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7414

Hex inverting Schmitt trigger

Philips Electronics 

Philips Semiconductors

Hex inverting Schmitt trigger

Product specification

74HC14; 74HCT14

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 (µs); 10% to 90%;

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

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

ICC(AV) differs with positive or negative input transitions, as

shown in Figs 16 and 17.

For 74HC/HCT14 used in a relaxation oscillator circuit,

see Fig.18.

Note to application information

All values given are typical unless otherwise specified.

400

handbook, halfpage

ICC(AV)

(µA)

300

MNA852

200

100

0

0

positive - going

edge

negative - going

edge

2

4 VCC (V) 6

Linear change of VI between 0.1VCC to 0.9VCC

Fig.16 Average ICC for 74HC14 Schmitt trigger

devices.

400

handbook, halfpage

ICC(AV)

(µA)

300

200

100

MNA853

positive - going

egddge

negative - going

egddge

0

0

2

4 VCC (V) 6

Linear change of VI between 0.1VCC to 0.9VCC.

Fig.17 Average ICC for HCT Schmitt trigger

devices.

2003 Oct 30

handbook, halfpage

R

C

MNA854

74HC14 : f = T-1-- ≈ 0----.-8---1---R----C---

74HCT14 : f = T-1-- ≈ 0----.-6----7-1----R-----C--

Fig.18 Relaxation oscillator using 74HC/HCT14.

17

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