參數(shù)資料
型號(hào): HD74HC191
廠商: Hitachi,Ltd.
元件分類: 通用總線功能
英文描述: Synchronous Up/Down Decade,4-bit Binary Counter(Single Clock Line)
中文描述: 同步向上/向下十年,4 -位二進(jìn)制計(jì)數(shù)器(單時(shí)鐘線)
文件頁數(shù): 8/13頁
文件大?。?/td> 75K
代理商: HD74HC191
HD74HC190/HD74HC191
8
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
25
20
6.0
29
24
Propagation delay t
PLH
time
2.0
265 —
335
ns
Load to Q
t
PHL
4.5
21
53
66
6.0
45
56
2.0
230 —
290
Data to Q
4.5
18
46
58
6.0
39
49
2.0
120 —
150
Clock to RC
4.5
14
24
30
6.0
20
26
2.0
190 —
240
Clock to Q
4.5
22
38
48
6.0
32
41
2.0
250 —
315
Clock to max/min
4.5
26
50
63
6.0
43
54
2.0
230 —
290
Down/up to RC
4.5
20
46
58
6.0
39
49
2.0
130 —
165
G to RC
4.5
14
26
33
6.0
22
28
2.0
190 —
240
Down/up to max/min
4.5
17
38
48
6.0
32
41
Pulse width
t
w
2.0
80
100
ns
4.5
16
8
20
6.0
14
17
Hold time
t
h
2.0
0
0
ns
4.5
0
–6
0
6.0
0
0
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