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参数资料
| 型号： | LM555C |
| 厂商： | Intersil Corporation |
| 英文描述： | Timers for Timing Delays and Oscillator Applications in Commercial, Industrial and Military Equipment |
| 中文描述： | 计时器的时间延误和商业，工业和军事装备振荡器的应用 |
| 文件页数： | 3/6页 |
| 文件大小： | 84K |
| 代理商： | LM555C |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM555CE | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| LM555CIM | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| LM555CIN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| LM555CJ/A+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| LM555CM | 功能描述:计时器和支持产品 Single Timer RoHS:否 制造商:Micrel 类型:Standard 封装 / 箱体:SOT-23 内部定时器数量:1 电源电压-最大:18 V 电源电压-最小:2.7 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
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