LM555CM

更新时间： 2024-02-02 09:08:02

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LM555CM 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.13
Is Samacsys：	N	模拟集成电路 - 其他类型：	PULSE; RECTANGULAR
JESD-30 代码：	R-PDIP-T8	JESD-609代码：	e0
功能数量：	1	端子数量：	8
最高工作温度：	125 °C	最低工作温度：	-55 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装等效代码：	DIP8,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	5/15 V	认证状态：	Not Qualified
子类别：	Analog Waveform Generation Functions	最大供电电流 (Isup)：	12 mA
最大供电电压 (Vsup)：	18 V	最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	15 V	表面贴装：	NO
技术：	BIPOLAR	温度等级：	MILITARY
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	Base Number Matches：	1

LM555/NE555/SA555

Figure 7. Waveforms of Astable Operation

An astable timer operation is achieved by adding resistor R to Figure 1 and configuring as shown on Figure 5. In the astable

operation, the trigger terminal and the threshold terminal are connected so that a self-trigger is formed, operating as a multi

vibrator. When the timer output is high, its internal discharging Tr. turns off and the V increases by exponential

function with the time constant (R +R )*C.

When the V , or the threshold voltage, reaches 2Vcc/3, the comparator output on the trigger terminal becomes high,

resetting the F/F and causing the timer output to become low. This in turn turns on the discharging Tr. and the C1 discharges

through the discharging channel formed by R and the discharging Tr. When the V falls below Vcc/3, the comparator

output on the trigger terminal becomes high and the timer output becomes high again. The discharging Tr. turns off and the

rises again.

In the above process, the section where the timer output is high is the time it takes for the V to rise from Vcc/3 to 2Vcc/3,

and the section where the timer output is low is the time it takes for the V to drop from 2Vcc/3 to Vcc/3. When timer output

is high, the equivalent circuit for charging capacitor C1 is as follows:

R_A

R_B

Vcc

Vc1(0-)=Vcc/3

– V(0-)

C ------------- = ------------------------------

(1)

(2)

R + R

(0+) = V

⁄ 3

- –------------------------------------

(R + R )C1

(t) = V

1 –

(3)

Since the duration of the timer output high state(t ) is the amount of time it takes for the V (t) to reach 2Vcc/3,

1...3 4 567 8 9...14

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