DATASHEET
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E
±60V Fault Protected, 3.3V to 5V, ±20V Common-Mode Range, RS-485/RS-422
Transceivers with Cable Invert and ±15kV ESD
The ISL3245xE are 3.3V to 5V powered, fault protected,
extended Common-Mode Range (CMR) differential
transceivers for balanced communication. The RS-485 bus
pins (driver outputs and receiver inputs) are protected against
overvoltages up to ±60V, and against ±15kV ESD strikes.
These transceivers operate in environments with common-
mode voltages up to ±20V (exceeds the RS-485 requirement),
making this RS-485 family one of the more robust on the
market.
Transmitters are RS-485 compliant with V
CC
≥
4.5V and
deliver a 1.1V differential output voltage into the RS-485
specified 54Ω load even with V
CC
= 3V. 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 full fail-safe operation is maintained even
when the Rx input polarity is switched (cable invert function on
ISL32457E and ISL32459E).
The ISL32457E and ISL32459E include a cable invert function
that reverses the polarity of the Rx and Tx bus pins in case the
cable is misconnected during installation.
See
Table 1 on page 2
for key features and configurations by
device number.
FN7921
Rev.2.00
Aug 31, 2017
Features
• Fault protected RS-485 bus pins . . . . . . . . . . . . . . up to ±60V
• Extended common-mode range . . . . . . . . . . . . . . . . . . . ±20V
larger than required for RS-485
• ±15kV HBM ESD protection on RS-485 bus pins
• Wide supply range . . . . . . . . . . . . . . . . . . . . . . . . . . 3V to 5.5V
• Cable invert pin (ISL32457E and ISL32459E only)
corrects for reversed cable connections while maintaining
Rx full fail-safe functionality
• 1/4 unit load for up to 128 devices on the bus
• High transient overvoltage tolerance. . . . . . . . . . . . . . . . ±80V
• Full fail-safe (open, short, terminated) RS-485 receivers
• Choice of RS-485 data rates . . . . . . . . . . . . . . . . . . up to 20Mbps
• Low quiescent supply current . . . . . . . . . . . . . . . . . . . . . 2.1mA
Applications
• Utility meters and automated meter reading systems
• Air conditioning systems
• Security camera networks
• Building lighting and environmental control systems
• Industrial and process control networks
Related Literature
•
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E
,
ISL32458E
, and
ISL32459E
product pages
20
B
VOLTAGE (V)
15
10
5
RO
0
VID = ±1V
2Mbps
COMMON-MODE RANGE (V)
A
V
CC
= 3V
20
12
0
-7
-20
TIME (200ns/ DIV)
STANDARD RS-485
TRANSCEIVER
ISL3245XE
FIGURE 1. EXCEPTIONAL ISL32453E RX OPERATES AT >1Mbps
EVEN WITH ±20V COMMON-MODE VOLTAGE
FIGURE 2. TRANSCEIVERS DELIVER SUPERIOR COMMON-MODE
RANGE vs STANDARD RS-485 DEVICES
FN7921 Rev.2.00
Aug 31, 2017
Page 1 of 23
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ISL32450E
ISL32452E
ISL32453E
ISL32455E
ISL32457E
ISL32458E
ISL32459E
HALF/FULL
DUPLEX
Full
Half
Full
Half
Half
Half
Half
DATA RATE
(Mbps)
0.25
0.25
1
1
0.25
20
20
SLEW-RATE
LIMITED?
Yes
Yes
Yes
Yes
Yes
No
No
EN
PINS?
Yes
Yes
Yes
Yes
Tx Only
Yes
Tx Only
HOT
PLUG
No
No
No
No
No
No
No
CABLE INVERT
(INV) PIN?
No
No
No
No
Yes
No
Yes
QUIESCENT I
CC
(mA)
2.1
2.1
2.1
2.1
2.1
2.1
2.1
LOW POWER
SHDN?
Yes
Yes
Yes
Yes
No
Yes
No
PIN COUNT
10, 14
8
10, 14
8
8
8
8
Ordering Information
PART NUMBER
(Notes
1, 2, 3)
ISL32450EIBZ
ISL32450EIUZ
ISL32452EIBZ
ISL32452EIUZ
ISL32453EIBZ
ISL32453EIUZ
ISL32455EIBZ
ISL32455EIUZ
ISL32457EIBZ
ISL32457EIUZ
ISL32458EIBZ
ISL32459EIBZ
PART
MARKING
ISL32450 EIBZ
2450E
32452 EIBZ
2452E
ISL32453 EIBZ
2453E
32455 EIBZ
2455E
32457 EIBZ
2457E
32458 EIBZ
32459 EIBZ
TEMP. RANGE
(°C)
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
PACKAGE
(RoHS Compliant)
14 Ld SOIC
10 Ld MSOP
8 Ld SOIC
8 Ld MSOP
14 Ld SOIC
10 Ld MSOP
8 Ld SOIC
8 Ld MSOP
8 Ld SOIC
8 Ld MSOP
8 Ld SOIC
8 Ld SOIC
PKG.
DWG. #
M14.15
M10.118
M8.15
M8.118
M14.15
M10.118
M8.15
M8.118
M8.15
M8.118
M8.15
M8.15
NOTES:
1. Add “-T” suffix for 2.5k unit or “-T7A” suffix for 250 unit tape and reel options. 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), see the product information pages for
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E,
ISL32459E.
For more information on MSL, refer to
TB363.
FN7921 Rev.2.00
Aug 31, 2017
Page 2 of 23
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E
Pin Configurations
ISL32450E, ISL32453E
(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 NC
12 A
11 B
10 Z
9 Y
8 NC
ISL32450E, ISL32453E
(10 LD MSOP)
TOP VIEW
RO 1
RE 2
DE 3
DI 4
GND 5
D
R
10 V
CC
9 A
8 B
7 Z
6 Y
ISL32452E, ISL32455E, ISL32458E
(8 LD SOIC, 8 LD MSOP)
TOP VIEW
RO 1
RE 2
DE 3
DI 4
D
8
7
V
CC
B/Z
ISL32457E, ISL32459E
(8 LD SOIC, 8 LD MSOP)
TOP VIEW
RO 1
INV 2
DE 3
DI 4
D
8
7
V
CC
B/Z
R
R
6 A/Y
5
GND
6 A/Y
5
GND
NOTE: Evaluate creepage and clearance requirements at your maximum fault voltage before using small pitch packages, such as MSOP.
Truth Tables
TRANSMITTING
INPUTS
RE
X
X
X
X
0
1
NOTES:
4. Parts without the INV pin follow the rows with INV = “0” and “X”.
5. Low Power Shutdown mode (see
Notes 14
and
19).
DE
1
1
1
1
0
0
DI
1
0
1
0
X
X
INV (Note
4)
0
0
1
1
X
X
Y
1
0
0
1
High-Z
High-Z
(Note
5)
OUTPUTS
Z
0
1
1
0
High-Z
High-Z
(Note
5)
RE
(Note
19)
0
0
0
0
0
0
0
RECEIVING
INPUTS
DE
DE
Half
Full
Duplex Duplex
0
0
0
0
0
0
0
X
X
X
X
X
X
X
A-B
INV
(Note
4)
0
0
0
1
1
1
X
OUTPUT
RO
V
AB
≥
-0.01V
-0.01V > V
AB
> -0.2V
V
AB
≤
-0.2V
V
AB
≤
0.01V
0.01V < V
AB
< 0.2V
≥
0.2V
Inputs
Open or
Shorted
X
X
1
Undetermined
0
1
Undetermined
0
1
1
1
0
1
0
1
X
X
High-Z
(Note
5)
High-Z
FN7921 Rev.2.00
Aug 31, 2017
Page 3 of 23
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E
Pin Descriptions
ISL32450E,
ISL32450E,
ISL32453E,
ISL32453E,
(14 LD SOIC) (10 LD MSOP)
PIN #
PIN #
2
1
ISL32452E,
ISL32455E,
ISL32458E
(8 LD SOIC,
8 LD MSOP)
PIN #
1
ISL32457E,
ISL32459E
(8 LD SOIC,
8 LD MSOP)
PIN #
1
PIN
NAME
RO
FUNCTION
Receiver output. For parts without the cable invert function - or if INV is low -
then: If A - B
≥
-10mV, RO is high; if A - B
≤
-200mV, RO is low. If INV 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 (that is, 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.
Driver input. For parts without the cable invert function - or if INV 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 is high.
Ground connection.
±60V fault protected and ±16.5kV ESD protected RS-485/RS-422 I/O pin. For
parts without the cable invert function - or if INV is low - A/Y is the noninverting
receiver input and noninverting 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 and ±16.5kV ESD protected RS-485/RS-422 I/O pin. For
parts without the cable invert function - or if INV is low - B/Z is the inverting
receiver input and inverting driver output. If INV is high, 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 protected and ±15kV ESD protected RS-485/RS-422 noninverting
receiver input.
±60V fault protected and ±15kV ESD protected RS-485/RS-422 inverting
receiver input.
±60V fault protected and ±15kV ESD protected RS-485/RS-422 noninverting
driver output.
±60V fault protected and ±15kV ESD protected RS-485/RS-422 inverting
driver output.
System power supply input (3V to 5.5V).
Receiver and driver cable invert (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.
No internal connection.
RE
DE
DI
3
4
5
2
3
4
2
3
4
N/A
3
4
GND
A/Y
6, 7
N/A
5
N/A
5
6
5
6
B/Z
N/A
N/A
7
7
A
B
Y
Z
V
CC
INV
12
11
9
10
14
N/A
9
8
6
7
10
N/A
N/A
N/A
N/A
N/A
8
N/A
N/A
N/A
N/A
N/A
8
2
NC
1, 8, 13
N/A
N/A
N/A
FN7921 Rev.2.00
Aug 31, 2017
Page 4 of 23
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E
Typical Operating Circuits
+3.3V
+
14
V
CC
2 RO
3 RE
4 DE
5 DI
Z 10
D
Y 9
GND
6, 7
SOIC PINOUT SHOWN
R
T
11 B
12 A
R
GND
6, 7
R
A 12
B 11
0.1μF
R
T
0.1μF
+
14
9 Y V
CC
10 Z
D
DI 5
DE 4
RE 3
RO 2
+3.3V
FIGURE 3. ISL32450E, ISL32453E FULL DUPLEX NETWORK
+3.3V
8
V
CC
1 RO
2 RE
3 DE
4 DI
D
GND
5
R
B/Z
A/Y
7
6
R
T
R
T
7
B/Z
6 A/Y
+
0.1μF
0.1μF
+
+3.3V
8
V
CC
D
DI 4
DE 3
RE 2
R
GND
5
RO 1
FIGURE 4. ISL32452E, ISL32455E, ISL32458E HALF DUPLEX NETWORK
+3.3V
+
8
V
CC
R
0.1μF
0.1μF
+
+3.3V
8
V
CC
R
RO 1
2
INV
1 RO
A/Y
B/Z
6
7
R
T
R
T
7
6
B/Z
A/Y
3 DE
4 DI
D
GND
5
THE IC ON THE LEFT HAS THE CABLE CONNECTIONS
SWAPPED, SO THE INV PIN IS STRAPPED HIGH TO
INVERT THE RX AND TX POLARITY
GND
5
D
DE 3
DI 4
INV
2
FIGURE 5. ISL32457E, ISL32459E HALF DUPLEX NETWORK USING CABLE INVERT FUNCTION
FN7921 Rev.2.00
Aug 31, 2017
Page 5 of 23
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