參數(shù)資料
型號(hào): HD74HC669
廠商: Hitachi,Ltd.
元件分類(lèi): 通用總線功能
英文描述: Synchronous UP/Down Decade,4-bit binary Counter
中文描述: 同步向上/向下十年,4 -位二進(jìn)制計(jì)數(shù)器
文件頁(yè)數(shù): 9/14頁(yè)
文件大小: 84K
代理商: HD74HC669
HD74HC668/HD74HC669
9
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
MHz
Frequency
4.5
27
21
6.0
32
25
Propagation delay t
PLH
time
2.0
200 —
250
ns
Clock to Ripple carry out
t
PHL
4.5
40
50
6.0
34
43
t
PLH
t
PHL
2.0
225 —
280
ns
Clock to Q
4.5
45
56
6.0
38
48
t
PLH
t
PHL
2.0
150 —
190
ns
Enable
T
to Ripple carry out
4.5
30
38
6.0
26
33
t
PLH
t
PHL
2.0
200 —
250
ns
U/
D
to Ripple carry out
4.5
40
50
6.0
34
43
Pulse width
t
w
2.0
80
100
ns
4.5
16
20
6.0
14
17
Setup time
t
su
2.0
100 —
125
ns
Data to Clock
4.5
20
25
6.0
17
21
t
su
2.0
150 —
190
ns
Enable
P
,
T
to Clock
4.5
30
38
6.0
26
33
t
su
2.0
150 —
190
ns
Loadk to Clock
4.5
30
38
6.0
26
33
t
su
2.0
150 —
190
ns
U/
D
to Clock
4.5
30
38
6.0
26
33
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