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參數(shù)資料
| 型號： | DM7490A |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Decade and Binary Counters(十進制和二進制計數(shù)器) |
| 中文描述： | 十年二進制計數(shù)器（十進制和二進制計數(shù)器） |
| 文件頁數(shù)： | 3/5頁 |
| 文件大?。?/td> | 47K |
| 代理商： | DM7490A |
3
www.fairchildsemi.com
D
Absolute Maximum Ratings
(Note 3)
Note 3:
The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Note 4:
T
A
=
25
°
C and V
CC
=
5V.
DC Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 5:
All typicals are at V
CC
=
5V, T
A
=
25
°
C.
Note 6:
Q
A
outputs are tested at I
OL
=
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 7:
Not more than one output should be shorted at a time.
Note 8:
I
CC
is measured with all outputs open, both RO inputs grounded following momentary connection to 4.5V, and all other inputs grounded.
Supply Voltage
Input Voltage
Operating Free Air Temperature Range
Storage Temperature Range
7V
5.5V
0
°
C to
+
70
°
C
65
°
C to
+
150
°
C
Symbol
V
CC
V
IH
V
IL
I
OH
I
OL
f
CLK
Parameter
Min
4.75
2
Nom
5
Max
5.25
Units
V
V
V
mA
mA
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Clock Frequency
(Note 4)
Pulse Width
(Note 4)
0.8
0.8
16
32
16
A
B
A
B
Reset
0
0
MHz
t
W
15
30
15
25
0
ns
t
REL
T
A
Reset Release Time (Note 4)
Free Air Operating Temperature
ns
°
C
70
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 5)
V
I
V
OH
Input Clamp Voltage
HIGH Level
V
CC
=
Min, I
I
=
12 mA
V
CC
=
Min, I
OH
=
Max
V
IL
=
Max, V
IH
=
Min
V
CC
=
Min, I
OL
=
Max
V
IH
=
Min, V
IL
=
Max (Note 6)
1.5
V
2.4
3.4
V
Output Voltage
LOW Level
Output Voltage
Input Current @ Max Input Voltage V
CC
=
Max, V
I
=
5.5V
HIGH Level
Input Current
V
OL
0.2
0.4
V
I
I
I
IH
1
mA
V
CC
=
Max
V
I
=
2.7V
A
Reset
80
40
μ
A
B
A
Reset
120
3.2
1.6
4.8
57
42
I
IL
LOW Level
Input Current
V
CC
=
Max
V
I
=
0.4V
mA
B
I
OS
I
CC
Short Circuit Output Current
Supply Current
V
CC
=
Max (Note 7)
V
CC
=
Max (Note 8)
18
mA
mA
29
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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| DM7490AN/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Asynchronous Up Counter |
| DM7490AN/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Asynchronous Up Counter |
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