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參數(shù)資料
| 型號(hào)： | 7493 |
| 廠(chǎng)商： | National Semiconductor Corporation |
| 元件分類(lèi)： | 通用總線(xiàn)功能 |
| 英文描述： | Decade and Binary Counters |
| 中文描述： | 十年和二進(jìn)制計(jì)數(shù)器 |
| 文件頁(yè)數(shù)： | 2/10頁(yè) |
| 文件大?。?/td> | 133K |
| 代理商： | 7493 |
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
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
DM5490
DM7490A
Units
Min
Nom
Max
Min
Nom
Max
V
CC
V
IH
V
IL
I
OH
I
OL
f
CLK
Supply Voltage
4.5
5
5.5
4.75
5
5.25
V
High Level Input Voltage
2
2
V
Low Level Input Voltage
0.8
0.8
V
High Level Output Current
b
0.8
b
0.8
mA
Low Level Output Current
16
16
mA
Clock Frequency
(Note 5)
A
0
32
0
32
MHz
B
0
16
0
16
t
W
Pulse Width
(Note 5)
A
15
15
B
30
30
ns
Reset
15
15
t
REL
T
A
Reset Release Time (Note 5)
25
25
ns
§
C
Free Air Operating Temperature
b
55
125
0
70
’90A 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
V
CC
e
Min, I
OH
e
Max
V
IL
e
Max, V
IH
e
Min
V
CC
e
Min, I
OL
e
Max
V
IH
e
Min, V
IL
e
Max (Note 4)
V
CC
e
Max, V
I
e
5.5V
b
1.5
V
V
OH
High Level Output
Voltage
2.4
3.4
V
V
OL
Low Level Output
Voltage
0.2
0.4
V
I
I
Input Current
@
Max
Input Voltage
1
mA
I
IH
High Level Input
Current
V
CC
e
Max
V
I
e
2.7V
A
80
Reset
40
m
A
B
120
I
IL
Low Level Input
Current
V
CC
e
Max
V
I
e
0.4V
A
b
3.2
Reset
b
1.6
mA
B
b
4.8
I
OS
Short Circuit
Output Current
V
CC
e
Max
(Note 2)
DM54
b
20
b
57
mA
DM74
b
18
b
57
I
CC
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.
Supply Current
V
CC
e
Max (Note 3)
29
42
mA
Note 3:
I
CC
is measured with all outputs open, both RO inputs grounded following momentary connection to 4.5V, and all other inputs grounded.
Note 4:
Q
A
outputs are tested at I
OL
e
Max plus the limit value of I
IL
for the B input. This permits driving the B input while maintaining full fan-out capability.
Note 5:
T
A
e
25
§
C and V
CC
e
5V.
2
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