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參數(shù)資料
| 型號： | CA0555M96 |
| 廠商： | Harris Corporation |
| 英文描述： | Timers for Timing Delays and Oscillator Application in Commercial, Industrial and Military Equipment |
| 中文描述： | 計時器的時間延誤和商業(yè)，工業(yè)和軍事振蕩器應(yīng)用設(shè)備 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大小： | 84K |
| 代理商： | CA0555M96 |
4
Figure 2 shows the typical waveforms generated during this
mode of operation, and Figure 3 gives the family of time
delay curves with variations in R
1
and C
T
.
Repeat Cycle Timer (Astable Operation)
Figure 4 shows the CA555 connected as a repeat cycle
timer. In this mode of operation, the total period is a function
of both R
1
and R
2.
T = 0.693 (R
1
+ 2R
2
) C
T
= t
1
+ t
2
where t
1
= 0.693 (R
1
+ R
2
) C
T
and t
2
= 0.693 (R
2
) C
T
the duty cycle is:
Typical waveforms generated during this mode of operation
are shown in Figure 5. Figure 6 gives the family of curves of
free running frequency with variations in the value of
(R
1
+ 2R
2
) and C
T
.
t
D
3V
3.3V
CAPACITOR
5V
0
0
0
SWITCH S
1
“OPEN”
SWITCH S
1
“CLOSED”
INPUT
VOLTAGE (TERMINAL 2)
VOLTAGE (TERMINALS 6, 7)
OUTPUT
VOLTAGE
(TERMINAL 3)
FIGURE 2. TYPICAL WAVEFORMS FOR RESET TIMER
TIME DELAY(s)
10
1
10
-1
0.1
0.01
0.001
T
A
= 25
o
C
V+ = 5V
R
1
= 1k
10k
C
μ
F
1
10
100
100k
1M
10M
10
-2
10
-3
10
-4
10
-5
FIGURE 3. TIME DELAY vs RESISTANCE AND CAPACITANCE
1
CA555
EO
8
5
2
6
7
3
4
R
1
C
T
0.01
μ
F
RELAY
COIL
R
2
V+
5V
FIGURE 4. REPEAT CYCLE TIMER (ASTABLE OPERATION)
t
1
t
2
-----+
=
R
1
R
2
2
+
---------+
CA555, CA555C, LM555C
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