Application information

NE555 - SA555 - SE555

10/20

Figure 13.

Waveforms in monostable operation

Figure 14.

Pulse duration versus R1C1

4.2

Astable operation

When the circuit is connected as shown in Figure 15 (pin 2 and 6 connected) it triggers itself

of these two resistors.

As in the triggered mode, the charge and discharge times and, therefore, frequency are

independent of the supply voltage.

CAPACITOR VOLTAGE = 2.0V/div

t = 0.1 ms / div

INPUT = 2.0V/div

OUTPUT VOLTAGE = 5.0V/div

R1 = 9.1k

Ω, C1 = 0.01μF, R = 1kΩ

L

C

(

μF)

10

1.0

0.1

0.01

0.001

10

100

1.0

10

100

10

(t )

d

μs

μs

ms

ms

ms

s