SCLS375F June   1997  – July 2014 SN74AHCT273

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematics
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  Handling Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics
    6. 7.6  Timing Requirements
    7. 7.7  Switching Characteristics
    8. 7.8  Noise Characteristics
    9. 7.9  Operating Characteristics
    10. 7.10 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 Trademarks
    3. 13.3 Electrostatic Discharge Caution
    4. 13.4 Glossary
  14. 14Mechanical, 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 Detailed Description

9.1 Overview

These circuits are positive-edge-triggered D-type flip-flops with a direct clear (CLR) input. Information at the data (D) inputs meeting the setup time requirements is transferred to the Q outputs on the positive-going edge of the clock (CLK) pulse. Clock triggering occurs at a particular voltage level and is not directly related to the transition time of the positive-going pulse. When CLK is at either the high or low level, the D input has no effect at the output.

The inputs are TTL compatible with VIL at 0.8 V and VIH at 2 V. This feature allows the use of these devices as up translators in a mixed 3.3 V to 5 V system environment.

9.2 Functional Block Diagrams

ld1_cls375.gifFigure 3. Logic Diagram (Positive Logic)
ld2_cls375.gifFigure 4. Logic Diagram, Each Flip-flop (Positive Logic)

9.3 Feature Description

  • Allow up voltage translation from 3.3 V to 5 V
    • Inputs accept TTL voltage levels
  • Slow edge rates minimize output ringing

9.4 Device Functional Modes

Table 1. Function Table
(Each Flip-flop)

INPUTS OUTPUT
Q
CLR CLK D
L X X L
H ↑ H H
H ↑ L L
H L X Q0