CF5035 series
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 stops.
INHN
HIGH (or open)
LOW
Q
f
O
output frequency
High impedance
Oscillator
Normal operation
Stopped
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 Detector Function
The devices also feature an oscillation detector circuit. This circuit functions to disable the outputs until the
oscillator circuit starts. This prevents abnormal oscillator output at oscillator start-up when power is applied or
when INHN is switched.
SEIKO NPC CORPORATION —6
NPC [ NIPPON PRECISION CIRCUITS INC ]
