74LV123PW,118

NXP  74LV123PW,118  芯片, 多谐振荡器, 单稳态, TSSOP-16

The 74LV123PW is a dual Si-gate CMOS retriggerable Monostable Multivibrator with reset. It is pin and function compatible with the 74HC123 and 74HCT123. It uses three methods to control the output pulse width, first - The basic pulse time is programmed by the selection of an external resistor REXT and capacitor CEXT. These are normally connected. Second - once triggered, the basic output pulse width may be extended by retriggering the gated active low-going edge input nA or the active high-going edge input nB. By repeating this process, the output pulse period nQ = high, nQ = low can be made as long as desired. Third - alternatively, an output delay can be terminated at any time by a low-going edge on input nRD, which also inhibits the triggering. Schmitt-trigger action in the nA and nB inputs makes the circuit highly tolerant of slower input rise and fall times.

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DC triggered from active high or active low inputs

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Retriggerable for very long pulses up to 100% duty factor

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Direct reset terminates output pulses

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Schmitt-trigger action on all inputs except for the reset input