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74HC_HCT2G14

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Product data sheet

Rev. 2 — 14 March 2014

13 of 21

Nexperia

74HC2G14; 74HCT2G14

Dual inverting Schmitt trigger

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

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

I

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

I

CC(AV) differs with positive or negative input transitions, as shown in Figure 11 and

Figure 12.

An example of a relaxation circuit using the 74HC2G14/74HCT2G14 is shown

in Figure 13.

(1) Positive-going edge.

(2) Negative-going edge.

Fig 11.

I

CC(AV) as a function of VCC for 74HC2G14; linear change of VI between 0.1VCC to 0.9VCC

mna036

0

2.0

4.0

6.0

VCC (V)

200

150

50

0

100

∆ICC(AV)

(

µA)

positive-going

edge

negative-going

edge