RE46C121 datasheet(3/7 Pages) MICROCHIP

Part #	RE46C121

Description	CMOS Ionization Smoke Detector ASIC with Interconnect

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Manufacturer	MICROCHIP [Microchip Technology]

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RE46C120

CMOS Ionization Smoke Detector ASIC

R&E International

Product Specification

A Subsidiary of Microchip Technology Inc.

DS22157A-page 3

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

otherwise noted)

Limits

Parameter

Symbol

Test

Test Conditions

Min

Typ

Max

Units

TPER1

12

No Alarm Condition

1.34

1.67

2

S

Oscillator Period

TPER2

12

Alarm Condition

37.5

41.5

45.8

mS

Oscillator Pulse Width

TPW

5

Operating

9.1

10.5

12.9

mS

LED On Time

TLON

5

Operating

9.1

10.5

12.9

mS

TLOF1

5

Standby, No Alarm

32

40

48

S

LED Off Time

TLOF2

5

Alarm Condition

.9

1

1.1

S

THON1

10,11

Operating, Alarm Condition, Note 4,

TONE=VDD or Float

450

500

550

mS

THON2

10,11

Low Battery, No Alarm

9.1

10.5

12.9

mS

Horn On Time

THON3

10,11

Operating, Alarm Condition, TONE=Low

150

166

183

mS

THOF1

10,11

Operating, Alarm Condition, Note 4,

TONE=VDD or Float

450

500

550

mS

THOF2

10,11

Operating, Alarm Condition, Note 4,

TONE=VDD or Float

1.35

1.5

1.65

S

THOF3

10,11

Operating, Alarm Condition, TONE=Low

75

83

92

mS

Horn Off Time

THOF4

10,11

Low Battery, No Alarm

32

40

48

S

Note 4: See timing diagram for Horn Temporal Pattern

Functional Block Diagram

Figure 1

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