RE46C140
CMOS Photoelectric Smoke Detector ASIC with Interconnect R&E International
and Timer Mode A Subsidiary of Microchip Technology Inc.
Product Specification
2009 © Microchip Technology Inc. DS22179B-page 4
AC Electrical Characteristics at TA =-25° to 75°, VDD=9V, VSS=0V, Component Values from Figure 2 ;
R9=100KΩ, R12=10MΩ, C5= 1.5nF(unless otherwise noted)
Limits
Parameter Symbol
Test
Pin Test Conditions
Min Typ Max Units
Oscillator Period
T
POSC
12 No Alarm Condition 9.4 10.5 11.5 mS
LED and STROBE On Time
T
ON1
11,4 Operating 9.4 10.5 11.5 mS
T
PLED1
11 Standby, No Alarm 39 43 47 S
T
PLED2
11 Local Alarm Condition .45 .5 .55 S
T
PLED3
11 Timer Mode, No Local Alarm 9.6 10.75 11.8 S
LED Period
T
PLED4
11 Remote Alarm Only
LED IS NOT ON
S
T
PER1
4,6 Standby, No Alarm 9.6 10.75 11.8 S
T
PER1A
4,6
Standby, After 1 Valid Smoke
Sample
1.8 2 2.2 S
T
PER1B
4,6
Standby, After 2 Consecutive Valid
Smoke Samples
.9 1 1.1 S
T
PER2
4,6
In Local Alarm – (3 Consecutive
Valid Smoke Samples)
.9 1 1.1 S
T
PER3
4,6 In Remote Alarm 7.2 8 8.9 S
T
PER4
4,6 Pushbutton Test 300 336 370 mS
STROBE and IRED Pulse
Period
T
PER5
4,6
Chamber Test or Low Battery
Test, no Alarms
38.9 47.1 S
IRED On Time
T
ON2
6 Operating 94 104 115 uS
T
HON1
8,9 Operating, Alarm Condition, Note 1 450 500 550 mS
Horn On Time
T
HON2
8,9
Low Battery or Failed Chamber
Test , No Alarm
9.5 10.5 11.5 mS
T
HOF1
8,9 Operating, Alarm Condition, Note 1 450 500 550 mS
T
HOF2
8,9 Operating, Alarm Condition, Note 1 1.35 1.5 1.65 S
Horn Off Time
T
HOF3
8,9
Low Battery or Failed Chamber
Test, No Alarm
39 43 47 S
IO Charge Dump Duration
T
IODMP
7
At Conclusion of Local Alarm or
Test Alarm
.9 1.46 S
IO Delay
T
IODLY1
7
From Start of Local Alarm to IO
Active
0 S
IO Filter
T
IOFILT
7
IO pulse width guaranteed to be
filtered. IO as Input, No Local
Alarm
600 mS
Remote Alarm Delay
T
IODLY2
7
No Local Alarm, From IO Active
Horn Active
1.05 2.0 S
Timer Period
T
TPER
No Alarm Condition, Note 2 8 10 12 Min
Note 1 – See timing diagram for Horn Temporal Pattern
Note 2 – During the timer mode the LED Period is 10.5 seconds. The LED period will return to a 43 seconds at the conclusion of the timer
mode.
Note 3 - T
POSC
and T
ON2
are 100% production tested. All other timing is guaranteed by functional testing.
Typical values are for design information and are not guaranteed.
Limits over the specified temperature range are not production tested and are based on characterization data.
