74HC123PW,118

NXP  74HC123PW,118  芯片, 多谐振荡器, 单稳态, TSSOP-16

The 74HC123PW is a dual retriggerable Monostable Multivibrator with a reset. It is pin compatible with low-power Schottky TTL LSTTL. It comes with an output pulse width control. The Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower input rise and fall times. The output pulse is controlled by three methods, first - the basic pulse is programmed by selection of an external resistor REXT and capacitor CEXT. 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. Alternatively an output delay can be terminated at any time by a low-going edge on input nRD\, which also inhibits the triggering. Third - an internal connection from nRD to the input gates makes it possible to trigger.

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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 pulse

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

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Complies with JEDEC standard No. 7A