ISL8488E Datasheet, PDF (1/13 Pages) Intersil Corporation – +-15kV ESD Protected, 5V, Low Power, High Speed and Slew Rate Limited, Full Duplex, RS-485/RS-422 Transceivers

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Data Sheet
ISL8488E, ISL8489E, ISL8491E
October 20, 2004
FN6073.3
±15kV ESD Protected, 5V, Low Power,
High Speed and Slew Rate Limited, Full
Duplex, RS-485/RS-422 Transceivers
The ISL8488E, ISL8489E, ISL8491E devices are ESD
protected, BiCMOS, 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.
Unlike competitive versions, these Intersil devices are
specified for 10% tolerance supplies (4.5V to 5.5V).
These devices are configured for full duplex (separate Rx
input and Tx output pins) applications, so they are ideal for
RS-422 networks requiring high ESD tolerance on the bus
pins. The ISL8488E is an 8 lead version without Rx and Tx
output enables. The other two versions include Rx and Tx
output enable pins in a standard 14 lead pinout.
The ISL8488E, ISL8489E 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
ISL8491E, which features higher slew rates.
The devices present a “single unit load” to the RS-485 bus,
which allows a total of 32 transmitters and receivers on the
network. For “1/8 unit load” versions (256 devices on the
bus), please refer to the ISL4489E, ISL4491E data sheet.
Receiver (Rx) inputs feature a “fail-safe if open” design,
which ensures a logic high Rx output if Rx inputs are floating.
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.
Features
• RS-485 I/O Pin ESD Protection . . . . . . . . . . . . . ±15kV HBM
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
• High Data Rates (ISL8491E) . . . . . . . . . . . up to 10Mbps
• Slew Rate Limited for Error Free Data Transmission
(ISL8488E, ISL8489E)
• Single Unit Load Allows up to 32 Devices on the Bus
(See ISL4489E, ISL4491E for 256 Devices on Bus)
• Low Quiescent Current:
- 120µA (ISL8488E)
- 140µA (ISL8489E)
- 370µA (ISL8491E)
• -7V to +12V Common Mode Input Voltage Range
• Three-State Rx and Tx Outputs (Except ISL8488E)
• Full Duplex Pinout
• Operates from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for Driver
Overload Protection
• Pb-free available (RoHS Compliant)
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 HALF/FULL
NUMBER DUPLEX
ISL8488E
Full
ISL8489E
Full
ISL8491E
Full
HIGH ESD?
Yes
Yes
Yes
TABLE 1. SUMMARY OF FEATURES
NO. OF DEVICES DATA RATE SLEW-RATE
RECEIVER/
QUIESCENT PIN
ALLOWED ON BUS (Mbps)
LIMITED? DRIVER ENABLE? I_CC (µA) COUNT
32
0.25
Yes
No
120
8
32
0.25
Yes
Yes
140
14
32
10
No
Yes
370
14
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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