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Fabricante

74LV14PW

Hex inverting Schmitt trigger

NXP Semiconductors. 

NXP Semiconductors

74LV14

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 (µW);

fi = input frequency (MHz);

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

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

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

Average ∆ICC(AV) differs with positive or negative input transitions, as shown in Figure 13.

An example of a relaxation circuit using the 74LV14 is shown in Figure 14.

100

∆ICC(AV)

(µA)

75

50

001aah097

(1)

(2)

25

0

1.0

1.5

2.0

2.5

3.0

VCC (V)

(1) Positive-going edge.

(2) Negative-going edge.

Fig 13. Average additional supply current as a function of VCC

R

f = T-1-- ≈ 0---.--8----×-1----R----C---

Fig 14. Relaxation oscillator

74LV14_3

Product data sheet

C

mna035

Rev. 03 — 20 December 2007

© NXP B.V. 2007. All rights reserved.

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