SCAS517D June   1995  – August 2016 SN54ACT244 , SN74ACT244

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
    6. 6.6 Switching Characteristics
    7. 6.7 Operating Characteristics
    8. 6.8 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
    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
      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 Related Links
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Community Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DB|20
  • NS|20
  • N|20
  • DW|20
  • PW|20
Thermal pad, mechanical data (Package|Pins)
Orderable Information

9 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.

9.1 Application Information

The SNx4ACT244 is high-drive buffer drivers providing 24-mA current drive per channel at nominal operating specifications. It can be used as LED driver with appropriate current-limiting resistors to ground or VCC withing the device's and LED's operating characteristics.

9.2 Typical Application

SN54ACT244 SN74ACT244 typ_application.gif Figure 4. Typical LED driving application

9.2.1 Design Requirements

The pullup and pulldown current limiting resistors are chosen to operate within the LED and the SNx4ACT244 device operating specifications. A 1-kΩ resistor, limits the current to less than 5 mA at 5-V VCC operation.

9.2.2 Detailed Design Procedure

  1. Recommended input conditions:
    • For the specified high and low levels See (VIH and VIL) in the Recommended Operating Conditions.
    • Inputs are not overvoltage tolerant and must be limited to VCC.
  2. Recommended output conditions:
    • Limit the output voltage to VCC.
    • Choose the current-limiting resistor for the LED to limit the output current to IO as per the Recommended Operating Conditions.

9.2.3 Application Curve

SN54ACT244 SN74ACT244 D001_scas517.gif Figure 5. VOL vs IOL