SMOKE DETECTOR

WITH INTERCONNECT AND TIMER

Always order by complete part number:

A5347CA .

5347

FEATURES

s Interconnect Up to 125 Detectors

s Piezoelectric Horn Driver

s Guard Outputs for Detector Input

s Pulse Testing for Low Battery

s Power-ON Reset

s Internal Timer & Control for Reduced Sensitivity

s Built-In Hysteresis Reduces False Triggering

ABSOLUTE MAXIMUM RATINGS

(Voltages are referenced to V

Supply Voltage Range,

V

DD

................................ -0.5 V to +15 V

Input Voltage Range,

V

IN

........................ -0.3 V to V

DD

+ 0.3 V

Input Current, I

IN

............................... 10 mA

Operating Temperature Range,

T

A

..................................... 0

Storage Temperature Range,

T

S

............................... -55

CAUTION: CMOS devices have input static

protection but are susceptible to damage when

exposed to extremely high static electrical

charges.

1

2

3

4

5

6

7

89

10

11

12

13

14

15

16

LOGIC

OSC. &

TIMING

HORN

DRIVER

GUARD

DETECT. IN

GUARD

SENSITIVITY

SET

OSC. CAP.

HORN

HORN

– SUPPLY

TIMER START

I / O

LOW-V SET

TIMER OUT

LED

+ SUPPLY

TIMING RES.

FEEDBACK

1

Dwg. PC-004

2

2

1

The A5347CA is a low-current, CMOS circuit providing all of the

required features for an ionization-type smoke detector. A networking

capability allows as many as 125 units to be interconnected so that if

any unit senses smoke, all units will sound an alarm. In addition,

special features are incorporated to facilitate alignment and test of the

finished smoke detector. This device is designed to comply with

Underwriters Laboratories Specification UL217.

The internal oscillator and timing circuitry keeps standby power to

a minimum by powering down the device for 1.66 seconds and sensing

smoke for only 10 ms. Every 24 on/off cycles, a check is made for low

battery condition. By substituting other types of sensors, or a switch

for the ionization detector, this very-low power device can be used in

numerous other battery-operated safety/security applications.

The A5347CA is supplied in a low-cost, 16-pin dual in-line plastic

package. It is rated for continuous operation over the temperature

range of 0

°C to +50°C.