SHDN)
t
assume the parts were shut down. It taꢀes
ZL(SHDN)
drivers and receivers longer to become enabled from
low-power shutdown mode (t , t ) than
ZH(SHDN) ZL(SHDN)
from driver/receiver-disable mode (t , t ).
ZH ZL
18 ______________________________________________________________________________________
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
–MAX3089E
MAX3080/3089 FIG-19
MAX3080/3089 FIG-20
DI
5V/div
DI
5V/div
V - V
1V/div
5V/div
V - V
1V/div
5V/div
A
B
A
B
RO
RO
2μs/div
1μs/div
Figure 20. MAX3083E/MAX3084E/MAX3085E, and MAX3089E
Figure 21. MAX3086E/MAX3087E/MAX3088E, and MAX3089E
with SRL = GND, System Differential koltage at 200ꢀHz Driving
4000ft of Cable
with SRL = k
System Differential koltage at 50ꢀHz Driving
CC,
4000ft of Cable
120Ω
120Ω
DE
B/Z*
B
DI
D
D
DI
DE
B
A
A/Y*
B
A
A
RO
RE
RO
RE
R
R
R
R
D
D
MAX3082E
MAX3085E
MAX3088E
DI
DE
RO RE
DI
DE RO RE
*MAX3089E (HALF-DUPLEX)
Figure 22. Typical Half-Duplex RS-485 Networꢀ
Driver Output Protection
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus con-
tention. The first, a foldbacꢀ current limit on the output
stage, provides immediate protection against short cir-
cuits over the whole common-mode voltage range (see
Typical Operating Characteristics). The second, a ther-
mal shutdown circuit, forces the driver outputs into a
high-impedance state if the die temperature becomes
excessive.
Typical Applications
The MAX3082E/MAX3085E/MAX3088E/MAX3089E
transceivers are designed for bidirectional data com-
munications on multipoint bus transmission lines.
Figures 22 and 23 show typical networꢀ applications
circuits. These parts can also be used as line repeaters,
with cable lengths longer than 4000 feet, as shown in
Figure 18.
To minimize reflections, the line should be terminated at
both ends in its characteristic impedance, and stub
lengths off the main line should be ꢀept as short as
possible. The slew-rate-limited MAX3082E/MAX3085E,
and the two modes of the MAX3089E, are more tolerant
of imperfect termination.
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 18.
Figures 19, 20, and 21 show the system differential volt-
age for the parts driving 4000 feet of 26AWG twisted-
pair wire at 110ꢀHz into 120Ω loads.
______________________________________________________________________________________ 19
±±15k ESD-Protected, Fail-Safe, High-Speed (±0Mbps),
Slew-Rate-Limited RS-481/RS-422 Transceivers
A
Y
120Ω
120Ω
RO
RE
R
DI
D
B
Z
Z
DE
DE
B
RE
RO
120Ω
120Ω
DI
R
D
Y
A
Y
Z
B
A
Y
Z
B
A
R
R
D
D
MAX3080E
MAX3081E
MAX3083E
MAX3084E
MAX3086E
MAX3087E
DI
DE RE RO
DI
DE RE RO
NOTE: RE AND DE ON MAX3080E/MAX3083E/MAX3086E/MAX3089E ONLY.
Figure 23. Typical Full-Duplex RS-485 Networꢀ
MAX3089E (FULL-DUPLEX)
–MAX3089E
Ordering Information (continued)
PART
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 SO
PART
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 SO
MAX3086ECSD
MAX3086ECPD
MAX3086EESD
MAX3086EEPD
MAX3087ECSA
MAX3087ECPA
MAX3087EESA
MAX3087EEPA
MAX3088ECSA
MAX3088ECPA
MAX3088EESA
MAX3088EEPA
MAX3089ECSD
MAX3089ECPD
MAX3089EESD
MAX3089EEPD
MAX3081ECSA
MAX3081ECPA
MAX3081EESA
MAX3081EEPA
MAX3082ECSA
MAX3082ECPA
MAX3082EESA
MAX3082EEPA
MAX3083ECSD
MAX3083ECPD
MAX3083EESD
MAX3083EEPD
MAX3084ECSA
MAX3084ECPA
MAX3084EESA
MAX3084EEPA
MAX3085ECSA
MAX3085ECPA
MAX3085EESA
MAX3085EEPA
14 Plastic DIP
14 SO
8 Plastic DIP
8 SO
14 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
14 SO
8 Plastic DIP
8 SO
14 Plastic DIP
14 SO
8 Plastic DIP
14 SO
14 Plastic DIP
8 SO
14 Plastic DIP
14 SO
8 Plastic DIP
8 SO
14 Plastic DIP
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
Revision History
8 Plastic DIP
Pages changed at Rev 1: 1, 19, 20
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 __________________Maxim Integrated Products, ±20 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 2006 Maxim Integrated Products
is a registered trademarꢀ of Maxim Integrated Products, Inc.
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