LM555QML

SNOSAP2C – AUGUST 2005 – REVISED APRIL 2013

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FREQUENCY DIVIDER

The monostable circuit of Figure 13 can be used as a frequency divider by adjusting the length of the timing

cycle. Figure 19 shows the waveforms generated in a divide by three circuit.

Top Trace: Input 4V/Div.

TIME = 20

μs/DIV.

Middle Trace: Output 2V/Div.

Bottom Trace: Capacitor 2V/Div.

C = 0.01

μF

Figure 19. Frequency Divider

PULSE WIDTH MODULATOR

When the timer is connected in the monostable mode and triggered with a continuous pulse train, the output

pulse width can be modulated by a signal applied to pin 5. Figure 20 shows the circuit, and in Figure 21 are

some waveform examples.

Figure 20. Pulse Width Modulator

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