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參數(shù)資料
| 型號： | HD74HC221 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Dual Monostable Multivibrators (with Schmitt Trigger Input) |
| 中文描述： | 雙（與施密特觸發(fā)輸入單穩(wěn)態(tài)多頻振蕩器） |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 53K |
| 代理商： | HD74HC221 |
HD74HC221
4
AC Characteristics
(C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Ta = 25
°
C
Ta = –40 to
+85
°
C
Item
Symbol
V
CC
(V)
2.0
Min Typ Max Min
Max
Unit
Test Conditions
Trigger
t
PLH
—
—
210 —
265
ns
A, B or Clear to Q
propagation delay
4.5
—
—
42
—
53
time
6.0
—
—
36
—
45
t
PHL
2.0
—
—
240 —
300
ns
A, B or Clear to
Q
4.5
—
—
48
—
60
6.0
—
—
41
—
51
Propagation delay t
PHL
time
2.0
—
—
170 —
215
ns
Clear to Q
4.5
—
—
34
—
43
6.0
—
—
29
—
37
t
PLH
2.0
—
—
180 —
225
ns
Clear to
Q
4.5
—
—
36
—
45
6.0
—
—
31
—
38
Pulse width
t
w
2.0
80
—
—
100
—
ns
A, B, Clear
4.5
16
—
—
20
—
6.0
14
—
—
17
—
Minimum output
t
WQ (min)
2.0
—
1.5
—
—
—
μ
s
Cext = 28 pF
Rext = 6 k
Rext = 2 k
pulse width
4.5
—
450 —
—
—
ns
6.0
—
380 —
—
—
Output pulse width t
WQ
4.5
0.63 0.7
0.77 —
—
ms
Cext = 0.1
μ
F
Rext = 10 k
Output rise/fall
t
TLH
t
THL
2.0
—
—
75
—
95
ns
time
4.5
—
—
15
—
19
6.0
—
—
13
—
16
Input capacitance
Caution in use:
Cin
—
—
5
10
—
10
pF
In order to prevent any malfunctions due to noise, connect a high-frequency performance
capacitor between V
and GND, and keep the wiring between the external components
and Cext, Rext/Cext pins as short as possible.
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