Datasheet > LM555CMX_12

LM555CMX_12

更新时间： 2022-03-18 06:57:56

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		/
页数	文件大小	规格书
13页	194K
描述
Single Timer

阅读下载

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

LM555CMX_12 数据手册

LM555



^







------------------------------------

- –





R + R C1







t =

= V

1 –

4





= C R + R In2 = 0.693R + R C

5

The equivalent circuit for discharging capacitor C1, when timer output is low is, as follows:

R_B

V_C1(0-)=2Vcc/3

R_D

+ R

-------------- ----------------------

= 0

6

7

------------------------------------

R + R C1

t =

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

------------------------------------

R + R C1

8

= C R + R In2 = 0.693R + R C

9

Since R is normally R >>R although related to the size of discharging Tr.,

t_L=0.693R C

(10)

B 1

Consequently, if the timer operates in astable, the period is the same with

'T=t +t =0.693(RA+R )C +0.693R C =0.693(R +2R )C ' because the period is the sum of the charge time and discharge

B 1

time. And since frequency is the reciprocal of the period, the following applies.

1.44

---

---------------------------------------

frequency,

f =

11

R + 2R C

3. Frequency divider

By adjusting the length of the timing cycle, the basic circuit of Figure 1 can be made to operate as a frequency divider. Figure

8. illustrates a divide-by-three circuit that makes use of the fact that retriggering cannot occur during the timing cycle.

1...4 5 678 9 10...13

下载PDF

与LM555CMX_12相关器件

型号	品牌	描述	获取价格	数据表
LM555CN	HARRIS	Timers for Timing Delays and Oscillator Application in Commercial, Industrial and Military	获取价格
LM555CN	ONSEMI	单计时器	获取价格
LM555CN	TI	Timing from Microseconds through Hours	获取价格
LM555CN	NSC	Timer	获取价格
LM555CN	FAIRCHILD	Single Timer	获取价格
LM555CN	INTERSIL	Timers for Timing Delays and Oscillator Applications in Commercial, Industrial and Militar	获取价格