參數(shù)資料
型號: 74HCT1G14
廠商: NXP Semiconductors N.V.
英文描述: Inverting Schmitt-trigger(反相施密特觸發(fā)器)
中文描述: 反相施密特觸發(fā)器(反相施密特觸發(fā)器)
文件頁數(shù): 11/16頁
文件大?。?/td> 102K
代理商: 74HCT1G14
1998 Aug 05
11
Philips Semiconductors
Product specification
Inverting Schmitt-trigger
74HC1G14; 74HCT1G14
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
CCa
+ t
f
×
I
CCa
)
×
V
CC
Where:
P
ad
= additional power dissipation (
μ
W)
f
i
= input frequency (MHz)
t
r
= input rise time (ns); 10% to 90%
t
f
= input fall time (ns); 90% to 10%
I
CCa
= average additional supply current (
μ
A).
Average I
CCa
differs with positive or negative input
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.
Fig.14 Average I
CC
for HC1G Schmitt-trigger
devices; linear change of V
I
between
0.1V
CC
to 0.9V
CC
.
handbook, halfpage
average
ICC
(
μ
A)
0
2.0
4.0
6.0
VCC (V)
150
50
0
100
MNA036
positive-going
edge
negative-going
edge
Fig.15 Average I
CC
for HCT1G Schmitt-trigger
devices; linear change of V
I
between
0.1V
CC
to 0.9V
CC
.
handbook, halfpage
ICC
(
μ
A)
0
4
6
2
VCC (V)
100
50
150
0
MNA058
positive-going
edge
negative-going
edge
Fig.16 Relaxation oscillator using the
HC1G/HCT1G14.
For HC1G:
For HCT1G:
f
1
T
×
RC
0.8
=
f
1
T
×
RC
0.67
=
handbook, halfpage
MNA035
R
C
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