NC7ST08
AC Electrical Characteristics
Symbol
t
PLH
,
t
PHL
4.5
5.5
t
TLH
,
t
THL
C
IN
C
PD
Input Capacitance
Power Dissipation Capacitance
Output Transition Time
5.0
4.5
5.5
Open
5.0
6
Parameter
Propagation Delay
V
CC
(V)
5.0
Min
T
A
= +25°C
Typ
4
6
6
12
5
11
4
11
10
Max
12
17
16
27
14
26
10
25
21
10
31
26
20
31
18
30
ns
ns
pF
pF
(Note 3)
Figure 2
C
L
=
15 pF
C
L
=
50 pF
Figures
1, 3
ns
C
L
=
50 pF
T
A
=
40°C to
+85°C
Min
Max
Units
ns
Conditions
C
L
=
15 pF
Figures
1, 3
Fig. No.
Note 3:
C
PD
is defined as the value of the internal equivalent capacitance which is derived from dynamic operating current consumption (I
CCD
) at no output
loading and operating at 50% duty cycle. (See Figure 2.) C
PD
is related to I
CCD
dynamic operating current by the expression:
I
CCD
=
(C
PD
)(V
CC
)(f
IN
)
+
(I
CC
static).
AC Loading and Waveforms
C
L
includes load and stray capacitance
Input PRR
=
1.0 MHz; t
w
=
500 ns
FIGURE 1. AC Test Circuit
FIGURE 3. AC Waveforms
Input
=
AC Waveform; PRR
=
variable; Duty Cycle
=
50%
FIGURE 2. I
CCD
Test Circuit
3
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