1Motorola Sensor Device Data
Low–Power CMOS
The MC14467–1, 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.
• 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 Outputs for Detect and Low Battery
• Internal Reverse Battery Protection
MAXIMUM RATINGS*
(Voltages referenced to V
SS
)
Rating
Symbol Value Unit
DC Supply Voltage V
DD
0.5 to + 15 V
Input Voltage, All Inputs Except Pin 8 V
in
0.25 to V
DD
+ 0.25 V
DC Current Drain per Input Pin, Except Pin 15 = 1 mA I 10 mA
DC Current Drain per Output Pin I 30 mA
Operating Temperature Range T
A
10 to +60 °C
Storage Temperature Range T
stg
55 to + 125 °C
Reverse Battery Time t
RB
5.0 s
* 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
it is recommended that except for pin 8, V
in
and V
out
be constrained to the range V
SS
(V
in
or V
out
) V
DD
. For pin 8, refer to the Electrical
Characteristics.
Order this document
by MC14467–1/D
SEMICONDUCTOR TECHNICAL DATA
Motorola, Inc. 2000
P SUFFIX
PLASTIC DIP
CASE 648–08
PIN ASSIGNMENT
(16 PIN DIP)
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
Detect
Comp. Out
N/C
Low V Set
Low V
Comp. Out
LED
V
DD
Timing
Resistor
Feedback
Guard Hi–Z
Detect Input
Guard Lo–Z
Sensitivity Set
Osc Capacitor
Silver
Brass
V
SS
ORDERING INFORMATION
MC14467P1 PLASTIC DIP
1
16
REV 3
