74hct3g14 NXP Semiconductors, 74hct3g14 Datasheet - Page 16
74hct3g14
Manufacturer Part Number
74hct3g14
Description
Inverting Schmitt-triggers
Manufacturer
NXP Semiconductors
Datasheet
1.74HCT3G14.pdf
(20 pages)
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
.