A5364

NC

I/O

LOW-V SET

NC

LED

VDD

TIMING RES

FEEDBACK

GUARD2

DETECT IN

GUARD1

SENSITIVITY SET

OSC CAP

HORN2

HORN1

VSS

To / from

other units

9

10

11

12

13

14

15

16

200 kΩ

200 k Ω

200 Ω

8.2 MΩ

1 μF

0.1 μF

1.5 MΩ

220 kΩ

Push

to Test

0.001 μF

330 Ω

9 V

A

B

C

C

C

A

B

Use an external resistor to adjust

sensitivity for a particular smoke chamber.

C

A resistor to VSS or VDD may

be added to this pin to modify

low battery voltage threshold.

Value of component will vary, based on

the piezoelectric horn used.

1

2

3

4

5

6

7

8

Description

The A5364 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 their alarm. In addition, special features are incorporated

to facilitate alignment and test of the finished smoke detector.

The device is Recognized by Underwriters Laboratories for use

in smoke alarms that comply with Standard UL217.

The internal oscillator and timing circuitry keep standby power

to a minimum by powering down the device for 1.66 seconds

and sensing for smoke for only 10 ms. Every 24 on-off cycles,

a check is made for a 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 A5364 is supplied in a low-cost 16-pin dual in-line plastic

package (DIP). It is rated for continuous operation over the

temperature range of 0°C to 50°C. The Pb (lead) free version

(suffix –T) has 100% matte tin leadframe plating.

26110.7E

Features and Benefits

▪ Low average standby current for long battery life

▪ Interconnect up to 125 detectors

▪ Piezoelectric horn driver

▪ Guard outputs for detector input

▪ Pulse testing for low battery

▪ Power-on reset (POR)

▪ Internal reverse battery protection

▪ Built-in hysteresis reduces false triggering

▪ Temporal horn pattern, per UL217, NFPA72, and ISO8201

▪ UL Recognized for UL217 applications, per file # S2113

Ionization Smoke Detector

with Interconnect

Typical Application

Not to scale

A5364

Package: 16-pin DIP (suffix A)