SLLS868U September   2007  – October 2024 ISO7240C , ISO7240CF , ISO7240M , ISO7241C , ISO7241M , ISO7242C , ISO7242M

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configurations 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: VCC1 and VCC2 at 5-V Operation
    10. 5.10 Supply Current Characteristics: VCC1 and VCC2 at 5-V Operation
    11. 5.11 Electrical Characteristics: VCC1 at 5-V, VCC2 at 3.3-V Operation
    12. 5.12 Supply Current Characteristics: VCC1 at 5-V, VCC2 at 3.3-V Operation
    13. 5.13 Electrical Characteristics: VCC1 at 3.3-V, VCC2 at 5-V Operation
    14. 5.14 Supply Current Characteristics: VCC1 at 3.3-V, VCC2 at 5-V Operation
    15. 5.15 Electrical Characteristics: VCC1 and VCC2 at 3.3 V Operation
    16. 5.16 Supply Current Characteristics: VCC1 and VCC2 at 3.3 V Operation
    17. 5.17 Switching Characteristics: VCC1 and VCC2 at 5-V Operation
    18. 5.18 Switching Characteristics: VCC1 at 5-V, VCC2 at 3.3-V Operation
    19. 5.19 Switching Characteristics: VCC1 at 3.3-V and VCC2 at 5-V Operation
    20. 5.20 Switching Characteristics: VCC1 and VCC2 at 3.3-V Operation
    21. 5.21 Insulation Characteristics Curves
    22. 5.22 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
      1. 7.4.1 Device I/O Schematics
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Isolated Data Acquisition System for Process Control
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Isolated SPI for an Analog Input Module with 16 Inputs
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curve
      3. 8.2.3 Isolated RS-232 Interface
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Curve
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 PCB Material
      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 Related Links
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

3 Description

The ISO7240x, ISO7241x, and ISO7242x devices are quad-channel digital isolators with multiple channel configurations and output-enable functions. These devices have logic-input and logic-output buffers separated by Texas Instrument’s silicon-dioxide (SiO2) isolation barrier. Used in conjunction with isolated power supplies, these devices help block high voltage, isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry.

The ISO7240x family of devices has all four channels in the same direction. The ISO7241x family of devices has three channels in the same direction and one channel in the opposition direction. The ISO7242x family of devices has two channels in each direction.

The devices with the C suffix (C option) have TTL input thresholds and a noise-filter at the input that prevents transient pulses from being passed to the output of the device. The devices with the M suffix (M option) have CMOS VCC/2 input thresholds and do not have the input noise filter or the additional propagation delay.

The ISO7240CF device has an input disable function on pin 7, and a selectable high or low failsafe-output function with the CTRL pin (pin 10). The failsafe output is a logic high when a logic high is placed on the CTRL pin or the pin is left unconnected. If a logic low signal is applied to the CTRL pin, the failsafe output becomes a logic-low output state. The input disable function of the ISO7240CF device prevents data from being passed across the isolation barrier to the output. When the inputs are disabled or VCC1 is powered down, the outputs are set by the CTRL pin.

These devices can be powered from 3.3V or 5V supplies on either side, in any combination. The signal input pins are 5V tolerant regardless of the voltage supply level that is used.

These devices are characterized for operation over the ambient temperature range of –40°C to +125°C.

Package Information
PART NUMBER PACKAGE (1) BODY SIZE (NOM) PACKAGE SIZE(2)
ISO7240CF DW (SOIC, 16) 10.30mm × 7.50mm 10.30mm × 10.30mm
ISO7240C
ISO7240M
ISO7241C
ISO7241M
ISO7242C
ISO7242M
(1) For all available packages, see the orderable addendum at the end of the data sheet.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
ISO7240CF ISO7240C ISO7240M ISO7241C ISO7241M ISO7242C ISO7242M Simplified Schematic
VCCI and GNDI are supply and ground connections respectively for the input channels.
VCCO and GNDO are supply and ground connections respectively for the output channels.
Simplified Schematic