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KA555I Fiches technique(PDF) 4 Page - Fairchild Semiconductor

No de pièce KA555I
Description  Single Timer
Download  14 Pages
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA555I Fiches technique(HTML) 4 Page - Fairchild Semiconductor

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KA555
KA555
KA555
KA555
4
4
4
4
Application Information
Application Information
Application Information
Application Information
Table1 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
1. MonoStable Operation
1. MonoStable Operation
1. MonoStable Operation
Table 1. Basic Operating Table
Table 1. Basic Operating Table
Table 1. Basic Operating Table
Table 1. Basic Operating Table
Threshold Voltage
Threshold Voltage
Threshold Voltage
Threshold Voltage
(V
(V
(V
(Vth
th
th
th)(Pin6)
)(Pin6)
)(Pin6)
)(Pin6)
Trigger Voltage
Trigger Voltage
Trigger Voltage
Trigger Voltage
(V
(V
(V
(Vtr
tr
tr
tr)(Pin2)
)(Pin2)
)(Pin2)
)(Pin2)
Reset(Pin4)
Reset(Pin4)
Reset(Pin4)
Reset(Pin4)
Output(Pin3)
Output(Pin3)
Output(Pin3)
Output(Pin3)
Discharging Tr.
Discharging Tr.
Discharging Tr.
Discharging Tr.
(Pin7)
(Pin7)
(Pin7)
(Pin7)
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
10
10
10
-5
-5
-5
-5
10
10
10
10
-4
-4
-4
-4
10
10
10
10
-3
-3
-3
-3
10
10
10
10
-2
-2
-2
-2
10
10
10
10
-1
-1
-1
-1
10
10
10
10
0
00
0
10
10
10
10
1
11
1
10
10
10
10
2
22
2
10
10
10
10
-3
-3
-3
-3
10
10
10
10
-2
-2
-2
-2
10
10
10
10
-1
-1
-1
-1
10
10
10
10
0
00
0
10
10
10
10
1
11
1
10
10
10
10
2
22
2
Time Delay(s)
Time Delay(s)
Time Delay(s)
Time Delay(s)
Figure 1. Monoatable Circuit
Figure 1. Monoatable Circuit
Figure 1. Monoatable Circuit
Figure 1. Monoatable Circuit
Figure 2. Resistance and Capacitance vs.
Figure 2. Resistance and Capacitance vs.
Figure 2. Resistance and Capacitance vs.
Figure 2. Resistance and Capacitance vs.
Time delay(t
Time delay(t
Time delay(t
Time delay(td
d
d
d))))
Figure 3. Waveforms of Monostable Operation
Figure 3. Waveforms of Monostable Operation
Figure 3. Waveforms of Monostable Operation
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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