
1
FN6085.6
ISL83080E, ISL83082E, ISL83083E,
ISL83085E, ISL83086E, ISL83088E
±15kV ESD Protected, 5V, Full Fail-Safe, 
Fractional (1/8) Unit Load, RS-485/RS-422 
Transceivers
The ISL8308XE are BiCMOS, ESD protected, 5V powered, 
single transceivers that meet both the RS-485 and RS-422 
standards for balanced communication. Each driver output, 
and receiver input, is protected against 
±
15kV ESD strikes 
without latch-up, and unlike competitive products, this Intersil 
family is specified for 10% tolerance supplies (4.5V to 5.5V).
These devices have very low bus currents (+125
μ
A/-75
μ
A), 
so they present a true “1/8 unit load” to the RS-485 bus. This 
allows up to 256 transceivers on the network without violating 
the RS-485 specification’s 32 unit load maximum, and without 
using repeaters. For example, in a remote utility meter reading 
system, individual meter readings are routed to a concentrator 
via an RS-485 network, so the high allowed node count 
minimizes the number of repeaters required. Data for all 
meters is then read out from the concentrator via a single 
access port, or a wireless link.
Receiver (Rx) inputs feature a “Full Fail-Safe” design, which 
ensures a logic high Rx output if Rx inputs are floating, 
shorted, or terminated but undriven.
The ISL83080E, ISL83082E, ISL83083E, ISL83085E utilize 
slew rate limited drivers which reduce EMI, and minimize 
reflections from improperly terminated transmission lines, or 
unterminated stubs in multidrop and multipoint applications. 
Slew rate limited versions also include receiver input filtering to 
enhance noise immunity in the presence of slow input signals.
Hot Plug circuitry ensures that the Tx and Rx outputs remain 
in a high impedance state until the power supply has 
stabilized, and the Tx outputs are fully short circuit protected.
The ISL83080E, ISL83083E, ISL83086E are configured for 
full duplex (separate Rx input and Tx output pins) 
applications. The half duplex versions multiplex the Rx inputs 
and Tx outputs to allow transceivers with output disable 
functions in 8 lead packages.
Features
 Pb-Free Plus Anneal Available (RoHS Compliant)
(See Ordering Info)
 RS-485 I/O Pin ESD Protection  . . . . . . . . . .  
±
15kV HBM 
Class 3 ESD Protection (HBM) on all Pins. . . . . . . .  >7kV
 Full Fail-safe (Open, Short, Terminated and Floating) 
Receivers
 Hot Plug Circuitry (ISL83080E, ISL83082E, ISL83083E, 
ISL83085E)
- Tx and Rx Outputs Remain Three-state During Power-
up/Power-down
 True 1/8 Unit Load Allows up to 256 Devices on the Bus
 Specified for Single 5V, 10% Tolerance, Supplies
 High Data Rates. . . . . . . . . . . . . . . . . . . . .  up to 10Mbps
 Low Quiescent Supply Current  . . . . . . . . . . . . . . .  530
μ
A
Ultra Low Shutdown Supply Current . . . . . . . . . . . .  70nA
 -7V to +12V Common Mode Input Voltage Range
 Half and Full Duplex Pinouts
 Three-State Rx and Tx Outputs
 Current Limiting and Thermal Shutdown for driver 
Overload Protection
Applications
 Automated Utility Meter Reading Systems
 High Node Count Systems
 Factory Automation
 Field Bus Networks
 Security Camera Networks
 Building Environmental Control Systems
 Industrial/Process Control Networks
TABLE 1.  SUMMARY OF FEATURES
PART 
NUMBER
HALF/FULL 
DUPLEX
DATA RATE 
(Mbps)
SLEW-RATE 
LIMITED
HOT PLUG
# DEVICES 
ON BUS
Rx/Tx 
ENABLE
QUIESCENT 
I
CC
 (
μ
A)
LOW POWER 
SHUTDOWN
PIN 
COUNT
ISL83080E
Full
0.115
Yes
Yes
256
Yes
530
Yes
14
ISL83082E
Half
0.115
Yes
Yes
256
Yes
530
Yes
8
ISL83083E
Full
0.5
Yes
Yes
256
Yes
530
Yes
14
ISL83085E
Half
0.5
Yes
Yes
256
Yes
530
Yes
8
ISL83086E
Full
10
No
No
256
Yes
530
Yes
14
ISL83088E
Half
10
No
No
256
Yes
530
Yes
8
Data Sheet
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
 Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright  Intersil Americas Inc. 2004-2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
September 12, 2005