SCES727A June   2008  – December 2014 TXB0104-Q1

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  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
    6. 6.6  Timing Requirements: VCCA = 1.2 V
    7. 6.7  Timing Requirements: VCCA = 1.5 V ± 0.1 V
    8. 6.8  Timing Requirements: VCCA = 1.8 V ± 0.15 V
    9. 6.9  Timing Requirements: VCCA = 2.5 V ± 0.2 V
    10. 6.10 Timing Requirements: VCCA = 3.3 V ± 0.3 V
    11. 6.11 Switching Characteristics: VCCA = 1.2 V
    12. 6.12 Switching Characteristics: VCCA = 1.5 V ± 0.1 V
    13. 6.13 Switching Characteristics: VCCA = 1.8 V ± 0.15 V
    14. 6.14 Switching Characteristics: VCCA = 2.5 V ± 0.2 V
    15. 6.15 Switching Characteristics: VCCA = 3.3 V ± 0.3 V
    16. 6.16 Operating Characteristics
    17. 6.17 Typical Characteristics
  7. Parameter Measurement Information
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Architecture
      2. 8.3.2 Input Driver Requirements
      3. 8.3.3 Output Load Considerations
      4. 8.3.4 Enable and Disable
      5. 8.3.5 Pullup or Pulldown Resistors on I/O Lines
    4. 8.4 Device Functional Modes
  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
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Trademarks
    2. 12.2 Electrostatic Discharge Caution
    3. 12.3 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

The TXB0104 can be used in level-translation applications for interfacing devices or systems operating at different interface voltages with one another. It can only translate push-pull CMOS logic outputs. If for open-drain signal translation, please refer to TI TXS010X products. Any external pulldown or pullup resistors are recommended larger than 50 kΩ.

9.2 Typical Application

Typ_App_TXB0104.gifFigure 7. Typical Application Schematic

9.2.1 Design Requirements

For this design example, use the parameters listed in Table 1. And make sure the VCCA ≤VCCB.

Table 1. Design Parameters

DESIGN PARAMETERS EXAMPLE VALUE
Input voltage range 1.2 V to 3.6 V
Output voltage range 1.65 V to 5.5 V

9.2.2 Detailed Design Procedure

To begin the design process, determine the following:

• Input voltage range

- Use the supply voltage of the device that is driving the TXB0104 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.

• Output voltage range

- Use the supply voltage of the device that the TXB0104 device is driving to determine the output voltage range.

- It is not recommended to have the external pullup or pulldown resistors. If mandatory, it is recommended the value should be larger than 50 kΩ.

• 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 1. VOH = VCCx × RPD / (RPD + 4.5 kΩ)
Equation 2. VOL = VCCx × 4.5 kΩ / (RPU + 4.5 kΩ)

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
  • 4.5 kΩ is the counting the variation of the serial resistor 4 kΩ in the I/O line

9.2.3 Application Curve

level-translation-signal.pngFigure 8. Example of Level Translation of a 2.5-MHz 1.8 V Signal (Green) to a 3.3 V Signal (Pink)