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參數(shù)資料
| 型號： | HD74HC648 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Octal Bus Transceivers/Registers with Multiplexed 3-state outputs |
| 中文描述： | 八路總線收發(fā)器/ 3的復(fù)用寄存器態(tài)輸出 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 61K |
| 代理商： | HD74HC648 |
HD74HC646/HD74HC648
7
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
ns
Clock AB to B or
frequency
4.5
—
—
27
—
21
Clock BA to A
6.0
—
—
32
—
25
Propagation delay t
PLH
time
2.0
—
—
170 —
215
ns
A or B input to B or A output
t
PHL
4.5
—
14
34
—
43
(HD74HC646 only)
6.0
—
—
29
—
37
t
PLH
t
PHL
2.0
—
—
150 —
190
ns
A or B input to B or A output
4.5
—
14
30
—
38
(HD74HC648 only)
6.0
—
—
26
—
33
t
PLH
t
PHL
2.0
—
—
220 —
275
ns
Clock BA or Clock AB input to
4.5
—
18
44
—
55
A or B output
6.0
—
—
37
—
47
t
PLH
t
PHL
2.0
—
—
170 —
215
ns
Select BA or Select AB input to
4.5
—
15
34
—
43
A or B output, with A or B high
6.0
—
—
29
—
37
t
PLH
t
PHL
2.0
—
—
170 —
215
ns
Select BA or Select AB input to
4.5
—
16
34
—
43
A or B output, with A or B low
6.0
—
—
29
—
37
Output enable
t
ZH
t
ZL
2.0
—
—
150 —
190
ns
Control
G
input or Direction to
time
4.5
—
17
30
—
38
A or B output
6.0
—
—
26
—
33
Output disable
t
LZ
t
HZ
2.0
—
—
150 —
190
ns
Control
G
input to A or B
time
4.5
—
20
30
—
38
output
6.0
—
—
26
—
33
Setup time
t
su
2.0
100 —
—
125
—
ns
4.5
20
3
—
25
—
6.0
17
—
—
21
—
Hold time
t
h
2.0
5
—
—
5
—
ns
4.5
5
0
—
5
—
6.0
5
—
—
5
—
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