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參數(shù)資料
| 型號： | 74F525QCX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Programmable Counter |
| 中文描述： | F/FAST SERIES, ASYN POSITIVE EDGE TRIGGERED DOWN DIVIDE BY N COUNTER, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 184K |
| 代理商： | 74F525QCX |
AC Electrical Characteristics
74F
74F
T
A
e a
25
§
C
V
CC
e a
5.0V
C
L
e
50 pF
T
A
, V
CC
e
Com
C
L
e
50 pF
Symbol
Parameter
Units
Min
Typ
Max
Min
Max
f
max
Maximum Clock Frequency
50
60
40
MHz
t
PLH
t
PHL
Propagation Delay
CP to Q
9.0
8.0
16.0
12.0
20.5
15.5
8.0
7.0
22.5
17.5
ns
t
PLH
t
PHL
Propagation Delay
CP to Q/2
9.0
10.0
15.5
15.5
20.0
20.0
8.0
9.0
22.0
22.0
ns
t
PLH
t
PHL
Propagation Delay
XTR to Q
8.5
6.0
12.0
10.5
15.5
13.5
7.5
5.0
17.5
15.0
ns
t
PLH
t
PHL
Propagation Delay
MR to Q
11.5
9.0
16.5
12.5
21.0
16.0
10.5
8.0
23.0
18.0
ns
t
PLH
t
PHL
Propagation Delay
MRto Q/2
8.0
7.0
14.0
10.5
17.5
13.5
7.0
6.0
19.5
15.0
ns
t
PLH
t
PHL
Propagation Delay
M
n
to Q
10.0
10.5
15.0
17.0
19.0
21.5
9.0
9.5
21.0
23.5
ns
AC Operating Requirements
74F
74F
Symbol
Parameter
T
A
e a
25
§
C
V
CC
e a
5.0V
T
A
, V
CC
e
Com
Units
Min
Max
Min
Max
t
s
(H)
t
s
(L)
Setup Time, HIGH or LOW
D
n
to WE
2.0
4.0
2.5
4.5
ns
t
h
(H)
t
h
(L)
Hold Time, HIGH or LOW
D
n
to WE
0
0
ns
2.0
2.5
t
s
(H)
t
s
(L)
Setup Time, HIGH or LOW
D
n
to CP
9.0
10.5
10.0
12.0
ns
t
h
(H)
t
h
(L)
Hold Time, HIGH or LOW
D
n
to CP
0
0
0
0
ns
t
s
(H)
t
s
(L)
Setup Time, HIGH or LOW
XTR to CP
7.0
8.0
8.0
9.0
ns
t
h
(H)
Hold Time, HIGH or LOW
XTR to CP
0
0
ns
t
s
(H)
t
s
(L)
Setup Time, HIGH or LOW
Mode to CP
33.5
33.5
35.5
35.5
ns
t
w
(H)
XTR Pulse Width, HIGH
11.5
13.0
ns
t
w
(L)
MR Pulse Width, LOW
7.0
8.0
ns
t
w
(L)
WE Pulse Width, LOW
4.5
5.0
ns
t
w
(H)
t
w
(L)
CP Pulse Width
HIGH or LOW
3.5
9.5
4.0
10.5
ns
t
rec
Recovery Time
MR to CP
5.0
6.0
ns
t
rec
Recovery Time
Mode to CP
30.0
32.0
ns
7
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