The RE46C190 is not recommended for new designs. 
Please use the RE46C191 for all new designs.

The RE46C190 is a low voltage, low current programmable photoelectric smoke detector IC. This circuit will provide all the required features for a photoelectric smoke detector with minimal external components. Programmable setup, calibration and feature selection are the key to reduced component count and reduced manufacturing costs. The boost regulator insures proper operation of the infrared diode and the piezo horn under low battery conditions. The RE46C190 was designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268.

For product comparison, please consider: RE46C191

• Two AA battery Operation
• Low Quiescent Current Consumption
• Internal IRED driver with Programmable IRED Current
• Programmable Photo Amplifier
• Programmable Smoke Sensitivity Levels
• 9 Minute Timer for Reduced Sensitivity Operation
• Chamber Test with Programmable Sensitivity Level
• Internal Low Battery Test with Programmable Threshold
• Interconnect up to 40 Detectors
• Local Alarm Memory
• Temporal or Continuous Horn Pattern
• All internal Oscillator
• Internal Power On Reset
• Available 16L N SOIC