SLLS868T September   2007  – April 2017 ISO7240C , ISO7240CF , ISO7240M , ISO7241C , ISO7241M , ISO7242C , ISO7242M

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (Continued)
  6. 6 Pin Configurations and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Power Ratings
    6. 7.6  Insulation Specifications
    7. 7.7  Safety-Related Certifications
    8. 7.8  Safety Limiting Values
    9. 7.9  Electrical Characteristics: VCC1 and VCC2 at 5-V Operation
    10. 7.10 Supply Current Characteristics: VCC1 and VCC2 at 5-V Operation
    11. 7.11 Electrical Characteristics: VCC1 at 5-V, VCC2 at 3.3-V Operation
    12. 7.12 Supply Current Characteristics: VCC1 at 5-V, VCC2 at 3.3-V Operation
    13. 7.13 Electrical Characteristics: VCC1 at 3.3-V, VCC2 at 5-V Operation
    14. 7.14 Supply Current Characteristics: VCC1 at 3.3-V, VCC2 at 5-V Operation
    15. 7.15 Electrical Characteristics: VCC1 and VCC2 at 3.3 V Operation
    16. 7.16 Supply Current Characteristics: VCC1 and VCC2 at 3.3 V Operation
    17. 7.17 Switching Characteristics: VCC1 and VCC2 at 5-V Operation
    18. 7.18 Switching Characteristics: VCC1 at 5-V, VCC2 at 3.3-V Operation
    19. 7.19 Switching Characteristics: VCC1 at 3.3-V and VCC2 at 5-V Operation
    20. 7.20 Switching Characteristics: VCC1 and VCC2 at 3.3-V Operation
    21. 7.21 Insulation Characteristics Curves
    22. 7.22 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
    4. 9.4 Device Functional Modes
      1. 9.4.1 Device I/O Schematics
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Isolated Data Acquisition System for Process Control
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Isolated SPI for an Analog Input Module with 16 Inputs
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
        3. 10.2.2.3 Application Curve
      3. 10.2.3 Isolated RS-232 Interface
        1. 10.2.3.1 Design Requirements
        2. 10.2.3.2 Detailed Design Procedure
        3. 10.2.3.3 Application Curve
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 PCB Material
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Related Links
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 Community Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

10 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

10.1 Application Information

The ISO724xx family of devices uses a single-ended TTL or CMOS-logic switching technology. The supply voltage range is from 3.15 V to 5.5 V for both supplies, VCC1 and VCC2. When designing with digital isolators, keep in mind that because of the single-ended design structure, digital isolators do not conform to any specific interface standard and are only intended for isolating single-ended CMOS or TTL digital signal lines. The isolator is typically placed between the data controller (that is, μC or UART), and a data converter or a line transceiver, regardless of the interface type or standard.

10.2 Typical Application

10.2.1 Isolated Data Acquisition System for Process Control

The ISO724xx family of devices can be used with Texas Instruments' precision analog-to-digital converter and mixed signal microcontroller to create an advanced isolated data acquisition system as shown in Figure 19.

ISO7240CF ISO7240C ISO7240M ISO7241C ISO7241M ISO7242C ISO7242M app1_slls868.gif Figure 19. Isolated Data Acquisition System for Process Control

10.2.1.1 Design Requirements

Unlike optocouplers, which require external components to improve performance, provide bias, or limit current, the ISO724x family of devices only require two external bypass capacitors to operate.

10.2.1.2 Detailed Design Procedure

ISO7240CF ISO7240C ISO7240M ISO7241C ISO7241M ISO7242C ISO7242M iso7240_slls868.gif Figure 20. ISO7240x Typical Circuit Hook-Up
ISO7240CF ISO7240C ISO7240M ISO7241C ISO7241M ISO7242C ISO7242M iso7240cf_slls868.gif Figure 21. ISO7240CF Typical Circuit Hook-Up
ISO7240CF ISO7240C ISO7240M ISO7241C ISO7241M ISO7242C ISO7242M iso7241_slls868.gif Figure 22. ISO7241x Typical Circuit Hook-Up
ISO7240CF ISO7240C ISO7240M ISO7241C ISO7241M ISO7242C ISO7242M iso7242_slls868.gif Figure 23. ISO7242x Typical Circuit Hook-Up

10.2.1.3 Application Curves

ISO7240CF ISO7240C ISO7240M ISO7241C ISO7241M ISO7242C ISO7242M appc1.png Figure 24. ISO7242M Eye Diagram at 25 Mbps,
3.3 V and 25°C
ISO7240CF ISO7240C ISO7240M ISO7241C ISO7241M ISO7242C ISO7242M appc2.png Figure 25. ISO7242M Eye Diagram at 150 Mbps,
3.3 V and 25°C

10.2.2 Isolated SPI for an Analog Input Module with 16 Inputs

The ISO7241x family of devices and several other components from Texas Instruments can be used to create an isolated SPI for an input module with 16 inputs.

ISO7240CF ISO7240C ISO7240M ISO7241C ISO7241M ISO7242C ISO7242M app2_slls868.gif Figure 26. Isolated SPI for an Analog Input Module With 16 Inputs

10.2.2.1 Design Requirements

See the Design Requirements in the Isolated Data Acquisition System for Process Control section.

10.2.2.2 Detailed Design Procedure

See the Detailed Design Procedure in the Isolated Data Acquisition System for Process Control section..

10.2.2.3 Application Curve

See the Application Curves in the Isolated Data Acquisition System for Process Control section..

10.2.3 Isolated RS-232 Interface

Figure 27 shows a typical isolated RS-232 interface implementation.

ISO7240CF ISO7240C ISO7240M ISO7241C ISO7241M ISO7242C ISO7242M app3_slls868.gif Figure 27. Isolated RS-232 Interface

10.2.3.1 Design Requirements

See the Design Requirements in the Isolated Data Acquisition System for Process Control section.

10.2.3.2 Detailed Design Procedure

See the Detailed Design Procedure in the Isolated Data Acquisition System for Process Control section..

10.2.3.3 Application Curve

See the Application Curves in the Isolated Data Acquisition System for Process Control section..