74HCT14 Philips, 74HCT14 Datasheet - Page 8

• Manufacturer Part Number: 74HCT14
• 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:
Average I
transitions, as shown in Figs 14 and 15.
HC/HCT14 used in a relaxation oscillator circuit, see
Fig.16.
September 1993
P
f
t
t
I
ad
i
r
f
CCa
ad
Hex inverting Schmitt trigger
Fig.14 Average I
= f
Fig.16 Relaxation oscillator using HC/HCT14.
HC : f
i
HCT : f
= additional power dissipation ( W)
= input frequency (MHz)
= input rise time ( s); 10%
= input fall time ( s); 10%
= average additional supply current ( A)
(t
CCa
r
linear change of V
0.9 V
=
=
-- -
T
1
differs with positive or negative input
I
1
-- -
T
CCa
------------------ -
0.8 RC
CC
--------------------- -
0.67 RC
1
+ t
1
CC
f
for HC Schmitt trigger devices;
I
CCa
)
i
between 0.1 V
V
CC
.
90%
90%
CC
to
8
Note to Application information
All values given are typical unless otherwise specified.
PACKAGE OUTLINES
See
Fig.15 Average I
“74HC/HCT/HCU/HCMOS Logic Package Outlines”
linear change of V
0.9 V
CC
.
CC
for HCT Schmitt trigger devices;
i
between 0.1 V
74HC/HCT14
Product specification
CC
to
.