RE46C121 R&E International, Inc., RE46C121 Datasheet

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RE46C121

Manufacturer Part Number
RE46C121
Description
CMOS Ionization Smoke Detector ASIC with Interconnect
Manufacturer
R&E International, Inc.
Datasheet

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RE46C121
CMOS Ionization Smoke Detector ASIC with Interconnect
Product Specification
General Description
The RE46C121 is low power CMOS ionization type
smoke detector IC. With few external components this
circuit will provide all the required features for an
ionization type smoke detector.
An internal oscillator strobes power to the smoke
detection circuitry for 10.5mS every 1.66 seconds to
keep standby current to a minimum. A check for a low
battery condition is performed every 40 seconds when
in standby. The temporal horn pattern supports the
NFPA 72 emergency evacuation signal.
An interconnect pin allows multiple detectors to be
connected such that when one unit alarms all units will
sound.
Although this device was designed for smoke detection
utilizing an ionization chamber it can be used in a
variety of security applications.
Utilizing low power CMOS technology the RE46C121
was designed for use in smoke detectors that comply
with Underwriters Laboratory Specification UL217 and
UL268.
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Input Voltage Range Except FEED, IO
FEED Input Voltage Range
IO Input Voltage Range
Reverse Battery Time
Input Current except FEED
Operating Temperature
Storage Temperature
Maximum Junction Temperature
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 8
R&E International
This datasheet contains PROPRIETARY and CONFIDENTIAL information.
Facsimile 610.992.0734
SYMBOL
T
V
V
V
T
V
T
T
I
STG
infd
DD
RB
io1
in
in
A
J
Features
DETCOMP
STROBE
Guard Outputs for Ion Detector Input
+/-0.75pA Detect Input Current
Internal Reverse Battery Protection
Internal Low Battery Detection
Low Quiescent Current Consumption (<6.5uA)
Available in 16L PDIP or 16L N SOIC
ESD Protection on all Pins
Interconnect up to 40 Detectors
Compatible with MC145018
Available in Standard Packaging or RoHS
Complaint Pb Free Packaging
LBADJ
RBIAS
FEED
VDD
LED
IO
Pin Configuration
-.3 to V
-10 to +22
-55 to 125
-10 to 60
-.3 to 17
VALUE
1
2
3
4
5
6
7
8
150
15
10
5
dd
+.3
E-mail: rande@randeint.com
DS-RE46C121-010907
16
15
14
13
12
11
10
9
GUARD2
DETECT
GUARD1
VSEN
OSCAP
HS
HB
VSS
UNITS
mA
°C
°C
°C
V
V
V
V
S

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RE46C121 Summary of contents

Page 1

... RE46C121 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification General Description The RE46C121 is low power CMOS ionization type smoke detector IC. With few external components this circuit will provide all the required features for an ionization type smoke detector. An internal oscillator strobes power to the smoke detection circuitry for 10 ...

Page 2

... Units 4.5 6 6.2 4 4.5 2 -0.75 pA -1.50 pA -50 uA 0. 100 uA 150 6 7.2 7 kΩ 90 130 170 mV E-mail: rande@randeint.com DS-RE46C121-010907 ...

Page 3

... IO as Input, No Local Alarm No Local Alarm input, From IO 2 active to Horn Active Facsimile 610.992.0734 R&E International Limits Min Typ Max Units 1.34 1. 37.5 41.5 45.8 mS 9.1 10.5 12.9 mS 9.1 10.5 12 1.1 S 450 500 550 mS 9.1 10.5 12.9 mS 450 500 550 mS 1.35 1.5 1. 1.34 1.67 2 450 mS .450 2.2 S E-mail: rande@randeint.com DS-RE46C121-010907 ...

Page 4

... RE46C121 CMOS Ionization Smoke Detector ASIC with Interconnect Product Specification Telephone 610.992.0727 Page This datasheet contains PROPRIETARY and CONFIDENTIAL information. Functional Block Diagram Figure 1 Facsimile 610.992.0734 R&E International E-mail: rande@randeint.com DS-RE46C121-010907 ...

Page 5

... Testing - By holding pin 12 (OSCAP) low the internal power strobe is active and pin1 (DETCOMP) can be used to check for smoke. Please refer to the timing diagrams. Telephone 610.992.0727 Page This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 R&E International E-mail: rande@randeint.com DS-RE46C121-010907 ...

Page 6

... C2 should be located as close as possible to the device power pins. 3. Route the pin 8 PC board trace away from pin 7 to avoid coupling. Telephone 610.992.0727 Page This datasheet contains PROPRIETARY and CONFIDENTIAL information. Typical Application Figure 2 Facsimile 610.992.0734 R&E International E-mail: rande@randeint.com DS-RE46C121-010907 ...

Page 7

... See Figure Below for Complete Horn Cycle T IODMP LED supressed in remote alarm mode T IODLY2 Horn pattern not self com pleting for external alarm - see tim ing below for com plete horn cycle T HOF2 Facsimile 610.992.0734 R&E International Pin 15 > Pin 13 Low Battery Warning Chirp E-mail: rande@randeint.com DS-RE46C121-010907 ...

Page 8

... A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness. Telephone 610.992.0727 Page This datasheet contains PROPRIETARY and CONFIDENTIAL information. Facsimile 610.992.0734 R&E International E-mail: rande@randeint.com DS-RE46C121-010907 ...

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