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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 NUMBERPACKAGE(1) BODY SIZE (NOM)

CD74HC688MSOIC (20)12.80 mm × 7.50 mm

CD74HCT688MSOIC (20)12.80 mm × 7.50 mm

CD74HC688EPDIP (20)25.40 mm × 6.35 mm

CD74HCT688EPDIP (20)25.40 mm × 6.35 mm

CD74HC688NSRSO (20)15.00 mm × 5.30 mm

CD74HC688PWRTSSOP (20)6.50 mm × 4.40 mm

CD54HC688F3ACDIP (20)26.92 mm × 6.92 mm

CD54HCT688F3ACDIP (20)26.92 mm × 6.92 mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

Y

E

A0

B0

A1

B1

A2

B2

A3

B3

A4

B4

A5

B5

A6

B6

A7

B7

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.

Produktspecifikationer