SLLSE71A September   2011  – November 2024 ISO7231C-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Specifications
    1. 4.1  Absolute Maximum Ratings
    2. 4.2  ESD Ratings
    3. 4.3  Recommended Operating Conditions
    4. 4.4  Thermal Characteristics
    5. 4.5  Power Ratings
    6. 4.6  Insulation Specifications
    7. 4.7  Safety-Related Certifications
    8. 4.8  Safety Limiting Values
    9. 4.9  Electrical Characteristics: VCC1 and VCC2 at 3.3 V Operation
    10. 4.10 Electrical Characteristics: VCC1 and VCC2 at 5-V Operation
    11. 4.11 Electrical Characteristics: VCC1 at 3.3-V, VCC2 at 5-V Operation
    12. 4.12 Electrical Characteristics: VCC1 at 5-V, VCC2 at 3.3-V Operation
    13. 4.13 Switching Characteristics: VCC1 and VCC2 at 3.3-V Operation
    14. 4.14 Switching Characteristics: VCC1 and VCC2 at 5-V Operation
    15. 4.15 Switching Characteristics: VCC1 at 3.3-V and VCC2 at 5-V Operation
    16. 4.16 Switching Characteristics: VCC1 at 5-V, VCC2 at 3.3-V Operation
    17. 4.17 Typical Characteristics
  6. 5 Parameter Measurement Information
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Function Block Diagram
    3. 6.3 Feature Description
    4. 6.4 Device Functional Modes
      1. 6.4.1 Device I/O Schematics
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
      3. 7.2.3 Insulation Characteristics Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 PCB Material
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

3 Description

The ISO7231C-Q1 are triple-channel digital isolators with multiple channel configurations and output enable functions. These devices have logic input and output buffers separated by TI’s silicon dioxide (SiO2) isolation barrier. Used in conjunction with isolated power supplies, these devices block high voltage, isolate grounds, and prevent noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry.

The ISO7231C-Q1 has two channels in one direction and one channel in opposition. These devices have an active-high output enable that when driven to a low level, places the output in a high-impedance state.

The ISO7231C-Q1 have TTL input thresholds and a noise-filter at the input that prevents transient pulses of up to 2ns in duration from being passed to the output of the device.

In each device, a periodic update pulse is sent across the isolation barrier to provide the proper dc level of the output. If this dc-refresh pulse is not received, the input is assumed to be unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state. (Contact TI for a logic low failsafe option).

These devices require two supply voltages of 3.3V, 5V, or any combination. All inputs are 5V tolerant when supplied from a 3.3V supply and all outputs are 4mA CMOS. These devices are characterized for operation over the ambient temperature range of –40°C to 125°C.

Table 3-1 Package Information
DEVICE PACKAGE(1)

BODY SIZE (NOM)

 PACKAGE SIZE(2)
ISO7231C-Q1 DW (SOIC, 16)

10.30mm × 7.50mm

 10.30mm × 10.30mm
(1) For more information, see Section 10.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
ISO7231C-Q1 ISO7231C-Q1 Figure 3-1 ISO7231C-Q1