參數(shù)資料
型號: HC49
廠商: Electronic Theatre Controls, Inc.
英文描述: ECM Standard Crystal
中文描述: 流腦標準水晶
文件頁數(shù): 4/8頁
文件大?。?/td> 44K
代理商: HC49
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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