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SP4082E Datasheet, PDF (1/14 Pages) Exar Corporation – 5V RS-485/RS-422 Transceivers 1/8th Unit Load, Slew-Rate Limited, ±15kV ESD-Protected | |||
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SP4082E
5V RS-485/RS-422 Transceivers
1/8th Unit Load, Slew-Rate Limited, ±15kV ESD-Protected
FEATURES
⢠5.0V single supply operation
⢠Receiver failsafe on open or shorted lines
⢠1/8th Unit Load, 256 transceivers on bus
⢠Robust ESD protection for RS-485 pins
±15kV Human Body Model
⢠Controlled driver slew rates
115kbps, Low EMI
â¢Driver short circuit current limit and
thermal shutdown for overload protection
â¢Industry standard package footprints
RO 1
RE 2
DE 3
DI 4
8 PIN NSOIC
SP4082E
Half Duplex
8 Vcc
7B
6A
5 GND
APPLICATIONS
⢠Motor Control
⢠Building Automation
⢠Security Systems
⢠Remote Meter Reading
⢠Long or un-terminated transmission lines
DESCRIPTION
The SP4082E is designed for reliable, bidirectional communication on multipoint bus transmission
lines. The device contains one differential driver and one differential receiver. It is a half-duplex de-
vice. The device complys with TIA/EIA-485 and TIA/EIA-422 standards. Lead-free and RoHS compli-
ant packages are available.
This device is ruggedized for use in harsh operating conditions over the entire common-mode volt-
age range from -7V to +12V. Receivers are specially designed to fail-safe to a logic high output state
if the inputs are un-driven or shorted. All RS-485 bus-pins are protected against severe ESD events
up to ±15kV (Human Body Model). Drivers are protected from excess current flow caused by bus
contention or output short-circuits by both an internal current limit and a thermal-overload shutdown.
Devices are rated for industrial (-40 to +85ºC) operating temperatures. Receivers have exceptionally
high input impedance, which places only 1/8th the standard load on a shared bus. Up to 256 trans-
ceivers may coexist while preserving full signal margin.
The device operates from a single 5.0V power supply and draws negligible quiescent power. The
device has an independent enable and disable for the driver and receiver and will enter a low power
shutdown mode if both driver and receiver are disabled. All outputs maintain high impedance during
shutdown or when powered-off.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 ⢠(510)6687000 ⢠Fax (510)668-7017 ⢠www.exar.com
SP4082E_100_122007
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