RE46C143

CMOS Photoelectric Smoke Detector ASIC with Interconnect

R&E International

Product Specification

A Subsidiary of Microchip Technology Inc.

© 2009 Microchip Technology Inc.

DS22178A-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

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

38

43

47

S

11

Local Alarm Condition

.6

.67

.74

S

LED Period

11

Remote Alarm Only

LED IS NOT ON

S

4,6

Standby, No Alarm

9.7

10.5

11.8

S

4,6

Standby, After 1 Valid Smoke

Sample

2.42

2.7

2.96

S

4,6

Standby, After 2 Consecutive Valid

Smoke Samples

1.21

1.33

1.47

S

4,6

In Local Alarm – (3 Consecutive

Valid Smoke Samples)

1.21

1.33

1.47

S

4,6

In Remote Alarm

9.7

10.5

11.8

S

4,6

Pushbutton Test

336

mS

STROBE and IRED Pulse

Period

4,6

Chamber Test or Low Battery

Test, no Alarms

39

47

S

IRED On Time

6

94

104

115

uS

8,9

Operating, Alarm Condition, Note 1

227

252

277

mS

Horn On Time

8,9

Low Battery or Failed Chamber

Test , No Alarm

9.5

10.5

11.5

mS

8,9

Operating, Alarm Condition, Note 1

76

84

92

mS

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

.91

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

.75

1.65

S

Note 1 – See timing diagram for Horn Temporal Pattern

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.