SCES882E December   2017  – December 2023 SN74AXC1T45

PRODUCTION DATA  

  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 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Switching Characteristics
    7. 5.7 Operating Characteristics: TA = 25°C
    8. 5.8 Typical Characteristics
  7. 6 Parameter Measurement Information
    1. 6.1 Load Circuit and Voltage Waveforms
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Fully Configurable Dual-Rail Design Allows Each Port to Operate Over the Full 0.65-V to 3.6-V Power-Supply Range
      2. 7.3.2 I/Os with Integrated Static Pull-Down Resistors
      3. 7.3.3 Support High-Speed Translation
      4. 7.3.4 Ioff Supports Partial-Power-Down Mode Operation
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Enable Times
    2. 8.2 Typical Applications
      1. 8.2.1 Unidirectional Logic Level-Shifting Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curve
      2. 8.2.2 Bidirectional Logic Level-Shifting Application
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curve
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Power-Up Considerations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.2 Bidirectional Logic Level-Shifting Application

Figure 8-3 shows the SN74AXC1T45 being used in a bidirectional logic level-shifting application. Because the SN74AXC1T45 does not have an output-enable (OE) pin, the system designer should take precautions to avoid bus contention between SYSTEM-1 and SYSTEM-2 when changing directions.

GUID-78DA8E6D-B97A-4161-9380-E87B06D8998A-low.gifFigure 8-3 Bidirectional Logic Level-Shifting Application

Table 8-3 lists the data transmission from SYSTEM-1 to SYSTEM-2 and then from SYSTEM-2 to SYSTEM-1.

Table 8-3 Data Transmission: SYSTEM-1 and SYSTEM-2
STATEDIR CTRLI/O-1I/O-2DESCRIPTION
1HOutInSYSTEM-1 data to SYSTEM-2.
2HHi-ZHi-ZSYSTEM-2 is getting ready to send data to SYSTEM-1. I/O-1 and I/O-2 are disabled. The bus-line state depends on pullup or pulldown resistors.(1)
3LHi-ZHi-ZDIR bit is flipped. I/O-1 and I/O-2 still are disabled. The bus-line state depends on pullup or pulldown resistors.(1)
4LInOutSYSTEM-2 data to SYSTEM-1.
(1) SYSTEM-1 and SYSTEM-2 must use the same conditions, essentially, both pullup or both pulldown.