R&E International A Subsidiary of Microchip Technology Inc. RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect Product Specification Features General Description Internal Power On Reset The RE46C143 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 75% Duty Cycle Horn Pattern amplifier for use with an infrared emitter/detector pair. Low Battery and Chamber Test An internal oscillator strobes power to the smoke Compatible with Motorola MC145010 detection circuitry for 100us every 8.1 seconds to keep UL Recognized per File S24036 standby current to a minimum. If smoke is sensed the Available in Standard Packaging or RoHS detection rate is increased to verify an alarm condition. Compliant Pb Free Packaging. A high gain mode is available for push button chamber testing. Pin Configuration A check for a low battery condition and chamber integrity is performed every 40 seconds when in TEST C1 1 16 standby. The alarm horn pattern utilizes a 75% duty cycle. C2 LBSET 2 15 DETECT VSS 3 14 An interconnect pin allows multiple detectors to be connected such that when one units alarms, all units STROBE ROSC 4 13 will sound. COSC VDD 5 12 The RE46C143 is recognized by Underwriters LED IRED 6 11 Laboratories for use in smoke detectors that comply with specification UL217 and UL268. IO FEED 7 10 HORNB HORNS 8 9 ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL VALUE UNITS Supply Voltage V 12.5 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 A C Storage Temperature T -55 to 125 STG C 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. DS22178B-page 1 RE46C143 CMOS Photoelectric Smoke Detector ASIC with Interconnect R&E International Product Specification A Subsidiary of Microchip Technology Inc. DC Electrical Characteristics at TA = -25 to 75C, VDD=9V, Typical Application (unless otherwise noted) Limits Test Parameter Symbol Pin Test Conditions Min Typ Max Units 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 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 16 TEST 7 V IL4 Input Leakage Low VDD=12V, COSC=12V, STROBE I 1,2,3 -100 nA IL1 active I 12,15 VDD=12V, Vin=VSS -100 nA IL2 I 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 3,12,15 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 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. DS22178B-page 2