MC14468

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Freescale Semiconductor, Inc. Order this document by MC14468/D MC14468 Low–Power CMOS Ionization Smoke Detector IC with Interconnect The MC14468, when used with an ionization chamber and a small number of external components, will detect smoke. When smoke is sensed, an alarm is sounded via an external piezoelectric transducer and internal drivers. This circuit is designed to operate in smoke detector systems that comply with UL217 and UL268 specifications. Ionization Type with On–Chip FET Input Comparator 16 1 P SUFFIX PLASTIC DIP CASE 648–08 Freescale Semiconductor, Inc... Piezoelectric Horn Driver Guard Outputs on Both Sides of Detect Input Input–Production Diodes on the Detect Input Low–Battery Trip Point, Internally Set, can be Altered Via External Resistor Detect Threshold, Internally Set, can be Altered Via External Resistor Pulse Testing for Low Battery Uses LED for Battery Loading Comparator Output for Detect Internal Reverse Battery Protection Strobe Output for External Trim Resistors I/O Pin Allows Up to 40 Units to be Connected for Common Signaling Power–On Reset Prevents False Alarms on Battery Change ORDERING INFORMATION MC14468P PLASTIC DIP PIN ASSIGNMENT (16 PIN DIP) Detect Comp. Out I/O Low V Set Strobe Out LED VDD Timing Resistor Feedback 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 Guard Hi–Z Detect Input Guard Lo–Z Sensitivity Set Osc Capacitor Silver Brass VSS MAXIMUM RATINGS* (Voltages...