RE46C122

CMOS Ionization Smoke Detector ASIC with

R&E International

Interconnect and Timer Mode

A Subsidiary of Microchip Technology Inc.

Product Specification

© 2009 Microchip Technology Inc.

DS22173A-page 3

DC Electrical Characteristics – Continued

Limits

Parameter

Symbol

Test

Pin

Test Conditions

Min

Typ

Max

Units

14,15

Guard Amplifier

-50

50

mV

15,16

Guard Amplifier

-50

50

mV

Offset Voltage

13,15

Smoke Comparator

-50

50

mV

14,15

Guard Amplifier, Note 2

2

V

Common Mode Voltage

13,15

Smoke Comparator, Note 2

.5

V

Output Impedance

14,16

Guard Amplifier Outputs, Note 2

10

k

Ω

Hysteresis

13

No Alarm to Alarm Condition

90

130

170

mV

Note 1: Sample test only.

Note 2: Not 100% production tested.

Note 3: Production test at room with temperature guardbanded limits.

AC Electrical Characteristics at TA = 25°C, VDD=9V, OSCAP=.1uF, RBIAS=8.2MΩ, VSS=0V (unless

otherwise noted)

Limits

Parameter

Symbol

Test

Pin

Test Conditions

Min

Typ

Max

Units

12

No Alarm Condition

1.34

1.67

2

S

Oscillator Period

12

Alarm Condition

37.5

41.5

45.8

mS

Oscillator Pulse Width

5

Operating

9.4

10.5

12.9

mS

LED On Time

5

Operating

9.4

10.5

12.9

mS

5

Standby, No Alarm

32

40

48

S

5

Alarm Condition

.8

1

1.2

S

LED Off Time

5

Timer Mode, No Alarm

8

10

12

S

10,11

Operating, Alarm Condition, Note 4

450

500

550

mS

Horn On Time

10,11

Low Battery, No Alarm

9.4

10.5

12.9

mS

10,11

Operating, Alarm Condition, Note 4

450

500

550

mS

10,11

Operating, Alarm Condition, Note 4

1.35

1.5

1.65

S

Horn Off Time

10,11

Low Battery, No Alarm

32

40

48

S

IO Charge Dump Duration

2

At Conclusion of Local Alarm or Test

1.34

1.67

2.0

S

IO Delay

2

From Start of Local Alarm to IO Active

3

S

IO Filter

2

IO pulse width guaranteed to be filtered.

IO as Input, No Local Alarm

450

mS

Remote Alarm Delay

2

No Local Alarm, IO as input, From IO

active to Horn Active

.450

2.2

S

Timer Period

4

No Alarm

8

10

12

Min

Note 4 – See timing diagram for horn temporal pattern.