4–9
Motorola Sensor Device Data
For More Information On This Product,
Go to: www.freescale.com
Low–Power CMOS
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.
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
MAXIMUM RATINGS*
(Voltages referenced to VSS)
Rating
Symbol
Value
Unit
DC Supply Voltage
VDD
Vin
I
0.5 to + 15
V
Input Voltage, All Inputs Except Pin 8
0.25 to VDD + 0.25
10
V
DC Current Drain per Input Pin, Except Pin 15 = 1 mA
mA
DC Current Drain per Output Pin
I
30
mA
Operating Temperature Range
TA
Tstg
tRB
10 to + 60
°
C
Storage Temperature Range
55 to + 125
°
C
Reverse Battery Time
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 Vin and Vout be constrained to the range VSS
(Vin or Vout)
VDD.
SEMICONDUCTOR TECHNICAL DATA
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
I/O
Low V Set
Strobe
Out
LED
VDD
Timing
Resistor
Feedback
Guard Hi–Z
Detect Input
Guard Lo–Z
Sensitivity Set
Osc Capacitor
Silver
Brass
VSS
ORDERING INFORMATION
MC14468P
PLASTIC DIP
1
16
REV 3
F
Freescale Semiconductor, Inc.
n
.