LM555QML

SNOSAP2C – AUGUST 2005 – REVISED APRIL 2013

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Figure 15 is a nomograph for easy determination of R, C values for various time delays.

NOTE

In monostable operation, the trigger should be driven high before the end of timing cycle.

Figure 15. Time Delay

ASTABLE OPERATION

If the circuit is connected as shown in Figure 16 (pins 2 and 6 connected) it will trigger itself and free run as a

may be precisely set by the ratio of these two resistors.

Figure 16. Astable

triggered mode, the charge and discharge times, and therefore the frequency are independent of the supply

voltage.

Figure 17 shows the waveforms generated in this mode of operation.

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