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參數(shù)資料
| 型號(hào)： | SA555D |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 定時(shí)器 |
| 英文描述： | GENERAL PURPOSE SINGLE BIPOLAR TIMERS |
| 中文描述： | 一般用途的單雙極型定時(shí)器 |
| 文件頁(yè)數(shù)： | 8/10頁(yè) |
| 文件大小： | 110K |
| 代理商： | SA555D |
LINEARRAMP
When the pullupresistor,R
A
, in the monostablecir-
cuitisreplacedbyaconstantcurrentsource,alinear
ramp is generated. Figure 17 shows a circuit con-
figuration that will perform this function.
Trigger
Output
C
NE555
2
4
3
1
5
6
7
8
E
V
CC
0.01
μ
F
R2
R1
R
2N4250
or equiv.
Figure17.
Out
R
A
51k
C
NE55
2
4
3
1
5
6
7
8
V
CC
R
B
22k
0.01
μ
F
V
CC
0.01
μ
F
Figure 19 :
50%Duty Cycle Oscillator.
Figure18 showswaveformsgeneratorbythe linear
ramp.
Thetime interval is given by :
T
=(
2/3 V
CC
R
E
(
R
1
+
R
2
)
C
R
1
V
CC
V
BE
(
R
1
+
R
2
)
V
BE
=
0.6V
Figure 18 :
LinearRamp.
V
= 5V
Time = 20
μ
s/DIV
R
1
= 47k
R
2
= 100k
R
E
= 2.7k
C = 0.01
μ
F
Top trace : input 3V/DIV
Middle trace : output 5V/DIV
Bottom trace : output 5V/DIV
Bottom trace : capacitor voltage
1V/DIV
50% DUTY CYCLE OSCILLATOR
For a 50% duty cycle the resistors R
A
andR
E
may
beconnectedasinfigure19.Thetimepreriodforthe
outputhigh is the sameas previous,
t
1
= 0.693R
A
C.
For the outputlow it is t
2
=
[
(
R
A
R
B
)
(
R
A
+
R
B
)
]
CLn
Thus thefrequencyof oscillationis f
=
R
B
2R
A
2R
B
R
A
1
t
1
+
t
2
Notethatthis circuit will not oscillate if R
B
is greater
than1/2 R
A
becausethe junctionof R
A
andR
B
can-
notbring pin2 downto1/3V
CC
andtriggerthelower
comparator.
ADDITIONAL INFORMATION
Adequatepower supply bypassing is necessary to
protect associated circuitry. Minimum recom-
mendedis 0.1
μ
F in parallel with 1
μ
F electrolytic.
NE555/SA555/SE555
8/10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SA555D | 制造商:STMicroelectronics 功能描述:Timer IC 制造商:Texas Instruments 功能描述:IC SM TIMER 制造商:STMicroelectronics 功能描述:IC, BIPOLAR TIMER, 500KHZ, 16V, 8-SOIC |
| SA555DE4 | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 PRECISION 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 |
| SA555DG4 | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 PRECISION 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 |
| SA555DR | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 Precision 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 |
| SA555DRE4 | 功能描述:計(jì)時(shí)器和支持產(chǎn)品 PRECISION 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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