FN6085 Datasheet, PDF (1/19 Pages) Intersil Corporation – ±15kV ESD, 5V, Full Fail-Safe, 1/8 Unit Load, RS-485/RS-422 Transceivers

ISL83080E, ISL83082E, ISL83083E, ISL83084E,
®
ISL83085E, ISL83086E, ISL83088E
Data Sheet
April 22, 2008
FN6085.9
±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 (+125µA/-75µA),
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 . . . . . . . . . . . . . . . 530µA
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
PART
NUMBER
ISL83080E
ISL83082E
ISL83083E
ISL83084E
ISL83085E
ISL83086E
ISL83088E
TABLE 1. SUMMARY OF FEATURES
HALF/FULL DATA RATE SLEW-RATE
# DEVICES
Rx/Tx
DUPLEX
(Mbps)
LIMITED? HOT PLUG ON BUS ENABLE?
Full
0.115
Yes
Yes
256
Yes
Half
0.115
Yes
Yes
256
Yes
Full
0.5
Yes
Yes
256
Yes
Full
0.5
Yes
No
256
No
Half
0.5
Yes
Yes
256
Yes
Full
10
No
No
256
Yes
Half
10
No
No
256
Yes
QUIESCENT
I_CC (µA)
530
530
530
530
530
530
530
LOW POWER PIN
SHUTDOWN? COUNT
Yes
10, 14
Yes
8
Yes
10, 14
No
8
Yes
8
Yes
10, 14
Yes
8
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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