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參數(shù)資料
| 型號： | HD74HC221FPEL |
| 元件分類： | 諧振器 |
| 英文描述： | HC/UH SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16 |
| 封裝： | 5.50 X 10.06 MM, 1.27 MM PITCH, PLASTIC, SOP-16 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 114K |
| 代理商： | HD74HC221FPEL |
HD74HC221
Rev.2.00 Jan 31, 2006 page 4 of 7
Switching Characteristics
(C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Ta = 25°C
Min
Typ
—
—
—
—
—
—
—
—
—
—
—
—
80
16
14
—
—
450
—
380
0.63
Ta = –40 to +85°C
Min
—
—
—
—
—
—
—
—
—
—
—
—
100
20
17
—
—
—
—
Item
Symbol V
CC
(V)
Max
210
42
36
240
48
41
170
34
29
180
36
31
—
—
—
—
—
—
0.77
Max
265
53
45
300
60
51
215
43
37
225
45
38
—
—
—
—
—
—
—
Unit
Test Conditions
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
1.5
t
PLH
ns
A, B or Clear to Q
Trigger
propagation delay
time
t
PHL
ns
A, B or Clear to
Q
t
PHL
ns
Clear to Q
Propagation delay
time
t
PLH
ns
Clear to
Q
Pulse width
t
w
ns
A, B, Clear
μ
s
ns
Rext = 6 k
Rext = 2 k
Minimum output
pulse width
t
WQ (min)
Cext = 28 pF
Output pulse width
t
WQ
0.7
ms Cext = 0.1 μF
Rext = 10 k
ns
2.0
4.5
6.0
—
—
—
—
—
—
—
—
5
75
15
13
10
—
—
—
—
95
19
16
10
Output rise/fall
time
t
TLH
t
THL
Input capacitance
Caution in use:
Cin
pF
In order to prevent any malfunctions due to noise, connect a high-frequency performance capacitor
between V
CC
and GND, and keep the wiring between the external components and Cext, Rext/Cext
pins as short as possible.
Test Circuit
V
CC
C =
50 pF
V
CC
Output
Q
Rext/Cext
Cext
Clear
Q
Z
out
= 50
Input A
Z
out
= 50
Input B
Z
out
= 50
Input Clear
C =
50 pF
Output
Rext
Cext
Note : 1. C
L
includes probe and jig capacitance.
S
Pulse Generator
Pulse Generator
Pulse Generator
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