DATASHEET
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E, ISL32458E, ISL32459E
FN7921
Rev.2.00
Aug 31, 2017
±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,
Features
extended Common-Mode Range (CMR) differential
• Fault protected RS-485 bus pins . . . . . . . . . . . . . . up to ±60V
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.
• 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
Transmitters are RS-485 compliant with V ≥ 4.5V and
CC
deliver a 1.1V differential output voltage into the RS-485
specified 54Ω load even with V = 3V. Receiver (Rx) inputs
• 1/4 unit load for up to 128 devices on the bus
CC
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).
• 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
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.
Applications
• Utility meters and automated meter reading systems
See Table 1 on page 2 for key features and configurations by
device number.
• 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
12
V
= 3V
CC
A
B
20
15
10
5
VID = ±1V
2Mbps
0
-7
RO
0
-20
STANDARD RS-485
TRANSCEIVER
ISL3245XE
TIME (200ns/DIV)
FIGURE 2. TRANSCEIVERS DELIVER SUPERIOR COMMON-MODE
RANGE vs STANDARD RS-485 DEVICES
FIGURE 1. EXCEPTIONAL ISL32453E RX OPERATES AT >1Mbps
EVEN WITH ±20V COMMON-MODE VOLTAGE
FN7921 Rev.2.00
Aug 31, 2017
Page 1 of 23
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