A5366
Photoelectric Smoke Detector
with Interconnect and Timer
AC ELECTRICAL CHARACTERISTICS (continued)
at T
A
= –25°C to 75°C
1
,
V
SS
= 0 V, in typical application (unless otherwise noted)
Characteristic
Symbol
t
ired1
t
ired2
IRED Pulse Period
t
ired3
t
ired4
t
ired5
t
ired6
IRED Pulse Width
IRED Rise Time
IRED Fall Time
I/O to Active Delay
I/O Charge Dump Duration
Rising Edge on I/O to Alarm
Horn Warning Pulse Period
Horn Warning Pulse Width
Horn On-Time
t
w(ired)
t
r(ired)
t
f(ired)
t
d(io)
t
dump
t
r(io)
t
horn
t
w(horn)
t
on(horn)
t
off1(horn)
Horn Off-Time
t
off2(horn)
1
Limits
2
Typical
Test Conditions
No local or remote smoke
After 1 of 3 valid samples
After 2 of 3 valid samples and during local
alarm
Remote smoke only
Chamber test, no local alarm
Pushbutton test, induced alarm
10% to 90%
90% to 10%
Local alarm
End of local alarm or test
No local alarm
Low battery or degraded chamber sensitivity
Low battery or degraded chamber sensitivity
Local or remote alarm
Local or remote alarm (see Timing Diagrams
section)
Local or remote alarm (see Timing Diagrams
section)
Test Pin
6
6
6
6
6
6
6
6
6
7
7
7
8, 9
8, 9
8, 9
8, 9
8, 9
V
DD
9
9
9
9
9
9
9
Min.
9.6
1.8
0.8
7.2
38.9
225
94
–
–
Typ.
2
–
2.0
1.0
8.0
–
252
–
–
–
0
1.0
–
–
–
500
500
1500
Max.
11.9
2.2
1.1
8.9
47.1
278
116
30
200
–
1.1
128 ×
t
OSC
47.1
11.5
550
550
1650
Units
s
s
s
s
s
ms
μs
μs
μs
s
s
s
s
ms
ms
ms
ms
9
9
9
9
9
9
9
9
–
0.9
–
38.9
9.5
450
450
1350
over the operating temperature range are based on characterization data. Characteristics are production tested at 25°C only.
values are at 25°C and are given for circuit design information only.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
SENSITRON [ SENSITRON ]
