ZHCSRP7A September   2020  – June 2021 SN74HCS137

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     4
    2.     5
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     8
    2.     9
  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
    6. 6.6 Timing Characteristics
    7. 6.7 Switching Characteristics
    8. 6.8 Operating Characteristics
    9. 6.9 Typical Characteristics
  7. 7 Parameter Measurement Information
  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 CMOS Schmitt-Trigger Inputs
      3. 8.3.3 Clamp Diode Structure
    4. 8.4 Device Functional Modes
  9. 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 Power Considerations
        2. 9.2.1.2 Input Considerations
        3. 9.2.1.3 Output Considerations
      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 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 接收文档更新通知
    3. 12.3 支持资源
    4. 12.4 Trademarks
    5. 12.5 静电放电警告
    6. 12.6 术语表
  13. 13Mechanical, Packaging, and Orderable Information

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8.1 Overview

The SN74HCS137 is a high speed silicon gate CMOS decoder well suited to memory address decoding or data routing applications. It contains a single 3:8 decoder. All inputs include Schmitt-triggers allowing for slow input transitions and providing additional noise margin.

The SN74HCS137 has three address select inputs (A2, A1, and A0). When the latch enable (LE) input is low, the circuit functions as a normal one-of-eight decoder. When the latch enable (LE) input is high, the address latches will maintain their previous states, regardless of any changes at the address select inputs.

Two strobe inputs (G1 and G0) are provided to simplify cascading and to facilitate demultiplexing. When any input strobe is active, all outputs are forced into the high state.

The demultiplexing function is accomplished by first using the select inputs to choose the desired output, and then using one of the strobe inputs as the data input.

The outputs for the SN74HCS137 are normally high, and low when selected.