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參數(shù)資料
| 型號(hào)： | HD74HC490 |
| 廠(chǎng)商： | Hitachi,Ltd. |
| 元件分類(lèi)： | 通用總線(xiàn)功能 |
| 英文描述： | Dual 4-bit Decade Counters |
| 中文描述： | 雙4位十年計(jì)數(shù)器 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 44K |
| 代理商： | HD74HC490 |
HD74HC490
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
—
—
4
—
3
MHz
frequency
4.5
—
—
20
—
16
6.0
—
—
24
—
19
Propagation delay t
PLH
time
2.0
—
—
120 —
150
ns
Clock to Q
A
t
PHL
4.5
—
13
24
—
30
6.0
—
—
20
—
26
t
PLH
t
PHL
2.0
—
—
205 —
255
ns
Clock to Q
B
Q
C
4.5
—
21
41
—
51
6.0
—
—
35
—
43
t
PLH
t
PHL
2.0
—
—
280 —
350
ns
Clock to Q
C
4.5
—
23
56
—
70
6.0
—
—
48
—
60
t
PHL
2.0
—
—
205 —
255
ns
Clear to any output
4.5
—
18
41
—
51
6.0
—
—
35
—
43
t
PLH
2.0
—
—
205 —
255
ns
Set-to-9 to Q
A
, Q
D
4.5
—
13
41
—
51
6.0
—
—
35
—
43
t
PHL
2.0
—
—
190 —
240
ns
Set-to-9 to Q
B
, Q
C
4.5
—
17
38
—
48
6.0
—
—
32
—
41
Pulse width
t
w
2.0
80
—
—
100
—
ns
4.5
16
6
—
20
—
6.0
14
—
—
17
—
Setup time
t
su
2.0
100 —
—
125
—
ns
4.5
20
1
—
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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