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參數(shù)資料
| 型號： | KA555 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | single timer |
| 中文描述： | PULSE; RECTANGULAR, TIMER, PDIP8 |
| 封裝： | DIP-8 |
| 文件頁數(shù)： | 7/14頁 |
| 文件大?。?/td> | 148K |
| 代理商： | KA555 |
KA555
7
The equivalent circuit for discharging capacitor C1 when timer output is low as follows:
Since the duration of the timer output low state(
t
L
) is the amount of time it takes for the V
C1
(t) to reach Vcc/3,
Since R
D
is normally R
B
>> R
D
although related to the size of discharging Tr.,
t
L
=0.693R
B
C
1
(10)
Consequently, if the timer operates in astable, the period is the same with
'T=t
H
+t
L
=0.693(RA+R
B
)C
1
+0.693R
B
C
1
=0.693(R
A
+2R
B
)C
1
' because the period is the sum of the charge time and discharge
time. And since frequency is the reciprocal of the period, the following applies
.
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.
VC1t
( )
2
3
VCC
V
=
CC1
2
3
e
-
)
C1
(
–
–
=
=
4
( )
tH
C1RA
RB
+
)
In2
0.693 RA
RB
+
)
C1
=
5
( )
C1
R
B
R
D
V
C1
(0-)=2Vcc/3
C1
dvC1
RA
RB
VC1
0
=
+
6
( )
VC1t
( )
2
3
V
CCe
-
)
C1
(
=
7
( )
1
3
VCC
2
3
V
CCe
)
In2
-
)
C1
(
=
8
( )
tL
C1RB
RD
+
0.693 RB
RD
+
)
C1
=
=
9
( )
frequency,
f
1
T
2RB
RA
+
(
)
C1
=
=
11
(
)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| KA558 | Tantalum Molded High Reliability Capacitor; Capacitance: 68uF; Voltage: 6.3V; Case Size: 7.3x4.3 mm; Packaging: Tape & Reel |
| KA558B | Tantalum Molded High Reliability Capacitor; Capacitance: 15uF; Voltage: 10V; Case Size: 6x3.2 mm; Packaging: Tape & Reel |
| KA558BD | Quad Timer |
| KA558D2 | Quad Timer |
| KA5H0165R | Fairchild Power Switch(FPS) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| KA555 | 制造商:Fairchild Semiconductor Corporation 功能描述:IC TIMER 555 DIP8 |
| KA555_Q | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 Single Timer RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時(shí)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 |
| KA555D | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 Single RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時(shí)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 |
| KA555D | 制造商:Fairchild Semiconductor Corporation 功能描述:IC TIMER SMD SOIC8 555 |
| KA555DTF | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 Single Timer RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時(shí)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 |
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