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Freescale Semiconductor Electronic Components Datasheet

MC14468 Datasheet

Low-Power CMOS Ionization Smoke Detector IC

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MC14468 pdf
Freescale Semiconductor
Technical Data
Low-Power CMOS Ionization Smoke
Detector IC with Interconnect
The MC14468, when used with an ionization chamber and a small number of
external components, will detect smoke. When smoke is sensed, an alarm is
sounded via an external piezoelectric transducer and internal drivers. This circuit
is designed to operate in smoke detector systems that comply with UL217 and
UL268 specifications.
Features
• Ionization Type with On-Chip FET Input Comparator
• Piezoelectric Horn Driver
• Guard Outputs on Both Sides of Detect Input
• Input-Production Diodes on the Detect Input
• Low-Battery Trip Point, Internally Set, can be Altered Via External Resistor
• Detect Threshold, Internally Set, can be Altered Via External Resistor
• Pulse Testing for Low Battery Uses LED for Battery Loading
• Comparator Output for Detect
• Internal Reverse Battery Protection
• Strobe Output for External Trim Resistors
• I/O Pin Allows Up to 40 Units to be Connected for Common Signaling
• Power-On Reset Prevents False Alarms on Battery Change
• Pb-Free Packaging Designated by Suffix Code ED
Device
MC14468P
MC14468ED
ORDERING INFORMATION
Temperature
Range
Case No.
10° to 60°C
648-08
Package
Plastic Dip
Document Number: MC14468
Rev 5.0, 11/2006
MC14468
LOW-POWER CMOS
IONIZATION SMOKE
DETECTOR IC
WITH INTERCONNECT
P SUFFIX
ED SUFFIX (PB-FREE)
16-LEAD PLASTIC DIP
CASE 648-08
DETECT
COMP. OUT
I/O
LOW V SET
STROBE
OUT
LED
VDD
TIMING
RESISTOR
FEEDBACK
1
2
3
4
5
6
7
8
16 GUARD HI-Z
15 DETECT INPUT
14 GUARD LO-Z
13
SENSITIVITY
SET
12
OSC
CAPACITOR
11 SILVER
10 BRASS
9 VSS
Figure 1. Pin Connections
© Freescale Semiconductor, Inc., 2006. All rights reserved.


Freescale Semiconductor Electronic Components Datasheet

MC14468 Datasheet

Low-Power CMOS Ionization Smoke Detector IC

No Preview Available !

MC14468 pdf
To Other Units
VDD VDD
I/O FEEDBACK
28
45 K
LOW V SET 3
DETECT
1
COMPARATOR OUT
13
325 K
STROBE OUT 4
280 K
Low-Battery
Comparator
+
Detect
Comparator
+
15 DETECT INPUT
Guard
Amp
+
LO-Z
14
VDD
Alarm
Logic
Power-On
Reset
OSC
HI-Z
and
Timing
16
12 7
11 SILVER
10 BRASS
5 LED
VDD = Pin 6
VSS = Pin 9
VDD
Figure 2. Block Diagram
Table 1. Maximum Ratings(1)
(Voltages referenced to VSS)
Rating
Symbol
Value
Unit
DC Supply Voltage
Input Voltage, All Inputs Except Pin 8
DC Current Drain per Input Pin, Except Pin 15 = 1 mA
VDD –0.5 to +15
V
VIN –0.25 to VDD + 0.25
V
I 10 mA
DC Current Drain per Output Pin
I 30 mA
Operating Temperature Range
Storage Temperature Range
Reverse Battery Time
TA
TSTG
tRB
–10 to +60
–55 to +125
5.0
°C
°C
s
1. Maximum Ratings are those values beyond which damage to the device may occur. This device contains circuitry to protect the inputs against
damage due to high static voltages or electric fields; however, it is advised normal precautions be taken to avoid application of any voltage
higher than maximum rated voltages to this high impedance circuit. For proper operation it is recommended VIN and VOUT be constrained to
the range VSS (VIN or VOUT) VDD.
MC14468
2
Sensors
Freescale Semiconductor


Part Number MC14468
Description Low-Power CMOS Ionization Smoke Detector IC
Maker Freescale Semiconductor
Total Page 9 Pages
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