RE46C140

CMOS Photoelectric Smoke Detector ASIC with Interconnect

R&E International

and Timer Mode

A Subsidiary of Microchip Technology Inc.

Product Specification

2009 © Microchip Technology Inc.

DS22179A-page 4

AC Electrical Characteristics at TA =-25° to 75°, VDD=9V, VSS=0V, Component Values from Figure 2 ;

R9=100KΩ, R12=10MΩ, C5= 1.5nF(unless otherwise noted)

Limits

Parameter

Symbol

Test

Pin

Test Conditions

Min

Typ

Max

Units

Oscillator Period

12

No Alarm Condition

9.4

10.5

11.5

mS

LED and STROBE On Time

11,4

Operating

9.4

10.5

11.5

mS

11

Standby, No Alarm

39

43

47

S

11

Local Alarm Condition

.45

.5

.55

S

11

Timer Mode, No Local Alarm

9.6

10.75

11.8

S

LED Period

11

Remote Alarm Only

LED IS NOT ON

S

4,6

Standby, No Alarm

9.6

10.75

11.8

S

4,6

Standby, After 1 Valid Smoke

Sample

1.8

2

2.2

S

4,6

Standby, After 2 Consecutive Valid

Smoke Samples

.9

1

1.1

S

4,6

In Local Alarm – (3 Consecutive

Valid Smoke Samples)

.9

1

1.1

S

4,6

In Remote Alarm

7.2

8

8.9

S

4,6

Pushbutton Test

300

336

370

mS

STROBE and IRED Pulse

Period

4,6

Chamber Test or Low Battery

Test, no Alarms

38.9

47.1

S

IRED On Time

6

Operating

94

104

115

uS

8,9

450

500

550

mS

Horn On Time

8,9

Low Battery or Failed Chamber

Test , No Alarm

9.5

10.5

11.5

mS

8,9

450

500

550

mS

8,9

1.35

1.5

1.65

S

Horn Off Time

8,9

Low Battery or Failed Chamber

Test, No Alarm

39

43

47

S

IO Charge Dump Duration

7

At Conclusion of Local Alarm or

Test Alarm

.9

1.46

S

IO Delay

7

From Start of Local Alarm to IO

Active

0

S

IO Filter

7

IO pulse width guaranteed to be

filtered. IO as Input, No Local

Alarm

600

mS

Remote Alarm Delay

7

No Local Alarm, From IO Active

Horn Active

1.05

2.0

S

Timer Period

No Alarm Condition, Note 2

8

10

12

Min

Note 1 – See timing diagram for Horn Temporal Pattern

Note 2 – During the timer mode the LED Period is 10.5 seconds. The LED period will return to a 43 seconds at the conclusion of the timer

mode.

Typical values are for design information and are not guaranteed.

Limits over the specified temperature range are not production tested and are based on characterization data.