ZHCSKY9E March   2020  – October 2022 TMUX1308 , TMUX1309

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information: TMUX1308
    5. 7.5  Thermal Information: TMUX1309
    6. 7.6  Electrical Characteristics
    7. 7.7  Logic and Dynamic Characteristics
    8. 7.8  Timing Characteristics
    9. 7.9  Injection Current Coupling
    10. 7.10 Typical Characteristics
  8. 8 Parameter Measurement Information
    1. 8.1  On-Resistance
    2. 8.2  Off-Leakage Current
    3. 8.3  On-Leakage Current
    4. 8.4  Transition Time
    5. 8.5  Break-Before-Make
    6. 8.6  tON(EN) and tOFF(EN)
    7. 8.7  Charge Injection
    8. 8.8  Off Isolation
    9. 8.9  Crosstalk
    10. 8.10 Bandwidth
    11. 8.11 Injection Current Control
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Bidirectional Operation
      2. 9.3.2 Rail-to-Rail Operation
      3. 9.3.3 1.8 V Logic Compatible Inputs
      4. 9.3.4 Fail-Safe Logic
      5. 9.3.5 Injection Current Control
        1. 9.3.5.1 TMUX13xx is Powered, Channel is Unselected, and the Input Signal is Greater Than VDD (VDD = 5 V, VINPUT = 5.5 V)
        2. 9.3.5.2 TMUX13xx is Powered, Channel is Selected, and the Input Signal is Greater Than VDD (VDD = 5 V, VINPUT = 5.5 V)
        3. 9.3.5.3 TMUX13xx is Unpowered and the Input Signal has a Voltage Present (VDD = 0 V, VINPUT = 3 V)
    4. 9.4 Device Functional Modes
    5. 9.5 Truth Tables
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
    3. 10.3 Design Requirements
    4. 10.4 Detailed Design Procedure
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 支持资源
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 术语表
  14. 14Mechanical, Packaging, and Orderable Information

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12.1 Layout Guidelines

When a PCB trace turns a corner at a 90° angle, a reflection can occur. A reflection occurs primarily because of the change of width of the trace. At the apex of the turn, the trace width increases to 1.414 times the width. This increase upsets the transmission-line characteristics, especially the distributed capacitance and self-inductance of the trace which results in the reflection. Not all PCB traces can be straight; therefore, some traces must turn corners. Figure 12-1 shows progressively better techniques of rounding corners. Only the last example (BEST) maintains constant trace width and minimizes reflections.

GUID-933C0178-90BD-47B3-AAA9-09272251ED93-low.gif Figure 12-1 Trace Example

Route high-speed signals using a minimum of vias and corners which reduces signal reflections and impedance changes. When a via must be used, increase the clearance size around it to minimize its capacitance. Each via introduces discontinuities in the signal’s transmission line and increases the chance of picking up interference from the other layers of the board. Be careful when designing test points, through-hole pins are not recommended at high frequencies.

Figure 12-2 shows an example of a PCB layout with the TMUX1308 and TMUX1309. Some key considerations are as follows:

  • Decouple the VDD pin with a 0.1-µF capacitor, placed as close to the pin as possible. Make sure that the capacitor voltage rating is sufficient for the VDD supply.
  • Keep the input lines as short as possible.
  • Use a solid ground plane to help reduce electromagnetic interference (EMI) noise pickup.
  • Do not run sensitive analog traces in parallel with digital traces. Avoid crossing digital and analog traces if possible, and only make perpendicular crossings when necessary.