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| 型號： | SA555S-13 |
| 廠商： | Diodes Inc |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC MONO TIMING SO8 |
| 特色產(chǎn)品： | Precision Timer ICs |
| 標準包裝： | 1 |
| 類型： | 555 型，計時器/振蕩器（單路） |
| 頻率： | 500kHz |
| 電源電壓： | 4.5 V ~ 16 V |
| 電流 - 電源： | 13mA |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 包裝： | 標準包裝 |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 安裝類型： | 表面貼裝 |
| 其它名稱： | SA555S-13DIDKR |
NE555/SA555/NA555
PRECISION TIMERS
NE555/SA555/NA555
Document number: DS35112 Rev. 4 - 2
8 of 14
February 2012
Diodes Incorporated
NEW
PROD
UC
T
Typical Applications Characteristics (cont.)
Astable Operation
As shown in Figure 4, adding a second resistor, RB, to the circuit of Figure 1 and connecting the trigger input to the threshold
input causes the timer to self-trigger and run as a multivibrator. The capacitor C charges through RA and RB and then
discharges through RB. Therefore, the duty cycle is controlled by the values of RA and RB.
This astable connection results in capacitor C charging and discharging between the threshold-voltage level (
0.67VCC) and
the trigger-voltage level (
0.33VCC). As in the monostable circuit, charge and discharge times (and, therefore, the frequency
and duty cycle) are independent of the supply voltage.
C
RL
RA
RB
THRES
TRIG
DISCH
RESET
CONT
VCC
GND
OUT
Output
4
7
6
2
1
3
8
5
Open
(See Note A)
VCC
(5V to 15V)
Decoupling CONT voltage to ground with a capacitor can
improve operation. This should be evaluated for individual
applications.
0.01F
Fig. 4 Circuit for Astable Operation
Fig. 5 Typical Astable Waveforms
Figure 5 shows typical waveforms generated during astable operation. The output high-level duration tH and low-level
duration tL can be calculated as follows:
tH = 0.693(RA +RB)C
tL = 0.693(RB)C
Other useful equations are:
period = tH + tL = 0.693(RA + 2RB)C
frequency = 1.44/(RA + 2RB)C
output driver duty cycle = tL/(tH + tL) = RB/(RA + 2RB)
output waveform duty cycle = tH/(tH + tL) = 1 – RB/(RA + 2RB)
low to high ratio = tL/tH = RB/(RA + RB)
Fig. 6 Free Running Frequency
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| SA556 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GENERAL PURPOSE DUAL BIPOLAR TIMERS |
| SA556D | 功能描述:計時器和支持產(chǎn)品 General Purpose Dual 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 |
| SA556DR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL PRECISION TIMERS |
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| SA556N | 功能描述:計時器和支持產(chǎn)品 General Purpose Dual 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 |
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