XR33032 Datasheet, PDF (1/19 Pages) Exar Corporation – WIDE SUPPLY 18V TOLERANT RS-485/RS-422 TRANSCEIVERS

XR33032/35/38
WIDE SUPPLY 18V TOLERANT RS-485/RS-422 TRANSCEIVERS
FEBRUARY 2014
REV. 1.0.0
GENERAL DESCRIPTION
FEATURES
The XR33032/35/38 family of high performance half
duplex RS-485 transceivers are optimized to operate
over a wide range of supply voltage, from +2.8V to
+5.5V. The analog bus pins can withstand direct shorts
up to ±18V, and are protected against ESD events up
to ±15kV.
In an isolated application it may be more efficient to
use a remote power supply rather than generating an
isolated supply at every node. The XR33032/35/38
transceivers can operate with more than 2V IR drop in
the cable when utilizing a remote 5V power supply.
The transceivers draw less than 600µA, and typically
only 300µA when idling with the receivers active.
The receivers include full fail-safe circuitry, guarantee-
ing a logic-high receiver output when the receiver
inputs are open, shorted, or undriven. The receiver
input impedance is 96k (1/8 unit load), allowing up to
256 devices on the bus while preserving the full signal
margin.
 +2.8V to +5.5V Operating Range
 ±18V Fault Tolerance on Analog Bus pins
 Robust ESD (ElectroStatic Discharge) Protection:
■ ±15kV IEC 61000-4-2 Air Gap Discharge
■ ± 8kV IEC 61000-4-2 Contact Discharge
■ ±15kV Human Body Model
■ ± 4kV Human Body Model on non-bus pins
 300µA Idle Current, 40nA Shutdown Current
 Enhanced Receiver Fail-Safe Protection for Open,
Shorted, or Terminated but Idle Data Lines
 Hot-Swap Glitch Protection on DE and RE Pins
 Driver Short Circuit Current Limit and Thermal
Shutdown for Overload Protection
 1/8^th Unit Load Allows up to 256 Devices on Bus
 Industry Standard 8 NSOIC Half Duplex Package
The drivers are protected by short circuit detection as
well as thermal shutdown, and maintain high imped-
ance in shutdown or when powered off. The XR33032
and XR33035 drivers are slew limited for reduced EMI
and error-free communication over long or untermi-
nated data cables.
The DE and RE pins include hot swap circuitry to pre-
vent false transitions on the bus during power-up or
live insertion, and can enter a low current shutdown
mode (40nA typically) for extreme power savings.
TYPICAL APPLICATIONS
 Isolated Multipoint RS-485 Data Buses
 Remote Nodes Powered by the Host
 Building Automation and HVAC
 Industrial Process Control Networks
 Remote Utility Meter Reading
 Energy Monitoring and Control
RO ¹
R
8 _VCC
RE ²
7 _B/Z
DE ³
6 _A/Y
DI ⁴
D
5 _GND
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • [phone] • FAX [phone] • www.exar.com