DATASHEET
ISL32483E, ISL32485E
Fault Protected, Extended CMR, RS-485/RS-422 Transceivers with Cable Invert
and ±16.5kV ESD
FN7785
Rev.4.00
Feb 15, 2019
The ISL32483E and ISL32485E (ISL3248xE) are fault protected,
Features
5V powered differential transceivers that exceed the RS-485 and
• Fault protected RS-485 bus pins . . . . . . . . . . . . . . up to ±60V
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.
• 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
The 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.
• High Rx I for opto-couplers in isolated designs
OL
• Hot plug circuitry: Tx and Rx outputs remain three-state
during power-up/power-down
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.
• Slew rate limited RS-485 data rate . . . . . . . . . . . . . . . 1Mbps
• Low quiescent supply current. . . . . . . . . . . . . . . . . . . . 2.3mA
• Ultra low shutdown supply current. . . . . . . . . . . . . . . . . . 10µA
The ISL32483E and ISL32485E include cable invert functions
that reverse the polarity of the Rx and/or Tx bus pins if the
cable is misconnected. Unlike competing devices, the Rx full
fail-safe operation is maintained even when the Rx input
polarity is switched.
Applications
• Utility meters/automated meter reading systems
• High node count RS-485 systems
For fault protected RS-485 transceivers without the cable
invert function, see the ISL32470E and ISL32490E
datasheets.
• PROFIBUS™ and RS-485 based field bus networks and
factory automation
• Security camera networks
• Building lighting and environmental control systems
• Industrial/process control networks
Related Literature
For a full list of related documents, visit our website:
• ISL32483E, ISL32485E device pages
30
25
VID = ±1V
B
25
A
12
0
20
15
10
-7
-12
5
RO
0
-20
-25
-5
STANDARD RS-485
TRANSCEIVER
CLOSEST
COMPETITOR
ISL3248xE
TIME (400ns/DIV)
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.4.00
Feb 15, 2019
Page 1 of 18
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