MAX3074EAPA+ [MAXIM]
Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDIP8, 0.300 INCH, PLASTIC, MS-001AB, DIP-8;
| 型号： | MAX3074EAPA+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Line Transceiver, 1 Func, 1 Driver, 1 Rcvr, BICMOS, PDIP8, 0.300 INCH, PLASTIC, MS-001AB, DIP-8 驱动 信息通信管理 光电二极管 接口集成电路 驱动器 |
| 文件： | 总23页 (文件大小：2331K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
General Description
Benefits and Features
The MAX3070E–MAX3079E 3.3V, ±15kV ESD-protected,
RS-485/RS-422 transceivers feature one driver and one
receiver. These devices include fail-safe circuitry, guaranteeing
a logic-high receiver output when receiver inputs are open
or shorted. The receiver outputs a logic-high if all transmitters
on a terminated bus are disabled (high impedance). The
devices include a hot-swap capability to eliminate false
transitions on the bus during power-up or hot insertion.
● Protection for Robust Performance
• ±15kV Human Body Model ESD on I/O Pins
• True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
• Enhanced Slew-Rate-Limiting Facilitates Error-
Free Data Transmission (MAX3070E-MAX3075E/
MAX3079E)
• Hot-Swap Input Structure on DE and RE
● Flexible Feature Set for Ease of Design
• Pin-Selectable Full/Half-Duplex Operation
(MAX3079E)
The MAX3070E/MAX3071E/MAX3072E feature reduced
slew-rate drivers that minimize EMI and reduce reflections
caused by improperly terminated cables, allowing error-
free data transmission up to 250kbps. The MAX3073E/
MAX3074E/MAX3075E also feature slew-rate-limited
drivers but allow transmit speeds up to 500kbps. The
MAX3076E/MAX3077E/MAX3078E driver slew rates are
not limited, making transmit speeds up to 16Mbps possible.
The MAX3079E slew rate is pin-selectable for 250kbps,
500kbps, and 16Mbps.
• Phase Controls to Correct for Twisted-Pair
Reversal (MAX3079E)
• Allows up to 256 Transceivers on the Bus
• Available in Industry-Standard SO and DIP packages
● 10µA Shutdown Current Mode for Power Savings
(Except MAX3071E/MAX3074E/MAX3077E)
Ordering Information at end of data sheet.
The MAX3072E/MAX3075E/MAX3078E are intended
for half-duplex communications, and the MAX3070E/
MAX3071E/MAX3073E/MAX3074E/MAX3076E/
MAX3077E are intended for full-duplex communications.
The MAX3079E is selectable for half-duplex or full-duplex
operation. It also features independently programmable
receiver and transmitter output phase through separate
pins.
Selector Guide, Pin Configurations, and Typical Operating
Circuits appear at end of data sheet.
The MAX3070E–MAX3079E transceivers draw 800μA
of supply current when unloaded, or when fully loaded
with the drivers disabled. All devices have a 1/8-unit load
receiver input impedance, allowing up to 256 transceivers
on the bus.
Applications
● Lighting Systems
● Industrial Control
● Telecom
● Security Systems
● Instrumentation
19-2668; Rev 4; 1/16
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Absolute Maximum Ratings
(All voltages referenced to GND)
Continuous Power Dissipation (T = +70°C)
A
Supply Voltage (V )............................................................+6V
Control Input Voltage (RE, DE, SLR,
H/F, TXP, RXP)....................................................-0.3V to +6V
Driver Input Voltage (DI)..........................................-0.3V to +6V
Driver Output Voltage (Z, Y, A, B) ............................-8V to +13V
Receiver Input Voltage (A, B)...................................-8V to +13V
Receiver Input Voltage
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ..727mW
14-Pin SO (derate 8.33mW/°C above +70°C).............667mW
14-Pin Plastic DIP (derate 10.0mW/°C above +70°C).. 800mW
Operating Temperature Ranges
MAX307_EE_ _.............................................. -40°C to +85°C
MAX307_EA_ _............................................ -40°C to +125°C
MAX3077EMSA............................................ -55°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
Full Duplex (A, B) .................................................-8V to +13V
Receiver Output Voltage (RO) ................. -0.3V to (V
+ 0.3V)
CC
Driver Output Current.....................................................±250mA
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
= 3.3V ±10%, T =T
to T
, unless otherwise noted. Typical values are at V
= 3.3V and T = +25°C.) (Note 1)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DRIVER
R = 100Ω (RS422), Figure 1
2
V
V
V
L
CC
CC
CC
Differential Driver Output
Change in Magnitude of
V
R = 54Ω (RS485), Figure 1
1.5
V
OD
L
No load
ΔV
R = 100Ω or 54Ω, Figure 1 (Note 2)
0.2
3
V
V
V
OD
L
Differential Output Voltage
Driver Common-Mode Output
Voltage
V
R = 100Ω or 54Ω, Figure 1
V
/2
OC
L
CC
Change in Magnitude of
Common-Mode Voltage
ΔV
R = 100Ω or 54Ω, Figure 1 (Note 2)
0.2
OC
L
Input High Voltage
Input Low Voltage
Input Hysteresis
Input Current
V
DE, DI, RE, TXP, RXP, H/F
DE, DI, RE, TXP, RXP, H/F
DE, DI, RE, TXP, RXP, H/F
DE, DI, RE
2
V
V
IH
V
0.8
IL
V
I
100
mV
µA
kΩ
µA
V
HYS
±1
10
40
IN1
Input Impedance First Transition
Input Current
DE
1
I
TXP, RXP, H/F internal pulldown
10
IN2
SRL Input High Voltage
SRL Input Middle Voltage
SRL Input Low Voltage
V
V
- 0.4
CC
x 0.4
V
x 0.6
0.4
V
CC
CC
V
SRL = V
75
CC
SRL Input Current
µA
µA
SRL = GND
DE = GND,
-75
-100
V
V
= +12V
= -7V
125
Output Leakage (Y and Z)
Full Duplex
IN
I
O
V
= GND or 3.6V
CC
IN
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
DC Electrical Characteristics (continued)
(V
= 3.3V ±10%, T =T
to T
, unless otherwise noted. Typical values are at V
= 3.3V and T = +25°C.) (Note 1)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
≤ 12V (Note 3)
MIN
40
TYP
MAX
250
-40
UNITS
0 ≤ V
OUT
Driver Short-Circuit Output Current
I
mA
OSD
-7V ≤ V
≤ V
(Note 3)
-250
20
OUT
CC
(V
- 1V) ≤ V
≤ 12V (Note 3)
Driver Short-Circuit Foldback
Output Current
CC
OUT
I
mA
OSDF
-7V ≤ V
≤ 1V (Note 3)
-20
OUT
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
T
175
15
°C
°C
TS
T
TSH
V
V
= +12V
= -7V
125
DE = GND,
= GND or 3.6V
IN
Input Current (A and B)
I
µA
A, B
V
-100
-200
CC
IN
RECEIVER
Receiver Differential Threshold
Voltage
V
-7V ≤ V
≤ 12V
-125
15
-50
mV
TH
CM
Receiver Input Hysteresis
RO Output High Voltage
RO Output Low Voltage
ΔV
V
+ V = 0V
mV
V
TH
A B
V
I
I
= -1mA
= 1mA
O
V
- 0.6
OH
O
CC
V
0.4
±1
V
OL
Three-State Output Current at
Receiver
I
0 ≤ V ≤ V
µA
kΩ
mA
OZR
O
CC
Receiver Input Resistance
R
-7V ≤ V
≤ 12V
96
IN
CM
Receiver Output Short-Circuit
Current
I
0V ≤ V
≤ V
CC
±80
OSR
RO
SUPPLY CURRENT
No load, RE = 0, DE = V
0.8
0.8
0.8
1.5
1.5
1.5
CC
Supply Current
I
No load, RE = V , DE = V
CC
mA
µA
kV
CC
CC
No load, RE = 0, DE = 0
Supply Current in Shutdown Mode
I
RE = V , DE = GND
0.05
10
SHDN
CC
ESD PROTECTION
ESD Protection for Y, Z, A, and B
Human Body Model
±15
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: ΔV
and ΔV
are the changes in V
and V , respectively, when the DI input changes state.
OD
OC
OD OC
Note 3: The short-circuit output current applies to peak current just prior to foldback current limiting. The short-circuit foldback output
current applies during current limiting to allow a recovery from bus contention.
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Switching Characteristics
Driver Switching Characteristics
MAX3070E/MAX3071E/MAX3072E/MAX3079E with SRL = UNCONNECTED (250kbps)
(V
= 3.3V ±10%, T = T
to T
, unless otherwise noted. Typical values are at V
= 3.3V and T = +25°C.)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
C = 50pF, R = 54Ω, Figures 2 and 3
MIN
250
250
TYP
MAX
1500
1500
UNITS
t
DPLH
Driver Propagation Delay
ns
L
L
t
DPHL
Driver Differential Output Rise or
Fall Time
t
, t
C = 50pF, R = 54Ω, Figures 2 and 3
350
1600
200
ns
ns
DR DF
L
L
Differential Driver Output Skew
t
C = 50pF, R = 54Ω, Figures 2 and 3
DSKEW
L
L
|t
- t
|
DPLH DPHL
Maximum Data Rate
250
kbps
ns
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
t
Figure 4
Figure 5
Figure 5
Figure 4
2500
2500
100
DZH
t
ns
DZL
DLZ
DHZ
t
ns
t
100
ns
Driver Enable from Shutdown to
Output High
t
Figure 4
Figure 5
5500
ns
DZH(SHDN)
Driver Enable from Shutdown to
Output Low
t
5500
600
ns
ns
DZL(SHDN)
Time to Shutdown
t
50
200
SHDN
Receiver Switching Characteristics
MAX3070E/MAX3071E/MAX3072E/MAX3079E with SRL = UNCONNECTED (250kbps)
(V
= 3.3V ±10%, T = T
to T
, unless otherwise noted. Typical values are at V
= 3.3V and T = +25°C.)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
C = 15pF, Figures 6 and 7
MIN
TYP
MAX
200
UNITS
t
RPLH
Receiver Propagation Delay
ns
L
t
200
RPHL
Receiver Output Skew
t
C = 15pF, Figures 6 and 7
L
30
ns
RSKEW
|t
- t
|
RPLH RPHL
Maximum Data Rate
250
kbps
ns
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable Time from Low
Receiver Disable Time from High
t
Figure 8
Figure 8
Figure 8
Figure 8
50
50
50
50
RZL
t
ns
RZH
t
ns
RLZ
RHZ
t
ns
Receiver Enable from Shutdown
to Output High
t
Figure 8
Figure 8
4000
ns
RZH(SHDN)
Receiver Enable from Shutdown
to Output Low
t
4000
600
ns
ns
RZL(SHDN)
Time to Shutdown
t
50
200
SHDN
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Driver Switching Characteristics
MAX3073E/MAX3074E/MAX3075E/MAX3079E with SRL = V
(500kbps)
CC
(V
= 3.3V ±10%, T = T
to T
, unless otherwise noted. Typical values are at V
= 3.3V and T = +25°C.)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
C = 50pF, R = 54Ω, Figures 2 and 3
MIN
180
180
TYP
MAX
800
UNITS
t
DPLH
Driver Propagation Delay
ns
L
L
t
800
DPHL
Driver Differential Output Rise or
Fall Time
t
, t
C = 50pF, R = 54Ω, Figures 2 and 3
200
800
100
ns
ns
DR DF
L
L
Differential Driver Output Skew
t
C = 50pF, R = 54Ω, Figures 2 and 3
DSKEW
L
L
|t
- t
|
DPLH DPHL
Maximum Data Rate
500
kbps
ns
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
t
Figure 4
Figure 5
Figure 5
Figure 4
2500
2500
100
DZH
t
ns
DZL
DLZ
DHZ
t
ns
t
100
ns
Driver Enable from Shutdown to
Output High
t
Figure 4
Figure 5
4500
ns
DZH(SHDN)
Driver Enable from Shutdown to
Output Low
t
4500
600
ns
ns
DZL(SHDN)
Time to Shutdown
t
50
200
SHDN
Receiver Switching Characteristics
MAX3073E/MAX3074E/MAX3075E/MAX3079E with SRL = V
(500kbps)
CC
(V
= 3.3V ±10%, T = T
to T
, unless otherwise noted. Typical values are at V
= 3.3V and T = +25°C.)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
C = 15pF, Figures 6 and 7
MIN
TYP
MAX
200
UNITS
t
RPLH
Receiver Propagation Delay
ns
L
t
200
RPHL
Receiver Output Skew
t
C = 15pF, Figures 6 and 7
L
30
ns
RSKEW
|t
- t
|
RPLH RPHL
Maximum Data Rate
500
kbps
ns
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable Time from Low
Receiver Disable Time from High
t
Figure 8
Figure 8
Figure 8
Figure 8
50
50
50
50
RZL
t
ns
RZH
t
ns
RLZ
RHZ
t
ns
Receiver Enable from Shutdown
to Output High
t
Figure 8
Figure 8
4000
ns
RZH(SHDN)
Receiver Enable from Shutdown
to Output Low
t
4000
600
ns
ns
RZL(SHDN)
Time to Shutdown
t
50
200
SHDN
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Driver Switching Characteristics
MAX3076E/MAX3077E/MAX3078E/MAX3079E with SRL = GND (16Mbps)
(V
= 3.3V ±10%, T = T
to T
, unless otherwise noted. Typical values are at V
= 3.3V and T = +25°C.)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
C = 50pF, R = 54Ω, Figures 2 and 3
MIN
TYP
MAX
50
UNITS
t
DPLH
Driver Propagation Delay
ns
L
L
t
50
DPHL
Driver Differential Output Rise or
Fall Time
t
, t
C = 50pF, R = 54Ω, Figures 2 and 3
15
8
ns
ns
DR DF
L
L
Differential Driver Output Skew
t
C = 50pF, R = 54Ω, Figures 2 and 3
DSKEW
L
L
|t
- t
|
DPLH DPHL
Maximum Data Rate
16
Mbps
ns
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
t
Figure 4
Figure 5
Figure 5
Figure 4
150
150
100
100
DZH
t
ns
DZL
DLZ
DHZ
t
ns
t
ns
Driver Enable from Shutdown to
Output High
t
Figure 4
Figure 5
1250
1800
ns
DZH(SHDN)
Driver Enable from Shutdown to
Output Low
t
1250
200
1800
600
ns
ns
DZL(SHDN)
Time to Shutdown
t
50
SHDN
Receiver Switching Characteristics
MAX3076E/MAX3077E/MAX3078E/MAX3079E with SRL = GND (16Mbps)
(V
= 3.3V ±10%, T = T
to T
, unless otherwise noted. Typical values are at V
= 3.3V and T = +25°C.)
CC
A
MIN
MAX
CC A
PARAMETER
SYMBOL
CONDITIONS
C = 15pF, Figures 6 and 7
MIN
TYP
40
MAX
75
UNITS
t
RPLH
Receiver Propagation Delay
ns
L
t
40
75
RPHL
Receiver Output Skew
t
C = 15pF, Figures 6 and 7
L
8
ns
RSKEW
|t
- t
|
RPLH RPHL
Maximum Data Rate
16
Mbps
ns
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable Time from Low
Receiver Disable Time from High
t
Figure 8
Figure 8
Figure 8
Figure 8
50
50
50
50
RZL
t
ns
RZH
t
ns
RLZ
RHZ
t
ns
Receiver Enable from Shutdown
to Output High
t
Figure 8
Figure 8
1800
ns
RZH(SHDN)
Receiver Enable from Shutdown
to Output Low
t
1800
600
ns
ns
RZL(SHDN)
Time to Shutdown
t
50
200
SHDN
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Typical Operating Characteristics
(V
= 3.3V, T = +25°C, unless otherwise noted. Note: The MAX3077EMSA/PR meets specification over temperature.)
CC
A
OUTPUT CURRENT
vs. RECEIVER OUTPUT HIGH VOLTAGE
OUTPUT CURRENT
vs. RECEIVER OUTPUT LOW VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
1.0
30
25
20
15
10
5
35
30
25
20
15
10
5
0.9
0.8
0.7
0.6
0.5
DE = V
CC
DE = 0
0
0
-50 -25
0
25
50
75 100 125
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT HIGH VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
OUTPUT HIGH VOLTAGE (V)
TEMPERATURE (°C)
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
100
90
80
70
60
50
40
30
20
10
0
3.30
3.25
3.20
3.15
3.10
3.05
3.00
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
I
= -1mA
O
I
= -1mA
O
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5
DIFFERENTIAL OUTPUT VOLTAGE (V)
-50 -25
0
25
50
75 100 125
-50 -25
0
25
50
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
OUTPUT CURRENT
vs. TRANSMITTER OUTPUT HIGH VOLTAGE
OUTPUT CURRENT
vs. TRANSMITTER OUTPUT LOW VOLTAGE
160
180
2.60
R = 54Ω
L
2.50
2.40
2.30
2.20
2.10
2.00
1.90
1.80
1.70
1.60
160
140
120
100
80
140
120
100
80
60
60
40
40
20
20
0
0
-7 -6 -5 -4 -3 -2 -1
0
1
2
3
4
0
2
4
6
8
10
12
-50 -25
0
25
50
75 100 125
OUTPUT HIGH VOLTAGE (V)
OUTPUT LOW VOLTAGE (V)
TEMPERATURE (°C)
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Typical Operating Characteristics (continued)
(V
= 3.3V, T = +25°C, unless otherwise noted. Note: The MAX3077EMSA/PR meets specification over temperature.)
A
CC
SHUTDOWN CURRENT
vs. TEMPERATURE
DRIVER PROPAGATION DELAY
vs. TEMPERATURE (250kbps)
DRIVER PROPAGATION DELAY
vs. TEMPERATURE (500kbps)
2.0
1000
900
800
700
600
500
500
450
400
350
300
250
200
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
t
DPLH
t
DPLH
t
t
DPHL
DPHL
-50 -25
0
25
50
75 100 125
-50 -25
0
25
50
75 100 125
-50 -25
0
25
50
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
DRIVER PROPAGATION DELAY
vs. TEMPERATURE (16Mbps)
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE (250kbps AND 500kbps)
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE (16Mbps)
30
25
20
15
10
5
150
120
90
60
30
0
70
60
50
40
30
20
10
0
t
DPLH
t
DPLH
t
DPLH
t
DPHL
t
DPHL
t
DPHL
0
-50 -25
0
25
50
75 100 125
-50 -25
0
25
50
75 100 125
-50 -25
0
25
50
75 100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY
(250kbps AND 500kbps)
DRIVER PROPAGATION DELAY (250kbps)
MAX3070E toc16
MAX3070E toc17
V
- V
B
A
DI
2V/div
1V/div
V
Y
- V
Z
RO
2V/div
2V/div
1µs/div
200ns/div
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Typical Operating Characteristics (continued)
(V
= 3.3V, T = +25°C, unless otherwise noted. Note: The MAX3077EMSA/PR meets specification over temperature.)
A
CC
DRIVER PROPAGATION DELAY (500kbps)
DRIVER PROPAGATION DELAY (16Mbps)
RECEIVER PROPAGATION DELAY (16Mbps)
MAX3070E toc18
MAX3070E toc19
MAX3070E toc20
V
A
1V/div
DI
2V/div
DI
2V/div
V
B
1V/div
V
Z
1V/div
V
Y
- V
Z
2V/div
RO
2V/div
V
Y
1V/div
400ns/div
10ns/div
20ns/div
Test Circuits and Waveforms
3V
DE
Y
R /2
L
Y
Z
V
OD
DI
R
L
C
L
V
OD
V
OC
R /2
L
Z
Figure 1. Driver DC Test Load
Figure 2. Driver Timing Test Circuit
V
CC
0
DI
V /2
CC
t
t
DPHL
1/2 V
DPLH
O
Z
Y
V
O
1/2 V
O
V
DIFF
= V (Y) - V (Z)
V
O
O
90%
90%
V
DIFF 0
-V
10%
10%
t
t
DF
DR
t
= | t
- t
|
SKEW
DPLH DPHL
Figure 3. Driver Propagation Delays
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Test Circuits and Waveforms (continued)
S1
0 OR 3V
D
OUT
R = 500Ω
L
C
L
50pF
GENERATOR
50Ω
V
0
CC
DE
V
CC
/ 2
t
, t
DZH DZH(SHDN)
0.25V
V
OH
OUT
V
OM
= (0 + V ) / 2
OH
0
t
DHZ
Figure 4. Driver Enable and Disable Times (t
, t
, t
)
DHZ DZH DZH(SHDN)
V
CC
R = 500Ω
L
S1
0 OR 3V
D
OUT
C
L
50pF
GENERATOR
50Ω
V
CC
DE
V
CC
/ 2
t
, t
DZL DZL(SHDN)
0
t
DLZ
V
CC
V
OM
= (V + V ) / 2
OL CC
OUT
0.25V
V
OL
Figure 5. Driver Enable and Disable Times (t
, t
, t
)
DHZ DZH DZH(SHDN)
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Test Circuits and Waveforms (continued)
A
B
+1V
-1V
RECEIVER
OUTPUT
B
A
t
V
ID
R
RPLH
ATE
V
OH
t
RPHL
1.5V
V
OL
RO
THE RISE TIME AND FALL TIME OF INPUTS A AND B < 4ns
Figure 6. Receiver Propagation Delay Test Circuit
Figure 7. Receiver Propagation Delays
S1
+1.5V
-1.5V
S3
V
CC
1kΩ
V
ID
C
L
15pF
S2
GENERATOR
50Ω
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
3V
3V
0
1.5V
RE
RE
0
t
, t
RZH RZH(SHDN)
t
, t
RZL RZL(SHDN)
V
OH
V
CC
RO
V
OH
/ 2
(V + V ) / 2
OL
CC
RO
V
OL
0
S1 OPEN
S2 CLOSED
S3 = +1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
3V
3V
0
1.5V
1.5V
RE
RE
0
t
RHZ
t
RLZ
V
CC
OL
V
0
OH
0.25V
RO
RO
0.25V
V
Figure 8. Receiver Enable and Disable Times
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Pin Description
PIN
MAX3070E MAX3071E MAX3072E
MAX3073E MAX3074E MAX3075E
MAX3076E MAX3077E MAX3078E
MAX3079E
NAME
FUNCTION
HALF-
FULL-
HALF-
FULL-DUPLEX
DUPLEX DUPLEX DUPLEX
DEVICES
DEVICES
MODE
MODE
Half-/Full-Duplex Select Pin. Connect H/F to V
duplex mode; connect to GND or leave unconnected for
full-duplex mode.
for half-
CC
—
—
2
—
1
1
H/F
Receiver Output. When RE is low and if (A - B) ≥ -50mV,
RO is high; if (A - B) ≤ -200mV, RO is 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. RE is a hot-swap
input (see the Hot-Swap Capability section for details).
—
—
RE
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. DE is a hot-swap input (see the Hot-
Swap Capability section for details).
4
3
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 noninverting output high and inverting output low.
5
3
4
5
6
5
6
DI
Slew-Rate Limit Selector Pin. Connect SRL to ground for
16Mbps communication rate; connect to V
for 500kbps
CC
—
—
—
SRL
communication rate. Leave unconnected for 250kbps
communication rate.
6, 7
—
4
5
7
8
7
8
GND Ground
Transmitter Phase. Connect TXP to ground or leave
TXP unconnected for normal transmitter phase/polarity.
Connect to V to invert the transmitter phase/polarity.
—
—
CC
9
5
—
—
9
—
9
Y
Y
Noninverting Driver Output
Noninverting Driver Output and Noninverting Receiver
Input*
—
—
—
10
—
11
—
—
6
—
—
—
—
7
10
—
11
—
—
—
10
—
11
—
Z
Z
B
B
B
Inverting Driver Output
—
7
Inverting Driver Output and Inverting Receiver Input*
Inverting Receiver Input
—
—
Receiver Input Resistors*
Inverting Receiver Input and Inverting Driver Output
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Pin Description (continued)
PIN
MAX3070E MAX3071E MAX3072E
MAX3073E MAX3074E MAX3075E
MAX3076E MAX3077E MAX3078E
MAX3079E
NAME
FUNCTION
HALF-
FULL-
HALF-
FULL-DUPLEX
DUPLEX DUPLEX DUPLEX
DEVICES
DEVICES
MODE
MODE
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
—
—
13
13
RXP unconnected for normal transmitter phase/polarity.
Connect to V to invert receiver phase/polarity.
CC
Positive Supply V
= 3.3V ±10%. Bypass V
to GND
CC
CC
14
1
8
14
—
14
—
V
CC
with a 0.1µF capacitor.
No Connect. Not internally connected. Can be connected
to GND.
1, 8, 13
—
—
N.C.
*MAX3079E only. In half-duplex mode, the driver outputs serve as receiver inputs. The full-duplex receiver inputs (A and B) still have
a 1/8-unit load, but are not connected to the receiver.
Function Tables
MAX3070E/MAX3073E/MAX3076E
MAX3071E/MAX3074E/MAX3077E
TRANSMITTING
INPUTS
TRANSMITTING
OUTPUTS
INPUT
OUTPUTS
RE
X
DE
1
DI
Z
0
1
Y
DI
1
Z
0
1
Y
1
0
1
1
0
X
1
0
0
0
0
X
X
High-Z
High-Z
RECEIVING
1
0
Shutdown
INPUTS
A, B
OUTPUT
RECEIVING
RO
1
INPUTS
OUTPUT
≥ -50mV
RE
0
DE
X
A, B
RO
1
≤ -200mV
Open/shorted
0
≥ -50mV
≤ -200mV
1
0
X
0
Open/
shorted
0
X
1
1
1
1
0
X
X
High-Z
Shutdown
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Function Tables (continued)
MAX3072E/MAX3075E/MAX3078E
TRANSMITTING
INPUTS
RECEIVING
OUTPUTS
INPUTS
OUTPUTS
RE
X
DE
1
DI
1
B/Z
A/Y
RE
0
DE
X
A-B
RO
1
0
1
1
0
≥ -50mV
≤ -200mV
X
1
0
0
X
0
0
0
X
X
High-Z
High-Z
Open/
shorted
0
X
1
1
0
Shutdown
1
1
1
0
X
X
High-Z
Shutdown
MAX3079E
TRANSMITTING
INPUTS
OUTPUTS
TXP
0
RE
DE
1
DI
Z
Y
X
X
X
X
0
1
0
1
0
X
X
0
1
0
1
1
0
1
1
1
0
0
1
1
1
X
0
High-Z
High-Z
X
1
0
Shutdown
RECEIVING
INPUTS
OUTPUTS
H/F
0
RXP
0
RE
0
0
0
0
0
0
0
0
0
0
0
0
1
1
DE
X
X
X
X
0
A, B
> -50mV
Y, Z
RO
X
1
0
0
< -200mV
X
0
0
1
> -50mV
X
X
0
0
1
< -200mV
1
1
0
X
> -50mV
1
1
0
0
X
< -200mV
0
1
1
0
X
> -50mV
0
1
1
0
X
< -200mV
1
0
0
X
0
Open/shorted
X
1
1
0
X
Open/shorted
1
0
1
X
0
Open/shorted
X
0
0
1
1
X
X
X
Open/shorted
X
X
X
X
1
X
X
High-Z
Shutdown
0
X = Don’t care; shutdown mode, driver and receiver outputs are high impedance.
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
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 MAX3070E 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.
Detailed Description
The MAX3070E–MAX3079E 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 the Fail-Safe section). The
devices also feature a hot-swap capability allowing line
insertion without erroneous data transfer (see the Hot-
Swap Capability section). The MAX3070E/MAX3071E/
MAX3072E feature reduced slew-rate drivers that
minimize EMI and reduce reflections caused by improperly
terminated cables, allowing error-free data transmission
up to 250kbps. The MAX3073E/MAX3074E/MAX3075E
also offer slew-rate limits allowing transmit speeds up
to 500kbps. The MAX3076E/MAX3077E/MAX3078Es’
driver slew rates are not limited, making transmit speeds
up to 16Mbps possible. The MAX3079E’s slew rate is
selectable between 250kbps, 500kbps, and 16Mbps by
driving a selector pin with a three-state driver.
Hot-Swap Capability
(Except MAX3071E/MAX3074E/MAX3077E)
Hot-Swap Inputs
When circuit boards are inserted into a hot, or powered,
backplane, differential disturbances to the data bus can
lead to data errors. Upon initial circuit board insertion,
the data communication processor undergoes its own
power-up sequence. During this period, the processor’s
logic-output drivers are high impedance and are unable to
drive the DE and RE inputs of these devices to a defined
logic level. Leakage currents up to ±10μA from the high-
impedance state of the processor’s logic drivers could
cause standard CMOS enable inputs of a transceiver to
drift to an incorrect logic level. Additionally, parasitic circuit
board capacitance could cause coupling of V
or GND
CC
The MAX3072E/MAX3075E/MAX3078E are half-duplex
transceivers, while the MAX3070E/MAX3071E/MAX3073E/
MAX3074E/MAX3076E/MAX3077E are full-duplex transceivers.
The MAX3079E is selectable between half and full-duplex
communication by driving a selector pin (SRL) high or low,
respectively.
to the enable inputs. Without the hot-swap capability,
these factors could improperly enable the transceiver’s
driver or receiver.
When V
rises, an internal pulldown circuit holds DE
CC
low and RE high. After the initial power-up sequence, the
pulldown circuit becomes transparent, resetting the hot-
swap tolerable input.
All devices operate from a single 3.3V 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 high-impedance state.
Hot-Swap Input Circuitry
The enable inputs feature hot-swap capability. At the input
there are two NMOS devices, M1 and M2 (Figure 9).
When V
ramps from zero, an internal 10μs timer turns
CC
Receiver Input Filtering
on M2 and sets the SR latch, which also turns on M1.
Transistors M2, a 500μA current sink, and M1, a 100μA
current sink, pull DE to GND through a 5kΩ resistor. M2 is
designed to pull DE to the disabled state against an external
parasitic capacitance up to 100pF that can drive DE high.
After 10μs, the timer deactivates M2 while M1 remains on,
holding DE low against three-state leakages that can drive
DE high. M1 remains on until an external source overcomes
the required input current. At this time, the SR latch resets
and M1 turns off. When M1 turns off, DE reverts to a standard,
The receivers of the MAX3070E–MAX3075E, and the
MAX3079E when operating in 250kbps 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 25% due to this filtering.
Fail-Safe
The MAX3070E 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 input 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
high-impedance CMOS input. Whenever V
below 1V, the hot-swap input is reset.
drops
CC
For RE there is a complementary circuit employing two
PMOS devices pulling RE to V
.
CC
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
pulldown), or connect it to GND for full-duplex operation.
Drive H/F high for half-duplex operation. In full-duplex
mode, the pin configuration of the driver and receiver is
the same as that of a MAX3070E. In half-duplex mode,
the receiver inputs are switched to the driver outputs, con-
necting 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.
V
CC
10ms
TIMER
SR LATCH
TIMER
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
discharges encountered during handling and assembly.
The driver outputs and receiver inputs of the MAX3070E
family of devices have extra protection against static
electricity. Maxim’s engineers have developed state-of-
the-art structures to protect these pins against ESD of
±15kV without damage. The ESD structures withstand
high ESD in all states: normal operation, shutdown, and
powered down. After an ESD event, the devices keep
working without latchup or damage.
5kΩ
DE
DE
(HOT SWAP)
100mA
500mA
M1
M2
ESD protection can be tested in various ways. The transmitter
outputs and receiver inputs of the devices are characterized
for protection to the following limits:
Figure 9. Simplified Structure of the Driver Enable Pin (DE)
● ±15kV using the Human Body Model
● ±6kV using the Contact Discharge method specified
MAX3079E Programming
in IEC 1000-4-2
The MAX3079E has several programmable operating
modes. Transmitter rise and fall times are programmable,
resulting in maximum data rates of 250kbps, 500kbps,
and 16Mbps. To select the desired data rate, drive SRL to
one of three possible states by using a three-state driver:
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.
V
, GND, or unconnected. For 250kbps operation, set
CC
Human Body Model
the three-state device in high-impedance mode or leave
SRL unconnected. For 500kbps operation, drive SRL high
or connect it to V . For 16Mbps operation, drive SRL
low or connect it to GND. SRL can be changed during
operation without interrupting data communications.
Figure 10a shows the Human Body Model, and Figure 10b
shows the current waveform it generates when discharged
into a low impedance. This model consists of a 100pF
capacitor charged to the ESD voltage of interest, which
is then discharged into the test device through a 1.5kΩ
resistor.
CC
Occasionally, twisted-pair lines are connected backward
from normal orientation. The MAX3079E has two pins that
invert the phase of the driver and the receiver to correct
this problem. For normal operation, drive TXP and RXP
low, connect them to ground, or leave them unconnected
(internal pulldown). To invert the driver phase, drive TXP
high or connect it to V . To invert the receiver phase,
drive RXP high or connect it to V . Note that the receiver
threshold is positive when RXP is high.
IEC 1000-4-2
The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment. However, it does not
specifically refer to integrated circuits. The MAX3070E
family of devices helps you design equipment to meet IEC
1000-4-2, without the need for additional ESD-protection
components.
CC
CC
The major difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak
current in IEC 1000-4-2, because series resistance is
The MAX3079E can operate in full/half-duplex mode.
Drive the H/F pin low, leave it unconnected (internal
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
R
C
R
D
1MΩ
1500Ω
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
100%
90%
I
P
r
DISCHARGE
RESISTANCE
CHARGE-CURRENT-
LIMIT RESISTOR
AMPS
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
36.8%
C
100pF
STORAGE
CAPACITOR
s
10%
0
SOURCE
TIME
0
t
RL
t
DL
CURRENT WAVEFORM
Figure 10a. Human Body ESD Test Model
Figure 10b. Human Body Current Waveform
R
C
I
R
D
50MΩ TO 100MΩ
330Ω
100%
90%
DISCHARGE
RESISTANCE
CHARGE-CURRENT-
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
150pF
STORAGE
CAPACITOR
s
SOURCE
10%
t = 0.7ns TO 1ns
r
t
30ns
60ns
Figure 10c. IEC 1000-4-2 ESD Test Model
Figure 10d. IEC 1000-4-2 ESD Generator Current Waveform
lower in the IEC 1000-4-2 model. Hence, the ESD withstand
voltage measured to IEC 1000-4-2 is generally lower than
that measured using the Human Body Model. Figure 10c
shows the IEC 1000-4-2 model, and Figure 10d shows
the current waveform for IEC 1000-4-2 ESD Contact
Discharge test.
Applications Information
256 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12kΩ
(1-unit load), and the standard driver can drive up to
32-unit loads. The MAX3070E family of transceivers has
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 as
well as other RS-485 transceivers with a total of 32-unit
loads or fewer can be connected to the line.
The air-gap test involves approaching the device with a
charged probe. The contact-discharge method connects
the probe to the device before the probe is energized.
Machine Model
The machine model for ESD tests all pins using a 200pF
storage capacitor and zero discharge resistance. The
objective is to emulate the stress caused when I/O pins
are contacted by handling equipment during test and
assembly. Of course, all pins require this protection, not
just RS-485 inputs and outputs.
Reduced EMI and Reflections
The MAX3070E/MAX3071E/MAX3072E feature reduced
slew-rate drivers that minimize EMI and reduce reflections
caused by improperly terminated cables, allowing error-
free data transmission up to 250kbps. The MAX3073E/
MAX3074E/MAX3075E offer higher driver output slew-
rate limits, allowing transmit speeds up to 500kbps.
The MAX3079E with SRL = V
or unconnected, are
CC
slew-rate limited. With SRL unconnected, the MAX3079E
error-free data transmission is up to 250kbps; with SRL
connected to V
the data transmit speeds up to 500kbps.
CC
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Low-Power Shutdown Mode
Driver Output Protection
(Except MAX3071E/MAX3074E/MAX3077E)
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 the Typical
Operating Characteristics). The second, a thermal-shutdown
circuit, forces the driver outputs into a high-impedance
state if the die temperature becomes excessive.
Low-power shutdown mode is initiated by bringing both
RE high and DE low. In shutdown, the devices typically
draw only 50nA of supply current.
RE and DE can 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.
Enabletimest andt (seetheSwitchingCharacteristics
section) assume the part was not in a low-power shutdown
Line Length
ZH
ZL
The RS-485/RS-422 standard covers line lengths up
to 4000ft. For line lengths greater than 4000ft, use the
repeater application shown in Figure 11.
state. Enable times t and t assume the
ZH(SHDN)
ZL(SHDN)
parts were shut down. It takes drivers and receivers longer
to become enabled from low-power shutdown mode
Typical Applications
(t
, t
) than from driver/receiver-disable
ZH(SHDN) ZL(SHDN)
mode (t , t ).
The MAX3072E/MAX3075E/MAX3078E/MAX3079E
transceivers are designed for bidirectional data
communications on multipoint bus transmission lines.
Figure 12 and Figure 13 show typical network application
circuits.
ZH ZL
MAX3070E/MAX3071E/MAX3073E/
MAX3074E/MAX3076E/MAX3077E/
MAX3079E (FULL-DUPLEX)
To minimize reflections, terminate the line at both ends
in its characteristic impedance, and keep stub lengths
off the main line as short as possible. The slew-rate-
limited MAX3072E/MAX3075E and the two modes of the
MAX3079E are more tolerant of imperfect termination.
A
RO
RE
DATA IN
R
B
120Ω
DE
Z
DI
D
DATA OUT
Y 120Ω
Chip Information
PROCESS: BiCMOS
Figure 11. Line Repeater for MAX3070E/MAX3071E/
MAX3073E/ MAX3074E/MAX3076E/MAX3077E/MAX3079E in
Full-Duplex Mode
120Ω
120Ω
DE
B
B
DI
D
D
DI
DE
A
B
A
B
A
A
RO
RO
R
R
RE
RE
R
R
D
D
MAX3072E
MAX3075E
MAX3078E
DE
DI
DI
RO
DE RO
RE
RE
MAX3079E (HALF-DUPLEX)
Figure 12. Typical Half-Duplex RS-485 Network
Maxim Integrated
│ 18
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
A
Y
120Ω
120Ω
120Ω
R
RO
RE
DE
D
DI
B
Z
B
DE
RE
RO
Z
Y
120Ω
D
DI
R
A
Y
Z
B
A
Y
Z
B
A
R
R
MAX3070E
MAX3073E
MAX3076E
D
D
MAX3079E (FULL-DUPLEX)
DI
DI
DE
DE
RERO
RERO
Figure 13. Typical Full-Duplex RS-485 Network
Selector Guide
RECEIVER/
DRIVER
ENABLE
HALF/FULL-
DUPLEX
DATA RATE
(MBPS)
SLEW-RATE LOW-POWER
TRANSCEIVERS
PART
PINS
LIMITED
SHUTDOWN
ON BUS
MAX3070E
MAX3071E
MAX3072E
MAX3073E
MAX3074E
MAX3075E
MAX3076E
MAX3077E
MAX3078E
MAX3079E
Full
Full
0.250
0.250
0.250
0.5
Yes
Yes
Yes
No
Yes
No
256
256
256
256
256
256
256
256
256
256
14
8
Half
Yes
Yes
Yes
No
Yes
Yes
No
8
Full
Yes
14
8
Full
0.5
Yes
Half
0.5
Yes
Yes
Yes
No
Yes
Yes
No
8
Full
16
No
14
8
Full
16
No
Half
16
No
Yes
Yes
Yes
Yes
8
Selectable
Selectable
Selectable
14
Maxim Integrated
│ 19
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Pin Configurations and Typical Operating Circuits
V
CC
MAX3070E
MAX3073E
MAX3076E
DE
V
CC RE
0.1µF
14
4
N.C.
RO
V
CC
1
2
3
4
5
6
7
14
13
12
11
10
9
Y
9
5
Rt
D
RO
DI
DI
R
N.C.
A
R
10
12
Z
A
RE
DE
B
2
Rt
D
RO
R
11
DI
Z
B
D
1, 8, 13
Y
N.C.
GND
GND
GND
3
6, 7
N.C.
8
GND DE
RE
TYPICAL FULL-DUPLEX OPERATING CIRCUIT
DIP/SO
0.1µF
MAX3071E
MAX3074E
MAX3077E
V
CC
V
CC
1
V
A
B
Z
Y
CC
1
8
7
6
5
Y
5
6
8
R
3
2
Rt
RO
DI
2
3
4
D
RO
DI
R
Z
A
D
GND
Rt
DI
D
RO
R
7
B
DIP/SO
GND
4
GND
TYPICAL FULL-DUPLEX OPERATING CIRCUIT
MAX3072E
MAX3075E
MAX3078E
0.1µF
DE
1
8
7
DI
V
CC
RO
RE
DE
DI
RO
RE
DE
DI
V
1
2
3
4
8
7
6
5
R
R
D
CC
2
3
4
A
B
A
B
B
A
Rt
Rt
6
5
RO
D
D
R
GND
GND
RE
DIP/SO
TYPICAL HALF-DUPLEX OPERATING CIRCUIT
NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORMS DIAGRAMS.
REFER TO PINS A AND B WHEN DE IS HIGH.
Maxim Integrated
│ 20
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Pin Configurations and Typical Operating Circuits (continued)
V
CC
RE
MAX3079E
A
B
RO
TOP VIEW
H/F
RO
1
2
3
4
5
6
7
14
13
12
11
10
9
V
CC
RXP
RXP
A
RE
DE
MAX3079E
B
H/F
Z
Y
DI
Z
TXP
SRL
GND
Y
TXP
8
DIP/SO
DI
NOTE: SWITCH POSITIONS
INDICATED FOR H/F = GND.
GND DE SRL
Maxim Integrated
│ 21
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Ordering Information
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character,
but the drawing pertains to the package regardless of RoHS status.
PART†
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
-55°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
14 Plastic DIP
14 SO
MAX3070EEPD+
MAX3070EESD+
MAX3070EAPD+
MAX3070EASD+
MAX3071EEPA+
MAX3071EESA+
MAX3071EAPA+
MAX3071EASA+
MAX3072EEPA+
MAX3072EESA+
MAX3072EAPA+
MAX3072EASA+
MAX3073EEPD+
MAX3073EESD+
MAX3073EAPD+
MAX3073EASD+
MAX3074EEPA+
MAX3074EESA+
MAX3074EAPA+
MAX3074EASA+
MAX3075EEPA+
MAX3075EESA+
MAX3077EESA/V+
MAX3075EAPA+
MAX3075EASA+
MAX3076EEPD+
MAX3076EESD+
MAX3076EAPD+
MAX3076EASD+
MAX3077EEPA+
MAX3077EESA+
MAX3077EESA/V+
MAX3077EAPA+
MAX3077EASA+
MAX3077EMSA/PR+
MAX3078EEPA+
MAX3078EESA+
MAX3078EAPA+
MAX3078EASA+
MAX3079EEPD+
MAX3079EESD+
MAX3079EAPD+
MAX3079EASD+
14 Plastic DIP
14 SO
PACKAGE PACKAGE OUTLINE
8 Plastic DIP
8 SO
LAND PATTERN NO.
TYPE
8 Plastic
14 Plastic
8 SO
CODE
NO.
P8+2
8 Plastic DIP
8 SO
21-0043
—
P14+3
S8+4
90-0096
90-0112
8 Plastic DIP
8 SO
21-0041
14 SO
S14+1
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 SO
8 Plastic DIP
8 SO
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
8 Plastic DIP
8 SO
8 SO
8 Plastic DIP
8 SO
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
†Devices are available in both leaded (Pb) and lead(Pb)-free
packaging. Specify lead-free by adding a “+” after the part
number.
Maxim Integrated
│ 22
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MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
10/02
Initial release.
—
Added /PR information to reflect new characterization information for military
temperature version.
2, 3, 7, 8, 12, 13, 19,
22–25
2
4/09
Updated Benefits and Features section and added MAX3077EESA/V+ to Ordering
Information section for automotive customers
3
4
9/15
1/16
1, 22
Replaced leaded part numbers with lead-free part numbers
1, 18, 22
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2016 Maxim Integrated Products, Inc.
│ 23
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