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參數(shù)資料
| 型號： | 74LS221N |
| 廠商： | Motorola, Inc. |
| 英文描述： | DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS |
| 中文描述： | 雙單穩(wěn)多諧振蕩器與施密特觸發(fā)輸入 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 120K |
| 代理商： | 74LS221N |
SN74LS221
http://onsemi.com
5
AC CHARACTERISTICS
(V
CC
= 5.0 V, T
A
= 25
°
C)
From
(Input)
To
Limits
Symbol
(Output)
Min
Typ
Max
Unit
Test Conditions
t
PLH
A
Q
45
70
ns
B
Q
35
55
t
PHL
A
Q
50
80
ns
C
ext
= 80 pF, R
ext
= 2.0
= 80 pF R
= 2 0
B
Q
40
65
t
PHL
Clear
Q
35
55
ns
C
= 15 pF,
L
See Figure 1
t
PLH
Clear
Q
44
65
ns
70
120
150
C
ext
= 80 pF, R
ext
= 2.0
t
W(out)
A or B
Q or Q
20
47
70
ns
C
ext
= 0, R
ext
= 2.0 k
600
670
750
C
ext
= 100 pF, R
ext
= 10 k
6.0
6.9
7.5
ms
C
ext
= 1.0
μ
F, R
ext
= 10 k
AC SETUP REQUIREMENTS
(V
CC
= 5.0 V, T
A
= 25
°
C)
Limits
Symbol
Parameter
Min
Typ
Max
Unit
Rate of Rise or Fall of Input Pulse
dv/dt
Schmitt, B
1.0
V/s
Logic Input, A
1.0
V/
μ
s
Input Pulse Width
t
W
A or B, t
W(in)
Clear, t
W
(clear)
40
ns
40
t
s
Clear-Inactive-State Setup Time
15
ns
R
ext
External Timing Resistance
1.4
100
k
C
ext
External Timing Capacitance
0
1000
μ
F
Output Duty Cycle
RT = 2.0 k
50
%
R
T
= MAX R
ext
90
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