74HC datasheet(14/19 Pages) PHILIPS

14 / 19 page

March 1988

Philips Semiconductors

HCMOS family characteristics

FAMILY SPECIFICATIONS

AC waveforms 74HCT (continued)

Test circuit for 74HCT

Fig.11 Propagation delays of 3-state outputs.

handbook, full pagewidth

MGK566

tPLZ

tPHZ

outputs

disabled

outputs

enabled

90%

10%

90%

1.3 V

outputs

enabled

OUTPUT

LOW-to-OFF

OFF-to-LOW

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

OUTPUT

ENABLE

tPZL

tPZH

1.3 V

Switch position

Note

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

TEST

SWITCH

tPZH

tPZL

tPHZ

tPLZ

GND

VCC

GND

VCC

Fig.12 Test circuit for 3-state outputs.

load capacitance including jig and probe capacitance

(see AC CHARACTERISTICS for values).

termination resistance should be equal to the output impedance Zo of

the pulse generator.

handbook, full pagewidth

MGK563

D.U.T

VCC

RL = 1 kΩ

50 pF

PULSE

GENERATOR

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