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DS22181C-page 5

RE46C145

AC ELECTRICAL CHARACTERISTICS

AC Electrical Characteristics:

Parameter

Symbol

Test

Pin

Min

Typ

Max

Units

Test Conditions

Oscillator Period

12

9.4

10.5

11.5

ms

No alarm condition

LED and STROBE

On Time

11,4

9.4

10.5

11.5

ms

Operating

LED Period

11

39

43

47

s

Standby, no alarm

11

.45

.5

.55

s

Local alarm condition

11

9.6

10.75

11.8

s

Timer mode, no local alarm

11

LED IS NOT ON

s

Remote alarm only

STROBE

and IRED Pulse

Period

4,6

9.6

10.75

11.8

s

Standby, no alarm

4,6

1.8

2

2.2

s

Standby, after one valid smoke

sample

4,6

.9

1

1.1

s

Standby, after two consecutive

valid smoke samples

4,6

.9

1

1.1

s

In Local Alarm (three consecu-

tive valid smoke samples)

4,6

7.2

8

8.9

s

In Remote Alarm

4,6

300

336

370

ms

Push-button test

4,6

39

47

s

Chamber Test or Low Battery

Test, no alarms

IRED On Time

6

94

104

115

µs

Operating

Horn On Time

8,9

450

500

550

ms

Operating, alarm condition,

Note 1

8,9

9.5

10.5

11.5

ms

Low Battery or Failed Chamber

test , no alarm

Horn Off Time

8,9

450

500

550

ms

Operating, alarm condition,

Note 1

8,9

1.35

1.5

1.65

s

Operating, alarm condition,

Note 1

8,9

39

43

47

s

Low Battery or Failed Chamber

test, no alarm

IO Charge

Dump Duration

7

.9

1.46

s

At the conclusion of the Local

Alarm or Test

IO Delay

7

0

s

From start of Local Alarm to

IO Active

IO Filter

7

600

mSs

IO pulse-width ensured to be

filtered. IO as input, no local

alarm

Remote

Alarm Delay

7

1.05

2.0

s

No local alarm, from IO Active

to Horn Active

Timer Period

7

8.5

10

Min

No alarm condition, Note 2

Note 1:

See timing diagram for Horn Temporal Pattern

2:

During the Timer mode, the LED period is 10.5 seconds. The LED period will return to 43 seconds at the

conclusion of the Timer mode.

3:

4:

Typical values are for design information and are not ensured.