KA555 Fairchild Semiconductor, KA555 Datasheet - Page 6

• Manufacturer Part Number: KA555
• Description: IC TIMER CONTROLLER SGL 8-DIP
• Manufacturer: Fairchild Semiconductor
• Type: 555 Type, Timer/Oscillator (Single)r

Specifications of KA555

• Voltage - Supply: 4.5 V ~ 16 V
• Current - Supply: 7.5mA
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Frequency: 100kHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Count: -

KA555
KA555
An astable timer operation is achieved by adding resistor R
operation, the trigger terminal and the threshold terminal are connected so that a self-trigger is formed, operating as a multi
vibrator. When the timer output is high, its internal discharging Tr. turns off and the V
function with the time constant (R
When the V
resetting the F/F and causing the timer output to become low. This in turn turns on the discharging Tr. and the C1 discharges
through the discharging channel formed by R
output on the trigger terminal becomes high and the timer output becomes high again. The discharging Tr. turns off and the
V
In the above process, the section where the timer output is high is the time it takes for the V
and the section where the timer output is low is the time it takes for the V
is high, the equivalent circuit for charging capacitor C1 is as follows
Since the duration of the timer output high state(t
6 6 6 6
KA555
KA555
C1
Vcc
V
rises again.
C
C1
1
V
dv
C1
0+
dt
C1
C1
t
, or the threshold voltage, reaches 2Vcc/3, the comparator output on the trigger terminal becomes high,
=
=
=
V
V CC V 0-
V
CC
R
CC
R A
A
–
3
+
1
R B
–
2
3
e
–
2
R
Figure 7. Waveforms of Astable Operation
Figure 7. Waveforms of Astable Operation
Figure 7. Waveforms of Astable Operation
Figure 7. Waveforms of Astable Operation
B
-
A
R A
+R
1
B
+
C1
)*C.
t
R B
B
C1
and the discharging Tr. When the V
Vc1(0-)=Vcc/3
H
) is the amount of time it takes for the V
3
B
to Figure 1 and configuring as shown on Figure 5. In the astable
C1
to drop from 2Vcc/3 to Vcc/3. When timer output
C1
C1
falls below Vcc/3, the comparator
increases by exponential
C1
C1
(t) to reach 2Vcc/3,
to rise from Vcc/3 to 2Vcc/3,