The RE46C122 is low power CMOS ionization type smoke detector IC. With few external components this circuit will provide all the required features for an ionization type smoke detector. An internal oscillator strobes power to the smoke detection circuitry for 10.5mS every 1.66 seconds to keep standby current to a minimum. A check for a low battery condition is performed every 40 seconds when in standby. The temporal horn pattern supports the NFPA 72 emergency evacuation signal. An interconnect pin allows multiple detectors to be connected such that when one units alarms all units will sound. An internal 10 minute timer allows for a separate button to be used for reduced sensitivity mode. Although this device was designed for smoke detection utilizing an ionization chamber it could be used in a variety of security applications. The RE46C122 was designed for use in smoke detectors that comply with Und

   >1500V ESD Protection (HBM) on all Pins

   Guard Outputs for Ion Detector Input

   +/-0.75pA Detect Input Current

   Internal Reverse Battery Protection

   Low Quiescent Current Consumption (

   Available in 16L PDIP or 16L N SOIC

   Internal Low Battery Detection

   Power Up Low Battery Test

   Interconnect up to 40 Detectors

   10 Minute Timer for Sensitivity Control

   Compatible with Allegro A5367

   Available in Standard Packaging or RoHS Compliant Pb Free Packaging.