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ISL32483E Datasheet, PDF (1/17 Pages) Intersil Corporation – Fault Protected, Extended CMR, RS-485/RS-422 Transceivers | |||
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Fault Protected, Extended CMR, RS-485/RS-422
Transceivers with Cable Invert and ±16.5kV ESD
ISL32483E, ISL32485E
The ISL3248xE are fault protected, 5V powered differential
transceivers that exceed the RS-485 and 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.
Transmitters (Tx) deliver an exceptional 2.5V (typical) differential
output voltage into the RS-485 specified 54⦠load. This yields
better noise immunity than standard RS-485 ICs or allows up to
six 120⦠terminations in star network topologies.
Receiver (Rx) inputs feature a âFull Fail-Safeâ design, which
ensures a logic high Rx output if Rx inputs are floating, shorted,
or on a terminated but undriven (idle) bus.
The ISL32483E and ISL32485E include cable invert functions
that reverse the polarity of the Rx and/or Tx bus pins in case the
cable is misconnected. Unlike competing devices, Rx full fail-safe
operation is maintained even when the Rx input polarity is
switched.
For fault protected RS-485 transceivers without the cable invert
function, please see the ISL32470E and ISL32490E data sheets.
Features
⢠Fault Protected RS-485 Bus Pins . . . . . . . . . . . . . . Up to ±60V
⢠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
⢠High Rx IOL for Opto-Couplers in Isolated Designs
⢠Hot Plug Circuitry: Tx and Rx Outputs Remain Three-State
During Power-up/Power-down
⢠Slew Rate Limited RS-485 Data Rate . . . . . . . . . . . . . 1Mbps
⢠Low Quiescent Supply Current . . . . . . . . . . . . . . . . . . . 2.3mA
⢠Ultra Low Shutdown Supply Current . . . . . . . . . . . . . . . 10µA
Applications
⢠Utility Meters/Automated Meter Reading Systems
⢠High Node Count RS-485 Systems
⢠PROFIBUS® and RS-485 Based Field Bus Networks, and
Factory Automation
⢠Security Camera Networks
⢠Building Lighting and Environmental Control Systems
⢠Industrial/Process Control Networks
30
B
25
A
20
VID = ±1V
15
10
5
RO
0
-5
TIME (400ns/DIV)
FIGURE 1. EXCEPTIONAL Rx OPERATES AT 1Mbps EVEN WITH
±25V COMMON MODE VOLTAGE
25
12
0
-7
-12
-20
-25
STANDARD RS-485
CLOSEST
TRANSCEIVER
COMPETITOR
ISL3248XE
FIGURE 2. TRANSCEIVERS DELIVER SUPERIOR COMMON MODE
RANGE vs STANDARD RS-485 DEVICES
January 18, 2011
1
FN7785.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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