74hct3g14 NXP Semiconductors, 74hct3g14 Datasheet - Page 16

• Manufacturer Part Number: 74hct3g14
• Description: Inverting Schmitt-triggers
• Manufacturer: NXP Semiconductors

Philips Semiconductors
APPLICATION INFORMATION
Power dissipation
The slow input rise and fall times cause additional power
dissipation. This can be calculated using the following
formula:
P
Where:
Average I
transitions, as shown in Fig.14 and Fig.15.
Relaxation oscillator
A relaxation oscillator circuit using the HC3G14/HCT3G14
is shown in Fig.16.
Remark to the application information
All values given are typical unless otherwise specified.
2003 Nov 04
handbook, halfpage
ad
P
f
t
t
I
Inverting Schmitt-triggers
i
r
f
CC(AV)
I CC(AV)
Linear change of V
Fig.15 Average I
ad
= input frequency (MHz)
= input fall time between 90% and 10% (ns);
= f
= input rise time between 10% and 90% (ns);
( A)
= additional power dissipation ( W)
200
150
100
i
50
0
= average additional supply current ( A).
(t
0
CC(AV)
r
devices.
I
CC(AV)
differs with positive or negative input
CC
+ t
2
I
between 0.1V
f
for HCT Schmitt-trigger
I
CC(AV)
)
positive-going
4
negative-going
V
edge
CC
CC
V CC (V)
to 0.9V
edge
MNA058
CC
6
.
16
handbook, halfpage
handbook, halfpage
I CC(AV)
Linear change of V
Fig.14 Average I
For HC3G:
For HCT3G:
Fig.16 Relaxation oscillator using the
( A)
200
150
100
50
0
0
HC3G/HCT3G14.
f
f
=
=
1
-- -
T
1
-- -
T
74HC3G14; 74HCT3G14
---------------------- -
0.8
-------------------------- -
0.67 RC
CC
1
2.0
I
RC
C
1
between 0.1V
for HC Schmitt-trigger devices.
R
MNA035
4.0
positive-going
negative-going
Product specification
CC
edge
V CC (V)
edge
to 0.9V
MNA036
CC
6.0
.