RE46C121 DataSheet

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  CMOS Ionization Smoke Detector ASIC with Interconnect


The RE46C121 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 unit alarms all units will sound. Although this device was designed for smoke detection utilizing an ionization chamber it can be used in a variety of security applications. The RE46C121 was designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268.

Parameter Name  Value
Type  Ionization
Horn Driver Alarm Pattern  NFPA Temporal
Low Battery Detect  True
Reverse Battery Protection  True
Alarm Interconnect  True
Sensitivty Timer  False
Powerup Low Battery  False
Operating Temperature Range (C)  -10C to 60C

     Features
Guard Outputs for Ion Detector Input
+/-0.75pA Detect Input Current  
Internal Reverse Battery Protection
Internal Low Battery Detection
Low Quiescent Current Consumption (<6.5uA)
Available in 16L PDIP or 16L N SOIC
ESD Protection on all Pins
Interconnect up to 40 Detectors
Compatible with MC145018
Available in Standard Packaging or RoHS Complaint Pb Free Packaging



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