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參數(shù)資料
| 型號： | 74HC14 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Hex inverting Schmitt trigger |
| 中文描述： | 六反相施密特觸發(fā)器 |
| 文件頁數(shù)： | 17/23頁 |
| 文件大?。?/td> | 120K |
| 代理商： | 74HC14 |
2003 Oct 30
17
Philips Semiconductors
Product specification
Hex inverting Schmitt trigger
74HC14; 74HCT14
APPLICATION INFORMATION
The slow input rise and fall times cause additional power
dissipation. This can be calculated using the following
formula:
P
ad
= f
i
×
(t
r
×
I
CC(AV)
+ t
f
×
I
CC(AV)
)
×
V
CC
.
Where:
P
ad
= additional power dissipation (
μ
W);
f
i
= input frequency (MHz);
t
r
= input rise time (
μ
s); 10% to 90%;
t
f
= input fall time (
μ
s); 10% to 90%;
I
CC(AV)
= average additional supply current (
μ
A).
I
CC(AV)
differs with positive or negative input transitions, as
shown in Figs 16 and 17.
For 74HC/HCT14 used in a relaxation oscillator circuit,
see Fig.18.
Note to application information
All values given are typical unless otherwise specified.
handbook, halfpage
ICC(AV)
(
μ
A)
0
2
4
6
300
100
0
200
MNA852
VCC (V)
positive - going
edge
edge
negative - going
Fig.16 Average I
CC
for 74HC14 Schmitt trigger
devices.
Linear change of V
I
between 0.1V
CC
to 0.9V
CC
handbook, halfpage
ICC(AV)
(
μ
A)
0
2
4
6
300
100
0
200
MNA853
VCC (V)
egde
edge
positive - going
egde
edge
negative - going
Fig.17 Average I
CC
for HCT Schmitt trigger
devices.
Linear change of V
I
between 0.1V
CC
to 0.9V
CC
.
handbook, halfpage
MNA854
R
C
Fig.18 Relaxation oscillator using 74HC/HCT14.
74HC14 : f
1
T
0.8 RC
≈
=
74HCT14 : f
1
T
0.67 RC
≈
=
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