74AHCT1G14 查看數據表（PDF） - Nexperia B.V. All rights reserved

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74AHCT1G14

Inverting Schmitt trigger

Nexperia B.V. All rights reserved 

Nexperia

74AHC1G14; 74AHCT1G14

Inverting Schmitt trigger

12.1. Waveform and test circuit

A input

VM

tPHL

tPLH

Y output

VM

The test data is given in Table 10

mna033

Fig. 12. The input (A) to output (Y) propagation delays

VCC

PULSE

VI

GENERATOR

VO

DUT

RT

CL

mna101

Test data is given in Table 9.

Definitions for test circuit:

CL = Load capacitance.

RT = Termination resistance should be equal to

output impedance Zo of the pulse generator.

Fig. 13. Test circuit for measuring switching times

Table 10. Test data

Type number

74AHC1G14

74AHCT1G14

Input

VI

GND to VCC

GND to 3.0 V

VM

0.5 x VCC

1.5 V

Output

VM

0.5 x VCC

0.5 x VCC

13. Application information

The slow input rise and fall times cause additional power dissipation, which can be calculated using

the following formula:

Padd = fi x (tr x ΔICC(AV) + tf x ΔICC(AV)) x VCC where:

• Padd = additional power dissipation (μW);

• fi = input frequency (MHz);

• tr = input rise time (ns); 10 % to 90 %;

• tf = input fall time (ns); 90 % to 10 %;

• ΔICC(AV) = average additional supply current (μA).

Average additional ICC differs with positive or negative input transitions, as shown in Fig. 14 and

Fig. 15.

For 74AHC1G14 and 74AHCT1G14 used in relaxation oscillator circuit, see Fig. 16.

Note to the application information:

• All values given are typical unless otherwise specified.

74AHC_AHCT1G14

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 9 — 3 April 2020

© Nexperia B.V. 2020. All rights reserved

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