The RE46C127 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. A 2/3 duty cycle continuous horn pattern is used for the alarm condition. An interconnect pin allows multiple detectors to be connected such that when one units alarms all units will sound. An internal 8 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 RE46C127 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 Continuous Tone
Low Battery Detect True
Reverse Battery Protection True
Alarm Interconnect True
Sensitivty Timer True
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
Low Quiescent Current Consumption (<6.5uA)
Available in 16L PDIP or 16L N SOIC
ESD Protection on all Pins
Internal Low Battery Detection
Interconnect up to 40 Detectors
8 Minute Timer for Sensitivity Control
Compatible with Allegro A5348
Available in Standard Packaging or RoHS Compliant Pb Free Packaging.
