74HC123 Dual Retriggerable Monostable Multivibrator IC (SMD Package)

A monostable multivibrator, or one-shot, generates a single pulse of a fixed duration the moment it's triggered and then sits idle until triggered again, useful for debouncing a mechanical switch, generating a fixed-width timing pulse, or stretching a brief signal out long enough for other logic to notice it. The 74HC123 carries two of these independent one-shots on one chip, with retriggerable behavior that extends the output pulse if another trigger arrives before the current one finishes, rather than cutting it short.