SCES983 October   2025 TXB0604

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration 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 Electrical Characteristics
    5. 5.5 Switching Characteristics, VCCA = 0.9V
    6. 5.6 Switching Characteristics, VCCA = 1.2V
    7. 5.7 Switching Characteristics, VCCA = 1.5V ± 0.1V
    8. 5.8 Switching Characteristics, VCCA = 1.8V ± 0.15V
    9. 5.9 Switching Characteristics: Tsk, TMAX (-40°C to 125°C) 
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Architecture
      2. 7.3.2 Input Driver Requirements
      3. 7.3.3 Output Load Considerations
      4. 7.3.4 Enable and Disable
      5. 7.3.5 Pullup or Pulldown Resistors on I/O Lines
      6. 7.3.6 Dummy Cycles
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

8.2.2 Detailed Design Procedure

To begin the design process, determine the following:

  • Series resistor at the device outputs
    • Series resistors must be placed at the device outputs to improve signal integrity and to match the total output impedance to the external transmission path. For example, given that the device output impedance is 21Ω, a 30Ω series resistor provides an effective source impedance close to 50Ω, matching a typical controlled-impedance PCB trace or cable connection.
  • Input voltage range
    • Use the supply voltage of the device that is driving the TXB0604 device to determine the input voltage range. For a valid logic high, the value must exceed the VIH of the input port. For a valid logic low, the value must be less than the VIL of the input port.
  • An external pulldown or pullup resistor decreases the output VOH and VOL. Use the below equations to draft estimate the VOH and VOL as a result of an external pulldown and pullup resistor.
    Equation 3. V O H = V C C x   × R P D   /   R P D + 1.5 k Ω
    Equation 4. V O L = V C C x   × 1.5 k Ω   / R P U + 1.5 k Ω

Where

  • VCCx is the output port supply voltage on either VCCA or VCCB
  • RPD is the value of the external pull down resistor
  • RPU is the value of the external pull up resistor
  • 1.5kΩ is the counting the variation of the serial resistor 1kΩ in the I/O line.