 2010 Microchip Technology Inc.

DS22251A-page 7

RE46C165/6/7/8

AC ELECTRICAL CHARACTERISTICS

AC Electrical Characteristics:

Parameter

Symbol

Test

Pin

Min

Typ

Max

Units

Clocks

Conditions

Oscillator Time Base (COSC, ROSC)

Oscillator Period

9

9.38

10.42 11.46

ms

1

Operating, Note 1

Oscillator Tolerance

9

-10

0

10

%

1

Operating

LED Indication (LED)

LED On Time

11

9.4

10.4

11.5

ms

1

Operating

LED Period

11

LED IS NOT ON

s

—

Remote alarm only

11

38

43

47

s

4096

Standby, no alarm

11

450

500

550

ms

48

Local alarm condition

11

9.6

10.7

11.7

s

1024

Timer mode, no local alarm

11

225

250

275

ms

24

Timer mode, no local alarm

Alarm Memory LED

Pulse Train (3x)

Off Time

11

1.2

1.3

1.5

s

127

Alarm memory set,

LED enabled

Alarm Memory LED

Timer Period

11

21.5

23.9

26.3

Hours 8257536 Alarm memory set

Detection (STROBE, IRED)

STROBE On Time

4

9.4

10.4

11.5

ms

1

Smoke test,

Chamber test

IRED On Time

6

94

104

114

µs

0.01

Operating/DIAG, Note 1

Note 1:

2:

See timing diagram for Horn Temporal Pattern in Figure 3-2.

3:

See timing diagram for Horn Continuous Pattern in Figure 3-3.

4:

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

conclusion of the Timer mode.