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參數(shù)資料
| 型號： | 74191 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Synchronous 4-Bit Up/Down Counter with Mode Control |
| 中文描述： | 同步4位加/減計數(shù)器的模式控制 |
| 文件頁數(shù)： | 2/6頁 |
| 文件大小： | 129K |
| 代理商： | 74191 |
Absolute Maximum Ratings
(Note)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage
7V
Input Voltage
5.5V
Operating Free Air Temperature Range
DM54 and 54
DM74
b
55
§
C to
a
125
§
C
0
§
C to
a
70
§
C
b
65
§
C to
a
150
§
C
Storage Temperature Range
Note: The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed. The device should not be operated at these limits. The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation.
Recommended Operating Conditions
Symbol
Parameter
DM54191
DM74191
Units
Min
Nom
Max
Min
Nom
Max
V
CC
Supply Voltage
4.5
5
5.5
4.75
5
5.25
V
V
IH
High Level Input Voltage
2
2
V
V
IL
Low Level Input Voltage
0.8
0.8
V
I
OH
High Level Output Current
b
0.8
b
0.8
mA
I
OL
Low Level Output Current
16
16
mA
f
CLK
Clock Frequency (Note 4)
0
20
0
20
MHz
t
W
Pulse Width
(Note 4)
Clock
25
25
ns
Load
35
35
t
SU
Data Setup Time (Note 4)
28
28
ns
t
H
Hold Time (Note 4)
0
0
ns
t
REL
Load Release Time (Note 4)
30
30
ns
T
A
Free Air Operating Temperature
b
55
125
0
70
§
C
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 1)
V
I
Input Clamp Voltage
V
CC
e
Min, I
I
e b
12 mA
b
1.5
V
V
OH
High Level Output
Voltage
V
CC
e
Min, I
OH
e
Max
V
IL
e
Max, V
IH
e
Min
2.4
3.4
V
V
OL
Low Level Output
Voltage
V
CC
e
Min, I
OL
e
Max
V
IH
e
Min, V
IL
e
Max
0.2
0.4
V
I
I
Input Current
@
Max
Input Voltage
V
CC
e
Max, V
I
e
5.5V
1
mA
I
IH
High Level Input
Current
V
CC
e
Max
V
I
e
2.4V
Enable
120
m
A
Others
40
I
IL
Low Level Input
Current
V
CC
e
Max
V
I
e
0.4V
Enable
b
4.8
mA
Others
b
1.6
I
OS
Short Circuit
Output Current
V
CC
e
Max
(Note 2)
DM54
b
20
b
65
mA
DM74
b
18
b
65
I
CC
Supply Current
V
CC
e
Max
(Note 3)
DM54
65
99
mA
DM74
65
105
Note 1:
All typicals are at V
CC
e
5V, T
A
e
25
§
C.
Note 2:
Not more than one output should be shorted at a time.
Note 3:
I
CC
is measured with all inputs grounded and all outputs open.
Note 4:
T
A
e
25
§
C and V
CC
e
5V.
2
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