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ISL32485EIBZ Datasheet(PDF) 1 Page - Intersil Corporation

No. de pieza ISL32485EIBZ
Descripción Electrónicos  Fault Protected, Extended CMR, RS-485/RS-422 Transceivers
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL32485EIBZ Datasheet(HTML) 1 Page - Intersil Corporation

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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 54Ω load. This yields
better noise immunity than standard RS-485 ICs or allows up to
six 120Ω terminations in star network topologies.
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.
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
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
-5
0
5
10
15
20
25
30
TIME (400ns/DIV)
B
VID = ±1V
A
RO
ISL3248XE
CLOSEST
COMPETITOR
STANDARD RS-485
TRANSCEIVER
-25
-20
-12
-7
0
12
25
January 18, 2011
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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