SLLSG26A March   2026  – July 2026 ISOW1050

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  Power Ratings
    6. 5.6  Insulation Specifications
    7. 5.7  Safety-Related Certifications
    8. 5.8  Safety Limiting Values
    9. 5.9  Electrical Characteristics
    10. 5.10 Supply Current Characteristics
    11. 5.11 Switching Characteristics
    12. 5.12 Insulation Characteristics Curves
    13. 5.13 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Power Isolation
    3. 7.3 Signal Isolation
    4. 7.4 CAN Transceiver
    5. 7.5 Functional Block Diagram
    6. 7.6 Feature Description
      1. 7.6.1 CAN Bus States
      2. 7.6.2 Digital Inputs and Outputs: TXD (Input) and RXD (Output)
      3. 7.6.3 TXD Dominant Timeout (DTO)
      4. 7.6.4 Power-Up and Power-Down Behavior
      5. 7.6.5 Protection Features
      6. 7.6.6 Floating Pins, Unpowered Device
      7. 7.6.7 Glitch-Free Power Up and Power Down
    7. 7.7 Device Functional Modes
    8. 7.8 Device I/O Schematics
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Bus Loading, Length and Number of Nodes
        2. 8.2.2.2 CAN Termination
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

8.2.2.1 Bus Loading, Length and Number of Nodes

The ISO 11898-2 Standard specifies a maximum bus length of 40m and maximum stub length of 0.3m. However, with careful design, users can have longer cables, longer stub lengths, and many more nodes to a bus. A large number of nodes requires transceivers with high input impedance such as the ISOW1050 transceiver.

Many CAN organizations and standards have scaled the use of CAN for applications outside the original ISO 11898-2 Standard. These organizations and standards have made system-level trade-offs for data rate, cable length, and parasitic loading of the bus. Examples of some of these specifications are ARINC825, CANopen, DeviceNet, and NMEA2000.

The ISOW1050 device is specified to meet the 1.5V requirement with a 50Ω load, incorporating the worst case including parallel transceivers. The differential input resistance of the device is a minimum of 30kΩ. If 100 ISOW1050 transceivers are in parallel on a bus, this requirement is equivalent to a 300Ω differential load worst case. That transceiver load of 300Ω in parallel with the 60Ω gives an equivalent loading of 50Ω. Therefore, the ISOW1050 device theoretically supports up to 100 transceivers on a single bus segment. However, for CAN network design margin must be given for signal loss across the system and cabling, parasitic loadings, network imbalances, ground offsets and signal integrity, therefore a practical maximum number of nodes is typically much lower. Bus length can also be extended beyond the original ISO 11898 standard of 40m by careful system design and data-rate tradeoffs. For example, CAN open network design guidelines allow the network to be up to 1km with changes in the termination resistance, cabling, less than 64 nodes, and a significantly lowered data rate.

This flexibility in CAN network design is one of the key strengths of the various extensions and additional standards that have been built on the original ISO 11898-2 CAN standard. Using this flexibility requires the responsibility of good network design and balancing these tradeoffs.