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参数资料
| 型号： | LM555CN |
| 厂商： | INTERSIL CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | Timers for Timing Delays and Oscillator Applications in Commercial, Industrial and Military Equipment |
| 中文描述： | PULSE; RECTANGULAR, TIMER, PDIP8 |
| 封装： | PLASTIC, DIP-8 |
| 文件页数： | 4/6页 |
| 文件大小： | 84K |
| 代理商： | LM555CN |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM555CN NOPB | 制造商:National Semiconductor 功能描述:Standard Timer Single 8-Pin PDIP Rail |
| LM555CN | 制造商:Texas Instruments 功能描述:IC TIMER 555 DIP8 |
| LM555CN/A+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| LM555CN/B+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| LM555CN/NOPB | 功能描述:计时器和支持产品 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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