March 1988

12

Philips Semiconductors

HCMOS family characteristics

FAMILY SPECIFICATIONS

Test circuit for 74HC

HCT TYPES

AC waveforms 74HCT

handbook, full pagewidth

MGK563

D.U.T

VCC

VCC

VI

VO

RT

RL = 1 kΩ

CL

50 pF

PULSE

GENERATOR

Switch position

Note

TEST

SWITCH

GND

GND

Fig.7 Test circuit for 3-state outputs.

=

load capacitance including jig and probe capacitance

(see AC CHARACTERISTICS for values).

=

the pulse generator.

Fig.8 Input rise and fall times, transition times and propagation delays for combinatorial logic ICs.

handbook, halfpage

MGK567

10%

90%

90%

1.3 V

1.3 V

INPUT

OUTPUT

tr

tf

tPHL

tTHL

tPLH

tTLH

10%

GND

3 V