general desc-ription the m75018 is a low-current cmos circuit providing all of the required features for an ionization-type smoke detector. a networking capability allows as many as 40 units to be interconnected so that if any unit senses smoke, all units will sound an alarm. in addition, special features are incorporated to facilitate alignment and test of the finished smoke detector. this device is designed to comply with underwriters laboratories specification ul217. the internal oscillator and timing circuitry keeps standby power to a minimum by powering down the device for 1.67 seconds and sensing smoke for only 10ms.every 24 on/off cycles, a check is made for low battery condition. by substituting other types of sensors, or a switch for the ionization detector, this very-low power device can be used in numerous other battery-operated safety/security applications.