ISL8483 Datasheet, PDF (1/16 Pages) Intersil Corporation – 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers

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Data Sheet
ISL8483, ISL8485, ISL8488,
ISL8489, ISL8490, ISL8491
December 2003
FN6046.3
5V, Low Power, High Speed or Slew Rate
Limited, RS-485/RS-422 Transceivers
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).
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.
Data rates up to 5Mbps are achievable by using the
ISL8485, ISL8490, or ISL8491, which feature higher slew
rates.
All devices present a “single unit load” to the RS-485 bus,
which allows up to 32 transceivers on the network.
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.
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.
Features
• Specified for 10% Tolerance Supplies
• 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)
• Single Unit Load Allows up to 32 Devices on the Bus
• 1nA Low Current Shutdown Mode (ISL8483)
• Low Quiescent Current:
- 160µA (ISL8483, ISL8488, ISL8489)
- 340µA (ISL8485, ISL8490, ISL8491)
• -7V to +12V Common Mode Input Voltage Range
• Three State Rx and Tx Outputs (Except ISL8488,
ISL8490)
• 30ns Propagation Delays, 5ns Skew (ISL8485, ISL8490,
ISL8491)
• Full Duplex and Half Duplex Pinouts
• Operate from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for driver
Overload Protection
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
PART HALF/FULL NO. OF DEVICES DATA RATE SLEW-RATE
RECEIVER/
QUIESCENT LOW POWER PIN
NUMBER DUPLEX ALLOWED ON BUS (Mbps)
LIMITED? DRIVER ENABLE? I_CC (µA) SHUTDOWN? COUNT
ISL8483
Half
32
0.25
Yes
Yes
160
Yes
8
ISL8485
Half
32
5
No
Yes
340
No
8
ISL8488
Full
32
0.25
Yes
No
160
No
8
ISL8489
Full
32
0.25
Yes
Yes
160
No
14
ISL8490
Full
32
5
No
No
340
No
8
ISL8491
Full
32
5
No
Yes
340
No
14
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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