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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)： | 6/14頁 |
| 文件大?。?/td> | 148K |
| 代理商： | KA555 |
KA555
6
An astable timer operation is achieved by adding resistor R
B
to Figure 1 and configuring as shown on Figure 5. In astable
operation, the trigger terminal and the threshold terminal are connected so that a self-trigger is formed, operating as a multi
vibrator. When the timer output is high, its internal discharging Tr. turns off and the V
C1
increases by exponential
function with the time constant (R
A
+R
B
)*C.
When the V
C1
, or the threshold voltage, reaches 2Vcc/3, the comparator output on the trigger terminal becomes high,
resetting the F/F and causing the timer output to become low. This in turn turns on the discharging Tr. and the C1 discharges
through the discharging channel formed by R
B
and the discharging Tr. When the V
C1
falls below Vcc/3, the comparator
output on the trigger terminal becomes high and the timer output becomes high again. The discharging Tr. turns off and the
V
C1
rises again.
In the above process, the section where the timer output is high is the time it takes for the V
C1
to rise from Vcc/3 to 2Vcc/3,
and the section where the timer output is low is the time it takes for the V
C1
to drop from 2Vcc/3 to Vcc/3. When timer output
is high, the equivalent circuit for charging capacitor C1 is as follows
:
Since the duration of the timer output high state(t
H
) is the amount of time it takes for the V
C1
(t) to reach 2Vcc/3,
Figure 7. Waveforms of Astable Operation
Vcc
R
A
R
B
C1
Vc1(0-)=Vcc/3
C1
RA
=
RB
)
+
=
1
( )
VC10+
(
)
VCC3
2
( )
VC1t
( )
VCC1
2
3
e
-
)
C1
(
–
–
=
3
( )
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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