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CDx4HC688, CDx4HCT688 High-Speed CMOS Logic 8-Bit Magnitude Comparator

1 Features

• Cascadable

• Fanout (over temperature range)

– Standard outputs: 10 LSTTL Loads

– Bus driver outputs: 15 LSTTL Loads

• Wide operating temperature range: –55 to 125℃ ℃

• Balanced propagation delay and transition times

• Significant power reduction compared to LSTTL

Logic ICs

• HC types

– 2 V to 6 V operation

– High noise immunity: NIL = 30%, NIH = 30% of

VCC at VCC = 5 V

• HCT types

– 4.5 V to 5.5 V operation

– Direct LSTTL input logic compatibility,

VIL = 0.8 V (max), VIH = 2 V (min)

– CMOS input compatibility, II ≤ 1 μA at VOL,VOH

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.

Device 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.

Functional Diagram

CD54HC688, CD74HC688, CD54HCT688, CDHCT688

SCHS196D – SEPTEMBER 1997 – REVISED FEBRUARY 2022

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Table of Contents

1 Features............................................................................1

2 Description.......................................................................1

3 Revision History.............................................................. 2

4 Pin Configuration and Functions...................................3

5 Specifications.................................................................. 4

5.1 Absolute Maximum Ratings(1) ....................................4

5.2 Recommended Operating Conditions.........................4

5.3 Thermal Information....................................................4

5.4 Electrical Characteristics.............................................5

5.5 Switching Characteristics............................................6

6 Parameter Measurement Information............................ 7

7 Detailed Description........................................................8

7.1 Overview.....................................................................8

7.2 Functional Block Diagram........................................... 8

7.3 Device Functional Modes............................................8

8 Power Supply Recommendations..................................9

9 Layout...............................................................................9

9.1 Layout Guidelines....................................................... 9

10 Device and Documentation Support..........................10

10.1 Receiving Notification of Documentation Updates..10

10.2 Support Resources................................................. 10

10.3 Trademarks.............................................................10

10.4 Electrostatic Discharge Caution..............................10

10.5 Glossary..................................................................10

11 Mechanical, Packaging, and Orderable

Information.................................................................... 10

3 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision C (August 2003) to Revision D (February 2022) Page

• Updated the numbering, formatting, tables, figures, and cross-references throughout the doucment to reflect

modern data sheet standards.............................................................................................................................1

CD54HC688, CD74HC688, CD54HCT688, CDHCT688

SCHS196D – SEPTEMBER 1997 – REVISED FEBRUARY 2022 www.ti.com