SLVSJ21 June   2026 ISO6431-Q1

PRODMIX  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 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  Power Ratings
    6. 6.6  Insulation Specifications
    7. 6.7  Safety-Related Certifications
    8. 6.8  Safety Limiting Values 
    9. 6.9  Electrical Characteristics—5V Supply
    10. 6.10 Supply Current Characteristics—5V Supply 
    11. 6.11 Electrical Characteristics—3.3V Supply
    12. 6.12 Supply Current Characteristics—3.3V Supply 
    13. 6.13 Electrical Characteristics—2.5V Supply 
    14. 6.14 Supply Current Characteristics—2.5V Supply 
    15. 6.15 Switching Characteristics—5V Supply
    16. 6.16 Switching Characteristics—3.3V Supply
    17. 6.17 Switching Characteristics—2.5V Supply
    18. 6.18 Insulation Characteristics Curves
    19. 6.19 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Electromagnetic Compatibility (EMC) Considerations
    4. 8.4 Device Functional Modes
    5. 8.5 Device I/O Schematics
    6. 8.6 Overvoltage Tolerant Input
  10. 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
      3. 9.2.3 Application Curve
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Device Nomenclature
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1.     57
    2.     58
    3.     59

8.4 Device Functional Modes

The following table lists the functional modes for the ISO643x-Q1 devices.

Table 8-2 Function Table
VCCI(1) VCCO INPUT
(INx) 		OUTPUT ENABLE
(ENx)		 OUTPUT
(OUTx)		 COMMENTS
PU PU H H or open H Normal Operation: A channel output assumes the logic state of the input.
L H or open L
Open H or open Default Default mode: When INx is open, the corresponding channel output goes to the default logic state. Default is High for ISO643x-Q1 and Low for ISO643xF-Q1 (with F suffix).
X PU X L Z A low value of output enable causes the outputs to be high-impedance.
PD PU X H or open Default Default mode: When VCCI is unpowered, a channel output assumes the logic state based on the selected default option. Default is High for ISO643x-Q1 and Low for ISO643xF-Q1 (with F suffix).
When VCCI transitions from unpowered to powered-up, a channel output assumes the logic state of the input.
When VCCI transitions from powered-up to unpowered, channel output assumes the selected default state.
X PD X X Undetermined When VCCO is unpowered, a channel output is undetermined(2). When VCCO transitions from unpowered to powered-up, a channel output assumes the logic state of the input.
(1) VCCI = Input-side VCC; VCCO = Output-side VCC; PU = Powered up (VCC ≥ VCC_RO(MIN)); PD = Powered down (VCC ≤ VCC_UVLO–); X = Irrelevant; H = High level; L = Low level; Z = High Impedance
(2) The outputs are in undetermined state when VCC_UVLO– ≤ VCCI or VCCO < VCC ≥ VCC_RO(MIN).