ISL8483, ISL8485, ISL8488,
ISL8489, ISL8490, ISL8491
®
Data Sheet
February 28, 2006
FN6046.8
5V, Low Power, High Speed or Slew Rate
Limited, RS-485/RS-422 Trans ceivers
Features
• Specified for 10% Tolerance Supplies
The Intersil RS-485/RS-422 devices are BiCMOS 5V
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 (4.5V to 5.5V).
• Class 3 ESD Protection (HBM) on all Pins. . . . . . . . >7kV
• High Data Rates. . . . . . . . . . . . . . . . . . . . . . up to 5Mbps
• Slew Rate Limited Versions for Error Free Data
Transmission at 250kbps (ISL8483, ISL8488, ISL8489)
The ISL8483, ISL8488, and ISL8489 utilize slew rate limited
drivers which reduce EMI, and minimize reflections from
improperly terminated transmission lines, or unterminated
stubs in multidrop and multipoint applications.
• Single Unit Load Allows up to 32 Devices on the Bus
• 1nA Low Current Shutdown Mode (ISL8483)
• Low Quiescent Current:
- 160µA (ISL8483, ISL8488, ISL8489)
- 500µA (ISL8485, ISL8490, ISL8491)
Data rates up to 5Mbps are achievable by using the
ISL8485, ISL8490, or ISL8491, which feature higher slew
rates.
• -7V to +12V Common Mode Input Voltage Range
• Three State Rx and Tx Outputs (Except ISL8488,
ISL8490)
All devices present a “single unit load” to the RS-485 bus,
which allows up to 32 transceivers on the network.
• 30ns Propagation Delays, 5ns Skew (ISL8485, ISL8490,
ISL8491)
Receiver (Rx) inputs feature a “fail-safe if open” design,
which ensures a logic high Rx output if Rx inputs are
floating.
• Full Duplex and Half Duplex Pinouts
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.
• Operate from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for driver
Overload Protection
• Pb-Free Plus Anneal Available (RoHS Compliant)
The ISL8488 - 91 are configured for full duplex (separate Rx
input and Tx output pins) applications. The ISL8488 and
ISL8490 are offered in space saving 8 lead packages for
applications not requiring Rx and Tx output disable functions
(e.g., point-to-point). Half duplex configurations (ISL8483,
ISL8485) multiplex the Rx inputs and Tx outputs to allow
transceivers with Rx and Tx disable functions in 8 lead
packages.
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”
TABLE 1. SUMMARY OF FEATURES
NO. OF DEVICES DATARATE SLEW-RATE RECEIVER/
PART
NUMBER
HALF/FULL
DUPLEX
QUIESCENT LOW POWER
PIN
ALLOWED ON BUS
(Mbps)
0.25
5
LIMITED?
DRIVER ENABLE?
I
(µA) SHUTDOWN? COUNT
CC
160
ISL8483
ISL8485
ISL8488
ISL8489
ISL8490
ISL8491
Half
Half
Full
Full
Full
Full
32
32
32
32
32
32
Yes
Yes
Yes
No
Yes
No
No
No
No
No
8
8
No
500
160
160
500
500
0.25
0.25
5
Yes
8
Yes
Yes
No
14
8
No
5
No
Yes
14
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
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