ISL83485IBZ-T Datasheet, PDF (1/17 Pages) Intersil Corporation – 3.3V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers

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Data Sheet
ISL83483, ISL83485, ISL83488,
ISL83490, ISL83491
August 2004
FN6052.3
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 “fail-safe if open” design,
which ensures a logic high output if Rx inputs are floating. All
devices present a “single unit load” 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
• Operate from a Single +3.3V Supply (10% Tolerance)
• Interoperable with 5V Logic
• High Data Rates. . . . . . . . . . . . . . . . . . . . . up to 10Mbps
• Single Unit Load Allows up to 32 Devices on the Bus
• Slew Rate Limited Versions for Error Free Data
Transmission (ISL83483, ISL83488) . . . . . .up to 250kbps
• Low Current Shutdown Mode (ISL83483, ISL83485,
ISL83491). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15nA
• -7V to +12V Common Mode Input Voltage Range
• Three State Rx and Tx Outputs (Except ISL83488,
ISL83490)
• 10ns Propagation Delay, 1ns Skew (ISL83485, ISL83490,
ISL83491)
• Full Duplex and Half Duplex Pinouts
• Current Limiting and Thermal Shutdown for driver
Overload Protection
• Pb-free available
Applications
• Factory Automation
• Security Networks
• Building Environmental Control Systems
• Industrial/Process Control Networks
• Level Translators (e.g., RS-232 to RS-422)
• RS-232 “Extension Cords”
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
TABLE 1. SUMMARY OF FEATURES
SLEW-RATE RECEIVER/DRIVER QUIESCENT I_CC
LIMITED?
ENABLE?
(mA)
Yes
Yes
0.65
No
Yes
0.65
Yes
No
0.65
No
No
0.65
No
Yes
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.
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