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MAX3079E
User Manual
25 pgs514.22 Kb0

Rainbow Electronics MAX3079E User Manual

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 1; 1/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas 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.
PART TEMP RANGE PIN-PACKAGE
MAX3070EEPD -40°C to +85°C 14 Plastic DIP
MAX3070EESD -40°C to +85°C 14 SO
MAX3070EAPD -40°C to +125°C 14 Plastic DIP
MAX3070EASD -40°C to +125°C 14 SO
MAX3071EEPA -40°C to +85°C 8 Plastic 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 (VCC).............................................................+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
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
DRIVER
Differential Driver Output V
Change in Magnitude of Differential Output Voltage
Driver Common-Mode Output Voltage
Change in Magnitude of Common-Mode Voltage
Input High Voltage V
Input Low Voltage V
Input Hysteresis V
Input Current I
Input Impedance First Transition DE 1 10 kΩ
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) Full Duplex
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RL = 100Ω (RS422), Figure 1 2 V
RL = 54Ω (RS485), Figure 1 1.5 V
No load V
RL = 100Ω or 54Ω, Figure 1 (Note 2) 0.2 V
OD
RL = 100Ω or 54Ω, Figure 1 V
RL = 100Ω or 54Ω, Figure 1 (Note 2) 0.2 V
OC
DE, DI, RE, TXP, RXP, H/F 2V
IH
DE, DI, RE, TXP, RXP, H/F 0.8 V
IL
DE, DI, RE, TXP, RXP, H/F 100 mV DE, DI, RE ±1µA
TXP, RXP, H/F internal pulldown 10 40 µA
SRL = V
SRL = GND -75
DE = GND,
O
V
CC
= GND or 3.6V
CC
VIN = +12V 125
V
= -7V -100
IN
∆V
V
∆V
OD
OC
HYS
IN1
IN2
I
CC
CC
CC
CC
/ 2 3 V
75
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: ∆V
OD
and ∆VOCare 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.
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 ∆V
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
I
OSD
I
OSDF
TSH
A, B
V
OH
I
OZR
I
OSR
CC
I
SHDN
0 ≤ V
-7V ≤ V
(VCC - 1V) ≤ V
-7V ≤ V
TS
DE = GND, V
-7V ≤ VCM ≤ 12V -200 -125 -50 mV
TH
VA + VB = 0V 15 mV
TH
IO = -1mA VCC - 0.6 V
IO = 1mA 0.4 V
OL
0 ≤ VO ≤ V
-7V ≤ VCM ≤ 12V 96 kΩ
IN
0V ≤ VRO ≤ V
No load, RE = 0, DE = V No load, RE = VCC, DE = V 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 3.6
CC
CC
CC
CC
CC
V
= -7V -100
IN
175 °C
15 °C
± 1µA
±80 mA
0.8 1.5
0.8 1.5
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.)
)
)
Driver Propagation Delay
Driver Differential Output Rise or Fall Time
Differential Driver Output Skew |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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
- 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
Receiver Propagation Delay
Receiver Output Skew |t
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
- t
|
RPHL
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.)
)
)
Driver Propagation Delay
Driver Differential Output Rise or Fall Time
Differential Driver Output Skew |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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
- 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
Receiver Propagation Delay
Receiver Output Skew |t
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
- t
|
RPHL
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.)
)
)
Driver Propagation Delay
Driver Differential Output Rise or Fall Time
Differential Driver Output Skew |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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
- 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
50
50 200 600 ns
ns
Receiver Propagation Delay
Receiver Output Skew |t
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
- t
|
RPHL
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 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.)
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)
MAX3070E toc01
OUTPUT CURRENT (mA)
1007550250-25
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)
IO = -1mA
MAX3070E toc04
OUTPUT LOW VOLTAGE (V)
1007550250-25
vs. RECEIVER OUTPUT HIGH VOLTAGE
30
25
20
15
10
5
0
0 3.5
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-50 125
OUTPUT CURRENT
3.02.52.01.51.00.5
OUTPUT HIGH VOLTAGE (V)
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
OUTPUT CURRENT
0 3.5
OUTPUT HIGH VOLTAGE (V)
3.02.52.01.51.00.5
DRIVER OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
0 3.5
DIFFERENTIAL OUTPUT VOLTAGE (V)
3.02.51.5 2.01.00.5
MAX3070E toc03
MAX3070E toc06
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
vs. TRANSMITTER OUTPUT HIGH VOLTAGE
OUTPUT CURRENT
0
-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.)
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)
DRIVER PROPAGATION DELAY vs. TEMPERATURE (250kbps)
1000
900
MAX3070E toc10
800
700
600
DRIVER PROPAGATION DELAY (ns)
500
1007525 500-25
-50 125
t
DPLH
t
DPHL
TEMPERATURE (°C)
MAX3070E toc11
DRIVER PROPAGATION DELAY (ns)
1007550250-25
DRIVER PROPAGATION DELAY
vs. TEMPERATURE (500kbps)
500
450
400
350
300
250
200
-50 125
t
DPLH
t
DPHL
TEMPERATURE (°C)
MAX3070E toc12
1007550250-25
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
DRIVER PROPAGATION DELAY (250kbps)
vs. TEMPERATURE (250kbps AND 500kbps)
150
120
90
60
30
DRIVER PROPAGATION DELAY (ns)
0
-50 125
MAX3070E toc16
RECEIVER PROPAGATION DELAY
t
DPLH
t
DPHL
1007550250-25
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY
DI 2V/div
V
- V
Y
Z
2V/div
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE (16Mbps)
70
60
MAX3070E toc14
50
40
30
20
RECEIVER PROPAGATION DELAY (ns)
10
0
-50 125
(250kbps AND 500kbps)
t
DPLH
TEMPERATURE (°C)
MAX3070E toc17
- V
V
A
1V/div
RO 2V/div
t
DPHL
B
MAX3070E toc15
1007550250-25
1µs/div
200ns/div
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