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ISO1176T

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40-Mbps, half-duplex, isolated RS-485 & RS-422 transceiver with integrated transformer driver

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40-Mbps, half-duplex, isolated RS-485 & RS-422 transceiver with integrated transformer driver

ISO1176T

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Product details

Parameters

Duplex Half Data rate (Max) (Mbps) 40 Isolation rating (Vrms) 2500 Integrated isolated power Transformer driver Operating temperature range (C) -40 to 85 Fail safe Idle, Open, Short HBM ESD (kV) 10 Surge voltage capability (Vpk) 4000 open-in-new Find other Isolated RS-485 transceivers

Package | Pins | Size

SOIC (DW) 16 77 mm² 10.3 x 7.5 open-in-new Find other Isolated RS-485 transceivers

Features

  • Meets or Exceeds the Requirements of EN 50170
    and TIA/EIA-485-A
  • Signaling Rates up to 40 Mbps
  • Easy Isolated Power Design with Integrated
    Transformer Driver
  • Typical Efficiency > 60% (ILOAD = 100 mA) - see
    SLUU471
  • Differential Output exceeds 2.1 V (54-Ω Load)
  • Low Bus Capacitance 10 pF (Maximum)
  • Fail-safe Receiver for Bus Open, Short, or Idle
  • 50-kV/µs Typical Transient Immunity
  • Safety and Regulatory Approvals
    • 4242 VPK Basic Insulation per DIN V VDE V
      0884-10 and DIN EN 61010-1
    • 2500 VRMS Isolation for 1 minute per UL 1577
    • CSA Component Acceptance Notice 5A, IEC
      60950-1 and IEC 61010-1 Standards
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Description

The ISO1176T is an isolated differential line transceiver with integrated oscillator outputs that provide the primary voltage for an isolation transformer. The device is ideal for long transmission lines because the ground loop is broken to allow the device to operate with a much larger common-mode voltage range.

The symmetrical isolation barrier of each device is tested to provide 4242VPK of isolation per VDE for 60 seconds between the line transceiver and the logic-level interface.

The galvanically isolated differential bus transceiver is an integrated circuit designed for bi-directional data communication on multipoint bus-transmission lines. The transceiver combines a galvanically isolated differential line driver and differential input line receiver. The driver has an active-high enable with isolated enable-state output on the ISODE pin (pin 10) to facilitate direction control. The driver differential outputs and the receiver differential inputs connect internally to form a differential input/output (I/O) bus port that is designed to offer minimum loading to the bus whenever the driver is disabled or VCC2 = 0.

Any cabled I/O can be subjected to electrical noise transients from various sources. These noise transients can cause damage to the transceiver and/or near-by sensitive circuitry if they are of sufficient magnitude and duration. The ISO1176T can significantly reduce the risk of data corruption and damage to expensive control circuits.

The device is characterized for operation over the ambient temperature range of –40°C to 85°C.

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Technical documentation

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Type Title Date
* Datasheet ISO1176T Isolated Profibus RS-485 Transceiver with Integrated Transformer Driver datasheet (Rev. G) Oct. 20, 2015
More literature UL Certification (Rev. O) Feb. 03, 2021
More literature CSA Certification (Rev. P) Nov. 19, 2019
More literature VDE certificate for basic isolation for DIN VDE V 0884-11:2017-01 (Rev. Q) Sep. 20, 2019
Application note How to isolate RS-485 for smallest size and highest reliability (Rev. A) Oct. 18, 2018
Application note How to isolate signal and power for an RS-485 system (Rev. B) Oct. 16, 2018
Application note Robust isolated RS-485 enables new industrial applications (Rev. A) Aug. 13, 2018
More literature Blog: Top 7 design questions about isolated RS-485 transceivers Aug. 06, 2018
Technical article How to select the right industrial Ethernet standard: PROFIBUS Sep. 27, 2016
Technical article Isolation education 101 Mar. 01, 2014
User guide Isolated, 40-Mbps, 3.3-V to 5-V Profibus Interface (Rev. A) Dec. 20, 2013
Application note 3Q 2011 Issue Analog Applications Journal Sep. 16, 2011
Application note Isolated RS-485 transceivers support DMX512 stage lighting & special-effects app Sep. 16, 2011
Application note Журнал по применению аналоговых компонентов 3Q 2011 Sep. 01, 2011
User guide ISO1176T/35T/3086T Evaluation Module User's Guide (Rev. A) Jul. 13, 2010

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description

This document describes the ISO1176T/35T/3086T Evaluation Module (EVM). It is used to evaluate the ISO1176T PROFIBUS Transceiver, the ISO35T RS-485 transceiver, or ISO3086T RS-485 Transceiver. Because the devices are similar transceivers, and the printed-circuit board is the same for all three EVMs (...)

Features

400V peak Isolation, 560V peak VIORM

- UL 1577, IEC 60747-5-2 (VDE 0884,Rev. 2),

- IEC 61010-1, IEC 60950-1 and CSA Apporoved

Meets or Exceeds the Requirments of EN 50170 and TIA/EIA RS-485

Signaling Rate up to 40 Mbps

Differential Output exceeds 2.1V (54 ohm Load)

Low Bus Capacitance-10pF (MAX)

50kV/us (...)

View details
EVALUATION BOARD Download
ISO1176T Small EVM
ISO1176TEVM-433
document-generic User guide
49
Description

The smaller EVM version shows the customer the space required for their design. This circuit provides an isolated, 40 Mbps, 3.3V to 5V Profibus interface using the ISO1176T, isolated Profibus transceiver and the TPS high accuracy linear regulator. The circuit achieves signal and power isolation and (...)

Features
  • 4000V peak Isolation, 560V peak VIORM
  • Meets or Exceeds the Requirements of EN 50170 and TIA/EIA RS-485
  • Signaling rates up to 40 Mbps
  • Differential output exceeds 2.1V (54 ohm load)
  • Low bus capacitance 10pF (MAX)
  • 50KV/us typical transient immunity
  • UL 1577, IEC 60747-5-2 (VDE 0884, Rev. 2) approvals pending
  • (...)
    • View details
    EVALUATION BOARD Download
    document-generic User guide
    49
    Description

    This document describes the ISO1176T/35T/3086T Evaluation Module (EVM). It is used to evaluate the ISO1176T PROFIBUS Transceiver, the ISO35T RS-485 transceiver, or ISO3086T RS-485 Transceiver. Because the devices are similar transceivers, and the printed-circuit board is the same for all three EVMs (...)

    Features

    4000 Vpeak Isolation

    Bus-Pin ESD Protection

    - 16 kV HBM Betweent Bus-Pins and GND2

    - 6 kV HBM Between Bus-Pins and GND1

    1/8 unit Load - Up to 256 Nodes on a Bus

    Designed for RS-458 and RS-422 Applications

    Signaling Rates up to 1 Mbps

    Thermal Shutdown Protection

    Low Bus Capacitance - 16 pF (Typ)

    50 kV/us (...)

    View details

    Software development

    APPLICATION SOFTWARE & FRAMEWORK Download
    PROFIBUS on AM1810 ARM® MPUs and OMAP-L138 DSP+ARM Processors
    PROFIBUS — PROFIBUS (Process Field Bus) is the world’s most successful field bus (communication) technology used in industrial automation and is overseen by the PROFIBUS and PROFINET International (PNO/PI) organization. PROFIBUS is a widely deployed technology, and by the end of 2009, there were over 30 (...)
    Features

    ARM9 frequency: Up to 375 MHz
    Data rates (baud): 12M, 6M, 3M, 1.5M, 500k, 187.5k, 93.75k, 19.2k, 9.6k
    DPv0 support: Cyclic exchange of data and diagnosis
    DPv1 support: Acyclic/cyclic data exchange and alarm handling
    DPv2 support: Not yet supported, please contact TI for additional information
    Response time:  (...)

    View details

    Reference designs

    REFERENCE DESIGNS Download
    Ethernet/IP Communications Dev Platform
    TIDEP0003 — Targeted for Ethernet/IP slave communications, this development platform allows designers to mplement Ethernet/IP communications standards in a broad range of industrial automation equipment. It enables low foot print designs in applications such as industrial automation, factory automation or (...)
    document-generic Schematic
    REFERENCE DESIGNS Download
    Industrial Communications Gateway PROFINET IRT to PROFIBUS Master Reference Design
    TIDEP-0075 — PROFINET is becoming the leading industrial Ethernet protocol in automation due to its high-speed, deterministic communications and enterprise connectivity. However, as the world’s most popular fieldbus, PROFIBUS’s importance and usage will continue for many years due to legacy (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    Parallel Redundancy Protocol (PRP) Ethernet Reference Design for Substation Automation
    TIDEP0054 — This TI Design implements a solution for high-reliability, low-latency network communications for substation automation equipment in Smart Grid transmission and distribution networks. It supports the Parallel Redundancy Protocol (PRP) specification in the IEC 62439 standard using the PRU-ICSS. This (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    PROFINET Communications Dev Platform
    TIDEP0008 — Targeted for PROFINET slave communications, this development platform allows designers to implement PROFINET communications standards in a broad range of industrial automation equipment. It enables low foot print designs in applications such as industrial automation, factory automation or industrial (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    Multi-Protocol Industrial Communications
    TIDEP0032 — Industrial Ethernet for Industrial Automation exist in more than 30 industrial standards. Some of the well-established real-time Ethernet protocols, like EtherCAT, EtherNet/IP, PROFINET, Sercos III and PowerLink require dedicated MAC hardware support in terms of FPGA or ASICs. The Programmable (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    High Performance Pulse Train Output (PTO) with PRU-ICSS for Industrial Applications Reference Design
    TIDEP0027 — The TIDEP0027 High Performance Pulse Train Output (PTO) with PRU-ICSS for Industrial Application combines the AM335x Sitara processor family from Texas Instruments (TI) and the PTO module into a single system-on-chip (SoC) solution. The design is based on the TMDSICE3359 Industrial Communications (...)
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    Isolated Profibus Interface Reference Design
    TIDA-00005 — This reference design provides an isolated, 40-Mbps, 3.3-V to 5-V Profibus interface using the ISO1176T, isolated Profibus transceiver and the TPS76350 high-accuracy linear regulator. This circuit achieves signal and power isolation and at the same time decreases board space and power consumption.
    document-generic Schematic document-generic User guide

    CAD/CAE symbols

    Package Pins Download
    SOIC (DW) 16 View options

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