The ISL8487E, ISL81487L, and ISL81487E RS-485/RS-422 devices 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/receiver input is protected against ±15kV ESD strikes without latch-up. Unlike competitive devices, this device family is specified for 10% tolerance supplies (4. 5V to 5. 5V). All devices present a 1/8 unit load to the RS-485 bus, which allows up to 256 transceivers on the network for large node count systems (for example, process automation and remote meter reading systems). In a remote utility meter reading system, individual utility meter readings (in apartments, for example) are routed to a concentrator with an RS-485 network, so the high allowed node count minimizes the number of repeaters required to network all the meters. Data for all meters is then read out from the concentrator from a single access port or a wireless link. Slew rate limited drivers on the ISL8487E and ISL81487L reduce EMI and minimize reflections from improperly terminated transmission lines or unterminated stubs in multidrop and multipoint applications. Data rates up to 250kbps are achievable with these devices. Data rates up to 5Mbps are achievable by using the ISL81487E, 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. The half duplex devices multiplex the Rx inputs and Tx outputs to allow transceivers with Rx and Tx disable functions in 8 lead packages.

特長

  • RS-485 I/O pin ESD protection: ±15kV HBM
  • Class 3 ESD level on all other pins: >7kV HBM
  • Fractional unit load allows up to 256 devices on the bus
  • Specified for 10% tolerance supplies
  • High data rate version (ISL81487E): up to 5Mbps
  • Slew rate limited versions for error free data transmission (ISL8487E, ISL81487L): up to 250kbps
  • Low current shutdown mode (except ISL81487E): 0.5μA
  • Low quiescent supply current:
  • ISL8487E, ISL81487L: 145μA (maximum)
  • ISL81487E: 420μA (maximum)
  • -7V to +12V common mode input voltage range
  • Three state Rx and Tx outputs
  • 30ns propagation delays, 5ns skew (ISL81487E)
  • Half duplex pinouts
  • Operate from a single +5V supply (10% tolerance)
  • Current limiting and thermal shutdown for driver overload protection
  • Pin compatible replacements for: MAX487E, (ISL8487E); LTC1487, ADM1487 (ISL81487L); MAX1487E, ST485ER (ISL81487E)
  • Pb-free plus anneal available (RoHS compliant)

アプリケーション

  • High Node Count Networks
  • Automated Utility Meter Reading Systems
  • Factory Automation
  • Security Networks
  • Building Environmental Control Systems
  • Industrial/Process Control Networks

descriptionドキュメント

タイトル language 分類 形式 サイズ 日付
データシート
star ISL8487E, ISL81487L, ISL81487E Datasheet データシート PDF 816 KB
アプリケーションノート、ホワイトペーパー
R15AN0002: RS-485 Transient Protection in Industrial DC-Supply Buses Rev.1.00 アプリケーションノート PDF 178 KB
How to Simplify Industrial PC Interfaces 简体中文 ホワイトペーパー PDF 920 KB
AN1991: Isolating RS-485 Interfaces with High-Speed Digital Optocouplers アプリケーションノート PDF 513 KB
AN1990: RS-485 Transceivers in J1708 Physical Layer Applications of Heavy Duty Vehicles アプリケーションノート PDF 826 KB
AN1987: RS-485 External Fail-Safe Biasing for Isolated Long Haul Buses アプリケーションノート PDF 443 KB
AN1986: External Fail-Safe Biasing of RS-485 Networks アプリケーションノート PDF 582 KB
AN1985: Transient Protection for the Standard RS-485 Transceiver: ISL3152E アプリケーションノート PDF 335 KB
AN1989: RS-422 vs RS-485: Similarities and Key Differences アプリケーションノート PDF 440 KB
AN1976: Important Transient Immunity Tests for RS-485 Networks アプリケーションノート PDF 338 KB
AN1977: Transient Voltage Suppressors: Operation and Features アプリケーションノート PDF 365 KB
AN1978: Surge Protection for Intersil's Standard RS-485 Transceivers アプリケーションノート PDF 369 KB
AN1979: Surge Protection simplified with Intersil's Overvoltage Protected (OVP) Transceivers アプリケーションノート PDF 500 KB
AN1980: Ground Potential Differences: Origin and Remedies アプリケーションノート PDF 375 KB
PCN / PDN
PCN20017 - Alternate bond wire material and assembly facility of the listed Renesas nSOIC packaged products 製品変更通知 PDF 266 KB
PA16061 - Introduce New T-type End Plug for n-SOIC rail (packing tube) Product Advisory PDF 106 KB
PCN15046 - Wafer Fabrication Site Change for Listed Intersil Products - Global Foundry P6 Process transfer to Palm Bay - Phase II 製品変更通知 PDF 398 KB
PCN12086 - Alternate Manufacturing Site for Assembly of the Listed Intersil PDIP Packaged Products -Amkor Technology, Philippines (ATP) 製品変更通知 PDF 86 KB
PCN12068 - SOIC w/ Copper Bond Wire @ ASECL as Alternate Assembly Site 製品変更通知 PDF 108 KB
その他資料
アナログIC & ディスクリート カタログ English カタログ PDF 6.48 MB
TB506: Functional Principles of RS-485 Drivers and Receivers その他資料 PDF 156 KB
TB509: Detecting Bus Signals Correctly with Failsafe Biased RS-485 Receivers 技術概要 PDF 300 KB
TB511: The Unit Load Concept その他資料 PDF 253 KB
TB505: Understanding the Difference between HBM and IEC 61000-4-2 ESD Immunity その他資料 PDF 254 KB

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タイトル language 分類 形式 サイズ 日付
モデル
isl81487e Model - Other IBS 47 KB