DATASHEET
ISL32483E, ISL32485E
Fault Protected, Extended CMR, RS-485/RS-422 Transceivers with Cable Invert
and ±16.5kV ESD
The
ISL32483E
and
ISL32485E
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 and are protected against ±16.5kV ESD strikes without
latch-up. 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 (Tx) 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 ISL32483E and ISL32485E 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.
For fault protected RS-485 transceivers without the cable
invert function, please see the
ISL32470E
and
ISL32490E
datasheets.
FN7785
Rev 3.00
May 13, 2015
Features
• Fault protected RS-485 bus pins . . . . . . . . . . . . . . up to ±60V
• Extended common mode range. . . . . . . . . . . . . . . . . . . . ±25V
more than twice the range required for RS-485
• ±16.5kV HBM ESD protection on RS-485 bus pins
• 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
ISL3248XE
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
FN7785 Rev 3.00
May 13, 2015
Page 1 of 17
ISL32483E, ISL32485E
TABLE 1. SUMMARY OF FEATURES
HALF/FULL
DUPLEX
Full
Half
DATA RATE
(Mbps)
1
1
SLEW-RATE
LIMITED?
Yes
Yes
EN
PINS?
Yes
Tx Only
HOT
PLUG
Yes
Yes
POLARITY
REVERSAL
PINS?
Yes
Yes
QUIESCENT I
CC
(mA)
2.3
2.3
LOW
POWER
SHDN?
Yes
No
PART NUMBER
ISL32483E
ISL32485E
PIN COUNT
14
8
Ordering Information
PART NUMBER
(Notes
1, 2, 3)
ISL32483EIBZ
ISL32485EIBZ
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 device information page for
ISL32483E
and
ISL32485E.
For more information on MSL please see
techbrief
TB363.
PART
MARKING
ISL32483 EIBZ
32485 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
Pin Configurations
ISL32483E
(14 LD SOIC)
TOP VIEW
RINV 1
RO 2
RE 3
DE 4
DI 5
GND 6
GND 7
D
R
14 VCC
13 VCC
12 A
11 B
10 Z
9 Y
8 DINV
RO 1
INV 2
DE 3
DI 4
D
ISL32485E
(8 LD SOIC)
TOP VIEW
R
8
7
6
5
VCC
B/Z
A/Y
GND
FN7785 Rev 3.00
May 13, 2015
Page 2 of 17
ISL32483E, ISL32485E
Pin Descriptions
PIN
NAME
RO
ISL32483E
PIN #
2
ISL32485E
PIN #
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
fail safe 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 and ±16.5kV HBM ESD Protected RS-485/RS-422 level I/O pin. If INV is low than, A/Y is the
noninverting receiver input and noninverting driver output. If INV is high, than 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 and ±16.5kV HBM ESD Protected RS-485/RS-422 level I/O pin. If INV is low, than B/Z is the
inverting receiver input and inverting driver output. If INV is high, than B/Z is the noninverting receiver input
and the noninverting driver output. Pin is an input if DE = 0; pin is an output if DE = 1.
±60V Fault and ±15kV HBM ESD Protected RS-485/RS-422 level input. If RINV is low, then A is the
noninverting receiver input. If RINV is high, then A is the inverting receiver input.
±60V Fault and ±15kV HBM ESD 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 noninverting receiver input.
±60V Fault and ±15kV HBM ESD Protected RS-485/RS-422 level output. If DINV is low, then Y is the
noninverting driver output. If DINV is high, then Y is the inverting driver output
±60V Fault and ±15kV HBM ESD 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 noninverting 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
VCC
INV
12
11
9
10
13, 14
-
-
-
-
-
8
2
RINV
DINV
1
8
-
-
FN7785 Rev 3.00
May 13, 2015
Page 3 of 17
ISL32483E, ISL32485E
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
OUTPUTS
Z
0
1
1
0
High-Z
RE
0
0
0
0
0
RECEIVING
INPUTS
DE
DE
(Half Duplex) (Full Duplex)
0
0
0
0
0
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
High-Z
High-Z
(see Note) (see Note)
1
1
0
1
0
1
X
X
NOTE: Low Power Shutdown Mode (see
Note 11
on
page 7),
except for
ISL32485E.
High-Z
(see Note)
High-Z
NOTE: Low Power Shutdown Mode (see
Note 11
on
page 7),
except for
ISL32485E.
Typical Operating Circuits
+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
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 3. ISL32483E FULL DUPLEX EXAMPLE
FN7785 Rev 3.00
May 13, 2015
Page 4 of 17
ISL32483E, ISL32485E
Absolute Maximum Ratings
V
CC
to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, INV, RINV, DINV, DE, RE. . . . . . . . . . . . . . . . . . . . -0.3V to (V
CC
+ 0.3V)
Input/Output Voltages
A/Y, B/Z, A, B, Y, Z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±60V
A/Y, B/Z, A, B, Y, Z (Transient Pulse Through 100Ω, see
Note 15)
±80V
RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (V
CC
+0.3V)
Short-circuit Duration
Y, Z. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
ESD Rating . . . . . . . . . . . . . . . . . . . . see
“ESD PERFORMANCE” on page 6
Latch-up (Tested per JESD78, Level 2, Class A). . . . . . . . . . . . . . . . +125°C
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
8 Ld SOIC Package (Notes
4, 5).
. . . . . . . . .
104
47
14 Ld SOIC Package (Notes
4, 5)
. . . . . . . .
78
42
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . . -65°C to +150°C
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .see
TB493
Recommended Operating Conditions
Supply Voltage (V
CC
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Bus Pin Common Mode Voltage Range . . . . . . . . . . . . . . . . . -25V to +25V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief
TB379
for details.
5. For
JC
, the “case temp” location is taken at the package top center.
Boldface limits apply across the operating temperature range, -40°C to +85°C.
PARAMETER
DC CHARACTERISTICS
Driver Differential V
OUT
(No load)
Driver Differential V
OUT
(Loaded,
Figure 4A)
V
OD1
V
OD2
R
L
= 100Ω (RS-422)
R
L
= 54Ω (RS-485)
R
L
= 54Ω (PROFIBUS, V
CC
≥
5V)
SYMBOL
TEST CONDITIONS
Electrical Specifications
Test Conditions: V
CC
= 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at V
CC
= 5V, T
A
= +25°C (Note
6).
TEMP
(°C)
Full
Full
Full
Full
Full
Full
MIN
(Note
14)
-
2.4
1.5
2.0
0.8
-
TYP
-
3.2
2.5
2.5
1.3
-
MAX
(Note
14)
V
CC
-
V
CC
-
-
0.2
UNIT
V
V
V
V
V
V
R
L
= 21Ω (Six 120Ω terminations for Star
Configurations, V
CC
≥
4.75V)
Change in Magnitude of Driver
Differential V
OUT
for
Complementary Output
States
Driver Differential V
OUT
with
Common Mode Load
(Figure
4B)
Driver Common Mode V
OUT
(Figure
4)
Change in Magnitude of Driver
Common Mode V
OUT
for
Complementary Output
States
Driver Short-circuit Current
V
OD
R
L
= 54Ω or 100Ω (Figure
4A)
V
OD3
R
L
= 60Ω, -7V
≤
V
CM
≤
12V
R
L
= 60Ω, -25V
≤
V
CM
≤
25V (V
CC
≥
4.75V)
R
L
= 21Ω, -15V
≤
V
CM
≤
15V (V
CC
≥
4.75V)
Full
Full
Full
Full
Full
Full
1.5
1.7
0.8
-1
-2.5
-
2.1
2.3
1.1
-
-
-
V
CC
-
3
5
0.2
V
V
V
V
V
V
V
OC
DV
OC
R
L
= 54Ω or 100Ω
R
L
= 60Ω or 100Ω, -20V
≤
V
CM
≤
20V
R
L
= 54Ω or 100Ω (Figure
4A)
I
OSD
I
OSD1
I
OSD2
DE = V
CC
, -25V
≤
V
O
≤
25V (Note
8)
At First fold-back, 22V
≤
V
O
≤
-22V
At Second fold-back, 35V
≤
V
O
≤
-35V
DE, DI, RE, INV, RINV, DINV
DE, DI, RE, INV, RINV, DINV
DI
DE, RE, INV, RINV, DINV
Full
Full
Full
Full
Full
Full
Full
-250
-83
-13
2.5
-
-1
-15
-
-
-
-
-
-
6
250
83
13
-
0.8
1
15
mA
mA
mA
V
V
µA
µA
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Current
V
IH
V
IL
I
IN1
FN7785 Rev 3.00
May 13, 2015
Page 5 of 17
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