Datasheet

www.fairchildsemi.com 4
NC7WZ38
AC Electrical Characteristics
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
Input = AC Waveform; t
r
= t
f
= 1.8 ns
PRR = 10 MHz; Duty Cycle = 50%
FIGURE 2. I
CCD
Test Circuit
FIGURE 3. AC Waveforms
Symbol Parameter
V
CC
T
A
= +25°CT
A
= −40°C to +85°C
Units Conditions
Figure
(V) Min Typ Max Min Max Number
t
PZL
Propagation Delay 1.8 ± 0.15 2.0 5.2 9.2 2.0 9.6
ns
C
L
= 50 pF
2.5 ± 0.2 1.5 3.5 5.7 1.5 6.1 RU = 500Ω
Figures
1, 3
3.3 ± 0.3 1.0 2.8 4.1 1.0 4.5 RD = 500Ω
5.0 ± 0.5 0.5 2.2 3.4 0.5 3.6 V
I
= 2 × V
CC
t
PLZ
Propagation Delay 1.8 ± 0.15 2.0 4.6 9.2 2.0 9.6
ns
C
L
= 50 pF
2.5 ± 0.2 1.5 3.2 5.7 1.5 6.1 RU = 500Ω
Figures
1, 3
3.3 ± 0.3 1.0 2.4 4.1 1.0 4.5 RD = 500Ω
5.0 ± 0.5 0.5 1.6 3.4 0.5 3.6 V
I
= 2 × V
CC
C
IN
Input Capacitance 0 2.5 pF
C
OUT
Output Capacitance 0 4.2 pF
C
PD
Power Dissipation 3.3 7
pF (Note 3) Figure 2
Capacitance 5.0 9