KA555D Fairchild Semiconductor, KA555D Datasheet - Page 4

• Manufacturer Part Number: KA555D
• Description: IC TIMER CONTROLLER SGL 8-SOP
• Manufacturer: Fairchild Semiconductor
• Type: 555 Type, Timer/Oscillator (Single)r

Specifications of KA555D

• Voltage - Supply: 4.5 V ~ 16 V
• Current - Supply: 7.5mA
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-SOIC (3.9mm Width)
• Frequency: 100kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Count: -

KA555
KA555
KA555
KA555
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
4 4 4 4
Vcc / 3 < V
Threshold Voltage
Threshold Voltage
Threshold Voltage
Threshold Voltage
Trigger
Figure 3. Waveforms of Monostable Operation
Figure 3. Waveforms of Monostable Operation
Figure 3. Waveforms of Monostable Operation
Figure 3. Waveforms of Monostable Operation
V
V
th
(V (V (V (V
Don't care
th
R
L
th th th th
> 2Vcc / 3
Figure 1. Monoatable Circuit
Figure 1. Monoatable Circuit
Figure 1. Monoatable Circuit
Figure 1. Monoatable Circuit
< Vcc / 3
)(Pin6)
)(Pin6)
)(Pin6)
)(Pin6)
th
< 2 Vcc / 3
3
2
OUT
TRIG
RESET
4
GND
1
Vcc / 3 < V
Trigger Voltage
Trigger Voltage
Trigger Voltage
Trigger Voltage
THRES
V
Vcc
DISCH
V
CONT
8
th
(V (V (V (V
Don't care
th
> 2Vcc / 3
tr tr tr tr
< Vcc / 3
)(Pin2)
)(Pin2)
)(Pin2)
)(Pin2)
th
7
6
5
Table 1. Basic Operating Table
Table 1. Basic Operating Table
Table 1. Basic Operating Table
Table 1. Basic Operating Table
< 2 Vcc / 3
C2
+Vcc
R
C1
A
Reset(Pin4)
Reset(Pin4)
Reset(Pin4)
Reset(Pin4)
High
High
High
Low
Figure 2. Resistance and Capacitance vs.
Figure 2. Resistance and Capacitance vs.
Figure 2. Resistance and Capacitance vs.
Figure 2. Resistance and Capacitance vs.
10 10 10 10
10 10 10 10
10 10 10 10
10 10 10 10
10 10 10 10
10 10 10 10
-1 -1 -1 -1
-2 -2 -2 -2
-3 -3 -3 -3
2 2 2 2
1 1 1 1
0 0 0 0
10 10 10 10
-5 -5 -5 -5
Time delay(t
Time delay(t
Time delay(t
Time delay(t
10 10 10 10
-4 -4 -4 -4
Output(Pin3)
Output(Pin3)
Output(Pin3)
Output(Pin3)
10 10 10 10
-3 -3 -3 -3
High
Low
Low
-
Time Delay(s)
Time Delay(s)
Time Delay(s)
Time Delay(s)
10 10 10 10
d d d d
-2 -2 -2 -2
) ) ) )
10 10 10 10
-1 -1 -1 -1
10 10 10 10
Discharging Tr.
Discharging Tr.
Discharging Tr.
Discharging Tr.
0 0 0 0
(Pin7)
(Pin7)
(Pin7)
(Pin7)
10 10 10 10
OFF
ON
ON
1 1 1 1
-
10 10 10 10
2 2 2 2