74VHC_VHCT14_15 datasheet(7/16 Pages) PHILIPS

Teilenummer	74VHC_VHCT14

Bauteilbeschribung	Hex inverting Schmitt trigger

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7 / 16 page

74VHC_VHCT14_1

Product data sheet

Rev. 01 — 17 August 2009

7 of 16

NXP Semiconductors

74VHC14; 74VHCT14

Hex inverting Schmitt trigger

11. Waveforms

Measurement points are given in Table 8.

VOL and VOH are typical voltage output levels that occur with the output load.

Fig 6.

Input to output propagation delays

mna344

tPHL

tPLH

VM

nA input

nY output

GND

VI

VOH

VOL

Table 8.

Measurement points

Type

Input

Output

VM

74VHC14

0.5VCC

74VHCT14

1.5 V

0.5VCC

Test data is given in Table 9.

Deﬁnitions test circuit:

RT = Termination resistance should be equal to output impedance Zo of the pulse generator

CL = Load capacitance including jig and probe capacitance

Fig 7.

Load circuitry for measuring switching times

001aah768

tW

tr

tf

VM

VI

negative

pulse

GND

VI

positive

pulse

GND

10 %

90 %

10 %

VM

tf

VCC

DUT

RT

VI

VO

CL

G

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