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參數(shù)資料
| 型號： | LM555CMX |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC MONO TIMING 8-SOP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 555 型，計時器/振蕩器（單路） |
| 電源電壓： | 4.5 V ~ 16 V |
| 電流 - 電源： | 7.5mA |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 安裝類型： | 表面貼裝 |
| 其它名稱： | LM555CMXFSDKR |
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM555CMX NOPB | 制造商:Texas Instruments 功能描述:Standard Timer Single 8-Pin SOIC T/R |
| LM555CMX | 制造商:Fairchild Semiconductor Corporation 功能描述:TIMER IC ROHS COMPLIANT:NO |
| LM555CMX/260C | 制造商:Texas Instruments 功能描述: |
| LM555CMX/NOPB | 功能描述:計時器和支持產(chǎn)品 TIMER RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| LM555CMX/NOPB | 制造商:Texas Instruments 功能描述:IC TIMER SINGLE 16V 8-SOIC 制造商:Texas Instruments 功能描述:IC, TIMER, SINGLE, 16V, 8-SOIC |
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