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The MC14467-1, when used with an ionization chamber and a small number

of external components, will detect smoke. When smoke is sensed, an alarm is

sounded via an external piezoelectric transducer and internal drivers. This circuit

is designed to operate in smoke detector systems that comply with UL217 and

UL268 specifications.

Features

? Ionization Type with On-Chip FET Input Comparator

? Piezoelectric Horn Driver

? Guard Outputs on Both Sides of Detect Input

? Input-Production Diodes on the Detect Input

? Low-Battery Trip Point, Internally Set, can be Altered Via External Resistor

? Detect Threshold, Internally Set, can be Altered Via External Resistor

? Pulse Testing for Low Battery Uses LED for Battery Loading

? Comparator Outputs for Detect and Low Battery

? Internal Reverse Battery Protection