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General Description

The RE46C141 is low power CMOS photoelectric type smoke detector IC. With minimal external components this circuit will provide all the required features for a photoelectric type smoke detector.

The design incorporates a gain selectable photo amplifier for use with an infrared emitter/detector pair. An internal oscillator strobes power to the smoke detection circuitry for 100us every 8.1 seconds to keep standby current to a minimum. If smoke is sensed the detection rate is increased to verify an alarm condition. A high gain mode is available for push button chamber testing.

A check for a low battery condition and chamber integrity is performed every 32 seconds when in standby. The temporal horn pattern supports the NFPA 72 emergency evacuation signal.

Features

? Internal Power On Reset

? Low Quiescent Current Consumption

? Available in 16L PDIP or 16L N SOIC

? ESD Protection on all Pins

? Interconnect up to 40 Detectors

? Temporal Horn Pattern

? Low Battery and Chamber Test

? Compatible with Motorola MC145012

? Available in Standard Packaging or RoHS Compliant Pb Free Packaging.