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74HC688D,653

8-bit magnitude comparator

NXP Semiconductors. 

Philips Semiconductors

8-bit magnitude comparator

Product specification

74HC/HCT688

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.

Output capability: standard

ICC category: MSI

Note to HCT types

The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.

To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.

INPUT

Pn

Qn

E

UNIT LOAD COEFFICIENT

0.35

0.35

0.70

AC CHARACTERISTICS FOR 74HCT

GND = 0 V; tr = tf = 6 ns; CL = 50 pF

Tamb (°C)

TEST CONDITIONS

SYMBOL PARAMETER

74HCT

+25

−40 to +85

−40 to +125

UNIT

VCC

(V)

WAVEFORMS

min. typ. max. min. max. min. max.

tPHL/ tPLH

tPHL/ tPLH

propagation delay

Pn, Qn to P = Q

propagation delay

E to P = Q

20 34

43

51 ns 4.5 Fig.6

18 24

30

36 ns 4.5 Fig.7

tTHL/ tTLH output transition time

7 15

19

22 ns 4.5 Figs 6 and 7

December 1990

6

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