MAXIM MAX3070E, MAX3079E Technical data
General Description
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 MAX3070E–MAX3079E include a
hot-swap capability to eliminate false transitions on the
bus during power-up or hot insertion.
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 slewrate-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.
The MAX3072E/MAX3075E/MAX3078E are intended for
half-duplex communications, and the MAX3070E/
MAX3071E/MAX3073E/MAX3074E/MAX3076E/MAX307
7E 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.
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
Features
♦ 3.3V Operation
♦ Electrostatic Discharge (ESD) Protection for
RS-485 I/O Pins
±15kV Human Body Model
♦ True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
♦ Hot-Swap Input Structure on DE and RE
♦ Enhanced Slew-Rate Limiting Facilitates Error-
Free Data Transmission
(MAX3070E–MAX3075E/MAX3079E)
♦ Low-Current Shutdown Mode (Except
MAX3071E/MAX3074E/MAX3077E)
♦ Pin-Selectable Full-/Half-Duplex Operation
(MAX3079E)
♦ Phase Controls to Correct for Twisted-Pair
Reversal (MAX3079E)
♦ Allow Up to 256 Transceivers on the Bus
♦ Available in Industry-Standard 8-Pin SO Package
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
19-2668; Rev 2; 4/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Selector Guide, Pin Configurations, and Typical Operating
Circuits appear at end of data sheet.
Ordering Information continued at end of data sheet.
†Devices are available in both leaded (Pb) and lead(Pb)-free
packaging. Specify lead-free by adding a “+” after the part
number.
PART† TEMP RANGE PIN-PACKAGE
MAX3070EEPD -40°C to +85°C 14 Plast ic DIP
MAX3070EESD -40°C to +85°C 14 SO
MAX3070EAPD -40°C to +125°C 14 Plast ic DIP
MAX3070EASD -40°C to +125°C 14 SO
MAX3071EEPA -40°C to +85°C 8 Plast ic DIP
MAX3071EESA -40°C to +85°C 8 SO
MAX3071EAPA -40°C to +125°C 8 Plastic DIP
MAX3071EASA -40°C to +125°C 8 SO
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC= 3.3V ±10%, TA=T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= 3.3V and TA= +25°C.) (Note 1)
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.
(All voltages referenced to GND)
Supply Voltage (V
CC
).............................................................+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
Full Duplex (A, B) ..................................................-8V to +13V
Receiver Output Voltage (RO)....................-0.3V to (V
CC
+ 0.3V)
Driver Output Current .....................................................±250mA
Continuous Power Dissipation (T
A
= +70°C)
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
DRIVER
Differentia l Driver Output V
Change in Magnitude of
Differentia l Output Voltage
Driver Common-Mode Output
Voltage
Change in Magnitude of
Common-Mode Voltage
Input High Voltage VIH DE, DI, RE, TXP, RXP, H/F 2 V
Input Low Voltage V
Input Hystere sis V
Input Current I
Input Impedance First Transition DE 1 10 k
Input Current I
SRL Input High Voltage VCC - 0.4 V
SRL Input Middle Voltage VCC x 0.4 VCC x 0.6 V
SRL Input Low Voltage 0.4 V
SRL Input Current
Output Leakage (Y and Z)
Ful l Duplex
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RL = 100 (RS422), Figure 1 2 V
RL = 54 (RS485), Figure 1 1.5 V
No load V
RL = 100 or 54, Figure 1 (Note 2) 0.2 V
OD
RL = 100 or 54, Figure 1 V
RL = 100 or 54, Figure 1 (Note 2) 0.2 V
OC
DE, DI, RE, TXP, RXP, H/F 0.8 V
IL
DE, DI, RE, TXP, RXP, H/F 100 mV
DE, DI, RE ±1 μA
TXP, RXP, H/F internal pul ldown 10 40 μA
SRL = VCC 75
SRL = GND -75
O
DE = GND,
= GND or 3.6V
V
CC
VIN = +12V 125
V
= -7V -100
IN
V
V
V
OD
OC
HYS
IN1
IN2
I
CC
CC
CC
/ 2 3 V
CC
V
μA
μA
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC= 3.3V ±10%, TA=T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= 3.3V and TA= +25°C.) (Note 1)
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
OD
and ΔVOCare the changes in VODand VOC, respectively, when the DI input changes state.
Note 3: The short-circuit output current applies to peak current just prior to foldback current limiting. The short-circuit foldback out-
put current applies during current limiting to allow a recovery from bus contention.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Driver Short-Circuit Output
Current
Driver Short-Circuit Foldback
Output Current
Thermal-Shutdown Threshold T
Thermal-Shutdown Hysteresis T
Input Current (A and B) I
RECEIVER
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis VTH VA + VB = 0V 15 mV
RO Output High Voltage V
RO Output Low Voltage V
Three-State Output Current at
Receiver
Receiver Input Resistance R
Receiver Output Short-Circuit
Current
SUPPLY CURRENT
Supply Current I
Supply Current in Shutdown
Mode
ESD PROTECTION
ESD Protection for Y, Z, A, and B Human Body Model ±15 kV
I
OSD
I
OSDF
TSH
A, B
V
OH
OL
I
OZR
I
OSR
CC
I
SHDN
0 V
-7V V
(VCC - 1V) V
-7V V
175 °C
TS
15 °C
DE = GND,
V
CC
-7V VCM 12V -200 -125 -50 mV
TH
IO = -1mA VCC - 0.6 V
IO = 1mA 0.4 V
0 VO VCC ± 1 μA
-7V VCM 12V 96 k
IN
0V VRO VCC ±80 mA
No load, RE = 0, DE = VCC 0.8 1.5
No load, RE = VCC, DE = VCC 0.8 1.5
No load, RE = 0, DE = 0 0.8 1.5
RE = VCC, DE = GND 0.05 10 μA
12V (Note 3) 40 250
OUT
VCC (Note 3) -250 -40
OUT
12V (Note 3) 20
OUT
1V (Note 3) -20
OUT
VIN = +12V 125
= GND or 3.6V
= -7V -100
V
IN
mA
mA
μA
mA
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
4 _______________________________________________________________________________________
DRIVER SWITCHING CHARACTERISTICS
MAX3070E/MAX3071E/MAX3072E/MAX3079E with SRL = UNCONNECTED (250kbps)
(VCC= 3.3V ±10%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= 3.3V and TA= +25°C.)
)
)
RECEIVER SWITCHING CHARACTERISTICS
MAX3070E/MAX3071E/MAX3072E/MAX3079E with SRL = UNCONNECTED (250kbps)
(VCC= 3.3V ±10%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= 3.3V and TA= +25°C.)
)
)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Driver Propagation Delay
Driver Differential Output Rise or
Fall Time
Differential Driver Output Skew
- t
|t
DPLH
Maximum Data Rate 250 kbps
Driver Enable to Output High t
Driver Enable to Output Low t
Driver Disable Time from Low t
Driver Disable Time from High t
Driver Enable from Shutdown to
Output High
Driver Enable from Shutdown to
Output Low
Time to Shutdown t
DPHL
|
t
DPLH
t
DPHL
t
DR , tDFCL
t
DSKEW
DZH
DZL
DLZ
DHZ
t
DZH(SHDN
t
DZL(SHDN
SHDN
CL= 50pF, RL= 54Ω, Figures 2 and 3
= 50pF, RL= 54Ω, Figures 2 and 3 350 1600 ns
CL= 50pF, RL= 54Ω, Figures 2 and 3 200 ns
Figure 4 2500 ns
Figure 5 2500 ns
Figure 5 100 ns
Figure 4 100 ns
Figure 4 5500 ns
Figure 5 5500 ns
250 1500
250 1500
50 200 600 ns
ns
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Receiver Propagation Delay
Receiver Output Skew
|t
- t
RPHL
|
RPLH
Maximum Data Rate 250 kbps
Receiver Enable to Output Low t
Receiver Enable to Output High t
Receiver Disable Time from Low t
Receiver Disable Time from High t
Receiver Enable from Shutdown
to Output High
Receiver Enable from Shutdown
to Output Low
Time to Shutdown t
t
RPLH
t
RPHL
t
RSKEW
RZL
RZH
RLZ
RHZ
t
RZH(SHDN
t
RZL(SHDN
SHDN
CL = 15pF, Figures 6 and 7
CL = 15pF, Figures 6 and 7 30 ns
Figure 8 50 ns
Figure 8 50 ns
Figure 8 50 ns
Figure 8 50 ns
Figure 8 4000 ns
Figure 8 4000 ns
200
200
50 200 600 ns
ns
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
_______________________________________________________________________________________ 5
DRIVER SWITCHING CHARACTERISTICS
MAX3073E/MAX3074E/MAX3075E/MAX3079E with SRL = VCC(500kbps)
(VCC= 3.3V ±10%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= 3.3V and TA= +25°C.)
)
)
RECEIVER SWITCHING CHARACTERISTICS
MAX3073E/MAX3074E/MAX3075E/MAX3079E with SRL = VCC(500kbps)
(VCC= 3.3V ±10%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= 3.3V and TA= +25°C.)
)
)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Driver Propagation Delay
Driver Differential Output Rise or
Fall Time
Differential Driver Output Skew
- t
|t
DPLH
Maximum Data Rate 500 kbps
Driver Enable to Output High t
Driver Enable to Output Low t
Driver Disable Time from Low t
Driver Disable Time from High t
Driver Enable from Shutdown to
Output High
Driver Enable from Shutdown to
Output Low
Time to Shutdown t
DPHL
|
t
DPLH
t
DPHL
t
DR , tDFCL
t
DSKEW
DZH
DZL
DLZ
DHZ
t
DZH(SHDN
t
DZL(SHDN
SHDN
CL = 50pF, RL = 54Ω, Figures 2 and 3
= 50pF, RL = 54Ω, Figures 2 and 3 200 800 ns
CL = 50pF, RL = 54Ω, Figures 2 and 3 100 ns
Figure 4 2500 ns
Figure 5 2500 ns
Figure 5 100 ns
Figure 4 100 ns
Figure 4 4500 ns
Figure 5 4500 ns
180 800
180 800
50 200 600 ns
ns
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Receiver Propagation Delay
Receiver Output Skew
|t
- t
RPHL
|
RPLH
Maximum Data Rate 500 kbps
Receiver Enable to Output Low t
Receiver Enable to Output High t
Receiver Disable Time from Low t
Receiver Disable Time from High t
Receiver Enable from Shutdown
to Output High
Receiver Enable from Shutdown
to Output Low
Time to Shutdown t
t
RPLH
t
RPHL
t
RSKEWCL
RZL
RZH
RLZ
RHZ
t
RZH(SHDN
t
RZL(SHDN
SHDN
CL = 15pF, Figures 6 and 7
= 15pF, Figures 6 and 7 30 ns
Figure 8 50 ns
Figure 8 50 ns
Figure 8 50 ns
Figure 8 50 ns
Figure 8 4000 ns
Figure 8 4000 ns
200
200
50 200 600 ns
ns
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
6 _______________________________________________________________________________________
DRIVER SWITCHING CHARACTERISTICS
MAX3076E/MAX3077E/MAX3078E/MAX3079E with SRL = GND (16Mbps)
(VCC= 3.3V ±10%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= 3.3V and TA= +25°C.)
)
)
RECEIVER SWITCHING CHARACTERISTICS
MAX3076E/MAX3077E/MAX3078E/MAX3079E with SRL = GND (16Mbps)
(VCC= 3.3V ±10%, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at VCC= 3.3V and TA= +25°C.)
)
)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Driver Propagation Delay
Driver Differential Output Rise or
Fall Time
Differential Driver Output Skew
- t
|t
DPLH
Maximum Data Rate 16 Mbps
Driver Enable to Output High t
Driver Enable to Output Low t
Driver Disable Time from Low t
Driver Disable Time from High t
Driver Enable from Shutdown to
Output High
Driver Enable from Shutdown to
Output Low
Time to Shutdown t
DPHL
|
t
DPLH
t
DPHL
t
DR , tDFCL
t
DSKEW
DZH
DZL
DLZ
DHZ
t
DZH(SHDN
t
DZL(SHDN
SHDN
CL = 50pF, RL= 54Ω, Figures 2 and 3
= 50pF, RL= 54Ω, Figures 2 and 3 15 ns
CL = 50pF, RL= 54Ω, Figures 2 and 3 8 ns
Figure 4 150 ns
Figure 5 150 ns
Figure 5 100 ns
Figure 4 100 ns
Figure 4 1250 1800 ns
Figure 5 1250 1800 ns
50 200 600 ns
50
50
ns
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Receiver Propagation Delay
Receiver Output Skew
|t
- t
RPHL
|
RPLH
Maximum Data Rate 16 Mbps
Receiver Enable to Output Low t
Receiver Enable to Output High t
Receiver Disable Time from Low t
Receiver Disable Time from High t
Receiver Enable from Shutdown
to Output High
Receiver Enable from Shutdown
to Output Low
Time to Shutdown t
t
RPLH
t
RPHL
t
RSKEW
RZL
RZH
RLZ
RHZ
t
RZH(SHDN
t
RZL(SHDN
SHDN
CL = 15pF, Figures 6 and 7
CL = 15pF, Figures 6 and 7 8 ns
Figure 8 50 ns
Figure 8 50 ns
Figure 8 50 ns
Figure 8 50 ns
Figure 8 1800 ns
Figure 8 1800 ns
40 75
40 75
50 200 600 ns
ns
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
_______________________________________________________________________________________
7
Typical Operating Characteristics
(VCC= 3.3V, TA = +25°C, unless otherwise noted. Note: The MAX3077EMSA/PR meets specification over temperature.)
SUPPLY CURRENT vs. TEMPERATURE
1.0
0.9
DE = V
0.8
0.7
SUPPLY CURRENT (mA)
0.6
0.5
-50 125
CC
DE = 0
TEMPERATURE (°C)
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
3.30
3.25
3.20
3.15
3.10
OUTPUT HIGH VOLTAGE (V)
3.05
3.00
-50 125
TEMPERATURE (°C)
1007550250-25
IO = -1mA
1007550250-25
30
25
MAX3070E toc01
20
15
10
OUTPUT CURRENT (mA)
5
0
0.8
0.7
MAX3070E toc04
0.6
0.5
0.4
0.3
OUTPUT LOW VOLTAGE (V)
0.2
0.1
0
-50 125
vs. RECEIVER OUTPUT HIGH VOLTAGE
OUTPUT CURRENT
0 3.5
OUTPUT HIGH VOLTAGE (V)
3.02.52.01.51.00.5
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
IO = -1mA
10075-25 0 25 50
TEMPERATURE (°C)
35
30
MAX3070E toc02
25
20
15
OUTPUT CURRENT (mA)
10
5
0
100
90
80
MAX3070E toc05
70
60
50
40
30
OUTPUT CURRENT (mA)
20
10
0
vs. RECEIVER OUTPUT LOW VOLTAGE
0 3.5
0 3.5
OUTPUT CURRENT
OUTPUT HIGH VOLTAGE (V)
DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
DIFFERENTIAL OUTPUT VOLTAGE (V)
MAX3070E toc03
3.02.52.01.51.00.5
MAX3070E toc06
3.02.51.5 2.01.00.5
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
2.60
2.50
2.40
2.30
2.20
2.10
2.00
1.90
1.80
DIFFERENTIAL OUTPUT VOLTAGE (V)
1.70
1.60
-50 125
TEMPERATURE (°C)
RL = 54Ω
1007525 500-25
160
140
XMAX3070E toc07
120
100
80
60
OUTPUT CURRENT (mA)
40
20
0
vs. TRANSMITTER OUTPUT HIGH VOLTAGE
OUTPUT CURRENT
-7 4
OUTPUT HIGH VOLTAGE (V)
32-6 -5 -4 -2 -1 0-3 1
180
160
MAX3070E toc08
140
120
100
80
60
OUTPUT CURRENT (mA)
40
20
0
vs. TRANSMITTER OUTPUT LOW VOLTAGE
OUTPUT CURRENT
MAX3070E toc09
012
OUTPUT LOW VOLTAGE (V)
108642
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VCC= 3.3V, TA = +25°C, unless otherwise noted. Note: The MAX3077EMSA/PR meets specification over temperature.)
SHUTDOWN CURRENT
vs. TEMPERATURE
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
SHUTDOWN CURRENT (μA)
0.4
0.2
0
-50 125
TEMPERATURE (°C)
1007525 500-25
1000
900
MAX3070E toc10
800
700
600
DRIVER PROPAGATION DELAY (ns)
500
-50 125
DRIVER PROPAGATION DELAY
DRIVER PROPAGATION DELAY (ns)
vs. TEMPERATURE (16Mbps)
30
25
20
t
15
10
5
0
-50 125
DPLH
t
DPHL
TEMPERATURE (°C)
1007550250-25
MAX3070E toc13
vs. TEMPERATURE (250kbps AND 500kbps)
150
120
90
60
30
DRIVER PROPAGATION DELAY (ns)
0
-50 125
DRIVER PROPAGATION DELAY
vs. TEMPERATURE (250kbps)
t
DPLH
t
DPHL
1007550250-25
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY
t
DPLH
t
DPHL
1007550250-25
TEMPERATURE (°C)
DRIVER PROPAGATION DELAY
vs. TEMPERATURE (500kbps)
500
450
MAX3070E toc11
400
350
300
DRIVER PROPAGATION DELAY (ns)
250
200
-50 125
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE (16Mbps)
70
60
MAX3070E toc14
50
40
30
20
RECEIVER PROPAGATION DELAY (ns)
10
0
-50 125
t
DPLH
t
DPHL
TEMPERATURE (°C)
t
DPLH
t
DPHL
TEMPERATURE (°C)
MAX3070E toc12
1007550250-25
MAX3070E toc15
1007550250-25
DRIVER PROPAGATION DELAY (250kbps)
1μs/div
MAX3070E toc16
DI
2V/div
V
- V
Y
2V/div
Z
(250kbps AND 500kbps)
200ns/div
MAX3070E toc17
RECEIVER PROPAGATION DELAY
- V
V
A
1V/div
RO
2V/div
B
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