MAXIM MAX13085E User Manual
19-6016; Rev 0; 10/11
+5.0V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceiver
General Description
The MAX13085E +5.0V, ±15kV ESD-protected, RS-485/
RS-422 transceiver features one driver and one receiver.
The device includes 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 MAX13085E includes a hot-swap
capability to eliminate false transitions on the bus during
power-up or hot insertion.
The MAX13085E features reduced slew-rate drivers
that minimize EMI and reduce reflections caused by
improperly terminated cables, allowing error-free data
transmission up to 500kbps.
The MAX13085E is ideal for half-duplex communications
and it draws 1.2mA of supply current when unloaded
or when fully loaded with the drivers disabled. The
MAX13085E has a 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus.
The MAX13085E is available in an 8-pin SO and PDIP
packages.
MAX13085E
Features
S +5.0V Operation
S Extended ESD Protection for RS-485/RS-422 I/O
Pins ±15kV Human Body Model
S True Fail-Safe Receiver While Maintaining
EIA/TIA-485 Compatibility
S Hot-Swap Input Structures on DE and RE
S Enhanced Slew-Rate Limiting Facilitates Error-
Free Data Transmission
S Low-Current Shutdown Mode
S Allow Up to 256 Transceivers on the Bus
S Available in Industry-Standard 8-Pin SO and PDIP
Packages
Applications
Utility Meters
Lighting Systems
Industrial Control
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX13085EESA+
+Denotes a lead(Pb)-free/RoHS-compliant package.
-40NC to +85NC
8 SO
Telecom
Security Systems
Instrumentation
Profibus
Typical Operating Circuit
0.1µF
+
1
RO
RE
DE
DI
R
2
3
4
D
8
V
CC
B
7
6
5
TYPICAL HALF-DUPLEX OPERATING CIRCUIT
Rt
A
GND
MAX13085E
DE
DI
B
Rt
A
D
RO
R
RE
_______________________________________________________________ Maxim Integrated Products 1
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.
+5.0V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceiver
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
Supply Voltage (VCC) ........................................................... +6V
Control Input Voltage (RE, DE) ...............................-0.3V to +6V
Driver Input Voltage (DI) .........................................-0.3V to +6V
Driver Output Voltage (A, B) ....................................-8V to +13V
Receiver Input Voltage (A, B) ..................................-8V to +13V
Receiver Output Voltage (RO) ................. -0.3V to (VCC + 0.3V)
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
MAX13085E
maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = +5.0V ±10%, TA = T
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DRIVER
VCC Supply-Voltage Range V
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
at Power-Up
Input Impedance on First
Transition after POR Delay
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
MIN
to T
, unless otherwise noted. Typical values are at VCC = +5.0V and TA = +25NC.) (Note 1)
MAX
CC
RL = 100I (RS-422), Figure 1
RL = 54I (RS-485), Figure 1
No load V
RL = 100I or 54I, Figure 1 (Note 2)
OD
RL = 100I or 54I, Figure 1
RL = 100I or 54I, Figure 1 (Note 2)
OC
DE, DI, RE
IH
DE, DI, RE
IL
DE, DI, RE
DE, DI, RE
VDE, VRE = VRE = 2V
VDE = VRE = 2V
ft
0 P V
-7V P V
(VCC - 1V) P V
-7V P V
VDE = 0V,
VCC = 0V or V
-7V P VCM P +12V
VA + VB = 0V 15 mV
TH
P +12V (Note 3)
OUT
P VCC (Note 3)
OUT
P +1V (Note 3)
OUT
DV
V
DV
R
PWUP
I
OSD
I
OSDF
A, B
V
DV
OD
OC
HYS
IN1
R
TS
TSH
TH
Continuous Power Dissipation (TA = +70°C)
SO (derate 5.9mW/°C above +70°C) ..........................471mW
Operating Temperature Range .......................... -40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
Soldering Temperature (reflow) ......................................+260°C
4.5 5.5 V
P +12V (Note 3)
OUT
VIN = +12V 125
CC
VIN = -7V -100
3 V
2 V
VCC/2 3 V
3 V
100 mV
3.65 8.8
7 60 kΩ
40 250
-250 -40
20
175
15
-200 -125 -50 mV
CC
CC
CC
0.2 V
0.2 V
0.8 V
Q1 FA
-20
V
kI
mA
mA
NC
NC
FA
2 ______________________________________________________________________________________
+5.0V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceiver
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5.0V ±10%, TA = T
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
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 A and B
MIN
to T
, unless otherwise noted. Typical values are at VCC = +5.0V and TA = +25NC.) (Note 1)
MAX
OH
OL
I
OZR
I
OSR
CC
I
SHDN
IO = -1mA
IO = 1mA 0.4 V
0 P VO P VCC P 1 FA
-7V P VCM P +12V
IN
0V P VRO P V
No load, VRE = 0V, DE = V
No load, RE = VCC, DE = V
No load, VRE = 0V, VDE = 0V
RE = VCC, VDE = 0V
Human Body Model
Contact Discharge
IEC 61000-4-2, level 4
Air-Gap Discharge
IEC 61000-4-2
CC
CC
CC
VCC -
0.6
96
P 110
1.2 1.8
1.2 1.8
1.2 1.8
2.8 10
Q15
Q8
Q15
MAX13085E
V
kI
mA
mA
FA
kV
DRIVER SWITCHING CHARACTERISTICS WITH INTERNAL SRL (500kbps)
(VCC = +5.0V ±10%, TA = T
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Driver Propagation Delay
Driver Differential Output Rise or
Fall Time
Differential Driver Output Skew
|t
- t
DPHL
|
_______________________________________________________________________________________ 3
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
MIN
to T
, unless otherwise noted. Typical values are at VCC = +5.0V and TA = +25NC.) (Note 1)
MAX
t
DPLH
t
DPHL
t
R , tF
t
DSKEW
DZH
DZL
DLZ
DHZ
t
DZH(SHDN)
t
DZL(SHDN)
SHDN
CL = 50pF, RL = 54I, Figures 2 and 3
CL = 50pF, RL = 54I, Figures 2 and 3
CL = 50pF, RL = 54I, Figures 2 and 3
Figure 4 2500 ns
Figure 5 2500 ns
Figure 5 100 ns
Figure 4 100 ns
Figure 4 5500 ns
Figure 5 5500 ns
200 1000
200 1000
250 900 ns
140 ns
50 340 700 ns
ns
+5.0V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceiver
RECEIVER SWITCHING CHARACTERISTICS WITH INTERNAL SRL (500kbps)
(VCC = +5.0V ±10%, TA = T
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Receiver Propagation Delay
Receiver Output Skew
|t
- t
RPLH
RPHL
|
Maximum Data Rate 500 kbps
Receiver Enable to Output Low t
MAX13085E
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
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: ΔVOD and ΔVOC are the changes in VOD and 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
output current applies during current limiting to allow a recovery from bus contention.
MIN
to T
, unless otherwise noted. Typical values are at VCC = +5.0V and TA = +25NC.) (Note 1)
MAX
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 5500 ns
Figure 8 5500 ns
50 340 700 ns
200
200
ns
Test Circuits and Waveforms
B
RL/2
V
OD
R
L
A
Figure 1. Driver DC Test Load
V
CC
DE
DI
B
V
A
Figure 2. Driver Timing Test Circuit
V
/2
OC
R
OD
L C
L
V
CC
DI
VCC/2
0
Z
V
O
Y
1/2 V
O
V
O
V
DIFF
0
10%
-V
O
t
R
t
SKEW
t
90%
DPLH
= |
V
= V (B) - V (A)
DIFF
t
DPLH
-
Figure 3. Driver Propagation Delays
t
DPHL
t
DPHL
|
1/2 V
O
90%
t
F
10%
4 ______________________________________________________________________________________
+5.0V, ±15kV ESD-Protected, Fail-Safe,
Hot-Swap, RS-485/RS-422 Transceiver
Test Circuits and Waveforms (continued)
S1
0 OR V
CC
D
C
L
50pF
R
= 500Ω
L
OUT
MAX13085E
GENERATOR
DE
t
, t
DZH
DZH(SHDN)
OUT
Figure 4. Driver Enable and Disable Times (t
0 OR V
VOM = (0 + VOH)/2
, t
DHZ
DZH
CC
50Ω
, t
DZH(SHDN)
D
V
CC
VCC/2
0
0.25V
t
DHZ
V
OH
0
)
V
CC
R
= 500Ω
S1
C
L
50pF
L
OUT
GENERATOR
DE
t
, t
DZL
DZL(SHDN)
V
CC
OUT
V
OL
Figure 5. Driver Enable and Disable Times (t
_______________________________________________________________________________________ 5
50Ω
VOM = (VOL + VCC)/2
, t
DZL
DLZ, tDLZ(SHDN)
V
CC
VCC/2
0
t
DLZ
0.25V
)
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