參數資料
| 型號： | LM555CMX |
| 廠商： | Fairchild Semiconductor |
| 文件頁數： | 8/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC MONO TIMING 8-SOP |
| 標準包裝： | 1 |
| 類型： | 555 型，計時器/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-SOIC（0.154"，3.90mm 寬） |
| 包裝： | 標準包裝 |
| 供應商設備封裝： | 8-SOIC |
| 安裝類型： | 表面貼裝 |
| 其它名稱： | LM555CMXFSDKR |
LM555
—
Single
T
imer
2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
LM555 Rev. 1.1.0
4
Application Information
Table 1 below is the basic operating table of 555 timer.
When the low signal input is applied to the reset terminal, the timer output remains low regardless of the threshold volt-
age or the trigger voltage. Only when the high signal is applied to the reset terminal, the timer's output changes accord-
ing to threshold voltage and trigger voltage.
When the threshold voltage exceeds 2/3 of the supply voltage while the timer output is high, the timer's internal dis-
charge transistor turns on, lowering the threshold voltage to below 1/3 of the supply voltage. During this time, the timer
output is maintained low. Later, if a low signal is applied to the trigger voltage so that it becomes 1/3 of the supply volt-
age, the timer's internal discharge transistor turns off, increasing the threshold voltage and driving the timer output
again at high.
1. Monostable Operation
Table 1. Basic Operating Table
Reset
(PIN 4)
VTR
(PIN 2)
VTH
(PIN 6)
Output
(PIN 3)
Discharging
Transistor
(PIN 7)
Low
X
Low
ON
High
< 1/3 VCC
XHigh
OFF
High
> 1/3 VCC
> 2/3 VCC
Low
ON
High
> 1/3 VCC
< 2/3 VCC
Previous State
Figure2. Monostable Circuit
Figure 3. Resistance and Capacitance vs.
Time Delay (tD)
Figure 4. Waveforms of Monostable Operation
1
5
6
7
8
4
2
3
RESET
Vcc
DISCH
THRES
CONT
GND
OUT
+Vcc
RA
C1
C2
RL
Trigger
10
-5
10
-4
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
M
Ω
1M
Ω
10k
Ω
100k
Ω
R A
=1k
Ω
Ca
pa
cit
a
nce(
u
F
)
Time Delay(s)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM555CMX NOPB | 制造商:Texas Instruments 功能描述:Standard Timer Single 8-Pin SOIC T/R |
| LM555CMX | 制造商:Fairchild Semiconductor Corporation 功能描述:TIMER IC ROHS COMPLIANT:NO |
| LM555CMX/260C | 制造商:Texas Instruments 功能描述: |
| LM555CMX/NOPB | 功能描述:計時器和支持產品 TIMER RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內部定時器數量: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 |
| LM555CMX/NOPB | 制造商:Texas Instruments 功能描述:IC TIMER SINGLE 16V 8-SOIC 制造商:Texas Instruments 功能描述:IC, TIMER, SINGLE, 16V, 8-SOIC |
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