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RE46C180
DS22275A-page 6
?2011 Microchip Technology Inc.
AC ELECTRICAL CHARACTERISTICS
AC Electrical Characteristics: Unless otherwise indicated, all parameters apply at T
A
 = -10癈 to +60癈,
V
DD
= 9V, V
SS
= 0V.
Parameter
Symbol
Test
Pin
Min
Typ
Max
Units
Conditions
Time Base
Internal Oscillator Period     T
POSC
7
593
625
657
祍
Test mode (Note 1)
Internal Clock Period
T
PCLK
9.5
10
10.5
ms
Operating
RLED Indicator
On Time
T
ON1
5
9.5
10
10.5
ms
Operating
Period
T
PLED1
5
304
320
336
s
Standby
T
PLED2
5
0.95
1
1.05
s
Local alarm
T
PLED3
5
9.5
10
10.5
s
HUSH mode, No Local Alarm
GLED Indicator
Period
T
PLED4
3
38
40
42
s
Alarm Memory Indication
GLED period, No Alarm,
no PTT
T
PLED5
3
237
250
263
ms
Alarm Memory Indication
GLED period upon PTT,
AMLEDEn = 1
Off Time
T
OFLED1
3
0.95
1
1.05
s
Alarm Memory Indication
GLED off time between
pulses
T
OFLED2
3
36
38
40
s
Alarm Memory Indication
GLED off time between pulse
trains (3x)
Alarm Memory Indication
Timeout Period
T
AMTO
3
22.8
24
25.2
Hour    AMTO[2:1] = 0 0
45.6
48
50.4
Hour    AMTO[2:1] = 0 1
0
0
0
Hour    AMTO[2:1] = 1 0,
No Alarm Memory Indication




AMTO[2:1] = 1 1,
Alarm Memory Indication
never times out, as long as
Alarm Memory Latch is set
Smoke Check
Smoke Check Time
T
SCT

4.7
5
5.3
ms
Operating
Smoke Check Period
T
PER0

9.5
10
10.5
s
Standby, No Alarm
T
PER1

0.95
1
1.05
s
Standby, after one valid
smoke sample and before
entering Local Alarm, no PTT
T
PER2

237
250
263
ms
Standby, upon start of PTT
and before entering Local
Alarm
T
PER3

0.95
1
1.05
s
Local Alarm (after three con-
secutive valid smoke
samples) or Remote Alarm
Chamber Test Period
T
PCT1

304
320
336
s
Operating
Note  1:   T
POSC
 is 100% production tested. All other timing is verified by functional testing.
2:   See timing diagram for CO alarm horn pattern.
3:   See timing diagram for smoke alarm temporal and non-temporal horn pattern.
4:   See timing diagram for horn synchronization and Auto Alarm Locate (AAL).
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