MC146012 데이터 시트보기 (PDF) - Freescale Semiconductor
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MC146012 Datasheet PDF : 18 Pages
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Table 3. AC Electrical Characteristics (Refer to Timing Diagram Figure 3 and Figure 4. TA = 25°C, VDD = 9.0 V,
Component Values from Figure 5.) (continued)
No. Symbol
Parameter
Test Condition
Clocks Min(1)
Typ(2)
Max(1)
Unit
13
tON Silver and Brass Temporal
14
tOFF
Modulation Pulse Width
64
0.45
0.5
64
0.45
0.5
15
tOFFD
192
1.35
1.52
16
tCH Silver and Brass Chirp Pulse
Low Supply or Degraded
4096 28.8
32.4
Period
Chamber Sensitivity
0.55
s
0.55
1.65
35.2
s
17 tW(CH) Silver and Brass Chirp Pulse
Width
18
tRR Rising Edge on I/O to Smoke
Alarm Response Time
Low Supply or Degraded
1.0
7.2
Chamber Sensitivity
Remote Smoke, No local
—
—
smoke
8.0
2.0(3)
8.8
ms
—
s
19
tstb Strobe Out Pulse Period
20
Smoke Test
1024 7.2
8.1
Chamber Sensitivity Test
4096 28.8
32.4
Without Local Smoke
8.8
s
35.2
s
21
Low Supply Test Without Local 4096 28.8
32.4
35.2
s
Smoke
22
Pushbutton Test/Speed-Up
—
—
1.0
—
s
23
tMUTE
—
6.0
8.0
11
min
1. Oscillator period T (T = Tr + Tf) is determined by the external components R1, R2 and C3 where Tr = (0.6931)R2*C3 and Tf = (0.6931)R1*C3.
The other timing characteristics are some multiple of the oscillator timing shown in the table. The timing shown should accommodate the
NFPA72, ANSI S3.41, and ISO8201 audible emergency evacuation signals.
2. Typicals are not guaranteed.
3. Time is typical-depends on what point in cycle the signal is applied.
Sensors
Freescale Semiconductor
MC146012
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