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

5.2 Recommended Operating Conditions

over recommended operating free-air temperature range (unless otherwise noted)(1)
SN54HC166 SN74HC166 UNIT
MIN NOM MAX MIN NOM MAX
VCC Supply voltage 2 5 6 2 5 6 V
VIH High-level input voltage VCC = 2V 1.5 1.5 V
VCC = 4.5V 3.15 3.15
VCC = 6V 4.2 4.2
VIL Low-level input voltage VCC = 2V 0.5 0.5 V
VCC = 4.5V 1.35 1.35
VCC = 6V 1.8 1.8
VI Input voltage 0 VCC 0 VCC V
VO Output voltage 0 VCC 0 VCC V
Δt/Δv(2) Input transition rise/fall time VCC = 2V 1000 1000 ns
VCC = 4.5V 500 500
VCC = 6V 400 400
TA Operating free-air temperature −55 125 −55 125 °C
(1) All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
(2) If this device is used in the threshold region (from VILmax = 0.5 V to VIHmin = 1.5 V), there is a potential to go into the wrong state from induced grounding, causing double clocking. Operating with the inputs at tt = 1000 ns and VCC = 2 V does not damage the device; however, functionally, the CLK inputs are not ensured while in the shift, count, or toggle operating modes.