SCHS196E September   1997  – October 2022 CD54HC688 , CD54HCT688 , CD74HC688 , CD74HCT688

PRODMIX  

  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 (1)
    2. 5.2 Recommended Operating Conditions
    3. 5.3 Thermal Information
    4. 5.4 Electrical Characteristics
    5. 5.5 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)
  • NS|20
  • N|20
  • DW|20
  • PW|20
Thermal pad, mechanical data (Package|Pins)
Orderable Information

2 Description

The ’HC688 and ’HCT688 are 8-bit magnitude comparators designed for use in computer and logic applications that require the comparison of two 8-bit binary words. When the compared words are equal the output (Y) is low and can be used as the enabling input for the next device in a cascaded application.

Package Information
PART NUMBER PACKAGE(1) BODY SIZE (NOM)
CD74HC688M SOIC (20) 12.80 mm × 7.50 mm
CD74HCT688M SOIC (20) 12.80 mm × 7.50 mm
CD74HC688E PDIP (20) 25.40 mm × 6.35 mm
CD74HCT688E PDIP (20) 25.40 mm × 6.35 mm
CD74HC688NSR SO (20) 15.00 mm × 5.30 mm
CD74HC688PWR TSSOP (20) 6.50 mm × 4.40 mm
CD54HC688F3A CDIP (20) 26.92 mm × 6.92 mm
CD54HCT688F3A CDIP (20) 26.92 mm × 6.92 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
GUID-20211230-SS0I-4XWM-P7B4-J1GNPCJGTFJW-low.gifFunctional Diagram