Low-Power CMOS Ionization Smoke Detector with Interconnect and Timer

The MC14568, 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 UL

Phase Comparator and Programmable Counters

The MC14568B consists of a phase comparator, a divide–by–4, 16, 64 or 100 counter and a programmable divide–by–N 4–bit binary counter (all positive–edge triggered) constructed with MOS P–channelandN–channel enhancement mode devices (complementary MOS) in a monolithic structure. TheMC14568B has bee