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參數(shù)資料
| 型號(hào)： | HD74HC390 |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | 通用總線功能 |
| 英文描述： | Dual Decade Counters |
| 中文描述： | 雙十年計(jì)數(shù)器 |
| 文件頁(yè)數(shù)： | 5/9頁(yè) |
| 文件大?。?/td> | 51K |
| 代理商： | HD74HC390 |
HD74HC390
5
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
Maximum clock
f
max
—
—
5
—
4
MHz
frequency
4.5
—
—
27
—
21
6.0
—
—
32
—
25
Propagation delay t
PLH
time
2.0
—
—
120 —
150
ns
Clock A to Q
A
t
PHL
4.5
—
11
24
—
30
6.0
—
—
20
—
26
t
PLH
t
PHL
2.0
—
—
290 —
365
ns
Clock A to Q
C
(Q
A
connected to Clock B)
4.5
—
32
58
—
73
6.0
—
—
49
—
62
t
PLH
t
PHL
2.0
—
—
130 —
165
ns
Clock B to Q
B
4.5
—
16
26
—
33
6.0
—
—
22
—
28
t
PLH
t
PHL
2.0
—
—
185 —
230
ns
Clock B to Q
C
4.5
—
20
37
—
46
6.0
—
—
31
—
39
t
PLH
t
PHL
2.0
—
—
130 —
165
ns
Clock B to Q
D
4.5
—
15
26
—
33
6.0
—
—
22
—
28
t
PHL
2.0
—
—
165 —
205
ns
Clear to Q
A
, Q
B
, Q
C
, Q
D
4.5
—
14
33
—
41
6.0
—
—
28
—
35
Pulse width
t
w
2.0
80
—
—
100
—
ns
4.5
16
8
—
20
—
6.0
14
—
—
17
—
Removal time
t
h
2.0
25
—
—
31
—
ns
4.5
5
1
—
6
—
6.0
4
—
—
5
—
Output rise/fall
t
TLH
t
THL
2.0
—
—
75
—
95
ns
time
4.5
—
5
15
—
19
6.0
—
—
13
—
16
Input capacitance
Cin
—
—
5
10
—
10
pF
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