SCLS916 may   2023 SN74LV2T74-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  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  Electrical Characteristics
    6. 6.6  Timing Characteristics 1.8-V VCC
    7. 6.7  Timing Characteristics 2.5-V VCC
    8. 6.8  Timing Characteristics 3.3-V VCC
    9. 6.9  Timing Characteristics 5-V VCC
    10. 6.10 Switching Characteristics 1.8-V VCC
    11. 6.11 Switching Characteristics 2.5-V VCC
    12. 6.12 Switching Characteristics 3.3-V VCC
    13. 6.13 Switching Characteristics 5-V VCC
    14. 6.14 Noise Characteristics
    15. 6.15 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 Balanced CMOS 3-State Outputs
      2. 8.3.2 Clamp Diode Structure
      3. 8.3.3 LVxT Enhanced Input Voltage
        1. 8.3.3.1 Down Translation
        2. 8.3.3.2 Up Translation
      4. 8.3.4 Wettable Flanks
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
        1. 9.2.1.1 Input Considerations
        2. 9.2.1.2 Output Considerations
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  11. 10Power Supply Recommendations
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Mechanical, Packaging, and Orderable Information

Package Options

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

8.3.3 LVxT Enhanced Input Voltage

The SN74LV2T74-Q1 belongs to TI's LVxT family of logic devices with integrated voltage level translation. This family of devices was designed with reduced input voltage thresholds to support up-translation, and inputs tolerant of signals with up to 5.5 V levels to support down-translation. The output voltage will always be referenced to the supply voltage (VCC), as described in the Electrical Characteristics table. To ensure proper functionality, input signals must remain at or below the specified VIH(MIN) level for a HIGH input state, and at or below the specified VIL(MAX) for a LOW input state. Figure 8-3 shows the typical VIH and VIL levels for the LVxT family of devices, as well as the voltage levels for standard CMOS devices for comparison.

The inputs are high impedance and are typically modeled as a resistor in parallel with the input capacitance given in the Electrical Characteristics. The worst case resistance is calculated with the maximum input voltage, given in the Absolute Maximum Ratings, and the maximum input leakage current, given in the Electrical Characteristics, using Ohm's law (R = V ÷ I).

The inputs require that input signals transition between valid logic states quickly, as defined by the input transition time or rate in the Recommended Operating Conditions table. Failing to meet this specification will result in excessive power consumption and could cause oscillations. More details can be found in the Implications of Slow or Floating CMOS Inputs application report.

Do not leave inputs floating at any time during operation. Unused inputs must be terminated at VCC or GND. If a system will not be actively driving an input at all times, then a pull-up or pull-down resistor can be added to provide a valid input voltage during these times. The resistor value will depend on multiple factors; however, a 10-kΩ resistor is recommended and will typically meet all requirements.

GUID-CA950F6B-2B3F-4FDE-87C0-F51047C4B97A-low.gifFigure 8-3 LVxT Input Voltage Levels