March 1988

9

Philips Semiconductors

HCMOS family characteristics

FAMILY SPECIFICATIONS

HCU TYPES

AC waveforms 74HCU

Test circuit for 74HCU

Fig.1 Input rise and fall times, transition times and propagation delays for combinatorial logic ICs.

handbook, halfpage

MGK564

10%

90%

90%

50%

50%

INPUT

OUTPUT

tr

tf

tPHL

tTHL

tPLH

tTLH

10%

GND

VCC

=

load capacitance including jig and probe capacitance

(see AC CHARACTERISTICS for values).

=

the pulse generator.

Fig.2 Test circuit.

handbook, halfpage

MGK565

PULSE

GENERATOR

D.U.T

VCC

VI

VO

RT

CL

50 pF