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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)： | 3/6頁 |
| 文件大小： | 84K |
| 代理商： | CA0555M96 |
3
Schematic Diagram
Typical Applications
Reset Timer (Monostable Operation)
Figure 1 shows the CA555 connected as a reset timer. In this
mode of operation capacitor C
T
is initially held discharged by
a transistor on the integrated circuit. Upon closing the “start”
switch, or applying a negative trigger pulse to terminal 2, the
integral timer flip-flop is “set” and releases the short circuit
across C
T
which drives the output voltage “high” (relay
energized). The action allows the voltage across the capacitor
to increase exponentially with the constant t = R
1
C
T
. When
the voltage across the capacitor equals 2/3 V+, the
comparator resets the flip-flop which in turn discharges the
capacitor rapidly and drives the output to its low state.
Since the charge rate and threshold level of the comparator
are both directly proportional to V+, the timing interval is
relatively independent of supply voltage variations. Typically,
the timing varies only 0.05% for a 1V change in V+.
Applying a negative pulse simultaneously to the reset
terminal (4) and the trigger terminal (2) during the timing
cycle discharges C
T
and causes the timing cycle to restart.
Momentarily closing only the reset switch during the timing
interval discharges C
T
, but the timing cycle does not restart.
6
THRESHOLD
7
RESET
DISCHARGE
V-
RESET
DISCHARGE
3
OUTPUT
OUTPUT
FLIP-FLOP
TRIGGER
COMPARATOR
THRESHOLD
COMPARATOR
4.7K
830
4.7K
D
2
D
1
Q
3
Q
4
Q
7
Q
5
Q
2
Q
1
10K
Q
8
Q
6
100
100K
Q
9
Q
11
Q
12
1K
Q
10
5K
Q
13
Q
16
7K
D
3
Q
14
Q
15
Q
17
3.9K
Q
19
Q
20
Q
21
Q
18
8
V+
CONTROL
VOLTAGE
5K
6.8K
5K
4.7K
220
4.7K
5
2
4
1
TRIGGER
D
4
NOTE: Resistance values are in ohms.
1
CA555
EO
8
5
2
6
7
3
4
680
RESET
R
1
C
T
4.7K
680
10K
0.01
μ
F
RELAY
COIL
1N4001
V+
5V
S
1
START
NOTE: All resistance values are in ohms.
FIGURE 1. RESET TIMER (MONOSTABLE OPERATION)
CA555, CA555C, LM555C
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