Texas Instruments CD74HCT688M Manual

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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.

Produkt Specifikationer

Mærke:	Texas Instruments
Kategori:	Ikke kategoriseret
Model:	CD74HCT688M
Type:	Logisk kredsløb
Bredde:	13 mm
Dybde:	7.6 mm
Højde:	2.35 mm
Antal pr. pakke:	25 stk
Pakkedybde:	507 mm
Pakkebredde:	12.83 mm
Pakkehøjde:	5.08 mm
Opbevaringstemperatur (T-T):	-65 - 150 °C
Driftstemperatur (T-T):	-55 - 125 °C
Pakketype:	SOIC
Antal stifter:	20
Bredde (med stifter):	13 mm
Højde (med stifter):	2.65 mm
Dybde (med stifter):	10.63 mm