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ISL83483, ISL83485, ISL83488,
ISL83490, ISL83491
Data Sheet
December 2003
FN6052.2
3.3V, Low Power, High Speed or Slew
Rate Limited, RS-485/RS-422 Transceivers
These Intersil RS-485/RS-422 devices are BiCMOS 3.3V
powered, single transceivers that meet both the RS-485 and
RS-422 standards for balanced communication. Unlike
competitive devices, this Intersil family is specified for 10%
tolerance supplies (3V to 3.6V).
The ISL83483 and ISL83488 utilize slew rate limited drivers
which reduce EMI, and minimize reflections from improperly
terminated transmission lines, or unterminated stubs in
multidrop and multipoint applications.
Data rates up to 10Mbps are achievable by using the
ISL83485, ISL83490, or ISL83491, which feature higher
slew rates.
Logic inputs (e.g., DI and DE) accept signals in excess of
5.5V, making them compatible with 5V logic families.
Receiver (Rx) inputs feature a 鈥渇ail-safe if open鈥?design,
which ensures a logic high output if Rx inputs are floating. All
devices present a 鈥渟ingle unit load鈥?to the RS-485 bus, which
allows up to 32 transceivers on the network.
Driver (Tx) outputs are short circuit protected, even for
voltages exceeding the power supply voltage. Additionally,
on-chip thermal shutdown circuitry disables the Tx outputs to
prevent damage if power dissipation becomes excessive.
The ISL83488, ISL83490, ISL83491 are configured for full
duplex (separate Rx input and Tx output pins) applications.
The ISL83488 and ISL83490 are offered in space saving 8
lead packages for applications not requiring Rx and Tx
output disable functions (e.g., point-to-point and RS-422).
Half duplex configurations (ISL83483, ISL83485) multiplex
the Rx inputs and Tx outputs to provide transceivers with Rx
and Tx disable functions in 8 lead packages.
Features
鈥?Operate from a Single +3.3V Supply (10% Tolerance)
鈥?Interoperable with 5V Logic
鈥?High Data Rates. . . . . . . . . . . . . . . . . . . . . up to 10Mbps
鈥?Single Unit Load Allows up to 32 Devices on the Bus
鈥?Slew Rate Limited Versions for Error Free Data
Transmission (ISL83483, ISL83488) . . . . . .up to 250kbps
鈥?Low Current Shutdown Mode (ISL83483, ISL83485,
ISL83491). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15nA
鈥?-7V to +12V Common Mode Input Voltage Range
鈥?Three State Rx and Tx Outputs (Except ISL83488,
ISL83490)
鈥?10ns Propagation Delay, 1ns Skew (ISL83485, ISL83490,
ISL83491)
鈥?Full Duplex and Half Duplex Pinouts
鈥?Current Limiting and Thermal Shutdown for driver
Overload Protection
Applications
鈥?Factory Automation
鈥?Security Networks
鈥?Building Environmental Control Systems
鈥?Industrial/Process Control Networks
鈥?Level Translators (e.g., RS-232 to RS-422)
鈥?RS-232 鈥淓xtension Cords鈥?/div>
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
ISL83483
ISL83485
ISL83488
ISL83490
ISL83491
HALF/FULL
DUPLEX
Half
Half
Full
Full
Full
DATA RATE
(Mbps)
0.25
10
0.25
10
10
SLEW-RATE
LIMITED?
Yes
No
Yes
No
No
RECEIVER/DRIVER
ENABLE?
Yes
Yes
No
No
Yes
QUIESCENT I
CC
(mA)
0.65
0.65
0.65
0.65
0.65
LOW POWER
SHUTDOWN?
Yes
Yes
No
No
Yes
PIN COUNT
8
8
8
8
14
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2003. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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