SCLS040G December   1982  – March 2015 SN74HC594

UNLESS OTHERWISE NOTED, this document contains 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: CL = 50 pF
    7. 6.7  Switching Characteristics: CL = 150 pF
    8. 6.8  Timing Requirements
    9. 6.9  Operating Characteristics
    10. 6.10 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 Curves
  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 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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8 Detailed Description

8.1 Overview

The SNx4HC594 devices contain an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register. Separate clocks and direct overriding clear (RCLR, SRCLR) inputs are provided on both the shift and storage registers. A serial (QH’) output is provided for cascading purposes.

Both the shift register (SRCLK) and storage register (RCLK) clocks are positive edge triggered. If both clocks are connected together, the shift register always is one count pulse ahead of the storage register.

The parallel (QA − QH) outputs have high-current capability. QH’ is a standard output.

8.2 Functional Block Diagram

SN54HC594 SN74HC594 logic_cls040.gifFigure 5. Logic Diagram (Positive Logic)

8.3 Feature Description

The wide operating range allows the device to be used in a variety of systems that use different logic levels. The high-current outputs allow the device to drive medium loads without significant drops in output voltage. In addition, the low power consumption makes this device a good choice for portable and battery power-sensitive applications.

8.4 Device Functional Modes

Table 1. Function Table

INPUTS FUNCTION
SER SRCLK SRCLR RCLK RCLR
X X L X X Shift register is cleared.
L ↑ H X X First stage of shift register goes low.
Other stages store the data of previous stage, respectively.
H ↑ H X X First stage of shift register goes high.
Other stages store the data of previous stage, respectively.
L ↓ H X X Shift register state is not changed.
X X X X L Storage register is cleared.
X X X ↑ H Shift register data is stored in the storage register.
X X X ↓ H Storage register state is not changed.