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
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
_______________________________________________________________________________________ 9
Test Circuits and Waveforms
DRIVER PROPAGATION DELAY (500kbps)
MAX3070E toc18
400ns/div
V
Y
- V
Z
2V/div
DI
2V/div
DRIVER PROPAGATION DELAY (16Mbps)
MAX3070E toc19
10ns/div
V
Z
1V/div
V
Y
1V/div
DI
2V/div
RECEIVER PROPAGATION DELAY (16Mbps)
MAX3070E toc20
20ns/div
V
A
1V/div
V
B
1V/div
RO
2V/div
Typical Operating Characteristics (continued)
(VCC= 3.3V, TA = +25°C, unless otherwise noted. Note: The MAX3077EMSA/PR meets specification over temperature.)
Figure 1. Driver DC Test Load
Figure 2. Driver Timing Test Circuit
Figure 3. Driver Propagation Delays
Y
RL/2
V
OD
RL/2
Z
V
OC
3V
DE
DI
Y
V
OD
Z
R
L
C
L
V
CC
DI
V
DIFF
VCC/2
0
Z
V
O
Y
1/2 V
O
V
O
0
-V
10%
O
t
DR
t
DPLH
V
= V (Y) - V (Z)
DIFF
90%
t
SKEW = | tDPLH - tDPHL
t
|
DPHL
1/2 V
O
90%
t
DF
10%
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
10 ______________________________________________________________________________________
Test Circuits and Waveforms (continued)
Figure 4. Driver Enable and Disable Times (t
DHZ
, t
DZH
, t
DZH(SHDN)
)
Figure 5. Driver Enable and Disable Times (t
DZL
, t
DLZ
, t
DLZ(SHDN)
)
S1
0 OR 3V
D
C
L
50pF
R
= 500Ω
L
OUT
OUT
GENERATOR
DE
, t
t
DZH
DZH(SHDN)
VOM = (0 + VOH) / 2
50Ω
0 OR 3V
D
V
CC
V
/ 2
CC
0
0.25V
t
DHZ
V
OH
0
V
CC
= 500Ω
R
S1
C
L
50pF
L
OUT
GENERATOR
DE
, t
t
DZL
DZL(SHDN)
V
CC
OUT
V
OL
VOM = (VOL + VCC) / 2
50Ω
V
/ 2
CC
t
DLZ
V
CC
0
0.25V
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
______________________________________________________________________________________ 11
Test Circuits and Waveforms (continued)
Figure 6. Receiver Propagation Delay Test Circuit
Figure 7. Receiver Propagation Delays
Figure 8. Receiver Enable and Disable Times
B
ATE
V
ID
R
A
+1.5V
-1.5V
S1 OPEN
S2 CLOSED
S3 = +1.5V
RE
RO
S3
GENERATOR
t
RZH
RECEIVER
OUTPUT
, t
RZH(SHDN)
A
B
t
S1
S2
S1 CLOSED
S2 OPEN
S3 = -1.5V
RPLH
t
RZL
V
CC
, t
RZL(SHDN)
1.5V
(VOL + VCC) / 2
3V
0
V
CC
V
OL
V
ID
VOH / 2
V
OH
1.5V
V
RO
OL
THE RISE TIME AND FALL TIME OF INPUTS A AND B < 4ns
C
15pF
1kΩ
L
RE
RO
R
50Ω
3V
0
V
OH
0
t
RPHL
+1V
-1V
S1 OPEN
S2 CLOSED
S3 = +1.5V
RE
0.25V
RO
1.5V
t
RHZ
S1 CLOSED
S2 OPEN
3V
0
V
OH
0
RE
t
RLZ
RO
S3 = -1.5V
1.5V
0.25V
3V
0
V
CC
V
OL
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
12 ______________________________________________________________________________________
Pin Description
PIN
MAX3070E
MAX3073E
MAX3076E
FULL-DUPLEX
6, 7 4 5 7 7 GND Ground
10 6 — 10 — Z Inverting Driver Output
11 7 — 11 — B Inverting Receiver Input
MAX3071E
MAX3074E
MAX3077E
DEVICES
— — — 1 1 H/F
2 2 1 2 2 RO
3 — 2 3 3 RE
4 — 3 4 4 DE
5 3 4 5 5 DI
— — — 6 6 SRL
— — — 8 8 TXP
9 5 — 9 — Y Nonin verting Driver Output
— — — — 9 Y
— — — — 10 Z Inverting Driver Output and Inverting Rece iver Input*
— — — — 11 B Receiver Input Resistors*
— — 7 — — B Inverting Receiver Input and Inverting Driver Output
MAX3072E
MAX3075E
MAX3078E
HALF-
DUPLEX
DEVICES
MAX3079E
FULL-
DUPLE
X MODE
HALF-
DUPLE
X MODE
NAME FUNCTION
Half-/Full-Duplex Select Pin. Connect H/F to V
duplex mode; connect to GND or leave unconnected for
full-duplex mode.
Receiver Output. When RE is low and if (A - B) -50mV,
RO is high; if (A - B) -200mV, RO is low.
Receiver Output Enable. Drive RE low to enable RO; RO
is h igh impedance when RE is high. Drive RE high and
DE low to enter low-power shutdown mode. RE is a hotswap input (see the Hot-Swap Capabilit y section for
details).
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).
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.
Slew-Rate Limit Selector Pin. Connect SRL to ground for
16Mbps communication rate; connect to V
500kbps communication rate. Leave unconnected for
250kbps communication rate.
Transm itter Phase. Connect TXP to ground or leave
unconnected for normal transmitter phase/polarity.
Connect to V
Noninverting Driver Output and Noninverting Receiver
Input*
to in vert the transmitter phase/polarity.
CC
for half-
CC
for
CC
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
______________________________________________________________________________________ 13
MAX3070E/MAX3073E/MAX3076E
Pin Description (continued)
*
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.
MAX3071E/MAX3074E/MAX3077E
Function Tables
PIN
MAX3070E
MAX3073E
MAX3076E
FULL-DUPLEX
12 8 — 12 — A Noninverting Receiver Input
14 1 8 14 14 V
1, 8, 13 — — — — N.C.
MAX3071E
MAX3074E
MAX3077E
DEVICES
— — — — 12 A Receiver Input Resistors*
— — 6 — — A
— — — 13 13 RXP
MAX3072E
MAX3075E
MAX3078E
HALF-
DUPLEX
DEVICES
MAX3079E
FULL-
DUPLE
X MODE
HALF-
DUPLE
X MODE
NAME FUNCTION
Noninverting Receiver Input and Noninverting Driver
Output
Receiver Phase. Connect RXP to GND or leave
unconnected for normal transmitter phase/polarity.
Connect to V
Positive Supply V
CC
with a 0.1μF capacitor.
No Connect. Not internally connected. Can be
connected to GND.
to in vert rece iver phase/polar ity.
CC
= 3.3V ±10%. Bypass VCC to GND
CC
TRANSMITTING
INPUTS OUTPUTS
RE DE DI Z Y
X1101
X1010
0 0 X High-Z High-Z
1 0 X Shutdown
RECEIVING
INPUTS OUTPUT
RE DE A, B RO
0X≥ -50mV 1
0X≤ -200mV 0
0X
1 1 X High-Z
1 0 X Shutdown
Open/
shorted
1
TRANSMITTING
INPUT OUTPUTS
DI Z Y
101
010
RECEIVING
INPUTS OUTPUT
A, B RO
≥ -50mV 1
≤ -200mV 0
Open/shorted 1
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
14 ______________________________________________________________________________________
MAX3072E/MAX3075E/MAX3078E
Function Tables (continued)
MAX3079E
X = Don’t care; shutdown mode, driver and receiver outputs are high impedance.
TRANSMITTING
INPUTS OUTPUTS
RE DE DI B/Z A/Y
X1101
X1010
0 0 X High-Z High-Z
1 0 X Shutdown
INPUTS OUTPUTS
TXP RE DE DI Z Y
0X1101
0X1010
1X1110
1X1001
X 0 0 X High-Z High-Z
X 1 0 X Shutdown
TRANSMITTING
RECEIVING
INPUTS OUTPUTS
RE DE A-B RO
0X≥ -50mV 1
0X≤ -200mV 0
0X
1 1 X High-Z
1 0 X Shutdown
Open/
shorted
1
RECEIVING
INPUTS OUTPUTS
H/F RXP RE DE A, B Y, Z RO
0 0 0 X > -50mV X 1
0 0 0 X < -200mV X 0
0 1 0 X > -50mV X 0
0 1 0 X < -200mV X 1
1000X> -50mV 1
1000X< -200mV 0
1100X> -50mV 0
1100X< -200mV 1
0 0 0 X Open/shorted X 1
1000XOpen/shorted 1
0 1 0 X Open/shorted X 0
1100XOpen/shorted 0
X X 1 1 X X High-Z
X X 1 0 X X Shutdown
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
MAX3070E/MAX3072E/MAX3073E/MAX3075E/
MAX3076E/MAX3078E/MAX3079E also feature a hotswap 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.
The MAX3072E/MAX3075E/MAX3078E are half-duplex
transceivers, while the MAX3070E/MAX3071E/
MAX3073E/MAX3074E/MAX3076E/MAX3077E are fullduplex transceivers. The MAX3079E is selectable
between half- and full-duplex communication by driving
a selector pin (SRL) high or low, respectively.
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.
Receiver Input Filtering
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 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.
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 VCCor GND to the
enable inputs. Without the hot-swap capability, these
factors could improperly enable the transceiver’s driver
or receiver.
When VCCrises, an internal pulldown circuit holds DE
low and RE high. After the initial power-up sequence,
the pulldown circuit becomes transparent, resetting the
hot-swap tolerable input.
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 VCCramps from zero, an internal 10µs
timer turns 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, high-impedance CMOS input. Whenever V
CC
drops below 1V, the hot-swap input is reset.
For RE there is a complementary circuit employing two
PMOS devices pulling RE to VCC.
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
______________________________________________________________________________________ 15
MAX3070E–MAX3079E
MAX3079E Programming
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: VCC, GND, or unconnected. For
250kbps operation, set the three-state device in highimpedance mode or leave SRL unconnected. For
500kbps operation, drive SRL high or connect it to VCC.
For 16Mbps operation, drive SRL low or connect it to
GND. SRL can be changed during operation without
interrupting data communications.
Occasionally, twisted-pair lines are connected backward
from normal orientation. The 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 VCC. To invert the receiver
phase, drive RXP high or connect it to VCC. Note that the
receiver threshold is positive when RXP is high.
The MAX3079E can operate in full- or half-duplex
mode. Drive the H/F pin low, leave it unconnected
(internal pulldown), or connect it to GND for full-duplex
operation. 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 halfduplex 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.
±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
MAX3070E–MAX3079E keep working without latchup or
damage.
ESD protection can be tested in various ways. The
transmitter outputs and receiver inputs of the
MAX3070E–MAX3079E are characterized for protection
to the following limits:
• ±15kV using the Human Body Model
• ±6kV using the Contact Discharge method specified
in IEC 1000-4-2
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.
Human Body Model
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.
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.
The major difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
16 ______________________________________________________________________________________
Figure 9. Simplified Structure of the Driver Enable Pin (DE)
V
CC
10μs
TIMER
SR LATCH
TIMER
DE
5kΩ
100μA
500μA
M2M1
DE
(HOT SWAP)
current in IEC 1000-4-2, because series resistance is
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.
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.
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 32unit 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 32unit loads or fewer can be connected to the line.
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 = VCCor unconnected, are slew-rate limited. With SRL unconnected,
the MAX3079E error-free data transmission is up to
250kbps; with SRL connected to VCCthe data transmit
speeds up to 500kbps.
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
______________________________________________________________________________________ 17
Figure 10a. Human Body ESD Test Model
Figure 10b. Human Body Current Waveform
Figure 10c. IEC 1000-4-2 ESD Test Model
Figure 10d. IEC 1000-4-2 ESD Generator Current Waveform
HIGH-
VOLTAGE
DC
SOURCE
R
C
1MΩ
CHARGE-CURRENT-
LIMIT RESISTOR
C
s
100pF
R
D
1500Ω
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
HIGH-
VOLTAGE
DC
SOURCE
R
C
50MΩ TO 100MΩ
CHARGE-CURRENT-
LIMIT RESISTOR
C
150pF
s
R
D
330Ω
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
DEVICE
UNDER
TEST
I
r
DL
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
AMPS
IP 100%
90%
36.8%
10%
0
0
t
RL
TIME
t
CURRENT WAVEFORM
I
100%
90%
PEAK
I
10%
tr = 0.7ns TO 1ns
30ns
60ns
t
MAX3070E–MAX3079E
Low-Power Shutdown Mode (Except
MAX3071E/MAX3074E/MAX3077E)
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.
Enable times t
ZH
and tZL(see the
Switching
Characteristics
section) assume the part was not in a
low-power shutdown state. Enable times t
ZH(SHDN)
and
t
ZL(SHDN)
assume the parts were shut down. It takes
drivers and receivers longer to become enabled from
low-power shutdown mode (t
ZH(SHDN)
, t
ZL(SHDN)
) than
from driver/receiver-disable mode (tZH, tZL).
Driver Output Protection
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus contention.
The first, a foldback current limit on the output stage,
provides immediate protection against short circuits over
the whole common-mode voltage range (see 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.
Line Length
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.
Typical Applications
The MAX3072E/MAX3075E/MAX3078E/MAX3079E
transceivers are designed for bidirectional data communications on multipoint bus transmission lines. Figures
12 and 13 show typical network applications circuits.
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.
Chip Information
TRANSISTOR COUNT: 1228
PROCESS: BiCMOS
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
18 ______________________________________________________________________________________
Figure 11. Line Repeater for MAX3070E/MAX3071E/MAX3073E/
MAX3074E/MAX3076E/MAX3077E/MAX3079E in Full-Duplex
Mode
Figure 12. Typical Half-Duplex RS-485 Network
RO
RE
DE
DI
D
MAX3070E/MAX3071E/MAX3073E/
MAX3074E/MAX3076E/MAX3077E/
MAX3079E (FULL-DUPLEX)
A
R
B
120Ω
Z
Y
120Ω
DATA IN
DATA OUT
120Ω 120Ω
DI
D
DE
RO
RE
MAX3079E (HALF-DUPLEX)
R
MAX3072E
MAX3075E
MAX3078E
B
BB
R
D
DI RO DE
DE
AAA
R
D
DI
RO
B
A
RERE
DE
D
DI
R
RO
RE
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
______________________________________________________________________________________ 19
Figure 13. Typical Full-Duplex RS-485 Network
Selector Guide
A
RO
RE
DE
DI
R
D
B
Z
Y
120Ω
120Ω
YZBA
D
YZBA
R
D
R
120Ω
120Ω
MAX3070E
MAX3073E
Y
D
Z
B
R
A
MAX3076E
MAX3079E (FULL-DUPLEX)
DI
DE
RO
RE
DI
DE
RO
RE
RECEIVER/
DRIVER
ENABLE
TRANSCEIVERS
ON BUS
PINS
PART
HALF/FULL-
DUPLEX
DATA RATE
(Mbps)
SLEW-RATE
LIMITED
LOW -POWE R
SHUTDOWN
MAX3070E Fu ll 0.250 Yes Yes Yes 256 14
MAX3071E Full 0.250 Yes No No 256 8
MAX3072E Half 0.250 Yes Yes Yes 256 8
MAX3073E Ful l 0.5 Yes Yes Yes 256 14
MAX3074E Full 0.5 Yes No No 256 8
MAX3075E Half 0.5 Yes Yes Yes 256 8
MAX3076E Ful l 16 No Yes Yes 256 14
MAX3077E Full 16 No No No 256 8
MAX3078E Half 16 No Yes Yes 256 8
MAX3079E Selectable Selectable Selectable Yes Yes 256 14
DI
DE
RE
RO
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
20 ______________________________________________________________________________________
Pin Configurations and Typical Operating Circuits
MAX3071E
MAX3074E
MAX3077E
Rt
Rt
V
CC
GND
V
CC
GND
RO
DI
5
6
8
7
B
A
Z
Y
0.1μF
3
RO
DI
2
4
1
R
D
D
R
D
R
TYPICAL FULL-DUPLEX OPERATING CIRCUIT
V
CC
RO
DI
GND
A
B
Z
Y
8
7
6
5
1
2
3
4
DIP/SO
MAX3072E
MAX3075E
MAX3078E
Rt
Rt
DE
RE
B
A
B
A
0.1μF
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.
R
D
RO
DI
V
CC
B
A
GND
8
7
6
5
1
2
3
4
DIP/SO
RE
DE
R
D
RO
DI
V
CC
GND
8
7
6
5
1
2
3
4
RE
DE
D
R
DI
RO
V
N.C.
GND
GND
CC
DE
14
4
V
1
RO
2
R
RE
3
DE
4
DI
5
6
7
D
14
CC
N.C.
13
A
12
B
11
Z
10
Y
9
N.C.
8
N.C.
RO
DI
1, 8, 13
5
D
2
R
GND
3
RE
0.1μF
Y
9
10
Z
12
A
11
B
6, 7
TYPICAL FULL-DUPLEX OPERATING CIRCUIT
DIP/SO
MAX3070E
MAX3073E
MAX3076E
Rt
V
CC RE
Rt
R
GND DE
RO
DI
D
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
______________________________________________________________________________________ 21
Pin Configurations and Typical Operating Circuits (continued)
TOP VIEW
H/F
1
RO
2
RE
3
DE
4
MAX3079E
DI
5
SRL
6
GND
7
NOTE: SWITCH POSITIONS
INDICATED FOR H/F = GND.
V
RE
CC
DIP/SO
MAX3079E
RO
14
V
CC
13
RXP
12
A
11
B
Z
10
Y
9
TXP
8
RXP
H/F
TXP
DI
GND DE SRL
A
B
Z
Y
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
22 ______________________________________________________________________________________
Ordering Information (continued)
†Devices are available in both leaded (Pb) and lead(Pb)-free
packaging. Specify lead-free by adding a “+” after the part
number.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
8 Plastic DIP P8-2
21-0043
14 Plastic DIP P14-3
8 SO S8-4
21-0041
14 SO S14-1
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.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 PIN-PACKAGE
MAX3072EEPA -40°C to +85°C 8 Plast ic DIP
MAX3072EESA -40°C to +85°C 8 SO
MAX3072EAPA -40°C to +125°C 8 Plastic DIP
MAX3072EASA -40°C to +125°C 8 SO
MAX3073EEPD -40°C to +85°C 14 Plast ic DIP
MAX3073EESD -40°C to +85°C 14 SO
MAX3073EAPD -40°C to +125°C 14 Plast ic DIP
MAX3073EASD -40°C to +125°C 14 SO
MAX3074EEPA -40°C to +85°C 8 Plast ic DIP
MAX3074EESA -40°C to +85°C 8 SO
MAX3074EAPA -40°C to +125°C 8 Plastic DIP
MAX3074EASA -40°C to +125°C 8 SO
MAX3075EEPA -40°C to +85°C 8 Plast ic DIP
MAX3075EESA -40°C to +85°C 8 SO
MAX3075EAPA -40°C to +125°C 8 Plastic DIP
MAX3075EASA -40°C to +125°C 8 SO
PART† TEMP RANGE PIN-PACKAGE
MAX3076EEPD -40°C to +85°C 14 Plast ic DIP
MAX3076EESD -40°C to +85°C 14 SO
MAX3076EAPD -40°C to +125°C 14 Plast ic DIP
MAX3076EASD -40°C to +125°C 14 SO
MAX3077EEPA -40°C to +85°C 8 Plast ic DIP
MAX3077EESA -40°C to +85°C 8 SO
MAX3077EAPA -40°C to +125°C 8 Plastic DIP
MAX3077EASA -40°C to +125°C 8 SO
MAX3077EMSA/PR -55°C to +125°C 8 SO
MAX3078EEPA -40°C to +85°C 8 Plast ic DIP
MAX3078EESA -40°C to +85°C 8 SO
MAX3078EAPA -40°C to +125°C 8 Plastic DIP
MAX3078EASA -40°C to +125°C 8 SO
MAX3079EEPD -40°C to +85°C 14 Plast ic DIP
MAX3079EESD -40°C to +85°C 14 SO
MAX3079EAPD -40°C to +125°C 14 Plast ic DIP
MAX3079EASD -40°C to +125°C 14 SO
MAX3070E–MAX3079E
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
______________________________________________________________________________________ 23
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.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.
N
1
TOP VIEW
D
INCHES
DIM
MIN
0.053A
0.004
A1
0.014
B
0.007
C
e 0.050 BSC 1.27 BSC
0.150
HE
A
C
E
H 0.2440.228 5.80 6.20
0.016L
VARIATIONS:
INCHES
MINDIM
D
0.189 0.197 AA5.004.80 8
0.337 0.344 AB8.758.55 14
D
MAX
0.069
0.010
0.019
0.010
0.157
0.050
MAX
0.3940.386D
MILLIMETERS
MAX
MIN
1.35
1.75
0.10
0.25
0.35
0.49
0.19
0.25
3.80 4.00
0.40 1.27
MILLIMETERS
MAX
MIN
9.80 10.00
N MS012
16
AC
SOICN .EPS
e
FRONT VIEW
B
A1
L
0\-8\
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, .150" SOIC
REV.DOCUMENT CONTROL NO.APPROVAL
21-0041
1
B
1
Revision History
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.
24
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
+3.3V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceivers
MAX3070E–MAX3079E
REVISION
NUMBER
0 10/02 Initial release. —
2 4/09
REVISION
DATE
DESCRIPTION
Added /PR information to reflect new characterization information for military
temperature version.
PAGES
CHANGED
2, 3, 7, 8, 12, 13, 19,
22–25
Loading...