MAX3086ESD-T [MAXIM]
LINE TRANSCEIVER, PDSO14, SOP-14;
| 型号： | MAX3086ESD-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | LINE TRANSCEIVER, PDSO14, SOP-14 |
| 文件： | 总20页 (文件大小：276K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1138; Rev 1; 12/97
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
–MAX3089
Ge n e ra l De s c rip t io n
Fe a t u re s
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 reflec-
tions caused by improperly terminated cables, allowing
e rror-fre e d a ta tra ns mis s ion up to 115kb p s . The
MAX3083/MAX3084/MAX3085 offer higher driver out-
put 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 10Mb p s p os s ib le . The MAX3089’s s le w ra te is
selectable between 115kbps, 500kbps, and 10Mbps
b y d riving a s e le c tor p in with a s ing le thre e -s ta te
driver.
♦ 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
Ap p lic a t io n s
RS-422/RS-485 Communications
Level Translators
These transceivers typically draw 375µA of supply
current when unloaded, or when fully loaded with the
drivers disabled.
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
All devices have a 1/8-unit-load receiver input imped-
ance that allows up to 256 transceivers on the bus. The
MAX3082/MAX3085/MAX3088 are intended for half-
duplex communications, while the MAX3080/MAX3081/
MAX3083/MAX3084/MAX3086/MAX3087 are intended
for full-duplex communications. The MAX3089 is selec-
table between half-duplex and full-duplex operation. It
also features independently programmable receiver
and transmitter output phase via separate pins.
Ord e rin g In fo rm a t io n
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 Plastic DIP
14 SO
MAX3080CPD
MAX3080CSD
MAX3080EPD
MAX3080ESD
14 Plastic DIP
14 SO
Ordering Information continued on last page.
S e le c t io n Ta b le
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
MAX3080
MAX3081
MAX3082
MAX3083
MAX3084
MAX3085
MAX3086
MAX3087
MAX3088
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
MAX3089 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 & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V ) ............................................................+7V
Continuous Power Dissipation
CC
Control Input Voltage (RE, DE)...................-0.3V to (V + 0.3V)
Special Input Voltage
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
CC
(H/F, SRL, TXP, RXP)..................................-0.3V to (V + 0.3V)
CC
Driver Input Voltage (DI).............................-0.3V to (V + 0.3V)
CC
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 (V + 0.3V)
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
(V = +5V ± 5%, T = T
to T , unless otherwise noted. Typical values are at V = +5V and T = +25°C.) (Note 1)
MAX CC A
CC
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
–MAX3089
DRIVER
Differential Driver Output
(no load)
V
Figure 5
5
V
V
OD1
Figure 5, R = 50Ω (RS-422)
Figure 5, R = 27Ω (RS-485)
2.0
1.5
Differential Driver Output
V
OD2
Change in Magnitude of
Differential Output Voltage
(Note 2)
∆V
Figure 5, R = 50Ω or R = 27Ω
0.2
V
OD
Driver Common-Mode Output
Voltage
V
Figure 5, R = 50Ω or R = 27Ω
Figure 5, R = 50Ω or R = 27Ω
3
V
V
OC
Change In Magnitude of
Common-Mode Voltage (Note 2)
∆V
0.2
OC
Input High Voltage
Input Low Voltage
V
2.0
10
V
V
DE, DI, RE, H/F, TXP, RXP
DE, DI, RE, H/F, TXP, RXP
IH1
V
IL1
0.8
MAX3080–MAX3085, and MAX3089 with
SRL = V or unconnected
CC
DI Input Hysteresis
SRL Input Current
V
HYS
100
mV
µA
I
IN1
±2
40
DE, DI, RE
I
IN2
H/F, TXP, RXP, internal pull-down
Input High Voltage
Input Middle Voltage
Input Low Voltage
V
SRL
V
- 0.8
V
V
V
IH2
CC
V
IM2
SRL (Note 3)
SRL
0.4V
0.6V
CC
CC
V
IL2
0.8
75
SRL = V
CC
SRL Input Current
I
IN3
µA
µA
µA
SRL = GND (Note 3)
-75
V
= 12V
= -7V
= 12V
= -7V
125
-75
IN
Input Current (A and B)
Full Duplex
DE = GND,
V
CC
I
IN4
= GND or 5.25V
V
IN
V
IN
125
Output Leakage (Y and Z)
Full Duplex
DE = GND,
= GND or 5.25V
I
O
V
CC
V
IN
-100
-250
-7V ≤ V
≤ V
CC
OUT
Driver Short-Circuit Output
Current (Note 4)
V
OD1
250
mA
0V ≤ V
≤ 12V
OUT
±25
0V ≤ V
≤ V
CC
OUT
2
_______________________________________________________________________________________
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
–MAX3089
DC ELECTRICAL CHARACTERISTICS (continued)
(V = +5V ±5%, T = T
to T
, unless otherwise noted. Typical values are at V = +5V and T = +25°C.) (Note 1)
CC
A
MIN
MAX
CC
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RECEIVER
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
V
-7V ≤ V ≤ 12V
-200
-125
25
-50
mV
TH
CM
∆V
mV
V
TH
Receiver Output High Voltage
Receiver Output Low Voltage
V
OH
I
O
= -4mA, V = -50mV
V
-1.5
ID
CC
V
OL
I
O
= 4mA, V = -200mV
0.4
±1
V
ID
Three-State Output Current at
Receiver
I
0.4V ≤ V ≤ 2.4V
µA
kΩ
OZR
O
Receiver Input Resistance
R
-7V ≤ V ≤ 12V
96
±7
IN
CM
Receiver Output Short-Circuit
Current
I
0V ≤ V ≤ V
CC
±95
mA
OSR
RO
SUPPLY CURRENT
No load,
RE = DI = GND
DE = V
430
375
475
420
900
600
CC
µA
DE = GND
DE = V
or V , SRL = V
CC
CC
Supply Current
I
CC
No load,
RE = DI = GND
1000
800
CC
µA
µA
DE = GND
or V , SRL = GND
CC
Supply Current in Shutdown
Mode
I
DE = GND, V = V
CC
0.001
10
SHDN
RE
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: ∆V and ∆V are the changes in V and V , respectively, when the DI input changes state.
OD
OC
OD
OC
Note 3: The SRL pin is internally biased to V / 2 by a 100kΩ/100kΩ resistor divider. It is guaranteed to be V / 2 if left
CC
CC
unconnected.
Note 4: Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during
current limiting.
_______________________________________________________________________________________
3
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
SWITCHING CHARACTERISTICS—MAX3080–MAX3082, and MAX3089 with
SRL = Unconnected
(V = +5V ±5%, T = T
to T , unless otherwise noted. Typical values are at V = +5V and T = +25°C.)
MAX CC A
CC
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
2030
2030
MAX
2600
2600
UNITS
t
t
500
500
DPLH
DPHL
Figures 7 and 9, R
= 54Ω,
= 54Ω,
= 54Ω,
DIFF
Driver Input to Output
ns
C
= C = 100pF
L2
L1
Driver Output Skew
Figures 7 and 9, R
DIFF
t
-3
±200
2500
ns
ns
DSKEW
C
= C = 100pF
L2
t
- t
L1
| DPLH DPHL |
Figures 7 and 9, R
DIFF
Driver Rise or Fall Time
t
, t
DR DF
667
115
1320
C
= C = 100pF
L2
L1
Maximum Data Rate
f
kbps
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
–MAX3089
t
t
,
Figures 11 and 13;
rise and fall time of V ≤ 15ns
V
≥ 2.0V;
RPLH
|
ID |
Receiver Input to Output
127
3
200
±30
ns
ns
RPHL
ID
t
- t
Differential
Figures 11 and 13;
rise and fall time of V ≤ 15ns
V
ID |
ID
≥ 2.0V;
| RPLH RPHL |
Receiver Skew
|
t
RSKD
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
_______________________________________________________________________________________
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
–MAX3089
SWITCHING CHARACTERISTICS—MAX3083–MAX3085, and MAX3089 with SRL = V
CC
(V = +5V ±5%, T = T
to T , unless otherwise noted. Typical values are at V = +5V and T = +25°C.)
MAX CC A
CC
A
MIN
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
720
720
MAX
1000
1000
UNITS
t
t
250
250
DPLH
DPHL
Figures 7 and 9, R
= 54Ω,
= 54Ω,
= 54Ω,
DIFF
Driver Input to Output
ns
C
= C = 100pF
L2
L1
Driver Output Skew
Figures 7 and 9, R
DIFF
t
-3
±100
750
ns
ns
DSKEW
C
= C = 100pF
L2
t
- t
L1
| DPLH DPHL |
Figures 7 and 9, R
DIFF
Driver Rise or Fall Time
t
t
200
500
530
DR, DF
C
= C = 100pF
L2
L1
Maximum Data Rate
f
kbps
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
2500
2500
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;
rise and fall time of V ≤ 15ns
V
≥ 2.0V;
ID
|
RPLH
|
Receiver Input to Output
127
3
200
±30
ns
ns
RPHL
ID
t
- t
Differential
Figures 11 and 13;
rise and fall time of V ≤ 15ns
ID
V ≥ 2.0V;
ID
|
RPLH RPHL
|
|
|
t
RSKD
Receiver Skew
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
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
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
SWITCHING CHARACTERISTICS—MAX3086–MAX3088, and MAX3089 with SRL = GND
(V = +5V ±5%, T = T
to T , unless otherwise noted. Typical values are at V = +5V and T = +25°C.)
MAX CC A
CC
A
MIN
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
L2
L1
34
60
Driver Output Skew
Figures 7 and 9, R
DIFF
t
-2.5
14
±10
25
ns
ns
DSKEW
C
= C = 100pF
L2
t
- t
L1
| DPLH DPHL |
Figures 7 and 9, R
DIFF
Driver Rise or Fall Time
t
t
DR, DF
C
= C = 100pF
L2
L1
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;
rise and fall time of V ≤ 15ns
V
≥ 2.0V;
RPLH
|
ID |
Receiver Input to Output
106
0
150
±10
ns
ns
–MAX3089
RPHL
ID
t
- t
Differential
Figures 11 and 13;
rise and fall time of V ≤ 15ns
V
ID |
ID
≥ 2.0V;
| RPLH RPHL |
Receiver Skew
|
t
RSKD
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
_______________________________________________________________________________________
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
–MAX3089
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(V = +5V, T = +25°C, unless otherwise noted.)
CC
A
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
OUTPUT CURRENT
vs. RECEIVER OUTPUT LOW VOLTAGE
OUTPUT CURRENT
vs. RECEIVER OUTPUT HIGH VOLTAGE
525
60
50
40
30
20
10
0
30
25
20
15
10
5
A: MAX3086–MAX3088,
MAX3089 WITH
SRL = GND
500
475
DE = V
CC
450
425
400
375
350
A
DE = GND
B
A
B: MAX3080–MAX3085,
MAX3089 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)
SHUTDOWN CURRENT
vs. TEMPERATURE
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
20
18
4.5
4.4
4.3
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
LOAD
= 100pF
C
LOAD
= 100pF
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
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = +5V, T = +25°C, unless otherwise noted.)
CC
A
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
DRIVER PROPAGATION DELAY
(500kbps MODE) vs. TEMPERATURE
DRIVER PROPAGATION DELAY
(10Mbps MODE) vs. TEMPERATURE
1.90
1.89
920
880
840
800
760
720
680
640
600
560
520
60
55
50
45
R = 54Ω
R = 54Ω
t
t
R = 54Ω
t
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
–MAX3089
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
DRIVER OUTPUT CURRENT
OUTPUT CURRENT vs.
OUTPUT CURRENT vs.
vs. DIFFERENTIAL OUTPUT VOLTAGE
DRIVER OUTPUT HIGH VOLTAGE
DRIVER OUTPUT LOW VOLTAGE
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
0
1
2
3
4
5
-8
-6
-4
-2
0
2
4
6
0
2
4
6
8
10
12
DIFFERENTIAL OUTPUT VOLTAGE (V)
OUTPUT HIGH VOLTAGE (V)
OUTPUT LOW VOLTAGE (V)
8
_______________________________________________________________________________________
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
–MAX3089
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = +5V, T = +25°C, unless otherwise noted.)
CC
A
RECEIVER PROPAGATION DELAY
MAX3080–MAX3085, AND MAX3089
RECEIVER PROPAGATION DELAY
MAX3086–MAX3088, AND MAX3089
WITH SRL = GND
WITH SRL = OPEN OR V
CC
MAX3080/3089 TYP-17
MAX3080/3089 TYP-18
V - V
2V/div
5V/div
A
B
V - V
2V/div
5V/div
A
B
RO
RO
50ns/div
50ns/div
DRIVER PROPAGATION DELAY
MAX3080/MAX3081/MAX3082, AND MAX3089
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
MAX3083/MAX3084/MAX3085, AND MAX3089
WITH SRL = V
MAX3086/MAX3087/MAX3088, AND MAX3089
WITH SRL = GND
CC
MAX3080/3089 TYP-21
MAX3080/3089 TYP-22
DI
5V/div
DI
5V/div
V - V
2.5V/div
V - V
Y Z
2.5V/div
Y
Z
500ns/div
50ns/div
_______________________________________________________________________________________
9
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
P in De s c rip t io n
PIN
MAX3080 MAX3081 MAX3082
MAX3083 MAX3084 MAX3085
MAX3086 MAX3087 MAX3088
MAX3089
NAME
FUNCTION
HALF-
FULL-
HALF-
FULL-DUPLEX
DUPLEX DUPLEX DUPLEX
DEVICES
DEVICES
MODE
MODE
Half/Full-Duplex Selector Pin. Connect H/F to V for half-duplex
mode; connect to GND or leave unconnected for full-duplex mode.
CC
—
—
2
—
1
1
H/F
Receiver Output. When RE is low and if A - B ≥ -50mV, RO will be
high; if A - B ≤ -200mV, RO will be low.
2
3
1
2
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
RE
DE
DI
–MAX3089
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.
4
5
3
4
4
5
4
5
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.
Slew-Rate-Limit Selector Pin. Connect SRL to GND for 10Mbps
—
6, 7
—
—
4
—
5
6
7
8
6
7
8
SRL communication rate; connect to V for 500kbps communication
CC
rate. Leave unconnected for 115kbps communication rate.
GND Ground
Transmitter Phase. Connect TXP to GND, or leave floating for normal
TXP transmitter phase/polarity. Connect to V to invert the transmitter
CC
—
—
phase/polarity.
9
5
—
—
—
—
—
—
7
9
—
9
Y
Y
Z
Z
B
B
B
Noninverting Driver Output
—
10
—
11
—
—
—
6
—
10
—
11
—
—
Noninverting Receiver Input and Noninverting Driver Output*
Inverting Driver Output
—
10
—
11
—
—
7
Inverting Receiver Input and Inverting Driver Output*
Inverting Receiver Input
—
—
Receiver Input Resistors*
Inverting Receiver Input and Inverting Driver Output
10 ______________________________________________________________________________________
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
–MAX3089
P in De s c rip t io n (c o n t in u e d )
PIN
MAX3080 MAX3081 MAX3082
MAX3083 MAX3084 MAX3085
MAX3086 MAX3087 MAX3088
MAX3089
NAME
FUNCTION
HALF-
FULL-
DUPLEX DUPLEX
MODE
12
HALF-
FULL-DUPLEX
DUPLEX
DEVICES
DEVICES
MODE
—
12
—
—
8
—
—
6
A
A
A
Noninverting Receiver Input
Receiver Input Resistors*
—
—
—
12
—
—
Noninverting Receiver Input and Noninverting Driver Output
Receiver Phase. Connect RXP to GND, or leave unconnected for
—
—
—
13
13
RXP normal transmitter phase/polarity. Connect to V to invert the
CC
receiver phase/polarity.
14
1
8
14
—
14
—
V
Positive Supply; 4.75V ≤ V ≤ 5.25V
CC
CC
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.
Fu n c t io n Ta b le s
MAX3080/MAX3083/MAX3086
MAX3081/MAX3084/MAX3087
TRANSMITTING
OUTPUTS
TRANSMITTING
INPUT
INPUTS
OUTPUTS
DI
1
Z
0
1
Y
1
DE
1
DI
1
Z
0
1
Y
RE
X
X
0
1
0
0
0
1
0
0
X
X
High-Z
High-Z
1
0
Shutdown
RECEIVING
INPUTS
OUTPUT
A-B
≥ -0.05V
RO
1
RECEIVING
INPUTS
OUTPUT
≤ -0.2V
0
DE
X
X
X
1
A-B
RO
RE
Open/shorted
1
0
0
0
1
1
≥ -0.05V
1
≤ -0.2V
0
1
Open/shorted
X
X
High-Z
Shutdown
0
X = Don’t care
Shutdown mode, driver and receiver outputs high impedance
______________________________________________________________________________________ 11
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
Fu n c t io n Ta b le s (c o n t in u e d )
MAX3082/MAX3085/MAX3088
MAX3089
TRANSMITTING
INPUTS
DE
TRANSMITTING
OUTPUTS
INPUTS
OUTPUTS
TXP
0
DI
1
Z
Y
RE
X
X
X
X
0
DE
1
DI
1
B/Z
A/Y
RE
X
X
0
1
1
1
1
0
0
0
1
0
1
1
0
0
0
1
0
1
0
1
1
1
0
0
1
0
X
X
High-Z
High-Z
1
0
1
0
Shutdown
X
X
X
X
High-Z
High-Z
1
Shutdown
RECEIVING
INPUTS
OUTPUT
DE
X
X
X
1
A-B
RO
RE
RECEIVING
INPUTS
0
0
0
1
1
≥ -0.05V
1
OUTPUT
–MAX3089
≤ -0.2V
0
1
RXP
0
DE
X
X
X
X
0
A-B
≥ -0.05V
≤ -0.2V
≥ -0.05V
≤ -0.2V
X
Y-Z
X
RO
1
H/F
0
RE
Open/shorted
0
0
0
0
0
0
0
0
X
X
High-Z
Shutdown
0
0
X
0
0
0
1
X
0
0
1
X
1
1
0
≥ -0.05V
≤ -0.2V
≥ -0.05V
≤ -0.2V
1
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
1
1
0
0
Open/
shorted
X
Open/
shorted
X
0
X
Open/
shorted
X
X
X
X
X
1
1
1
0
X
X
X
X
High-Z
Shutdown
X = Don’t care
Shutdown mode, driver and receiver outputs high impedance
12 ______________________________________________________________________________________
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
–MAX3089
V
CC
DE
V
CC
RE
TOP VIEW
0.1µF
4
14
MAX3080
MAX3083
MAX3086
N.C.
RO
RE
DE
DI
1
2
3
4
5
6
7
14
V
CC
9
Y
R
13 N.C.
5
Rt
DI
RO
DI
D
R
10
12
11
10
9
A
Z
B
12
11
A
2
Rt
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. MAX3080/MAX3083/MAX3086 Pin Configuration and Typical Full-Duplex Operating Circuit
0.1µF
V
CC
TOP VIEW
MAX3081
MAX3084
MAX3087
V
CC
1
Y
5
3
2
Rt
DI
RO
D
R
V
1
2
3
4
R
8
7
6
5
A
B
Z
CC
6 Z
RO
DI
8
7
A
Rt
RO
DI
R
D
GND
Y
D
B
DIP/SO
4
GND
GND
Figure 2. MAX3081/MAX3084/MAX3087 Pin Configuration and Typical Full-Duplex Operating Circuit
TOP VIEW
0.1µF
MAX3082
MAX3085
MAX3088
DE
D
DI
R
R
1
2
3
4
RO
RE
DE
DI
1
2
3
4
RO
RE
DE
DI
8
8
7
6
5
V
CC
B
Rt
V
CC
B
A
7
B
Rt
6
A
A
RO
R
D
D
5
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. MAX3082/MAX3085/MAX3088 Pin Configuration and Typical Half-Duplex Operating Circuit
______________________________________________________________________________________ 13
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
The MAX3082/MAX3085/MAX3088 a re ha lf-d up le x
De t a ile d De s c rip t io n
transceivers, while the MAX3080/MAX3081/MAX3083/
The MAX3080–MAX3089 high-speed transceivers for
MAX3084/MAX3086/MAX3087 are full-duplex trans-
RS-485/RS-422 communication contain one driver and
ceivers. The MAX3089 is selectable between half- and
one receiver. These devices feature fail-safe circuitry,
full-duplex communication by driving a selector pin
which guarantees a logic-high receiver output when the
high or low, respectively.
receiver inputs are open or shorted, or when they are
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 shut-
down circuitry places the driver outputs into a high-
impedance state.
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
offe r hig he r d rive r outp ut s le w-ra te limits , a llowing
tra ns mit s p e e d s up to 500kb p s . 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.
Re c e ive r In p u t Filt e rin g
The re c e ive rs of the MAX3080–MAX3085, a nd the
MAX3089 whe n op e ra ting in 115kb p s or 500kb p s
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.
–MAX3089
V
CC
RE
MAX3089
A
RD
TOP VIEW
B
H/F
RO
1
2
3
4
5
6
7
14
V
CC
13 RXP
RE
12
11
10
9
A
MAX3089
DE
B
H/F
TXP
Z
DI
Z
SRL
GND
Y
8
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 ______________________________________________________________________________________
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
–MAX3089
Y
1k
TEST POINT
R
R
RECEIVER
OUTPUT
V
CC
S1
S2
C
RL
V
OD
1k
15pF
V
OC
Z
Figure 5. Driver DC Test Load
Figure 6. Receiver Enable/Disable Timing Test Load
TXP and RXP low, connect them to ground, or leave
them unconnected (internal pull-down). To invert the
Fa il-S a fe
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
te rmina te d b us with a ll tra ns mitte rs d is a b le d , 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 nois e ma rg in. Unlike p re vious fa il-s a fe
devices, the -50mV to -200mV threshold complies with
the ±200mV EIA/TIA-485 standard.
driver phase, drive TXP high or connect it to V . To
CC
invert the receiver phase, drive RXP high or connect it
to V . Note that the receiver threshold is positive
CC
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 opera-
tion, 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 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.
MAX3 0 8 9 P ro g ra m m in g
The MAX3089 has several programmable operating
modes. Transmitter rise and fall times are programma-
ble between 2500ns, 750ns, and 25ns, resulting in
ma ximum d a ta ra te s of 115kb p s , 500kb p s , a nd
10Mbps, respectively. To select the desired data rate,
drive SRL to one of three possible states by using a
Ap p lic a t io n s In fo rm a t io n
2 5 6 Tra n s c e ive rs o n t h e Bu s
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), allow-
ing 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.
three-state driver, by connecting it to V
or GND, or
CC
by leaving it unconnected. For 115kbps operation, set
the thre e -s ta te d e vic e in hig h-imp e d a nc e mod e or
leave SRL unconnected. For 500kbps operation, drive
SRL high or connect it to V . For 10Mbps operation,
CC
d rive SRL low or c onne c t it to GND. SRL c a n b e
changed during operation without interrupting data
communications.
Re d u c e d EMI a n d Re fle c t io n s
The MAX3080–MAX3085, and MAX3089 with SRL = V
CC
or unconnected, are slew-rate limited, minimizing EMI
and reducing reflections caused by improperly termi-
nated cables. Figure 14 shows the driver output wave-
form a nd its Fourie r a na lys is of a 20kHz s ig na l
transmitted by a MAX3086/MAX3087/MAX3088, and
MAX3089 with SRL = GND. High-frequency harmonic
Occasionally, twisted-pair lines are connected back-
ward 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
______________________________________________________________________________________ 15
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
3V
DE
C
L1
V
CC
Y
Z
S1
S2
500Ω
R
DIFF
DI
OUTPUT
UNDER TEST
V
ID
C
L
C
L2
Figure 7. Driver Timing Test Circuit
Figure 8. Driver Enable/Disable Timing Test Load
–MAX3089
3V
3V
DE
DI
1.5V
1.5V
1.5V
1.5V
V
0V
0V
t
t
PHL
PLH
1/2 V
O
t
t
, t
LZ
ZL(SHDN) ZL
Z
Y, Z
2.3V
V
+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
0V
V
O
V
OH
2.3V
V
DIFF
90%
90%
0V
-V
10%
10%
O
t
, t
t
HZ
ZH(SHDN) ZH
t
R
t
F
t
t
- t
SKEW = | PLH PHL |
Figure 9. Driver Propagation Delays
Figure 10. Driver Enable and Disable Times (except
MAX3081/MAX3084/MAX3087)
3V
RE
1.5V
1.5V
0V
V
OH
RO
1.5V
1.5V
V
OL
OUTPUT
t
LZ
t
, t
ZL(SHDN) ZL
V
RO
CC
t
t
PLH
PHL
A
B
1V
1.5V
V
+ 0.5V
- 0.5V
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
OL
-1V
INPUT
RO
V
OH
1.5V
0V
t
, t
t
HZ
ZH(SHDN) ZH
Figure 11. Receiver Propagation Delays
Figure 12. Receiver Enable and Disable Times (except
MAX3081/MAX3084/MAX3087)
16 ______________________________________________________________________________________
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
–MAX3089
B
RECEIVER
OUTPUT
V
ID
R
20dB/div
ATE
A
0Hz
100kHz/div
1MHz
Figure 13. Receiver Propagation Delay Test Circuit
Figure 14. Driver Output Waveform and FFT Plot of
MAX3086/MAX3087/MAX3088, and MAX3089 with
SRL = GND, Transmitting a 20kHz Signal
A
A
B
B
20dB/div
20dB/div
0Hz
100kHz/div
1MHz
0Hz
100kHz/div
1MHz
Figure 15. Driver Output Waveform and FFT Plot of
MAX3083/MAX3084/MAX3085, and MAX3089
Figure 16. Driver Output Waveform and FFT Plot of
MAX3080/MAX3081/MAX3082, and MAX3089
with SRL = V
Transmitting a 20kHz Signal
with SRL = Unconnected, Transmitting a 20kHz Signal
CC,
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 poten-
tia l for EMI is s ig nific a ntly re d uc e d . Fig ure 16
s hows the s a me s ig na l d is p la ye d for a MAX3080/
MAX3081/MAX3082, and MAX3089 with SRL = uncon-
nected, 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 = t
/ (10 x 1.5ns/ft)
RISE
where t
is the transmitter’s rise time.
RISE
For e xa mp le , the MAX3080’s ris e time is typ ic a lly
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
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
MAX3080/3089 FIG-18
MAX3080/MAX3081/MAX3083/
MAX3084/MAX3086/MAX3087/
MAX3089 (FULL DUPLEX)
DI
5V/div
A
B
120Ω
RO
RE
R
DATA IN
V - V
1V/div
5V/div
A
B
DE
Z
DI
120Ω
DATA OUT
D
Y
RO
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
Figure 18. MAX3080/MAX3081/MAX3082, and MAX3089
with SRL = Unconnected, System Differential Voltage at 50kHz
Driving 4000 feet of Cable
–MAX3089
Lo w -P o w e r S h u t d o w n Mo d e
(e x c e p t MAX3 0 8 2 /MAX3 0 8 5 /MAX3 0 8 8 )
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.
Lin e Le n g t h vs . Da t a Ra t e
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 volt-
age for the parts driving 4000 feet of 26AWG twisted-
pair wire at 110kHz into 120Ω loads.
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.
Typ ic a l Ap p lic a t io n s
The MAX3082/MAX3085/MAX3088/MAX3089 tra ns -
ceivers are designed for bidirectional data communica-
tions on multipoint bus transmission lines. Figures 21
a nd 22 s how typ ic a l ne twork a p p lic a tions c irc uits .
These parts can also be used as line repeaters, with
cable lengths longer than 4000 feet, as shown in Figure 17.
Ena b le time s t
a nd t
in the Switc hing Cha r-
ZL
ZH
a c te ris tic s 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 takes
ZL(SHDN)
drivers and receivers longer to become enabled from
low-power shutdown mode (t , t ) than
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.
ZH(SHDN) ZH(SHDN)
from driver/receiver-disable mode (t , t ).
ZH ZL
Drive r Ou t p u t P ro t e c t io n
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus con-
tention. The first, a foldback 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.
18 ______________________________________________________________________________________
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
–MAX3089
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 19. MAX3083/MAX3084/MAX3085, and MAX3089 with
Figure 20. MAX3086/MAX3087/MAX3088, and MAX3089 with
SRL = GND, System Differential Voltage at 200kHz Driving
4000 feet of Cable
SRL = V
System Differential Voltage at 50kHz Driving 4000
CC,
feet of Cable
120Ω
120Ω
DE
B
B
DI
D
D
DI
DE
B
A
A
B
A
A
RO
RE
RO
RE
R
R
R
R
D
D
MAX3082
MAX3085
MAX3088
DE
DI
RO
RE
DI
RO RE
DE
MAX3089 (HALF-DUPLEX)
Figure 21. Typical Half-Duplex RS-485 Network
______________________________________________________________________________________ 19
Fa il-S a fe , Hig h -S p e e d (1 0 Mb p s ),
S le w -Ra t e -Lim it e d RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
A
Y
120Ω
120Ω
120Ω
RO
RE
R
DI
D
B
Z
Z
B
DE
DE
RE
RO
120Ω
DI
R
D
Y
A
Y
Z
B
A
Y
Z
B
A
R
R
D
DI
D
DI
MAX3080
MAX3081
MAX3083
MAX3084
MAX3086
MAX3087
DE RE RO
DE RE RO
NOTE: RE AND DE ON MAX3080/MAX3083/MAX3086/MAX3089 ONLY.
Figure 22. Typical Full-Duplex RS-485 Network
–MAX3089
MAX3089 (FULL-DUPLEX)
Ord e rin g In fo rm a t io n (c o n t in u e d )
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 Plastic DIP
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 Plastic DIP
8 SO
MAX3086CPD
MAX3086CSD
MAX3086EPD
MAX3086ESD
MAX3087CPA
MAX3087CSA
MAX3087EPA
MAX3087ESA
MAX3088CPA
MAX3088CSA
MAX3088EPA
MAX3088ESA
MAX3089CPD
MAX3089CSD
MAX3089EPD
MAX3089ESD
MAX3081CPA
MAX3081CSA
MAX3081EPA
MAX3081ESA
MAX3082CPA
MAX3082CSA
MAX3082EPA
MAX3082ESA
MAX3083CPD
MAX3083CSD
MAX3083EPD
MAX3083ESD
MAX3084CPA
MAX3084CSA
MAX3084EPA
MAX3084ESA
MAX3085CPA
MAX3085CSA
MAX3085EPA
MAX3085ESA
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
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
14 Plastic DIP
14 SO
8 Plastic DIP
8 SO
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
8 Plastic DIP
8 SO
14 Plastic DIP
14 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 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 ____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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