Datasheet Microchip RE46C120

R&E International
A Subsidiary of Microchip Technology Inc. RE46C120
CMOS Ionization Smoke Detector ASIC
Product Specification General Description Features The RE46C120 is a low power CMOS ionization type
smoke detector IC. With a 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 TONE input allows for selection of a
temporal pattern or a 2/3 duty cycle continuous tone.
The temporal horn pattern supports the NFPA 72
emergency evacuation signal. Guard Outputs for Ion Detector Input
+/-0.75pA Detect Input Current
Internal Reverse Battery Protection
Internal Low Battery Detection
Pin Selectable Horn Pattern
Low Quiescent Current Consumption (<6.5uA)
16L PDIP
ESD Protection on all Pins
Compatible with MC145017, MC14467
UL Recognized per File S24036 …