R&E International A Subsidiary of Microchip Technology Inc. RE46C144 CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode Product Specification Features General Description Internal Power On Reset The RE46C144 is low power CMOS photoelectric type Low Quiescent Current Consumption smoke detector IC. With minimal external components this circuit will provide all the required features for a Available in 16L PDIP, 16L N SOIC or 16L W SOIC photoelectric type smoke detector. ESD Protection on all Pins Interconnect up to 40 Detectors The design incorporates a gain selectable photo 10 Minute Timer for Sensitivity Control amplifier for use with an infrared emitter/detector pair. 75% Duty Cycle Horn Pattern An internal oscillator strobes power to the smoke Internal Low Battery and Chamber Test detection circuitry for 100us every 10 seconds to keep Compatible with Allegro A5358 standby current to a minimum. If smoke is sensed the UL Recognized per File S24036 detection rate is increased to verify an alarm condition. Available in Standard Packaging or RoHS A high gain mode is available for push button chamber Compliant Pb Free Packaging. testing. Pin Configuration A check for a low battery condition and chamber integrity is performed every 43 seconds when in standby. The alarm horn pattern utilizes a 75% duty TEST C1 1 16 cycle. C2 VSEN 2 15 An interconnect pin allows multiple detectors to be DETECT VSS 3 connected such that when one units alarms, all units 14 will sound. STROBE ROSC 4 13 An internal 10 minute timer can be used for a reduced COSC VDD 5 12 sensitivity mode. LED IRED 6 11 The RE46C144 is recognized by Underwriters IO FEED 7 10 Laboratories for use in smoke detectors that comply with specification UL217 and UL268. HORNB HORNS 8 9 ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL VALUE UNITS Supply Voltage V 15 V DD Input Voltage Range Except FEED, IO V -.3 to V+.3 V in dd FEED Input Voltage Range V -10 to +22 V infd IO Input Voltage Range V -.3 to 17 V io1 Input Current except FEED I 10 mA in Operating Temperature T -25 to 75 C A Storage Temperature T -55 to 125 C STG Maximum Junction Temperature T 150 C J Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and operation at these conditions for extended periods may affect device reliability. This product utilizes CMOS technology with static protection however proper ESD prevention procedures should be used when handling this product. Damage can occur when exposed to extremely high static electrical charge. 2009 Microchip Technology Inc. DS22180B-page 1 RE46C144 CMOS Photoelectric Smoke Detector ASIC with Interconnect R&E International and Timer Mode A Subsidiary of Microchip Technology Inc. Product Specification DC Electrical Characteristics at TA = -25 to 75C, VDD=9V, Typical Application (unless otherwise noted) Limits Symbo Test Min Typ Max Units Parameter l Pin Test Conditions Supply Voltage V 5 Operating 6 12 V DD Supply Current Configured as in Figure 2, I 5 4 6 uA DD1 COSC=VSS Configured as in Figure 2, I 5 5.5 8 uA DD2 VDD=12V, COSC=VSS Configured as in Figure 2, I 5 2 mA DD3 STROBE on, IRED off, VDD=12V Configured as in Figure 2, I 5 STROBE on, IRED on, VDD=12V, 3 mA DD4 Note 1 Input Voltage High V 10 FEED 6.2 4.5 V IH1 V 7 No Local Alarm, IO as an Input 3.2 V IH2 V 15 VSEN 1.6 V IH3 V 16 TEST 8.5 V IH4 Input Voltage Low V 10 FEED 4.5 2.7 V IL1 V 7 No Local Alarm, IO as an Input 1.5 V IL2 V 15 VSEN .5 V IL3 V 16 TEST 7 V IL4 Input Leakage Low VDD=12V, COSC=12V, STROBE I 1,2,3 -100 nA IL1 active I 10, 12 VDD=12V, Vin=VSS -100 nA IL2 I 15,16 VDD=12V, Vin=VSS -1 uA IL3 I 10 FEED=-10V -50 uA LFD Input Leakage High VDD=12V, Vin=VDD, STROBE I 1,2 100 nA IH1 active I 3, 10, 12 VDD=12V, Vin=VDD 100 nA IH2 I 10 FEED=22V 50 uA HFD Input Pull Down Current I 16 Vin=VDD .25 10 uA PD1 I 15 Vin=VDD .1 .25 .5 uA PD2 I 7 Vin=VDD 20 80 uA PDIO1 I 7 Vin=17V, VDD=12 140 uA PDIO2 Output Leakage Current I 11,13 Output Off, Output=VSS -1 uA OZL1 Low Output Leakage Current I 11,13 Output Off, Output=VDD 1 uA OZH1 High Note 1: Does not include Q3 emitter current. 2009 Microchip Technology Inc. DS22180B-page 2