ISL31483E, ISL31485E
NOT RECOMMENDED FOR NEW DESIGNS
RECOMMENDED REPLACEMENT PART
ISL32483E, ISL32485E
DATASHEET
FN7638
Rev 4.00
May 13, 2015
Fault Protected, Extended CMR, RS-485/RS-422 Transceivers with Cable Invert
The
ISL31483E
and
ISL31485E
are fault protected, 5V powered
differential transceivers that exceed the RS-485 and RS-422
standards for balanced communication. The RS-485 transceiver
pins (driver outputs and receiver inputs) are fault protected up to
±60V. Additionally, the extended common mode range allows
these transceivers to operate in environments with common
mode voltages up to ±25V (>2x the RS-485 requirement),
making this fault protected RS-485 family one of the most
robust on the market.
Transmitters deliver an exceptional 2.5V (typical) differential
output voltage into the RS-485 specified 54Ω load. This yields
better noise immunity than standard RS-485 ICs, or allows up
to six 120Ω terminations in star network topologies.
Receiver (Rx) inputs feature a “Full Fail-Safe” design, which
ensures a logic high Rx output if Rx inputs are floating, shorted,
or on a terminated but undriven (idle) bus.
The ISL31483E and ISL31485E include cable invert functions
that reverse the polarity of the Rx and/or Tx bus pins in case
the cable is misconnected. Unlike competing devices, Rx full
fail-safe operation is maintained even when the Rx input polarity
is switched.
Features
• Fault protected RS-485 bus pins . . . . . . . . . . . . . . up to ±60V
• Extended common mode range. . . . . . . . . . . . . . . . . . . . ±25V
More than twice the range required for RS-485
• Cable invert pins
corrects for reversed cable connections while maintaining
Rx full fail-safe functionality
• Full fail-safe (open, short, terminated) RS-485 receivers
• 1/4 unit load (UL) for up to 128 devices on the bus
• High Rx I
OL
for opto-couplers in isolated designs
• Hot plug circuitry - Tx and Rx outputs remain three-state
during power-up/power-down
• Slew rate limited RS-485 data rate . . . . . . . . . . . . . . . 1Mbps
• Low quiescent supply current. . . . . . . . . . . . . . . . . . . . 2.3mA
• Ultra low shutdown supply current. . . . . . . . . . . . . . . . . . 10µA
Applications
• Utility meters/automated meter reading systems
• High node count RS-485 systems
• PROFIBUS™ and RS-485 based field bus networks and
factory automation
• Security camera networks
• Building lighting and environmental control systems
• Industrial/process control networks
30
B
25
20
VOLTAGE (V)
15
10
5
RO
0
-5
TIME (400ns/DIV)
A
VID = ±1V
COMMON MODE RANGE
25
12
0
-7
-12
-20
-25
STANDARD RS-485
TRANSCEIVER
CLOSEST
COMPETITOR
ISL3148XE
FIGURE 1. EXCEPTIONAL Rx OPERATES AT 1Mbps EVEN WITH
±25V COMMON MODE VOLTAGE
FIGURE 2. TRANSCEIVERS DELIVER SUPERIOR COMMON MODE
RANGE vs STANDARD RS-485 DEVICES
FN7638 Rev 4.00
May 13, 2015
Page 1 of 18
ISL31483E, ISL31485E
Table of Contents
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Truth Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical Operating Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Test Circuits and Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver (Rx) Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver (Tx) Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Overvoltage (Fault) Protection Increases Ruggedness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Widest Common Mode Voltage (CMV) Tolerance Improves Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cable Invert (Polarity Reversal) Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High VOD Improves Noise Immunity and Flexibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hot Plug Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Rate, Cables and Terminations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Built-in Driver Overload Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Power Shutdown Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
11
11
11
11
11
12
12
12
12
13
Typical Performance Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Die Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
M14.15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
M8.15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
FN7638 Rev 4.00
May 13, 2015
Page 2 of 18
ISL31483E, ISL31485E
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ISL31483E
ISL31485E
HALF/FULL
DUPLEX
Full
Half
DATA RATE
(Mbps)
1
1
SLEW-RATE
LIMITED?
Yes
Yes
POLARITY
REVERSAL
PINS?
Yes
Yes
QUIESCENT I
CC
(mA)
2.3
2.3
LOW
POWER
SHDN?
Yes
No
EN PINS? HOT PLUG
Yes
Tx Only
Yes
Yes
PIN COUNT
14
8
Ordering Information
PART NUMBER
(Notes
1, 2, 3)
ISL31483EIBZ
ISL31485EIBZ
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to
TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-
free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see product information page for
ISL31483E, ISL31485E.
For more information on MSL, please see tech
brief
TB363
PART
MARKING
ISL31483 EIBZ
31485 EIBZ
TEMP. RANGE
(°C)
-40 to +85
-40 to +85
PACKAGE
(RoHS Compliant)
14 Ld SOIC
8 Ld SOIC
PKG.
DWG. #
M14.15
M8.15
FN7638 Rev 4.00
May 13, 2015
Page 3 of 18
ISL31483E, ISL31485E
Pin Configurations
ISL31483E
(14 LD SOIC)
TOP VIEW
RINV 1
RO 2
RE 3
DE 4
DI 5
GND 6
GND 7
D
R
14 V
CC
13 V
CC
12 A
11 B
10 Z
9 Y
8 DINV
RO 1
INV 2
DE 3
DI 4
D
ISL31485E
(8 LD SOIC)
TOP VIEW
R
8
7
6
5
V
CC
B/Z
A/Y
GND
Pin Descriptions
PIN
NAME
RO
PIN #
PIN #
ISL31483E ISL31485E
2
1
DESCRIPTION
Receiver output. If INV or RINV is low, then: If A - B
-10mV, RO is high; if A - B
-200mV, RO is low. If INV or RINV is high,
then: If B - A
-10mV, RO is high; if B - A
-200mV, RO is low. In all cases, RO = High if A and B are unconnected (floating),
or shorted together, or connected to an undriven, terminated bus (i.e., Rx is always failsafe open, shorted and idle, even
if polarity is inverted).
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high. Internally pulled low.
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high and they are high impedance
when DE is low. Internally pulled high to V
CC
.
Driver input. If INV or DINV is low, a low on DI forces output Y low and output Z high, while a high on DI forces output
Y high and output Z low. The output states relative to DI invert if INV or DINV is high.
Ground connection.
±60V Fault Protected RS-485/RS-422 level I/O pin. If INV is low, A/Y is the non-inverting receiver input and
non-inverting driver output. If INV is high, A/Y is the inverting receiver input and the inverting driver output. Pin is an
input if DE = 0; pin is an output if DE = 1.
±60V Fault Protected RS-485/RS-422 level I/O pin. If INV is low, B/Z is the inverting receiver input and inverting
driver output. If INV is high, B/Z is the non-inverting receiver input and the non-inverting driver output. Pin is an input
if DE = 0; pin is an output if DE = 1.
±60V Fault Protected RS-485/RS-422 level input. If RINV is low, then A is the non-inverting receiver input. If RINV is
high, then A is the inverting receiver input.
±60V Fault Protected RS-485/RS-422 level input. If RINV is low, then B is the inverting receiver input. If RINV is high,
then B is the non-inverting receiver input.
±60V Fault Protected RS-485/RS-422 level output. If DINV is low, then Y is the non-inverting driver output. If DINV
is high, then Y is the inverting driver output.
±60V Fault Protected RS-485/RS-422 level. If DINV is low, then Z is the inverting driver output. If DINV is high, then
Z is the non-inverting driver output.
System power supply input (4.5V to 5.5V).
Receiver and driver polarity selection input. When driven high this pin swaps the polarity of the driver output and receiver
input pins. If unconnected (floating) or connected low, normal RS-485 polarity conventions apply. Internally pulled low.
Receiver polarity selection input. When driven high this pin swaps the polarity of the receiver input pins. If unconnected
(floating) or connected low, normal RS-485 polarity conventions apply. Internally pulled low.
Driver polarity selection input. When driven high this pin swaps the polarity of the driver output pins. If unconnected
(floating) or connected low, normal RS-485 polarity conventions apply. Internally pulled low.
RE
DE
DI
GND
A/Y
3
4
5
6, 7
-
-
3
4
5
6
B/Z
-
7
A
B
Y
Z
V
CC
INV
RINV
DINV
12
11
9
10
13, 14
-
1
8
-
-
-
-
8
2
-
-
FN7638 Rev 4.00
May 13, 2015
Page 4 of 18
ISL31483E, ISL31485E
Truth Tables
TRANSMITTING
INPUTS
RE
X
X
X
X
0
1
DE
1
1
1
1
0
0
DI
1
0
1
0
X
X
INV or DINV
0
0
1
1
X
X
Y
1
0
0
1
High-Z
High-Z*
OUTPUTS
Z
0
1
1
0
High-Z
High-Z*
1
1
0
1
RE
0
0
0
0
0
DE
(Half Duplex)
0
0
0
0
0
RECEIVING
INPUTS
DE
(Full Duplex)
X
X
X
X
X
A-B
-0.01V
-0.2V
0.01V
0.2V
Inputs
Open or
Shorted
X
X
INV or
RINV
0
0
1
1
X
OUTPUT
RO
1
0
1
0
1
0
1
X
X
High-Z*
High-Z
NOTE: *Low Power Shutdown Mode (See
Note 11),
except for ISL31485E.
NOTE: *Low Power Shutdown Mode (See
Note 11),
except for ISL31485E.
Typical Operating Circuits
+5V
+
8
2
INV
1 RO
V
CC
R
R
T
0.1µF
0.1µF
+
8
V
CC
R
RO 1
+5V
A/Y
B/Z
6
7
R
T
7
6
B/Z
A/Y
3 DE
4 DI
D
GND
5
GND
5
D
DE 3
DI 4
INV
2
NOTE: The IC on the left has the cable connections
swapped, so the INV pin is strapped high to invert its Rx and
Tx polarity.
FIGURE 3. ISL31485E HALF DUPLEX EXAMPLE
+5V
+
RINV
2 RO
3 RE
4 DE
5 DI
8
Y 9
D
GND
6, 7
Z 10
R
T
11 B
12 A
GND
6, 7
R
1
13, 14
V
CC
R
B 11
A 12
0.1µF
R
T
0.1µF
+
13, 14
9 Y
10 Z
V
CC
D
DI 5
DE 4
RE 3
RO 2
RINV
DINV
1
8
+5V
DINV
NOTE: The IC on the left has the cable connections swapped, so the INV
pins (1, 8) are strapped high to invert its Rx and Tx polarity.
FIGURE 4. ISL31483E FULL DUPLEX EXAMPLE
FN7638 Rev 4.00
May 13, 2015
Page 5 of 18
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