74hct1g14 NXP Semiconductors, 74hct1g14 Datasheet - Page 11

• Manufacturer Part Number: 74hct1g14
• Description: Inverting Schmitt-trigger
• Manufacturer: NXP Semiconductors

Philips Semiconductors
APPLICATION INFORMATION
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.
HC1G/HCT1G14 used in relaxation oscillator circuit,
see Fig.14 and Fig.16.
Note to the application information:
1. All values given are typical unless otherwise specified.
2002 May 15
handbook, halfpage
ad
P
f
t
t
I
Inverting Schmitt-triggers
i
r
f
CCa
I CC(AV)
Fig.15 Average I
ad
= input frequency (MHz)
= input fall time (ns); 90% to 10%
= f
= input rise time (ns); 10% to 90%
( A)
= additional power dissipation ( W)
200
150
100
i
= average additional supply current ( A).
50
0
(t
0
CCa
r
devices; linear change of V
0.1V
differs with positive or negative input
I
CCa
CC
+ t
to 0.9V
CC
f
2
for HCT1G Schmitt-trigger
I
CCa
CC
)
.
V
CC
positive-going
4
negative-going
edge
I
V CC (V)
between
edge
MNA058
6
11
handbook, halfpage
handbook, halfpage
I CC(AV)
Fig.14 Average I
For HC1G:
For HCT1G:
Fig.16 Relaxation oscillator using the
( A)
200
150
100
50
0
0
devices; linear change of V
0.1V
HC1G/HCT1G14.
f
f
=
=
1
-- -
T
CC
1
-- -
T
74HC1G14; 74HCT1G14
---------------------- -
0.8
to 0.9V
-------------------------- -
0.67 RC
CC
1
2.0
RC
C
1
for HC1G Schmitt-trigger
CC
R
.
MNA035
4.0
positive-going
negative-going
Product specification
edge
I
V CC (V)
edge
between
MNA036
6.0