SCLS117F December   1982  – May 2025 SN54HC166 , SN54HC166-SP , SN74HC166

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Recommended Operating Conditions
    3. 5.3 Thermal Information
    4. 5.4 Electrical Characteristics
    5. 5.5 Timing Requirements
    6.     12
    7. 5.6 Switching Characteristics
    8. 5.7 Operating Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Standard CMOS Inputs
      2. 7.3.2 TTL-Compatible CMOS Inputs
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
        1. 8.2.1.1 Power Considerations
        2. 8.2.1.2 Input Considerations
        3. 8.2.1.3 Output Considerations
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.4 Device Functional Modes

Table 7-1 lists the functional modes of the SNx4HC166.

Table 7-1 Operating Mode Table
INPUTS(1) FUNCTION
SH/LD CLK CLK INH
L X X Parallel load(2)
H H X No change
H X H No change
H L ↑ Shift(3)
H ↑ L Shift(3)
(1) H = High voltage level, L = Low voltage level, X = Don't care, ↑ = Low to high transition
(2) Parallel load : Values at inputs A through H are loaded to respective internal registers synchronously with the clock.
(3) Shift : Content of each internal register shifts towards serial output QH synchronously with the clock. Data at SER is shifted into the first register.
Table 7-2 Output Function Table
INTERNAL REGISTERS(1)(2) OUTPUTS(3)
A — G H Q
X L L
X H H
(1) Internal registers refer to the shift registers inside the device. These values are set by loading data from the parallel or serial inputs.
(2) H = High voltage level, L = Low voltage level, X = Don't care
(3) H = Driving high, L = Driving low