A5358
Photoelectric Smoke Detector
with Interconnect and Timer
AC ELECTRICAL CHARACTERISTICS (continued) at TA = –25°C to 75°C1, VSS = 0 V, in typical application (unless otherwise noted)
Characteristic
Symbol
Test Conditions
Test Pin VDD Min. Typ.2 Max. Units
tired1
No local or remote smoke
6
9
9.6
–
11.9
s
tired2
After 1 of 3 valid samples
6
9
2.42 2.70 2.96
s
IRED Pulse Period
tired3
After 2 of 3 valid samples and during local
alarm
6
9
1.21 1.34 1.47
s
tired4
Remote smoke only
6
9
9.67 10.8 11.8
s
tired5
Chamber test, no local alarm
6
9
38.9
–
47.1
s
tired6
Pushbutton test, induced alarm
6
9
300 336 370 ms
IRED Pulse Width
tw(ired)
6
9
94
–
116 μs
IRED Rise Time
tr(ired)
10% to 90%
6
–
–
30
μs
IRED Fall Time
tf(ired)
90% to 10%
6
–
–
200 μs
I/O to Active Delay
td(io)
Local alarm
7
9
–
0
–
s
Rising Edge on I/O to Alarm
tr(io)
No local alarm
7
9
–
–
13 ×
tOSC
s
Horn Warning Pulse Period
thorn
Low battery or degraded chamber sensitivity
8, 9
9
38.9
–
47.1
s
Horn Warning Pulse Width
tw(horn)
Low battery or degraded chamber sensitivity
8, 9
9
9.5
–
11.5 ms
Horn On-Time
ton(horn)
Local or remote alarm
8, 9
9
–
252
–
ms
Horn Off-Time
toff(horn)
Local or remote alarm
8, 9
9
–
84
–
ms
1Limits over the operating temperature range are based on characterization data. Characteristics are production tested at 25°C only.
2Typical values are at 25°C and are given for circuit design information only.
Allegro MicroSystems, Inc.
6
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com