SCHS156D February   1998  – November 2021 CD54HC165 , CD54HCT165 , CD74HC165 , CD74HCT165

PRODUCTION DATA  

  1. 1 Features
  2. 2 Description
  3. 3 Revision History
  4. 4 Pin Configuration and Functions
  5. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Reccomended Operating Conditions
    3. 5.3 Thermal Information
    4. 5.4 Electrical Characteristics
    5. 5.5 Prerequisite for Switching Characteristics
    6. 5.6 Switching Characteristics
  6. 6 Parameter Measurement Information
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Device Functional Modes
  8. 8 Power Supply Recommendations
  9. 9 Layout
    1. 9.1 Layout Guidelines
  10. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • N|16
  • D|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.1 Overview

The ’HC165 and ’HCT165 are 8-bit parallel or serial-in shift registers with complementary serial outputs (QH and QH) available from the last stage. When the parallel load (SH/LD) input is LOW, parallel data from the A to H inputs are loaded into the register asynchronously. When the SH/LD is HIGH, data enters the register serially at the SER input and shifts one place to the right (A→B→C, etc.) with each positive-going clock transition. This feature allows parallel-to-serial converter expansion by connecting the QH output to the SER input of the succeeding device.

For predictable operation the LOW-to-HIGH transition of CLK INH should only take place while CLK is HIGH. Also, CLK and CLK INH should be LOW before the LOW-to-HIGH transition of SH/LD to prevent shifting the data when SH/LD goes HIGH.