SCES592I July   2004  – September 2017 SN74AUP1G79

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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: TA = 25°C
    6. 6.6  Electrical Characteristics: TA = -40°C to 85°C
    7. 6.7  Timing Requirements
    8. 6.8  Switching Characteristics: CL = 5 pF
    9. 6.9  Switching Characteristics: CL = 10 pF
    10. 6.10 Switching Characteristics: CL = 15 pF
    11. 6.11 Switching Characteristics: CL = 30 pF
    12. 6.12 Operating Characteristics
    13. 6.13 Typical Characteristics
  7. 7 Parameter Measurement Information
    1. 7.1 Propagation Delays, Setup and Hold Times, and Pulse Width
    2. 7.2 Enable and Disable Times
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Balanced CMOS Push-Pull Outputs
      2. 8.3.2 Standard CMOS Inputs
      3. 8.3.3 Clamp Diodes
      4. 8.3.4 Partial Power Down (Ioff)
      5. 8.3.5 Over-voltage Tolerant Inputs
    4. 8.4 Device Functional Modes
  9. 9 Applications, Implementation, and Layout
    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 Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Community Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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9 Applications, Implementation, and Layout

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

A rotary quadrature encoder is a simple, infinitely-turning knob that outputs two out-of-phase square waves as it is turned and is often used in electronics as a method of human interface. One signal will lead the other in phase depending on which direction the knob is turned. The SN74AUP1G79 can be used to determine which direction the knob is being turned without the need for a microcontroller or other complex monitoring system by connecting the outputs of the knob to the D and CLK inputs of the SN74AUP1G79 as shown in Figure 7. It is important to note that the CLK input will control when the direction signal changes, as shown in Figure 8.

9.2 Typical Application

SN74AUP1G79 SN74AUP1G79_Application1.gif Figure 7. Typical Application Diagram
SN74AUP1G79 SN74AUP1G79_TimingDiagram1.gif Figure 8. Timing Diagram for Quadrature Encoder Application

9.2.1 Design Requirements

The SN74AUP1G79 device uses CMOS technology and has balanced output drive. Take care to avoid bus contention because it can drive currents that would exceed maximum limits.

9.2.2 Detailed Design Procedure

  1. Recommended Input conditions
  2. Recommended output conditions
    • Load currents must not exceed 20 mA on the output and 50 mA total for the part

9.2.3 Application Curves

SN74AUP1G79 fig1_ces604.gif
Figure 9. AUP – The Lowest-Power Family
SN74AUP1G79 fig2_ces604.gif
Figure 10. Excellent Signal Integrity