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
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E
,
ISL32458E
, and
ISL32459E
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 most
robust on the market.
The 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. The receiver (Rx) inputs
feature a full fail-safe design that ensures a logic-high Rx output
if the Rx inputs are floating, shorted, or on a terminated but
undriven (idle) bus. The 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 4
for key features and configurations by
device number.
FN7921
Rev.3.00
Feb 14, 2019
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
device 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.3.00
Feb 14, 2019
Page 1 of 25
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
6
B/Z
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
2
INV
1 RO
V
CC
R
R
T
0.1µF
0.1µF
+
+3.3V
8
V
CC
R
RO 1
A/Y
B/Z
6
7
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.3.00
Feb 14, 2019
Page 2 of 25
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E
Ordering Information
PART NUMBER
(Notes
2, 3)
ISL32450EIBZ
ISL32450EIBZ-T
ISL32450EIBZ-T7A
ISL32450EIUZ
ISL32450EIUZ-T
ISL32450EIUZ-T7A
ISL32452EIBZ
ISL32452EIBZ-T
ISL32452EIBZ-T7A
ISL32452EIUZ
ISL32452EIUZ-T
ISL32452EIUZ-T7A
ISL32453EIBZ
ISL32453EIBZ-T
ISL32453EIBZ-T7A
ISL32453EIUZ
ISL32453EIUZ-T
ISL32453EIUZ-T7A
ISL32455EIBZ
ISL32455EIBZ-T
ISL32455EIBZ-T7A
ISL32455EIUZ
ISL32455EIUZ-T
ISL32455EIUZ-T7A
ISL32457EIBZ
ISL32457EIBZ-T
ISL32457EIBZ-T7A
ISL32457EIUZ
ISL32457EIUZ-T
ISL32457EIUZ-T7A
ISL32458EIBZ
ISL32458EIBZ-T
ISL32458EIBZ-T7A
PART
MARKING
ISL32450 EIBZ
ISL32450 EIBZ
ISL32450 EIBZ
2450E
2450E
2450E
32452 EIBZ
32452 EIBZ
32452 EIBZ
2452E
2452E
2452E
ISL32453 EIBZ
ISL32453 EIBZ
ISL32453 EIBZ
2453E
2453E
2453E
32455 EIBZ
32455 EIBZ
32455 EIBZ
2455E
2455E
2455E
32457 EIBZ
32457 EIBZ
32457 EIBZ
2457E
2457E
2457E
32458 EIBZ
32458 EIBZ
32458 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
-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
-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
TAPE AND REEL
(Units) (Note
1)
-
2.5k
250
-
2.5k
250
-
2.5k
250
-
2.5k
250
-
2.5k
250
-
2.5k
250
-
2.5k
250
-
2.5k
250
-
2.5k
250
-
2.5k
250
-
2.5k
250
PACKAGE
(RoHS Compliant)
14 Ld SOIC
14 Ld SOIC
14 Ld SOIC
10 Ld MSOP
10 Ld MSOP
10 Ld MSOP
8 Ld SOIC
8 Ld SOIC
8 Ld SOIC
8 Ld MSOP
8 Ld MSOP
8 Ld MSOP
14 Ld SOIC
14 Ld SOIC
14 Ld SOIC
10 Ld MSOP
10 Ld MSOP
10 Ld MSOP
8 Ld SOIC
8 Ld SOIC
8 Ld SOIC
8 Ld MSOP
8 Ld MSOP
8 Ld MSOP
8 Ld SOIC
8 Ld SOIC
8 Ld SOIC
8 Ld MSOP
8 Ld MSOP
8 Ld MSOP
8 Ld SOIC
8 Ld SOIC
8 Ld SOIC
PKG.
DWG. #
M14.15
M14.15
M14.15
M10.118
M10.118
M10.118
M8.15
M8.15
M8.15
M8.118
M8.118
M8.118
M14.15
M14.15
M14.15
M10.118
M10.118
M10.118
M8.15
M8.15
M8.15
M8.118
M8.118
M8.118
M8.15
M8.15
M8.15
M8.118
M8.118
M8.118
M8.15
M8.15
M8.15
FN7921 Rev.3.00
Feb 14, 2019
Page 3 of 25
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E
Ordering Information
(Continued)
PART NUMBER
(Notes
2, 3)
ISL32459EIBZ
ISL32459EIBZ-T
ISL32459EIBZ-T7A
NOTES:
1. See
TB347
for details about reel specifications.
2. These 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). 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
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E
device pages. For
more information about MSL, see
TB363.
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? HOT PLUG
Yes
Yes
Yes
Yes
Tx Only
Yes
Tx Only
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
SHUTDOWN?
Yes
Yes
Yes
Yes
No
Yes
No
PIN COUNT
10, 14
8
10, 14
8
8
8
8
PART
MARKING
32459 EIBZ
32459 EIBZ
32459 EIBZ
TEMP. RANGE
(°C)
-40 to +85
-40 to +85
-40 to +85
TAPE AND REEL
(Units) (Note
1)
-
2.5k
250
PACKAGE
(RoHS Compliant)
8 Ld SOIC
8 Ld SOIC
8 Ld SOIC
PKG.
DWG. #
M8.15
M8.15
M8.15
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
6
5
V
CC
B/Z
A/Y
GND
ISL32457E, ISL32459E
(8 LD SOIC, 8 LD MSOP)
TOP VIEW
RO 1
INV 2
DE 3
DI 4
D
8
7
6
5
V
CC
B/Z
A/Y
GND
R
R
NOTE: Evaluate creepage and clearance requirements at your maximum fault voltage before using small pitch packages, such as MSOP.
FN7921 Rev.3.00
Feb 14, 2019
Page 4 of 25
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E
Pin Descriptions
ISL32452E,
ISL32455E,
ISL32458E
ISL32450E,
ISL32450E,
(8 LD SOIC,
ISL32453E,
ISL32453E,
(14 LD SOIC) (10 LD MSOP) 8 LD MSOP)
PIN #
PIN #
PIN #
2
1
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.3.00
Feb 14, 2019
Page 5 of 25
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