SLLSE89G September   2011  – January 2015 ISO7640FM , ISO7641FM

UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics: VCC1 and VCC2 at 5 V ±10%
    6. 6.6  Electrical Characteristics: VCC1 at 5 V ±10% and VCC2 at 3.3 V ±10%
    7. 6.7  Electrical Characteristics: VCC1 at 3.3 V ±10% and VCC2 at 5 V ±10%
    8. 6.8  Electrical Characteristics: VCC1 and VCC2 at 3.3 V ±10%
    9. 6.9  Electrical Characteristics: VCC1 and VCC2 at 2.7 V
    10. 6.10 Supply Current: VCC1 and VCC2 at 5 V ±10%
    11. 6.11 Supply Current: VCC1 at 5 V ±10% and VCC2 at 3.3 V ±10%
    12. 6.12 Supply Current: VCC1 at 3.3 V ±10% and VCC2 at 5 V ±10%
    13. 6.13 Supply Current: VCC1 and VCC2 at 3.3 V ±10%
    14. 6.14 Supply Current: VCC1 and VCC2 at 2.7 V
    15. 6.15 Switching Characteristics: VCC1 and VCC2 at 5 V ±10%
    16. 6.16 Switching Characteristics: VCC1 at 5 V ±10% and VCC2 at 3.3 V ±10%
    17. 6.17 Switching Characteristics: VCC1 at 3.3 V ±10% and VCC2 at 5 V ±10%
    18. 6.18 Switching Characteristics: VCC1 and VCC2 at 3.3 V ±10%
    19. 6.19 Switching Characteristics: VCC1 and VCC2 at 2.7 V
    20. 6.20 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 IEC Insulation and Safety-Related Specifications for DW-16 Package
      2. 8.3.2 DIN V VDE V 0884-10 (VDE V 0884-10) Insulation Characteristics
      3. 8.3.3 Safety Limiting Values
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Typical Supply Current Equations
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Related Links
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

9 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.

9.1 Application Information

ISO764x use single-ended TTL-logic switching technology. Its supply voltage range is from 3 V to 5.5 V for both supplies, VCC1 and VCC2. When designing with digital isolators, it is important to note that due to 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.

9.2 Typical Application

ISO7640FM ISO7641FM typapp1_sllse89.gifFigure 16. Isolated Data Acquisition System for Process Control

9.2.1 Design Requirements

Unlike optocouplers, which require external components to improve performance, provide bias, or limit current, the ISO764x device only requires two external bypass capacitors to operate.

9.2.2 Detailed Design Procedure

ISO7640FM ISO7641FM ddp1_sllse89.gifFigure 17. Typical ISO7640FM Circuit Hookup
ISO7640FM ISO7641FM ddp2_sllse89.gifFigure 18. Typical ISO7641FM Circuit Hookup

9.2.2.1 Typical Supply Current Equations

(Calculated based on room temperature and typical Silicon process)

ISO7640FM:

At VCC1 = VCC2 = 3.3 V

Equation 1. ICC1 = 0.388 + 0.0312 × f
Equation 2. ICC2 = 3.39 + 0.03561 × f + 0.006588 × f × CL

At VCC1 = VCC2 = 5 V

Equation 3. ICC1 = 0.584 + 0.05349 × f
Equation 4. ICC2 = 4.184 + 0.05597 × f + 0.009771 × f × CL

ISO7641FM:

At VCC1 = VCC2 = 3.3 V

Equation 5. ICC1 = 1.848 + 0.03233 × f + 0.001645 × f × CL
Equation 6. ICC2 = 3.005 + 0.03459 x f + 0.0049395 × f × CL

At VCC1 = VCC2 = 5 V

Equation 7. ICC1 = 2.369 + 0.05385 × f + 0.002448 × f × CL
Equation 8. ICC2 = 3.857 + 0.05506 × f + 0.007348 × f × CL

ICC1 and ICC2 are typical supply currents measured in mA; f is data rate measured in Mbps; CL is the capacitive load on each channel measured in pF.

9.2.3 Application Curves

ISO7640FM ISO7641FM eye_pat1_llse89.gifFigure 19. Typical Eye Diagram at 150 Mbps,
5-V Operation
ISO7640FM ISO7641FM eye_pat2_llse89.gifFigure 20. Typical Eye Diagram at 150 Mbps,
3.3-V Operation