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5028C7 Datasheet(PDF) 9 Page - Nippon Precision Circuits Inc |
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5028C7 Datasheet(HTML) 9 Page - Nippon Precision Circuits Inc |
9 / 13 page WF5028 series SEIKO NPC CORPORATION —9 FUNCTIONAL DESCRIPTION Standby Function When INHN goes LOW, the Q output becomes high impedance. Power-saving Pull-up Resistor The INHN pin pull-up resistance RUP1 or RUP2 changes in response to the input level (HIGH or LOW). When INHN is tied LOW level, the pull-up resistance is large (RUP1), reducing the current consumed by the resis- tance. When INHN is left open circuit, the pull-up resistance is small (RUP2), which increases the input suscep- tibility to external noise. However, the pull-up resistance ties the INHN pin HIGH level to prevent external noise from unexpectedly stopping the output. Oscillation Detector Function The WF5028 series also feature an oscillation detector circuit. This circuit functions to disable the outputs until the oscillator circuit starts and oscillation becomes stable. This alleviates the danger of abnormal oscillator out- put at oscillator start-up when power is applied or when INHN is switched. INHN Q Oscillator HIGH (or open) Frequency output Normal operation LOW High impedance Stopped |
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