R&E International A Subsidiary of Microchip Technology Inc. RE46C140 CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode Product Specification Features General Description Internal Power On Reset The RE46C140 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. Temporal 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 A5366 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 temporal horn pattern supports the NFPA C1 TEST 1 16 72 emergency evacuation signal. C2 VSEN 2 15 An interconnect pin allows multiple detectors to be DETECT VSS 3 14 connected such that when one units alarms, all units 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 RE46C140 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 STG C Maximum Junction Temperature T 150 J C 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. DS22179B-page 1 RE46C140 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 Test Min Typ Max Units Parameter Symbol Pin Test Conditions Supply Voltage V 5 Operating 6 12 V DD Supply Current Configured as in Figure 2, 5 I 4 6 uA DD1 COSC=VSS, LED off Configured as in Figure 2, VDD=12V, I 5 5.5 8 uA DD2 COSC=VSS Configured as in Figure 2, STROBE 5 I 2 mA DD3 on, IRED off, VDD=12V Configured as in Figure 2, STROBE I 5 3 mA DD4 on, IRED on, VDD=12V, Note 1 Input Voltage High 10 V 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 10 VFEED 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 1,2,3 I -100 nA IL1 active I 12,10 VDD=12V, Vin=VSS -100 nA IL2 15,16 I VDD=12V, Vin=VSS -1 uA IL3 10 I FEED=-10V -50 uA LFD Input Leakage High I 1,2 VDD=12V, Vin=VDD, STROBE active 100 nA IH1 I 3,12,10 VDD=12V, Vin=VDD 100 nA IH2 I 10 FEED=22V 50 uA HFD Input Pull Down Current 16 I 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 11,13 I 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. DS22179B-page 2