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參數(shù)資料
| 型號(hào)： | HD74HC670 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-by-4 Register File (with 3-state outputs) |
| 中文描述： | 4 × 4寄存器文件（具有三態(tài)輸出） |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 56K |
| 代理商： | HD74HC670 |
HD74HC670
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
Propagation delay t
PLH
time
—
—
160 —
200
ns
Read select to Q
t
PHL
4.5
—
21
32
—
40
6.0
—
—
27
—
34
t
PLH
t
PHL
2.0
—
—
200 —
250
ns
Write enable to Q
4.5
—
24
40
—
50
6.0
—
—
34
—
43
t
PLH
t
PHL
2.0
—
—
150 —
190
ns
Data to Q
4.5
—
18
30
—
38
6.0
—
—
26
—
33
Output enable
t
ZH
t
ZL
2.0
—
—
150 —
190
ns
time
4.5
—
18
30
—
38
6.0
—
—
26
—
33
Output disable
t
HZ
t
LZ
2.0
—
—
150 —
190
ns
time
4.5
—
17
30
—
38
6.0
—
—
26
—
33
Pulse width
t
w
2.0
80
—
—
100
—
ns
4.5
16
—
—
20
—
6.0
14
—
—
17
—
Setup time
t
su
2.0
60
—
—
75
—
ns
Data to Write enable
4.5
12
4
—
15
—
6.0
10
—
—
13
—
t
su
2.0
60
—
—
75
—
ns
Write select to Write enable
4.5
12
—
—
15
—
6.0
10
—
—
13
—
Hold time
t
h
2.0
50
—
—
63
—
ns
Write enable to Data
4.5
10
6
—
13
—
6.0
9
—
—
11
—
2.0
50
—
—
63
—
ns
Write enable to Write select
4.5
10
—
—
13
—
6.0
9
—
—
11
—
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