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LM555 データシート(PDF) 4 Page - Fairchild Semiconductor

部品番号 LM555
部品情報  Single Timer
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メーカー  FAIRCHILD [Fairchild Semiconductor]
ホームページ  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

LM555 データシート(HTML) 4 Page - Fairchild Semiconductor

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LM555
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 voltage or
the trigger voltage. Only when the high signal is applied to the reset terminal, the timer's output changes according 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 discharge Tr.
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 voltage, the timer's internal
discharge Tr. turns off, increasing the threshold voltage and driving the timer output again at high.
1. Monostable Operation
Table 1. Basic Operating Table
Threshold Voltage
(Vth)(PIN 6)
Trigger Voltage
(Vtr)(PIN 2)
Reset(PIN 4)
Output(PIN 3)
Discharging Tr.
(PIN 7)
Don't care
Don't care
Low
Low
ON
Vth > 2Vcc / 3
Vth > 2Vcc / 3
High
Low
ON
Vcc / 3 < Vth < 2 Vcc / 3
Vcc / 3 < Vth < 2 Vcc / 3
High
-
-
Vth < Vcc / 3
Vth < Vcc / 3
High
High
OFF
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
Time Delay(s)
Figure 1. Monostable Circuit
Figure 2. Resistance and Capacitance vs.
Time delay(td)
Figure 3. Waveforms of Monostable Operation
1
5
6
7
8
4
2
3
RESET
Vcc
DISCH
THRES
CONT
GND
OUT
TRIG
+Vcc
RA
C1
C2
RL
Trigger


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