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參數(shù)資料
| 型號： | HD74HC108 |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | 通用總線功能 |
| 英文描述： | Synchronous 4-Bit Up/Down Binary Counter 16-CDIP -55 to 125 |
| 中文描述： | 雙JK觸發(fā)器（帶預(yù)置，共同明確和共同的時鐘） |
| 文件頁數(shù)： | 4/9頁 |
| 文件大?。?/td> | 55K |
| 代理商： | HD74HC108 |
HD74HC108
4
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
—
—
6
—
5
MHz
frequency
4.5
—
—
30
—
24
6.0
—
—
35
—
28
Propagation delay t
PLH
time
2.0
—
—
150 —
190
ns
Clock to Q or
Q
t
PHL
4.5
—
20
30
—
38
6.0
—
—
26
—
33
2.0
—
—
140 —
175
ns
Clear to Q or
Q
4.5
—
18
28
—
35
6.0
—
—
24
—
30
2.0
—
—
140 —
175
ns
Preset to Q or
Q
4.5
—
16
28
—
35
6.0
—
—
24
—
30
Pulse width
t
w
2.0
80
—
—
100
—
ns
4.5
16
7
—
20
—
6.0
14
—
—
17
—
Setup time
t
su
2.0
100 —
—
125
—
ns
4.5
20
2
—
25
—
6.0
17
—
—
21
—
Hold time
t
h
2.0
5
—
—
5
—
ns
4.5
5
–1
—
5
—
6.0
5
—
—
5
—
Removal time
t
rem
2.0
100 —
—
125
—
ns
4.5
20
–2
—
25
—
6.0
17
—
—
21
—
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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