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参数资料
| 型号： | LM555C |
| 厂商： | Harris Corporation |
| 英文描述： | Timers for Timing Delays and Oscillator Application in Commercial, Industrial and Military Equipment |
| 中文描述： | 计时器的时间延误和商业，工业和军事振荡器应用设备 |
| 文件页数： | 3/6页 |
| 文件大小： | 79K |
| 代理商： | LM555C |
8-5
Schematic Diagram
Typical Applications
Reset Timer (Monostable Operation)
Figure 1 shows the CA555 connected as a reset timer. In this
mode of operation capacitor CT is initially held discharged by
a transistor on the integrated circuit. Upon closing the “start”
switch, or applying a negative trigger pulse to terminal 2, the
integral timer ip-op is “set” and releases the short circuit
across CT which drives the output voltage “high” (relay ener-
gized). The action allows the voltage across the capacitor to
increase exponentially with the constant t = R1CT. When the
voltage across the capacitor equals 2/3 V+, the comparator
resets the ip-op which in turn discharges the capacitor rap-
idly and drives the output to its low state.
Output Rise Time
tR
-
100
-
100
-
ns
Output Fall Time
tF
-
100
-
100
-
ns
NOTES:
2. When the output is in a high state, the DC supply current is typically 1mA less than the low state value.
3. The threshold current will determine the sum of the values of R1 and R2 to be used in Figure 4 (astable operation); the maximum total
R1 + R2 = 20M.
Electrical Specications
TA = 25
oC, V+ = 5V to 15V Unless Otherwise Specied (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
CA555, LM555
CA555C, LM555C, NE555
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
6
THRESHOLD
7
RESET
DISCHARGE
V-
RESET
DISCHARGE
3
OUTPUT
FLIP-FLOP
TRIGGER
COMPARATOR
THRESHOLD
COMPARATOR
4.7K
830
4.7K
D2
D1
Q3
Q4
Q7
Q5
Q2
Q1
10K
Q8
Q6
100
100K
Q9
Q11 Q12
1K
Q10
5K
Q13
Q16
7K
D3
Q14
Q15
Q17
3.9K
Q19
Q20
Q21
Q18
8
V+
CONTROL
VOLTAGE
5K
6.8K
5K
4.7K
220
4.7K
5
2
4
1
TRIGGER
D4
NOTE: Resistance values are in ohms.
CA555, CA555C, LM555, LM555C, NE555
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM555CE | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| LM555CIM | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| LM555CIN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| LM555CJ/A+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| LM555CM | 功能描述:计时器和支持产品 Single Timer RoHS:否 制造商:Micrel 类型:Standard 封装 / 箱体:SOT-23 内部定时器数量:1 电源电压-最大:18 V 电源电压-最小:2.7 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
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