74AHC3G14GM 查看數據表（PDF） - Philips Electronics

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74AHC3G14GM

Inverting Schmitt trigger

Philips Electronics 

Philips Semiconductors

Inverting Schmitt trigger

Product specification

74AHC3G14; 74AHCT3G14

APPLICATION INFORMATION

The slow input rise and fall times cause additional power

dissipation. This can be calculated using the following

formula:

Pad = fi × (tr × ICC(AV) + tf × ICC(AV)) × VCC

Where:

Pad = additional power dissipation (µW);

fi = input frequency (MHz);

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

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

ICC(AV) = average additional supply current (µA).

Average ICC differs with positive or negative input

transitions, as shown in Figs 15 and 16.

For AHC3G/AHCT3G14 used in relaxation oscillator

circuit, see Fig.17.

Remark to the application information

All values given are typical unless otherwise specified.

handboo2k,0h0alfpage

ICC(AV)

(µA)

150

100

MNA036

positive-going

edge

50

negative-going

edge

0

0

2.0

4.0

6.0

VCC (V)

Linear change of VI between 0.1VCC to 0.9VCC.

Fig.15 Average ICC for AHC3G Schmitt-trigger

devices.

200

handbook, halfpage

ICC(AV)

(µA)

150

100

50

MNA058

positive-going

edge

negative-going

edge

handbook, halfpage

R

C

MNA035

0

0

2

4 VCC (V) 6

Linear change of VI between 0.1VCC to 0.9VCC.

Fig.16 Average ICC for AHCT3G Schmitt-trigger

devices.

For AHC3G: f = T-1-- ≈ 0----.-5----5---1--×----R-----C---

For AHCT3G: f = T-1-- ≈ 0----.-6----0---1--×----R-----C---

Fig.17 Relaxation oscillator using the

AHC3G/AHCT3G14.

2004 Oct 18

16

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