MC14468 Datasheet, PDF (1/9 Pages) Motorola, Inc – LONIZATION SMOKE DETECTOR IC WITH INTERCONNECT

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
1
I/O ²
LOW V SET 3
STROBE
OUT
4
LED ⁵
VDD 6
TIMING
RESISTOR
7
FEEDBACK 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.