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參數(shù)資料
| 型號： | NE555N |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC MONO TIMING 8-DIP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | 555 型，計(jì)時(shí)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-DIP（0.300"，7.62mm） |
| 包裝： | 管件 |
| 供應(yīng)商設(shè)備封裝： | 8-DIP |
| 安裝類型： | 通孔 |
| 其它名稱： | NE555NFS |
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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