WF5028 series
AC Characteristics
V
= 0.8 to 2.0V, V = 0V, Ta = −40 to +85°C unless otherwise noted.
SS
DD
Rating
typ
1.ꢀ
1.7
1.ꢀ
1.7
50
Parameter
Symbol
Condition
Unit
min
–
max
ꢀ.0
4.0
ꢀ.0
4.0
55
t
V
V
V
V
= 1.1 to 2.0V
= 0.8 to 1.1V
= 1.1 to 2.0V
= 0.8 to 1.1V
ns
ns
ns
ns
%
r1
DD
DD
DD
DD
Measurement cct 1, C = 15pF,
L
Output rise time
Output fall time
0.2V to 0.8V
DD
DD
t
–
r2
t
–
f1
Measurement cct 1, C = 15pF,
L
0.8V to 0.2V
DD
DD
t
–
f2
Output duty cycle
Duty
Measurement cct 1, Ta = 25°C, C = 15pF
45
–
L
Output disable delay time
t
Measurement cct 2, Ta = 25°C, C ≤ 15pF
–
50
µs
OD
L
Timing chart
Q
0.8VDD
0.8VDD
DUTY measurement
voltage (0.5VDD)
TW
0.2VDD
0.2VDD
T
DUTY= TW/ T 100 (%)
tr
tf
Figure 1. Output switching waveform
VIH
INHN
VIL
tOD
tSTR
0.1V
Q
Normal
operation
Output
stopped
Normal
operation
Hi-Z*
When INHN goes HIGH to LOW, the Q output goes HIGH once and then becomes high impedance.
When INHN goes LOW to HIGH, the Q output goes from high impedance to normal output operation when the oscillation starts (oscillation is detected).
*) The high-impedance interval in the figure is shown as a LOW level due to the 1kΩ pull-down resistor connected to the Q pin (see "Measurement circuit
2" in the "Measurement Circuits" section).
Figure 2. Output disable and oscillation start timing chart
SEIKO NPC CORPORATION —8
NPC [ NIPPON PRECISION CIRCUITS INC ]
