CF5074A
SWITCHING CHARACTERISTICS
V
DD
= 2.25 to 3.6V, V
C
= 0.5V
DD
, V
SS
= 0V, Ta = –40 to +85
°
C unless otherwise noted.
Rating
Parameter
Symbol
Conditions
Min
Output rise time
Output fall time
t
r1
t
f1
Measurement circuit 2, load circuit 1,
0.2V
DD
→
0.8V
DD
, Ta = 25
°
C, C
L
= 15pF
Measurement circuit 2, load circuit 1,
0.8V
DD
→
0.2V
DD
, Ta = 25
°
C, C
L
= 15pF
Measurement circuit 2,
load circuit 1, Ta = 25
°
C,
C
L
= 15pF
V
DD
= 2.5V
V
DD
= 3.3V
–
–
40
45
–
–
Typ
2.5
2.5
50
50
–
–
Max
4
4
60
55
100
100
ns
ns
%
%
ns
ns
Unit
Output duty cycle
Output disable delay time
Output enable delay time
Duty
t
PLZ
t
PZL
Measurement circuit 5, load circuit 1,
Ta = 25
°
C, C
L
≤
15pF
FUNCTIONAL DESCRIPTION
Standby Function
When INHN goes LOW, the device is in standby mode. The Q output becomes high impedance and the oscilla-
tor circuit continues running.
INHN
HIGH (or open)
LOW
Q
f
O
High impedance
Oscillator
Operating
Operating
Power-saving Pull-up Resistor
The INHN pin pull-up resistance changes in response to the input level (HIGH or LOW). When INHN is tied
LOW, the pull-up resistance becomes large, reducing the current consumed by the resistance. When INHN is
left open, the pull-up resistance becomes small, such that even if the input is affected by external noise the out-
puts are stable due to INHN being tied HIGH by the pull-up resistor.
Oscillation Start-up Detector Function
The devices also feature an oscillation start-up detector circuit. This circuit functions to disable the outputs
until the oscillation starts. This prevents unstable oscillator output at oscillator start-up when power is applied.
SEIKO NPC CORPORATION —5
NPC [ NIPPON PRECISION CIRCUITS INC ]
