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參數(shù)資料
| 型號： | CD74AC191M |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | Presettable Synchronous 4-Bit Binary Up/Down Counter |
| 中文描述： | 可預置同步4位二進制加/減計數(shù)器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 51K |
| 代理商： | CD74AC191M |
6
Set-Up Time, CE to CP
t
SU
5
9.2
-
10.5
-
ns
Set-Up Time, U/D to CP
t
SU
5
10.5
-
12
-
ns
Hold Time, Pn to PL
t
H
5
2
-
2
-
ns
Hold Time, CE to CP
t
H
5
0
-
0
-
ns
Hold Time, U/D to CP
t
H
5
0
-
0
-
ns
NOTES:
8. 3.3V Min is at 3V.
9. 5V Min is at 4.5V.
10. Applies to non-cascaded operation only. With cascaded counters clock-to-terminal count propagation delays, count enable (CE)-to-clock
set-up times, and count enable (CE)-to-clock hold times determine max clock frequency. For example, with these AC devices at 85
o
C
and V
CC
= 5V:.
f
MAX
Switching Specifications
Input t
r
, t
f
= 3ns, C
L
= 50pF (Worst Case)
PARAMETER
SYMBOL
V
CC
(V)
-40
o
C TO 85
o
C
-55
o
C TO 125
o
C
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
AC TYPES
Propagation Delay
PL to Qn
t
PLH
, t
PHL
1.5
-
-
171
-
-
188
ns
3.3
(Note 12)
5.4
-
19.1
5.3
-
21
ns
5
(Note 13)
3.9
-
13.6
3.8
-
15
ns
Propagation Delay
Pn to Qn
t
PLH
, t
PHL
1.5
-
-
173
-
-
190
ns
3.3
5.4
-
19.4
5.3
-
21.3
ns
5
3.9
-
13.8
3.8
-
15.2
ns
Propagation Delay
CP to Qn
t
PLH
, t
PHL
1.5
-
-
182
-
-
200
ns
3.3
5.8
-
20.4
5.6
-
22.4
ns
5
4.1
-
14.5
4
-
16
ns
Propagation Delay
CP to RC
t
PLH
, t
PHL
1.5
-
-
136
-
-
150
ns
3.3
4.3
-
15.3
4.2
-
16.8
ns
5
3.1
-
11
3
-
12
ns
Propagation Delay
CP to TC
t
PLH
, t
PHL
1.5
-
-
227
-
-
250
ns
3.3
7.2
-
25.5
7
-
28
ns
5
5.2
-
18.2
5
-
20
ns
Propagation Delay
U/D to RC
t
PLH
, t
PHL
1.5
-
-
246
-
-
271
ns
3.3
7.8
-
27.6
7.6
-
30.4
ns
5
5.6
-
19.7
5.4
-
21.7
ns
Propagation Delay
U/D to TC
t
PLH
, t
PHL
1.5
-
-
160
-
-
176
ns
3.3
5.1
-
17.9
4.9
-
19.7
ns
5
3.6
-
12.8
3.5
-
14.1
ns
Prerequisite For Switching Function
(Continued)
PARAMETER
SYMBOL
V
CC
(V)
-40
o
C TO 85
o
C
-55
o
C TO 125
o
C
UNITS
MIN
MAX
MIN
MAX
CP
(
)
-------------------------------------------------------------------------------------------------------------------------------------------------------
0
+
------------+
36MHz
≈
=
=
CD74AC191, CD74ACT191
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