Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3080E-SP3088E_0_0826
DESCRIPTION
FEATURES
APPLICATIONS
SP3080E-3088E
Advanced-Failsafe RS-485/RS-422 Transceivers
/8th Unit Load, Slew-Rate Limited, ±5kV ESD-Protected
5.0V single supply operation
Receiver failsafe on open, shorted or terminated lines
/8th Unit Load, 256 transceivers on bus
Robust ESD protection for RS-485 pins
o ±5kV Air-Gap Discharge
o ±5kV Human Body Model
o ±8kV Contact Discharge
Controlled driver slew rates
o 5kbps, Low EMI (SP3080E, SP308E, SP3082E)
o 500kbps, Low EMI (SP3083E, SP3084E, SP3085E)
o High Speed, 20Mbps (SP3086E, SP3087E, SP3088E)
Hot Swap glitch protection on control inputs
Driver short circuit current limit and
thermal shutdown for overload protection
Ultra-low 400μA quiescent current
1μA shutdown mode (except SP3081E, SP3084E, SP3087E)
Industry standard package footprints
Motor Control
Building Automation
Security Systems
Remote Meter Reading
Long or un-terminated transmission lines
The SP3080E-SP3088E family of RS-485 devices are designed for reliable, bidirectional commu-
nication on multipoint bus transmission lines. Each device contains one differential driver and one
differential receiver. The SP3082E, SP3085E and SP3088E are half-duplex devices; other part num-
bers are full-duplex. All devices comply with TIA/EIA-485 and TIA/EIA-422 standards. Lead-free and
RoHS compliant packages are available for all models.
These devices are ruggedized for use in harsh operating conditions over the entire common-mode
voltage range from -7V to +2V. Receivers are specially designed to fail-safe to a logic high output
state if the inputs are left un-driven or shorted. All RS-485 bus-pins are protected against severe
ESD events up to ±5kV (Air-Gap and Human Body Model) and up to ±8kV Contact Discharge (IEC
61000-4-2). 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 in-
dustrial (-40 to +85C) operating temperatures. Receivers have exceptionally high input impedance,
which places only /8th the standard load on a shared bus. Up to 256 transceivers may coexist while
preserving full signal margin.
All devices operate from a single 5.0V power supply and draw negligible quiescent power. All ver-
sions except the SP308E, SP3084E, and SP3087E may independently enable and disable their
driver and receiver and enter a low power shutdown mode if both driver and receiver are disabled.
All outputs maintain high impedance in shutdown or when powered-off.
8 PIN NSOIC
SP3082E
SP3085E
SP3088E
Half Duplex
8 PIN NSOIC
SP308E
SP3084E
SP3087E
Full Duplex
2
3
4
5
6
7
8
5
6
7
8
2
3
4
4 PIN NSOIC
SP3080E
SP3083E
SP3086E
Full Duplex
2
3
4
5
6
7
8
9
0
2
3
4
NC
RO
RE
DE
DI
GND
Vcc
NC
A
B
Z
Y
NC
Vcc
RO
DI
GND
A
B
Z
Y
GND
A
B
Vcc
RO
RE
DE
DI