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MC14468 Datasheet

  • MC14468

  • Low-Power CMOS Ionlzatlon Smoke Detector IC with Interconnec...

  • Motorola   Motorola

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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Freescale Semiconductor, Inc.
Order this document
by MC14468/D
MC14468
Low鈥揚(yáng)ower 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.
鈥?/div>
Ionization Type with On鈥揅hip FET Input Comparator
16
1
P SUFFIX
PLASTIC DIP
CASE 648鈥?8
Freescale Semiconductor, Inc...
鈥?/div>
Piezoelectric Horn Driver
鈥?/div>
Guard Outputs on Both Sides of Detect Input
鈥?/div>
Input鈥揚(yáng)roduction Diodes on the Detect Input
鈥?/div>
Low鈥揃attery Trip Point, Internally Set, can be Altered Via External Resistor
鈥?/div>
Detect Threshold, Internally Set, can be Altered Via External Resistor
鈥?/div>
Pulse Testing for Low Battery Uses LED for Battery Loading
鈥?/div>
Comparator Output for Detect
鈥?/div>
Internal Reverse Battery Protection
鈥?/div>
Strobe Output for External Trim Resistors
鈥?/div>
I/O Pin Allows Up to 40 Units to be Connected for Common Signaling
鈥?/div>
Power鈥揙n Reset Prevents False Alarms on Battery Change
ORDERING INFORMATION
MC14468P PLASTIC DIP
PIN ASSIGNMENT
(16 PIN DIP)
Detect
Comp. Out
I/O
Low V Set
Strobe
Out
LED
V
DD
Timing
Resistor
Feedback
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Guard Hi鈥揨
Detect Input
Guard Lo鈥揨
Sensitivity Set
Osc Capacitor
Silver
Brass
V
SS
MAXIMUM RATINGS*
(Voltages referenced to V
SS
)
Rating
DC Supply Voltage
Input Voltage, All Inputs Except Pin 8
DC Current Drain per Input Pin, Except Pin 15 = 1 mA
DC Current Drain per Output Pin
Operating Temperature Range
Storage Temperature Range
Reverse Battery Time
Symbol
V
DD
V
in
I
I
T
A
T
stg
t
RB
*
0.25 to V
DD
+ 0.25
10
*
0.5 to + 15
30
Value
Unit
V
V
mA
mA
擄C
擄C
s
*
10 to + 60
*
55 to + 125
5.0
* 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 that normal
precautions be taken to avoid application of any voltage higher than maximum rated voltages to this high impedance circuit. For proper operation
(V
in
or V
out
)
V
DD
.
it is recommended that V
in
and V
out
be constrained to the range V
SS
v
v
REV 3
Motorola Sensor
漏
Motorola, Inc. 2000
Device Data
For More Information On This Product,
Go to: www.freescale.com
1

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