74HCT 查看數據表（PDF） - Philips Electronics

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74HCT

FAMILY SPECIFICATIONS HCMOS family characteristics

Philips Electronics 

Philips Semiconductors

HCMOS family characteristics

Test circuit for 74HC

FAMILY SPECIFICATIONS

handbook, full pagewidth

VI

PULSE

GENERATOR

VCC

D.U.T

RT

VCC

VO

RL = 1 kΩ

CL 50 pF

MGK563

Switch position

TEST

tPZH

tPZL

tPHZ

tPLZ

SWITCH

GND

VCC

GND

VCC

Note

1. For open-drain N-channel outputs tPLZ and tPZL are applicable.

CL = load capacitance including jig and probe capacitance

(see AC CHARACTERISTICS for values).

RT = termination resistance should be equal to the output impedance Zo of

the pulse generator.

Fig.7 Test circuit for 3-state outputs.

HCT TYPES

AC waveforms 74HCT

handbook, halfpage

INPUT

tr

10%

tPHL

90%

1.3 V

tf

3V

tPLH

GND

OUTPUT

90%

1.3 V

10%

tTHL

tTLH

MGK567

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

March 1988

12

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