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MC74HC161A_13 Datasheet, PDF (6/15 Pages) ON Semiconductor – Presettable Counters
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MC74HC161A, MC74HC163A
TIMING REQUIREMENTS (CL = 50 pF, Input tr = tf = 6.0 ns)
Symbol
tsu
Parameter
Minimum Setup Time,
Preset Data Inputs to Clock
tsu
Minimum Setup Time,
Load to Clock
tsu
Minimum Setup Time,
Reset to Clock (HC163A Only)
tsu
Minimum Setup Time,
Enable T or Enable P to Clock
th
Minimum Hold Time,
Clock to Load or Preset Data Inputs
th
Minimum Hold Time,
Clock to Reset (HC163A Only)
th
Minimum Hold Time,
Clock to Enable T or Enable P
trec
Minimum Recovery Time,
Reset Inactive to Clock (HC161A Only)
trec
Minimum Recovery Time,
Load Inactive to Clock
tw
Minimum Pulse Width,
Clock
tw
Minimum Pulse Width,
Reset (HC161A Only)
tr, tf Maximum Input Rise and Fall Times
Guaranteed Limit
VCC
Figure V – 55 to 25_C v 85_C v 125_C Unit
8
2.0
40
3.0
20
4.5
15
6.0
12
60
80
ns
30
40
20
30
18
20
8
2.0
60
3.0
25
4.5
15
6.0
12
75
90
ns
30
40
20
30
18
20
7
2.0
60
3.0
25
4.5
20
6.0
17
75
90
ns
30
40
25
35
23
25
9
2.0
80
3.0
35
4.5
20
6.0
17
95
110
ns
40
50
25
35
23
25
8
2.0
3
3.0
3
4.5
3
6.0
3
3
3
ns
3
3
3
3
3
3
7
2.0
3
3.0
3
4.5
3
6.0
3
3
3
ns
3
3
3
3
3
3
9
2.0
3
3.0
3
4.5
3
6.0
3
3
3
ns
3
3
3
3
3
3
5
2.0
80
3.0
35
4.5
15
6.0
12
95
110
ns
40
50
20
26
17
23
8
2.0
80
3.0
35
4.5
15
6.0
12
95
110
ns
40
50
20
26
17
23
4
2.0
60
3.0
25
4.5
12
6.0
10
75
90
ns
30
40
15
18
13
15
5
2.0
60
3.0
25
4.5
12
6.0
10
75
90
ns
30
40
15
18
13
15
2.0
1000
3.0
800
4.5
500
6.0
400
1000
1000
ns
800
800
500
500
400
400
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