SLRS021D December   1967  – January 2017 SN55451B , SN55452B , SN55453B , SN55454B , SN75451B , SN75452B , SN75453B , SN75454B

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  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 Recommended Operating Conditions
    3. 7.3 Thermal Information
    4. 7.4 Electrical Characteristics
    5. 7.5 Switching Characteristics, VCC = 5 V, TA = 25°C
    6. 7.6 Dissipation Ratings
    7. 7.7 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagrams
    3. 9.3 Feature Description
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Related Links
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Community Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

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メカニカル・データ（パッケージ｜ピン）
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発注情報

10 Application and Implementation

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.

10.1 Application Information

Typically the SN75451B device drives a high-voltage or high-current peripheral from an MCU or logic device that cannot tolerate these conditions. The following design is a common application of the SN75451B device, driving an LED using one channel and a high voltage peripheral using the other. In this configuration, the LED will turn on whenever the high voltage peripheral is on.

10.2 Typical Application

SN55451B SN55452B SN55453B SN55454B SN75451B SN75452B SN75453B SN75454B SN75451B_typapplication.gif Figure 18. SN75451B Driving an LED and a High Voltage Peripheral

10.2.1 Design Requirements

Each of the inputs to the logic gate should never float. If one of the inputs is floating, then the logic gate could be in an unknown state. Be sure to connect ground or VCC to any unused input channels.

10.2.2 Detailed Design Procedure

  1. Recommended Input Conditions:
  2. Recommended Output Conditions:
    • It is recommended that the load current not exceed 300 mA.
    • The load current must never exceed the IOK noted in Absolute Maximum Ratings.

10.2.3 Application Curves

SN55451B SN55452B SN55453B SN55454B SN75451B SN75452B SN75453B SN75454B VccvsICC-TypChar.png Figure 19. SN75451B Typical Supply Current vs Supply Voltage
SN55451B SN55452B SN55453B SN55454B SN75451B SN75452B SN75453B SN75454B VOLvsIOK-TypChar.png Figure 20. SN75451B Typical Low-Level Output Voltage vs Collector Current