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参数资料
| 型号： | LM555CIN |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 模拟波形发生器 |
| 英文描述： | PULSE, TIMER, PDIP8 |
| 封装： | DIP-8 |
| 文件页数： | 5/6页 |
| 文件大小： | 52K |
| 代理商： | LM555CIN |
LM555/I
SINGLE TIMER
Astable Operation
The LM555 can free run as a mulitivibrator by triggering itself; refer to Fig.2. The output can swing from VDD to GND and have
50
duty cycle square wave. Less than 1% frequency deviation can be observed, over a voltage range of 2 to 5V. f-1/1.4RC
Monostable Operation
The LM555 can be used as a one-short, i.e. monostable multivibrator. Initially, because the inside discharge transistor is on
state, external timing capacitor is held to GND potential. Upon application of a negative TRIGGER pulse pin 2, the intern
discharge transistor is off state and the voltage across the capacitor increases with time constant T = RAC and OUTPUT
goes to high state. When the voltage across the capacitor equals 2/3VCC the inner comparator is reset by THRESHOLD
input and the discharge transistor goes to on state, which in turn discharges the capacitor rapidly and drives the OUTPUT
to its low state.
LM555C
1
2
3
4
8
7
6
5
TRIGGER
OUTPUT
Ο
VCC
RESET
Ο
Ο VCC
DISCHARGE
Ο
ALTERNATE
OUTPUT
THRESHOLD
GND
VCC
/ / /
C
LM555C
1
2
3
4
8
7
6
5
/ / /
TRIGGER
OUTPUT
Ο
RESET
/ / /
C
OPTION
CAPACITOR
Fig. 2. Monostable Operation
Ο
DISCHARGE
THRESHOLD
CONTROL
VOLTAGE
RA
VCC ( 18V)
Fig. 1. Astable Operation
10K
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LM555CM NOPB | 制造商:National Semiconductor 功能描述:Standard Timer Single 8-Pin SOIC N Rail 制造商:National Semiconductor 功能描述:Standard Timer Single 8-Pin SOIC Rail |
| LM555CM | 制造商:Texas Instruments 功能描述:IC TIMER SMD SOIC8 555 |
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