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FN6085.9
ISL83080E, ISL83082E, ISL83083E, ISL83084E,
ISL83085E, ISL83086E, ISL83088E
±15kV ESD, 5V, Full Fail-Safe, 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 (+125A/-75A),
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, ISL83084E,
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, ISL83084E, 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 Ld packages.
Features
Pb-Free Available (RoHS Compliant)
RS-485 I/O Pin ESD Protection . . . . . . . . . . ±15kV HBM
Class 3 ESD Protection (HBM) on all Pins. . . . . . . . >7kV
Tiny MSOP Packages Save 50% Board Space
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 . . . . . . . . . . . . . . . 530A
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 (Except ISL83084E)
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
ICC (A)
LOW POWER
SHUTDOWN?
PIN
COUNT
ISL83080E
Full
0.115
Yes
256
Yes
530
Yes
10, 14
ISL83082E
Half
0.115
Yes
256
Yes
530
Yes
8
ISL83083E
Full
0.5
Yes
256
Yes
530
Yes
10, 14
ISL83084E
Full
0.5
Yes
No
256
No
530
No
8
ISL83085E
Half
0.5
Yes
256
Yes
530
Yes
8
ISL83086E
Full
10
No
256
Yes
530
Yes
10, 14
ISL83088E
Half
10
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 1-888-468-3774
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2004-2005, 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
April 22, 2008
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