74HC14D datasheet(7/21 Pages) NXP

7 / 21 page

74HC_HCT14

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Product data sheet

Rev. 6 — 19 September 2012

7 of 21

NXP Semiconductors

74HC14; 74HCT14

Hex inverting Schmitt trigger

12. 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

mna722

tPLH

tPHL

90 %

10 %

nY output

nA input

GND

VOH

VOL

tTLH

tTHL

Table 8.

Measurement points

Type

Input

Output

74HC14

0.5VCC

0.1VCC

0.9VCC

74HCT14

1.3 V

0.1VCC

0.9VCC

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

negative

pulse

GND

positive

pulse

GND

10 %

90 %

10 %

VCC

DUT

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