1

Data sheet acquired from Harris Semiconductor

SCHS196

Features

• Cascadable

• Fanout (Over Temperature Range)

- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads

- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

• Balanced Propagation Delay and Transition Times

• Significant Power Reduction Compared to LSTTL

Logic ICs

• HC Types

- 2V to 6V Operation

• HCT Types

- 4.5V to 5.5V Operation

- Direct LSTTL Input Logic Compatibility,

Description

The Harris CD74HC688 and CD74HCT688 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.

Pinout

CD74HC688, CD74HCT688

(PDIP, SOIC)

TOP VIEW

Ordering Information

PART NUMBER

PACKAGE

PKG.

NO.

CD74HC688E

-55 to 125

20 Ld PDIP

E20.3

CD74HCT688E

-55 to 125

20 Ld PDIP

E20.3

CD74HC688M

-55 to 125

20 Ld SOIC

M20.3

CD74HCT688M

-55 to 125

20 Ld SOIC

M20.3

CD54HC688

-55 to 125

Wafer

NOTES:

1. When ordering, use the entire part number. Add the suffix 96 to

obtain the variant in the tape and reel.

2. Die for this part number is available which meets all electrical

specifications. Please contact your local sales office or Harris

customer service for ordering information.

11

12

13

14

15

16

17

18

20

19

10

9

8

7

6

5

4

3

2

1

E

A0

B0

A1

B1

A2

A3

B2

B3

GND

B7

A7

B6

Y

A6

B5

A5

B4

A4

September 1997

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.

Copyright

File Number

1646.1

CD74HC688,

CD74HCT688

High Speed CMOS Logic

8-Bit Magnitude Comparator

[ /Title

(CD74

HC688

,

CD74

HCT68

8)

/Sub-

ject

(High

Speed

CMOS