Interface & Connectivity

Overview

These Renesas 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 Renesas family is specified for 10% tolerance supplies (3V to 3. 6V). The ISL83483 and ISL83488 use 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 (for example, 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, and ISL83491 are configured for full duplex (separate Rx input and Tx output pins) applications. The ISL83488 and ISL83490 are offered in space saving 8 Ld packages for applications not requiring Rx and Tx output disable functions (for example, 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 Ld packages.

ISL8348x_ISL8349x Functional Diagram
ISL8348x_ISL8349x Functional Diagram
  • 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 (eg, RS-232 to RS-422)
  • RS-232 "Extension Cords"

Documentation

Title Type Date
ISL83483, ISL83485, ISL83488, ISL83490, ISL83491 Datasheet
PDF1.02 MB
Datasheet
AN1978: Surge Protection for Renesas' Standard RS-485 Transceivers
PDF1023 KB
Application Note
AN1985: Transient Protection for the Standard RS-485 Transceiver: ISL3152E
PDF207 KB
Application Note
AN1979: Surge Protection simplified with Renesas' Overvoltage Protected (OVP) Transceivers
PDF474 KB
Application Note
R15AN0011: FAQs: RS-485 Transceivers
PDF366 KB
Application Note
R15AN0002: RS-485 Transient Protection in Industrial DC-Supply Buses
PDF178 KB
Application Note
AN1991: Isolating RS-485 Interfaces with High-Speed Digital Optocouplers
PDF513 KB
Application Note
AN1990: RS-485 Transceivers in J1708 Physical Layer Applications of Heavy Duty Vehicles
PDF826 KB
Application Note
AN1987: RS-485 External Fail-Safe Biasing for Isolated Long Haul Buses
PDF443 KB
Application Note
AN1986: External Fail-Safe Biasing of RS-485 Networks
PDF582 KB
Application Note
AN1989: RS-422 vs RS-485: Similarities and Key Differences
PDF440 KB
Application Note
AN1976: Important Transient Immunity Tests for RS-485 Networks
PDF338 KB
Application Note
AN1977: Transient Voltage Suppressors: Operation and Features
PDF365 KB
Application Note
AN1980: Ground Potential Differences: Origin and Remedies
PDF375 KB
Application Note
Analog ICs Brochure
PDF4.91 MB日本語
Brochure
Transceivers Brochure
PDF2.95 MB
Brochure
TB506: Functional Principles of RS-485 Drivers and Receivers
PDF156 KB
Other
TB511: The Unit Load Concept
PDF253 KB
Other
TB505: Understanding the Difference between HBM and IEC 61000-4-2 ESD Immunity
PDF254 KB
Other
PIN19028 - Q3 Cy 19 Price Increase Notice
PDF208 KB
Price Increase Notice
PA16061 - Introduce New T-type End Plug for n-SOIC rail (packing tube)
PDF106 KB
Product Advisory
PCN20017 - Alternate bond wire material and assembly facility of the listed Renesas nSOIC packaged products
PDF266 KB
Product Change Notice
PCN15046 - Wafer Fabrication Site Change for Listed Intersil Products - Global Foundry P6 Process transfer to Palm Bay - Phase II
PDF398 KB
Product Change Notice
PCN12068 - SOIC w/ Copper Bond Wire @ ASECL as Alternate Assembly Site
PDF108 KB
Product Change Notice
RS-485: Transmitting Full-Duplex Data over Single Twisted-Pair Cable
PDF438 KB
Report
R70TB0002: Understanding the Differences in ESD Device-Level Testing
PDF188 KB
Technical Brief
TB509: Detecting Bus Signals Correctly with Failsafe Biased RS-485 Receivers
PDF300 KB
Technical Brief
How to Simplify Industrial PC Interfaces
PDF920 KB 简体中文
White Paper

Design & Development

ECAD Models

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Models

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ISL83483 IBIS Model
IBS40 KB
Model - IBIS

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