SLLSE45F December   2010  – July 2015 ISO7420E , ISO7420FE , ISO7421E , ISO7421FE

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 = 5 V ± 10%
    6. 6.6  Electrical Characteristics: VCC1 = 5 V ± 10%, VCC2 = 3.3 V ± 10%
    7. 6.7  Electrical Characteristics: VCC1 = 3.3 V ± 10%, VCC2 = 5 V ± 10%
    8. 6.8  Electrical Characteristics: VCC1 and VCC2 = 3.3 V ± 10%
    9. 6.9  Power Dissipation Characteristics
    10. 6.10 Switching Characteristics: VCC1 and VCC2 = 5 V ± 10%
    11. 6.11 Switching Characteristics: VCC1 = 5 V ± 10%, VCC2 = 3.3 V ± 10%
    12. 6.12 Switching Characteristics: VCC1 = 3.3 V ± 10%, VCC2 = 5 V ± 10%
    13. 6.13 Switching Characteristics: VCC1 and VCC2 = 3.3 V ± 10%
    14. 6.14 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 Insulation and Safety-Related Specifications for D-8 Package
      2. 8.3.2 Insulation Characteristics
      3. 8.3.3 Regulatory Information
      4. 8.3.4 Life Expectancy vs Working Voltage
      5. 8.3.5 Safety Limiting Values
    4. 8.4 Device Functional Modes
      1. 8.4.1 Device I/O Schematic
  9. 9 Applications 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 Maximum Supply Current Equations
          1. 9.2.2.1.1 ISO7420
          2. 9.2.2.1.2 ISO7421
        2. 9.2.2.2 Typical Supply Current Equations:
          1. 9.2.2.2.1 ISO7420
          2. 9.2.2.2.2 ISO7421
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 PCB Material
    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 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • D|8
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Signaling Rate > 50 Mbps
  • Default Output 'High' and 'Low' Options
  • Low Power Consumption: Typical ICC per Channel (3.3-V Supplies):
    • ISO7420: 1.4 mA at 1 Mbps, 2.5 mA at
      25 Mbps
    • ISO7421: 1.8 mA at 1 Mbps, 2.8 mA at
      25 Mbps
  • Low Propagation Delay: 7 ns Typical
  • Low Pulse Skew: 200 ps Typical
  • Wide TA Range Specified: –40°C to 125°C
  • 50-KV/μs Transient Immunity, Typical
  • Isolation Barrier Life: > 25 Years
  • Operates from 3-V to 5.5-V Supply Levels
  • 3.3-V and 5-V Level Translation
  • Narrow Body SOIC-8 Package
  • Safety and Regulatory Approvals:
    • 4242 VPK Isolation 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
    • CQC Certification per GB4943.1-2011

2 Applications

  • Opto-Coupler Replacement in:
    • Industrial FieldBus
      • ProfiBus
      • ModBus
      • DeviceNet™ Data Buses
    • Servo Control Interface
    • Motor Control
    • Power Supplies
    • Battery Packs

3 Description

ISO742x provide galvanic isolation up to 2500 VRMS for 1 minute per UL and 4242 VPK per VDE. These devices have two isolated channels. Each channel has a logic input and output buffer separated by a silicon dioxide (SiO2) insulation barrier. Used in conjunction with isolated power supplies, these devices prevent noise currents on a data bus or other circuit from entering the local ground and interfering with or damaging sensitive circuitry. ISO7420 has both channels in the same direction while ISO7421 has the two channels in opposite direction. In case of input power or signal loss, default output is 'low' for devices with suffix 'F' and 'high' for devices without suffix 'F'. ISO742x have no integrated noise filter and thus have fast propagation delays.

These devices have TTL input thresholds and operate from 3-V to 5.5-V supplies. All inputs are 5-V tolerant when supplied from a 3.3-V supply.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
ISO7420E SOIC (8) 4.90 mm x 3.91 mm
ISO7420FE
ISO7421E
ISO7421FE
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

ISO7420E ISO7420FE ISO7421E ISO7421FE Simplified_Schematic_sllse45.gif
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.

4 Revision History

Changes from E Revision (January 2013) to F Revision

  • Changed the datasheet format to the new TI standardGo
  • Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
  • Deleted text from the Description: "CC-grade devices have integrated 10ns-filters for harsh environments where short noise pulses may be present at the device input pins."Go
  • VDE standard changed to DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Go
  • Deleted CC-grade from tPLH, tPHL in the Switching Characteristics tableGo
  • Deleted CC-grade from tPLH, tPHL in the Switching Characteristics tableGo
  • Deleted CC-grade from tPLH, tPHL in the Switching Characteristics tableGo
  • Deleted CC-grade from tPLH, tPHL in the Switching Characteristics tableGo
  • Changed the Available Options Table To the Feature Description tableGo

Changes from D Revision (December 2011) to E Revision

  • Deleted devices ISO7420FCC and ISO7421FCCGo
  • Changed the NOTE: textGo
  • Added table Note to VIORMGo
  • Changed Z to Undetermined for the OUTPUT OUTA, OUTB column of the FUNCTION TABLEGo

Changes from C Revision (March 2011) to D Revision

  • Changed SAFETY feature Bullet From: UL 1577 Approved; Other Approvals Pending To: All Agencies Approvals CompletedGo
  • Changed the REGULATORY INFORMATION tableGo

Changes from B Revision (January 2011) to C Revision

  • Added devices ISO7420FCC and ISO7421FCCGo
  • Changed Feature bullet To: Low Propagation Delay: 7 ns Typical (E-Grade)Go
  • Changed Feature bullet To: Low Pulse Skew: 200 Typical (E-Grade)Go
  • Changed the SAFETY and REGULATORY APPROVALS listGo
  • Changed the data sheet DESCRIPTIONGo
  • Changed the Supply Current values for ISO7421x at 10, 25, and 50 MbpsGo
  • Changed the Supply Current values for ISO7421x at 10, 25, and 50 MbpsGo
  • Changed the Supply Current values for ISO7421x at 10, 25, and 50 MbpsGo
  • Changed the Supply Current values for ISO7421x 25 and 50 MbpsGo
  • Added CC-grade and valued to tPLH, tPHL in the Switching Characteristics tableGo
  • Added ISO7421x values for Pulse width distortion, Channel-to-channel output skew time, and Part-to-part skew timeGo
  • Added CC-grade and valued to tPLH, tPHL in the Switching Characteristics tableGo
  • Added ISO7421x values for Pulse width distortion and Channel-to-channel output skew timeGo
  • Added CC-grade and valued to tPLH, tPHL in the Switching Characteristics tableGo
  • Added CC-grade and valued to tPLH, tPHL in the Switching Characteristics tableGo
  • Added graphs Figure 5, Figure 6, Figure 7, and Figure 8Go
  • Added graphs Figure 14 and Figure 15Go
  • Changed Note 1 Figure 16Go
  • Changed Figure 17Go
  • Changed the Available Options TableGo
  • Changed Isolation resistance test conditionsGo
  • Changed the values of VIORM and VPR in the INSULATION CHARACTERISTICS tableGo
  • Changed the value of VIOTM in the INSULATION CHARACTERISTICS table From: 4000 To: 4242Go
  • Changed Figure 21Go
  • Changed PU to X in the last row of the FUNCTION TABLEGo
  • Added section: SUPPLY CURRENT EQUATIONSGo

Changes from A Revision (December 2010) to B Revision

  • Changed Feature bullet From: ISO7421: TBDmA at 1Mbps, TBDmA at 25Mbps To: ISO7421: 1.8mA at 1Mbps, 2.8mA at 25MbpsGo
  • Updated the ISO7421x Supply Current values for VCC1 and VCC2 = 5VGo
  • Updated the ISO7421x Supply Current values for VCC1 = 5V and VCC2 = 3.3VGo
  • Updated the ISO7421x Supply Current values for VCC1 = 3.3V and VCC2 = 5VGo
  • Updated the ISO7421x Supply Current values for VCC1 and VCC2 = 3.3VGo

Changes from * Revision (December 2010) to A Revision

  • Changed the Max values for Supply current for VCC1 and VCC2, CL = 15pFGo