
TC74VHC161,163F/FN/FT/FK
2007-10-01
8
AC Characteristics
(input: t
r
= t
f
= 3 ns)
Test Condition
Ta = 25°C
Ta =
40 to 85°C
Characteristics
Symbol
V
CC
(V)
C
L
(pF)
Min
Typ.
Max
Min
Max
Unit
15
―
8.3
12.8
1.0
15.0
3.3 ± 0.3
50
―
10.8
16.3
1.0
18.5
15
―
4.9
8.1
1.0
9.5
Propagation delay
time
(CK-Q)
t
pLH
t
pHL
Figure 1,
Figure 2
5.0 ± 0.5
50
―
6.4
10.1
1.0
11.5
ns
15
―
8.7
13.6
1.0
16.0
3.3 ± 0.3
50
―
11.2
17.1
1.0
19.5
15
―
4.9
8.1
1.0
9.5
Propagation delay
time
(CK-CARRY,
count-mode)
t
pLH
t
pHL
Figure 1
5.0 ± 0.5
50
―
6.4
10.1
1.0
11.5
ns
15
―
11.0
17.2
1.0
20.0
3.3 ± 0.3
50
―
13.5
20.7
1.0
23.5
15
―
6.2
10.3
1.0
12.0
Propagation delay
time
(CK-CARRY,
preset-mode)
t
pLH
t
pHL
Figure 2
5.0 ± 0.5
50
―
7.7
12.3
1.0
14.0
ns
15
―
7.5
12.3
1.0
14.5
3.3 ± 0.3
50
―
10.5
15.8
1.0
18.0
15
―
4.9
8.1
1.0
9.5
Propagation delay
time
(ENT-CARRY)
t
pLH
t
pHL
Figure 6
5.0 ± 0.5
50
―
6.4
10.1
1.0
11.5
ns
15
―
8.9
13.6
1.0
16.0
3.3 ± 0.3
50
―
11.2
17.1
1.0
19.5
15
―
5.5
9.0
1.0
10.5
Propagation delay
time
(
CLR
-Q)
(Note 2)
t
pHL
Figure 4
5.0 ± 0.5
50
―
7.0
11.0
1.0
12.5
ns
15
―
8.4
13.2
1.0
15.5
3.3 ± 0.3
50
―
10.9
16.7
1.0
19.0
15
―
5.0
8.6
1.0
10.0
Propagation delay
time
(
CLR
-CARRY)
(Note 2)
t
pHL
Figure 4
5.0 ± 0.5
50
―
6.5
10.6
1.0
12.0
ns
15
80
130
―
70
―
3.3 ± 0.3
50
55
85
―
50
―
15
135
185
―
115
―
Maximum clock
frequency
f
max
―
5.0 ± 0.5
50
95
125
―
85
―
MHz
Input capacitance
C
IN
―
―
4
10
―
10
pF
Power dissipation
capacitance
C
PD
(Note 1)
―
23
―
―
―
pF
Note 1: C
PD
is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load.
Average operating current can be obtained by the equation:
I
CC (opr)
= C
PD
V
CC
f
IN
+
I
CC
When the outputs drive a capacitive load, total current consumption is the sum of C
PD
, and
Δ
I
CC
which is
obtained from the following formula:
+
+
+
+
16
C
16
C
8
C
4
C
2
C
V
f
=
Δ
I
CO
QD
QC
QB
QA
CC
CK
CC
C
QA
to C
QD
and C
CO
are the capacitances at QA to QD and CARRY OUT, respectively.
f
CK
is the input frequency of the CK.
Note 2: For TC74VHC161 only