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R&E International
RE46C144
CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode Product Specification
General Description
The RE46C144 is low power CMOS photoelectric type smoke detector IC. With minimal external components this circuit will provide all the required features for a photoelectric type smoke detector. The design incorporates a gain selectable photo amplifier for use with an infrared emitter/detector pair. An internal oscillator strobes power to the smoke detection circuitry for 100us every 10 seconds to keep standby current to a minimum. If smoke is sensed the detection rate is increased to verify an alarm condition. A high gain mode is available for push button chamber testing. 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 cycle. An interconnect pin allows multiple detectors to be connected such that when one units alarms, all units will sound. An internal 10 minute timer can be used for a reduced sensitivity mode. Utilizing low power CMOS technology the RE46C144 was designed for use in smoke detectors that comply with Underwriters Laboratory Specification UL217 and UL268.
Features
• • • • • • • • • • Internal Power On Reset Low Quiescent Current Consumption Available in 16L PDIP or 16L N SOIC ESD Protection on all Pins Interconnect up to 40 Detectors 10 Minute Timer for Sensitivity Control 75% Duty Cycle Horn Pattern Internal Low Battery and Chamber Test Compatible with Allegro A5358 Available in Standard Packaging or RoHS Compliant Pb Free Packaging.
Pin Configuration
C1 C2 DETECT STROBE VDD IRED IO HORNB
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
TEST VSEN VSS ROSC COSC LED FEED HORNS
ABSOLUTE MAXIMUM RATINGS
PARAMETER Supply Voltage Input Voltage Range Except FEED, IO FEED Input Voltage Range IO Input Voltage Range Input Current except FEED Operating Temperature Storage Temperature Maximum Junction Temperature SYMBOL VDD Vin Vinfd Vio1 Iin TA TSTG TJ VALUE 15 -.3 to Vdd +.3 -10 to +22 -.3 to 17 10 -25 to 75 -55 to 125 150 UNITS V V V V mA °C °C °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.
Telephone 610.992.0727 Page 1 of 12
E-mail:
[email protected] DS-RE46C144-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information.
Facsimile 610.992.0734
RE46C144
CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode Preliminary Product Specification R&E International
DC Electrical Characteristics at TA = -25° to 75°C, VDD=9V, Typical Application (unless otherwise noted)
Parameter
Supply Voltage Supply Current
Symbo l
VDD IDD1 IDD2 IDD3 IDD4
Test Pin
5 5 5 5 5 10 7 15 16 10 7 15 16 1,2,3 10, 12 15,16 10 1,2 3, 10, 12 10 16 15 7 7 11,13 11,13
Test Conditions
Operating Configured as in Figure 2, COSC=VSS Configured as in Figure 2, VDD=12V, COSC=VSS Configured as in Figure 2, STROBE on, IRED off, VDD=12V Configured as in Figure 2, STROBE on, IRED on, VDD=12V, Note 1 FEED No Local Alarm, IO as an Input VSEN TEST FEED No Local Alarm, IO as an Input VSEN TEST VDD=12V, COSC=12V, STROBE active VDD=12V, Vin=VSS VDD=12V, Vin=VSS FEED=-10V VDD=12V, Vin=VDD, STROBE active VDD=12V, Vin=VDD FEED=22V Vin=VDD Vin=VDD Vin=VDD Vin=17V, VDD=12 Output Off, Output=VSS Output Off, Output=VDD
Min
6
Limits Typ Max
12 4 5.5 6 8 2 3
Units
V uA uA mA mA V V V V
Input Voltage High
VIH1 VIH2 VIH3 VIH4
6.2 3.2 1.6 8.5
4.5
Input Voltage Low
VIL1 VIL2 VIL3 VIL4
4.5
2.7 1.5 .5 7 -100 -100 -1 -50 100 100 50
V V V V nA nA uA uA nA nA uA uA uA uA uA uA uA
Input Leakage Low
IIL1 IIL2 IIL3 ILFD
Input Leakage High
IIH1 IIH2 IHFD
Input Pull Down Current
IPD1 IPD2 IPDIO1 IPDIO2
.25 .1 20 .25
10 .5 80 140 -1 1
Output Leakage Current Low Output Leakage Current High
IOZL1 IOZH1
Note 1: Does not include Q3 emitter current.
Telephone 610.992.0727 Page 2 of 12
E-mail:
[email protected] DS-RE46C144-121806 This datasheet contains PROPRIETARY and CONFIDENTIAL information.
Facsimile 610.992.0734
RE46C144
CMOS Photoelectric Smoke Detector ASIC with Interconnect and Timer Mode Preliminary Product Specification R&E International
DC Electrical Characteristics (continued) at TA= -25° to 75°, VDD=9V, Typical Application (unless otherwise noted) Parameter
Output Voltage Low
Symbol
VOL1 VOL2 VOL3
Test Pin
8,9 13 11 8,9 7 7 5 4 4 6 6 1,2,3 4 6 4,5 6,5
Test Conditions
Iol=16mA, VDD=6.5V Iol=5mA, VDD=6.5V Iol=10mA, VDD=6.5V Iol=-16mA, VDD=6.5V Alarm, Vio=Vdd-2V or Vio=0V At Conclusion of Local Alarm or Test, Vio=1V STROBE off, VDD=12V, Iout=-1uA STROBE on, VD.