Page 1130 - Basic Electrical Engineering
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terminal 6 is above V CC , the flip-flop is reset, and when the trigger input is
V CC , the flip-flop is set. The output is taken from an interface circuit driven
by the flip-flop.
17.7.4 Monostable Application of IC 555
In monostable application the external connection of the IC 555 has been
shown in Fig. 17.11.
The timer circuit will operate as a mono-shot or single-shot multivibrator.
When the trigger gets a negative pulse, the flip-flop is set, making high
turning off the discharge transistor (see Fig. 17.10), which would then allow
the discharge capacitor C (as in 15.12) to be charged up towards V . When
CC
the capacitor voltage reaches V , the threshold signal causes the flip-flop
CC
to be reset, discharging the capacitor again. The voltage waveforms of
monostable operation have been shown in Fig. 17.11 (b).
