74HC688DB datasheet(2/7 Pages) PHILIPS

2 / 7 page

December 1990

Philips Semiconductors

Product speciﬁcation

8-bit magnitude comparator

74HC/HCT688

FEATURES

• Compare two 8-bit words

• Output capability: standard

• ICC category: MSI

GENERAL DESCRIPTION

The 74HC/HCT688 are high-speed Si-gate CMOS devices

and are pin compatible with low power Schottky TTL

(LSTTL). They are specified in compliance with JEDEC

standard no. 7A.

The 74HC/HCT688 are 8-bit magnitude comparators.

They perform comparison of two 8-bit binary or BCD

words.

The output provides P = Q.

QUICK REFERENCE DATA

GND = 0 V; Tamb =25 °C; tr =tf = 6 ns

Notes

1. CPD is used to determine the dynamic power dissipation (PD in µW):

PD =CPD × VCC2 × fi + ∑ (CL × VCC2 × fo)

where:

fi = input frequency in MHz

fo = output frequency in MHz

∑ (CL × VCC2 × fo) = sum of outputs

CL = output load capacitance in pF

VCC = supply voltage in V

2. For HC the condition is VI = GND to VCC

For HCT the condition is VI = GND to VCC − 1.5 V

ORDERING INFORMATION

See

“74HC/HCT/HCU/HCMOS Logic Package Information”.

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

HCT

tPHL/ tPLH

propagation delay

CL = 15 pF; VCC =5 V

Pn, Qn to P = Q

1717ns

E to P = Q

input capacitance

3.5

CPD

power dissipation capacitance per package

notes 1 and 2

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