DATASHEET
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Fault Protected, Extended Common Mode Range, RS-485/RS-422 Transceivers
The ISL31470E, ISL31472E, ISL31475E, ISL31478E
are fault protected, extended common mode range
differential transceivers that exceed the RS-485 and
RS-422 standards for balanced communication. The
RS-485 bus pins (driver outputs and receiver inputs)
are protected against overvoltages up to ±60V.
Additionally, these transceivers operate in
environments with common mode voltages up to
±15V (exceeds the RS-485 requirement), making
this RS-485 family one of the more 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 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. Rx outputs feature high drive levels -
typically 15mA @ V
OL
= 1V (to ease the design of
opto-coupled isolated interfaces).
Half duplex (Rx inputs and Tx outputs multiplexed
together) and full duplex pinouts are available. See
Table 1 on page 2 for key features and configurations
by device number.
For an RS-485 family with a ±25V extended common
mode range, please see the
ISL31490E
and
ISL31480E
data sheets.
FN7639
Rev 1.00
September 3, 2015
Features
• Fault Protected RS-485 Bus Pinsup to ±60V
• Extended Common Mode Range±15V
Larger Than Required for RS-485
• 1/4 Unit Load for up to 128 Devices on the Bus
• High Transient Over Voltage Tolerance±80V
• Full Fail-safe (Open, Short, Terminated) RS-485
Receivers
• 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
• Choice of RS-485 Data Rates250kbps to 15Mbps
• Low Quiescent Supply Current 2.3mA
Ultra Low Shutdown Supply Current 10µA
• Pb-Free (RoHS Compliant)
Applications
• Utility Meters/Automated Meter Reading Systems
• High Node Count Systems
• PROFIBUS™ and Field Bus Networks, and Factory
Automation
• Security Camera Networks
• Building Lighting and Environmental Control
Systems
• Industrial/Process Control Networks
Exceptional Rx Operates at
>15Mbps Even with ±15V
Common Mode Voltage
20
B
A
VID = ±1V
Transceivers Deliver Superior
Common Mode Range vs
Standard RS-485 Devices
15
12
COMMON MODE RANGE
15
VOLTAGE (V)
10
0
5
RO
-7
0
-15
-5
TIME (20ns/DIV)
STANDARD RS-485
TRANSCEIVER
ISL3147xE
FN7639 Rev 1.00
September 3, 2015
Page 1 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
TABLE 1. SUMMARY OF FEATURES
PART NUMBER
ISL31470E
ISL31472E
ISL31475E
ISL31478E
HALF/FULL
DUPLEX
Full
Half
Half
Half
DATA RATE
(Mbps)
0.25
0.25
1
15
SLEW-RATE
LIMITED?
Yes
Yes
Yes
No
EN
PINS?
Yes
Yes
Yes
Yes
HOT
PLUG?
Yes
Yes
Yes
Yes
QUIESCENT
I
CC
(mA)
2.3
2.3
2.3
2.3
LOW POWER
SHDN?
Yes
Yes
Yes
Yes
PIN
COUNT
14
8
8
8
Ordering Information
PART NUMBER
(Note 3)
ISL31470EIBZ (Note 1)
ISL31472EIBZ (Note 1)
ISL31472EIPZ (Note 2)
(No longer
available, recommended
replacement:ISL32472EIBZ)
ISL31475EIBZ (Note 1)
ISL31478EIBZ (Note 1)
NOTES:
1. Add “-T” suffix for tape and reel. Please refer to
TB347
for details on reel specifications.
2. Pb-free PDIPs can be used for through-hole wave solder processing only. They are not intended for use in Reflow solder
processing applications.
3. 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.
4. For Moisture Sensitivity Level (MSL), please see device information pages for
ISL31470E, ISL31472E, ISL31475E, ISL31478E.
For more information on MSL please see techbrief
TB363.
PART
MARKING
ISL31470 EIBZ
31472 EIBZ
31472 EIPZ
TEMP. RANGE
(°C)
-40 to +85
-40 to +85
-40 to +85
PACKAGE
(Pb-Free)
14 Ld SOIC
8 Ld SOIC
8 Ld PDIP
PKG.
DWG. #
M14.15
M8.15
E8.3
31475 EIBZ
31478 EIBZ
-40 to +85
-40 to +85
8 Ld SOIC
8 Ld SOIC
M8.15
M8.15
Pin Configurations
ISL31472E, ISL31475E, ISL31478E
(8 LD SOIC, 8 LD PDIP)
TOP VIEW
RO 1
RE 2
DE 3
DI 4
D
R
8 V
CC
7 B/Z
6 A/Y
5 GND
ISL31470E
(14 LD SOIC)
TOP VIEW
NC 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 NC
FN7639 Rev 1.00
September 3, 2015
Page 2 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Truth Tables
TRANSMITTING
INPUTS
RE
X
X
0
1
DE
1
1
0
0
DI
1
0
X
X
Z
0
1
High-Z
High-Z*
OUTPUTS
Y
1
0
High-Z
High-Z*
0
0
0
1
1
RE
DE
Half Duplex
0
0
0
0
1
RECEIVING
INPUTS
DE
Full Duplex
X
X
X
0
1
A-B
-0.01V
-0.2V
Inputs
Open/Shorted
X
X
OUTPUT
RO
1
0
1
High-Z*
High-Z
NOTE: *Low Power Shutdown Mode (see Note 13, page 9).
NOTE: *Low Power Shutdown Mode (see Note 13, page 9).
Pin Descriptions
PIN
8 LD 14 LD
NAME PIN # PIN #
RO
RE
DE
DI
GND
A/Y
B/Z
A
B
Y
Z
V
CC
NC
1
2
3
4
5
6
7
-
-
-
-
8
-
2
3
4
5
6, 7
-
-
12
11
9
10
FUNCTION
Receiver output: If A-B
-10mV, RO is high; If A-B
-200mV, RO is low; RO = High if A and B are
unconnected (floating), shorted together, or connected to an undriven, terminated bus.
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. They are high
impedance when DE is low. Internally pulled high.
Driver input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y
high and output Z low.
Ground connection.
±60V Fault Protected, RS-485/RS-422 level, non-inverting receiver input and 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, inverting receiver input and 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, non-inverting receiver input.
±60V Fault Protected, RS-485/RS-422 level, inverting receiver input.
±60V Fault Protected, RS-485/RS-422 level, non-inverting driver output.
±60V Fault Protected, RS-485/RS-422 level, inverting driver output.
13, 14 System power supply input (4.5V to 5.5V).
1, 8
No Internal Connection.
FN7639 Rev 1.00
September 3, 2015
Page 3 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Typical Operating Circuits
ISL31472E, ISL31475E, ISL31478E
+5V
8
1 RO
2 RE
3 DE
4 DI
D
GND
5
GND
5
V
CC
R
B/Z 7
A/Y 6
R
T
R
T
7
6
B/Z
A/Y
R
+
0.1µF
+
0.1µF
+5V
8
V
CC
D
DI 4
DE 3
RE 2
RO 1
ISL31470E
+5V
13, 14
V
CC
2 RO
3 RE
4 DE
5 DI
Z 10
D
GND
6, 7
Y 9
R
T
11 B
12 A
GND
6, 7
R
R
+
0.1µF
A 12
B 11
R
T
+
0.1µF
+5V
13, 14
9 Y V
CC
10 Z
D
DI 5
DE 4
RE 3
RO 2
FN7639 Rev 1.00
September 3, 2015
Page 4 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Absolute Maximum Ratings
V
CC
to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, 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 100, Note 17). . . . . . . . ±80V
RO . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (V
CC
+0.3V)
Short Circuit Duration
Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
ESD Rating . . . . . . . . . . . . . . . . . . . see Specification Table
Latch-up (per JESD78, Level 2, Class A) . . . . . . . . . +125°C
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
8 Ld PDIP* Package (Notes 5, 7) . . .
105
60
8 Ld SOIC Package (Notes 6, 7). . . .
116
47
14 Ld SOIC Package (Notes 6, 7) . . .
88
39
Maximum Junction Temperature (Plastic Package). . . . .+150°C
Maximum Storage Temperature Range. . . . . -65°C to +150°C
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
*Pb-free PDIPs can be used for through-hole wave solder
processing only. They are not intended for use in Reflow
solder processing applications.
Recommended Operating Conditions
Supply Voltage (V
CC
) . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Temperature Range . . . . . . . . . . . . . . . . . . -40°C to +85°C
Bus Pin Common Mode Voltage Range . . . . . . -15V to +15V
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:
5.
JA
is measured with the component mounted on a low effective thermal conductivity test board in free air.
6.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief
TB379 for details.
7. For
JC
, the “case temp” location is taken at the package top center.
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 8).
Boldface limits apply over the operating temperature range,
-40°C to +85°C.
TEST CONDITIONS
TEMP
MIN
MAX
(°C) (Note 16) TYP (Note 16) UNITS
PARAMETER
DC CHARACTERISTICS
Driver Differential V
OUT
(No load)
Driver Differential V
OUT
(Loaded, Figure 1A)
SYMBOL
V
OD1
V
OD2
R
L
= 100Ω (RS-422)
R
L
= 54Ω (RS-485)
R
L
= 54Ω (PROFIBUS, V
CC
≥
5V)
R
L
= 21Ω (Six 120Ω terminations for
Star Configurations, V
CC
≥
4.75V)
Full
Full
Full
Full
Full
Full
-
2.4
1.5
2.0
0.8
-
-
3.2
2.5
2.5
1.3
-
V
CC
-
V
CC
-
-
0.2
V
V
V
V
V
Change in Magnitude of Driver
Differential V
OUT
for
Complementary Output States
Driver Differential V
OUT
with
Common Mode Load
(Figure 1B)
Driver Common-Mode V
OUT
(Figure 1A)
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 1A)
V
OD3
R
L
= 60Ω, -7V
≤
V
CM
≤
12V
R
L
= 60Ω, -15V
≤
V
CM
≤
15V
(V
CC
≥
4.75V)
Full
Full
Full
Full
1.5
1.7
-1
-
2.1
2.3
-
-
V
CC
-
3
0.2
V
v
V
V
V
OC
V
OC
R
L
= 54Ω or 100Ω
R
L
= 54Ω or 100Ω (Figure 1A)
I
OSD
I
OSD1
I
OSD2
DE = V
CC
, -15V
≤
V
O
≤
15V (Note 10)
At First Fold-back, 22V
≤
V
O
≤
-22V
At Second Fold-back, 35V
≤
V
O
≤
-35V
Full
Full
Full
-250
-83
-13
-
-
-
250
83
13
mA
mA
mA
FN7639 Rev 1.00
September 3, 2015
Page 5 of 21
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