参数资料
| 型号： | LM555CM |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC OSC MONO TIMING 8-SOP |
| 标准包装： | 90 |
| 类型： | 555 型，计时器/振荡器（单路） |
| 电源电压： | 4.5 V ~ 16 V |
| 电流 - 电源： | 7.5mA |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOP |
| 安装类型： | 表面贴装 |
| 产品目录页面： | 1220 (CN2011-ZH PDF) |
| 其它名称： | LM555CMFS |
LM555
—
Single
T
imer
2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
LM555 Rev. 1.1.0
7
The equivalent circuit for discharging capacitor C1, when timer output is low is, as follows:
Since the duration of the timer output low state (tL) is the amount of time it takes for the VC1(t) to reach VCC/3,
Since RD is normally RB>>RD although related to the size of discharging transistor,
tL = 0.693RBC1
(10)
Consquently, if the timer operates in astable, the period is the same with
't = tH+tL = 0.693(RA+RB)C1+0.693RBC1 = 0.693(RA+2RB)C1'
because the period is the sum of the charge time and discharge time. Since frequency is the reciprocal of the period,
the following applies:
C1
R
B
R
D
V
C1(0-)=2Vcc/3
C
1
dv
C1
dt
---------------
1
R
A
R
B
+
----------------------- V
C1
0
=
+6
()
V
C1
t
()
2
3
---V
CC
e
-
t
R
A
R
D
+
()C1
-------------------------------------
=7
()
---
+
()
-------------------------------------
=
()
+
()
+
()
=
()
frequency,
f
1
---
1.44
R
A
2R
B
+
()C
1
----------------------------------------
==
11
()
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LM555CM/HALF | 制造商:Texas Instruments 功能描述:IC TIMER SMD SOIC8 555 |
| LM555CM/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 |
| LM555CM/NOPB | 制造商:Texas Instruments 功能描述:Timer IC |
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