74HCT Просмотр технического описания (PDF) - Philips Electronics

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74HCT

FAMILY SPECIFICATIONS HCMOS family characteristics

Philips Electronics 

Philips Semiconductors

HCMOS family characteristics

FAMILY SPECIFICATIONS

Test circuit for 74HC

handbook, halfpage

VI

PULSE

GENERATOR

VCC

D.U.T

RT

VO

CL 50 pF

MGK565

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.5 Test circuit.

AC waveforms 74HC (continued)

handbook, full pagewidth

tf

OUTPUT

ENABLE

90%

50%

10%

tPLZ

OUTPUT

LOW-to-OFF

OFF-to-LOW

tPHZ

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

10%

90%

MGK562

outputs

enabled

tr

VCC

tPZL

50%

GND

tPZH

50%

outputs

disabled

outputs

enabled

Fig.6 Propagation delays of 3-state outputs.

March 1988

11

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