74LV14 Philips, 74LV14 Datasheet - Page 7

• Manufacturer Part Number: 74LV14
• Description: Hex inverting Schmitt-trigger
• Manufacturer: Philips

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:
P
f
t
t
Average I
shown in Figure 7.
1998 Apr 20
I
i
r
f
CC a
ad
ad
Figure 7. Average I
Hex inverting Schmitt-trigger
average
I CC
(mA)
= f
= additional power dissipation (mW)
= input frequency (MHz)
= input rise time (ns); 10% – 90%
= input fall time (ns); 10% – 90%
= average additional supply current (mA)
i
CC a
100
(t
change of V
75
50
25
differs with positive or negative input transitions, as
r
0
1.0
I
CCa
+ t
CC
f
I
1.5
for LV Schmitt-trigger devices; linear
between 0.1 V
I
CC a
)
V
positive-going
CC
2.0
.
edge
CC
V CC (V)
to 0.9 V
negative-going
2.5
edge
CC
SV00431
.
3.0
7
Note to application information:
All values given are typical unless otherwise specified.
Note to Figure 8
f + 1
T
[
Figure 8. Relaxation oscillator using the LV14.
0.8
1
C
RC
R
SV00433
Product specification
74LV14