74HC14D datasheet(10/21 Pages) NXP

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74HC_HCT14

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Product data sheet

Rev. 6 — 19 September 2012

10 of 21

NXP Semiconductors

74HC14; 74HCT14

Hex inverting Schmitt trigger

15. Application information

The slow input rise and fall times cause additional power dissipation, this can be

calculated using the following formula:

Padd =fi  (tr ICC(AV) +tf ICC(AV))  VCC where:

Padd = additional power dissipation (W);

fi = input frequency (MHz);

tr =rise time (ns); 10 %to90%;

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

I

CC(AV) = average additional supply current (A).

Average

I

CC(AV) differs with positive or negative input transitions, as shown in Figure 12

and Figure 13.

An example of a relaxation circuit using the 74HC14; 74HCT14 is shown in Figure 14.

a. VCC =4.5 V

b. VCC =5.5 V

Fig 11. Typical 74HCT transfer characteristics

1.5

0.3

0.6

0.9

1.2

mna849

ICC

(mA)

VI (V)

1.8

0.6

0.3

1.2

1.5

0.9

mna850

ICC

(mA)

VI (V)

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