R&E International A Subsidiary of Microchip Technology Inc. RE46C127 CMOS Ionization Smoke Detector ASIC with Interconnect and Timer Mode Product Specification Features General Description Guard Outputs for Ion Detector Input The RE46C127 is low power CMOS ionization type +/-0.75pA Detect Input Current smoke detector IC. With few external components this Internal Reverse Battery Protection circuit will provide all the required features for an ionization type smoke detector. Low Quiescent Current Consumption (<6.5uA) Available in 16L PDIP or 16L N SOIC An internal oscillator strobes power to the smoke ESD Protection on all Pins detection circuitry for 10.5mS every 1.66 seconds to Internal Low Battery Detection keep standby current to a minimum. A check for a low Interconnect up to 40 Detectors battery condition is performed every 40 seconds when 8 Minute Timer for Sensitivity Control in standby. A 2/3 duty cycle continuous horn pattern is Compatible with Allegro A5348 used for the alarm condition. UL Recognized per File S24036 Available in Standard Packaging or RoHS Compliant An interconnect pin allows multiple detectors to be Pb Free Packaging. connected such that when one units alarms all units will sound. Pin Configuration An internal 8 minute timer allows for a separate button TSTART GUARD2 to be used for reduced sensitivity mode. 1 16 IO DETECT 2 15 Although this device was designed for smoke detection utilizing an ionization chamber it could be used in a LBADJ GUARD1 3 14 variety of security applications. TSTROBE VSEN 4 13 The RE46C127 is recognized by Underwriters OSCAP LED 5 12 Laboratories for use in smoke detectors that comply with specification UL217 and UL268. HS VDD 6 11 RBIAS HB 7 10 VSS FEED 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 Reverse Battery Time T 5 S RB Input Current except FEED I 10 mA in Operating Temperature T -10 to 60 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. DS22174B-page 1 RE46C127 CMOS Ionization Smoke Detector ASIC with R&E International Interconnect and Timer Mode A Subsidiary of Microchip Technology Inc. Product Specification DC Electrical Characteristics at TA = 25C, VDD=9V, OSCAP=.1uF, RBIAS=8.2M , VSS=0V (unless otherwise noted) Limits Test Min Typ Max Units Parameter Symbol Pin Test Conditions Supply Voltage V 6 Operating 6 12 V DD Supply Current I 6 RBIAS=8.2M , OSCAP=.1uF 4 6.5 uA DD1 I 6 RBIAS=8.2M , OSCAP=.1uF Vdd=12V 9 uA DD2 Input Voltage High V 8 6.2 4.5 V IH1 V 2 No Local Alarm, IO as an Input 3 V IH2 V 1 4.5 V IH3 Input Voltage Low V 8 4.5 2.7 V IL1 V 2 No Local Alarm, IO as an Input 1 V IL2 V 1 2.5 V IL3 Input Leakage Low IL 15 VDD=9V, DETECT=VSS, 0-40% RH -0.75 pA DET1 VDD=9V, DETECT=VSS, 85% RH IL 15 -1.50 pA DET2 Note 1 FEED=-10V IL 8 -50 uA FD Input Leakage High VDD=9V, DETECT=VDD, 0-40% RH IH 15 0.75 pA DET1 VDD=9V, DETECT=VDD, 85% RH IH 15 1.50 pA DET2 Note 1 IH 8 FEED=22V 50 uA FD No Alarm, Vio=17V I 2 150 uA IOL2 Output Off Leakage High Outputs Off I 4,5 1 uA IOHZ Input Pull Down Current I 1 TSTART=9V 20 50 80 uA PD1 Output High Voltage V 10,11 IOH=-16mA, VDD=7.2V 6.3 V OH1 Output Low Voltage V 10,11 IOL=16mA, VDD=7.2V .9 V OL1 IOL=500ua V 4 .5 V OL2 V 5 IOL=10mA, VDD=7.2V 1 V OL3 Output Current I 2 No Alarm, Vio=Vdd-2V 25 60 uA IOL1 I 2 Alarm, Vio=Vdd-2V or Vio=0V -4 -16 mA IOH1 At Conclusion of Local Alarm or Test, I 2 5 mA IODMP Vio=1V Low Battery Voltage T =-10 to 60C, Note 3 V 6 A 7.2 7.5 7.8 V LB Internal Sensitivity Set Voltage V 13 48.5 50 51.5 %V SET1 DD V 3 65.5 %V SET2 DD 2009 Microchip Technology Inc. DS22174B-page 2