The ISL4489E and ISL4491E are ESD protected, “fractional”Unit Load (UL), 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 devices are specified for 10% tolerance supplies (4. 5V to 5. 5V). The Rx inputs and Tx outputs present a 1/8 unit load to the RS-485 bus, which allows a total of 256 transmitters and receivers on the network for large node count systems. 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 ISL4489E uses a slew rate limited driver that reduces EMI and minimizes reflections from improperly terminated transmission lines, or unterminated stubs in multidrop and multipoint applications. Data rates up to 15Mbps are achievable using the ISL4491E, which features higher slew rates. The receiver (Rx) inputs feature a “fail-safe if open” design, which ensures a logic high Rx output if Rx inputs are floating. The 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.

特性

  • Pb-free (RoHS compliant)
  • RS-485 I/O pin ESD protection: ±15kV HBM; Class 3 ESD level on all other pins: >7kV HBM
  • 1/8 unit load allows up to 256 devices on the bus
  • High data rates (ISL4491E): up to 15Mbps
  • Slew rate limited version for error free data transmission (ISL4489E)
  • Very low quiescent current: 140μA (ISL4489E), 370μA (ISL4491E)
  • -7V to +12V common-mode input voltage range
  • Tri-statable Rx and Tx outputs
  • Full duplex pinout
  • Operates from a single +5V supply (10% tolerance)
  • Current limiting and thermal shutdown for driver overload protection

应用

  • Factory Automation
  • Security Networks
  • Building Environmental Control Systems
  • Industrial/Process Control Networks
  • Level Translators (eg, RS-232 to RS-422)
  • RS-232 "Extension Cords"

description文档

文档标题 language 类型 文档格式 文件大小 日期
数据手册与勘误表
star ISL4489E, ISL4491E Datasheet 数据手册 PDF 705 KB
应用指南 & 白皮书
R15AN0002: RS-485 Transient Protection in Industrial DC-Supply Buses Rev.1.00 应用文档 PDF 178 KB
How to Simplify Industrial PC Interfaces English 白皮书 PDF 1010 KB
AN1991: Isolating RS-485 Interfaces with High-Speed Digital Optocouplers 应用文档 PDF 513 KB
AN1990: RS-485 Transceivers in J1708 Physical Layer Applications of Heavy Duty Vehicles 应用文档 PDF 826 KB
AN1987: RS-485 External Fail-Safe Biasing for Isolated Long Haul Buses 应用文档 PDF 443 KB
AN1986: External Fail-Safe Biasing of RS-485 Networks 应用文档 PDF 582 KB
AN1985: Transient Protection for the Standard RS-485 Transceiver: ISL3152E 应用文档 PDF 335 KB
AN1989: RS-422 vs RS-485: Similarities and Key Differences 应用文档 PDF 440 KB
AN1976: Important Transient Immunity Tests for RS-485 Networks 应用文档 PDF 338 KB
AN1977: Transient Voltage Suppressors: Operation and Features 应用文档 PDF 365 KB
AN1978: Surge Protection for Intersil's Standard RS-485 Transceivers 应用文档 PDF 369 KB
AN1979: Surge Protection simplified with Intersil's Overvoltage Protected (OVP) Transceivers 应用文档 PDF 500 KB
AN1980: Ground Potential Differences: Origin and Remedies 应用文档 PDF 375 KB
PCN / PDN
PCN20017 - Alternate bond wire material and assembly facility of the listed Renesas nSOIC packaged products 产品变更通告 PDF 266 KB
PCN15046 - Wafer Fabrication Site Change for Listed Intersil Products - Global Foundry P6 Process transfer to Palm Bay - Phase II 产品变更通告 PDF 398 KB
PCN13026 - Alternate Manufacturing Site for Assembly of the Listed Intersil SOIC Packaged Products - Amkor Technology, Philippines (ATP) 产品变更通告 PDF 77 KB
PCN12068 - SOIC w/ Copper Bond Wire @ ASECL as Alternate Assembly Site 产品变更通告 PDF 108 KB
其他
Analog ICs Brochure 日本語 手册 PDF 4.20 MB
TB506: Functional Principles of RS-485 Drivers and Receivers 其他 PDF 156 KB
TB509: Detecting Bus Signals Correctly with Failsafe Biased RS-485 Receivers 技术摘要 PDF 300 KB
TB511: The Unit Load Concept 其他 PDF 253 KB
TB505: Understanding the Difference between HBM and IEC 61000-4-2 ESD Immunity 其他 PDF 254 KB

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文档标题 language 类型 文档格式 文件大小 日期
模型
isl4489e Model - Other IBS 54 KB