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74AHC3G14 Datasheet PDF : 15 Pages
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Nexperia
74AHC3G14; 74AHCT3G14
Triple inverting Schmitt trigger
13. Application information
The slow input rise and fall times cause additional power dissipation, which can be calculated using
the following formula:
Padd = fi x (tr x ΔICC(AV) + tf x ΔICC(AV)) × VCC where:
Padd = additional power dissipation (μW);
fi = input frequency (MHz);
tr = input rise time (ns); 10 % to 90 %;
tf = input fall time (ns); 90 % to 10 %;
ΔICC(AV) = average additional supply current (μA).
ΔICC(AV) differs with positive or negative input transitions, as shown in Fig. 15 and Fig. 16.
For 74AHC3G14 and 74AHCT3G14 used in relaxation oscillator circuit, see Fig. 17.
Note to the application information:
1. All values given are typical unless otherwise specified.
200
ΔICC(AV)
(µA)
150
100
mna036
positive-going
edge
200
ΔICC(AV)
(µA)
150
100
mna058
positive-going
edge
50
50
negative-going
edge
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 additional ICC for 74AHC3G14 Schmitt
trigger devices
0
0
2
4 VCC (V) 6
Linear change of VI between 0.1VCC to 0.9VCC
Fig. 16. Average additional ICC for 74AHCT3G14 Schmitt
trigger devices
R
C
mna035
For 74AHC3G14:
For 74AHCT3G14:
Fig. 17. Relaxation oscillator using the 74AHC3G14 and 74AHCT3G14
74AHC_AHCT3G14
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 9 — 4 December 2018
© Nexperia B.V. 2018. All rights reserved
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