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U74HC123G-S16-T Datasheet(PDF) 1 Page - Unisonic Technologies |
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U74HC123G-S16-T Datasheet(HTML) 1 Page - Unisonic Technologies |
1 / 10 page UNISONIC TECHNOLOGIES CO., LTD U74HC123 CMOS IC www.unisonic.com.tw 1 of 10 Copyright © 2013 Unisonic Technologies Co., Ltd QW-R502-A10.A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR WITH RESET DESCRIPTION The U74HC123 is high-speed Si-gate CMOS device and is pin compatible with low power Schottky TTL (LSTTL). The U74HC123 is a dual retriggerable monostable multivibrator with output pulse width control by three methods. The basic pulse time is programmed by selection of an external resistor (REXT) and capacitor (CEXT). 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, SOP-16 TSSOP-16 the output pulse period (nQ=HIGH, n Q =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 D nR , which also inhibits the triggering. An internal connection from D nR to the input gates makes it possible to trigger the circuit by a positive-going signal at input D nR as shown in the function table. The basic output pulse width is essentially determined by the values of the external timing components REXT and CEXT. Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower input rise and fall times. FEATURES * DC triggered from active HIGH or active LOW inputs * Retriggerable for very long pulses up to 100% duty factor * Direct reset terminates output pulse * Schmitt-trigger action on all inputs except for the reset input ORDERING INFORMATION Ordering Number Package Packing Lead Free Halogen Free U74HC123L-S16-R U74HC123G-S16-R SOP-16 Tape Reel U74HC123L-S16-T U74HC123G-S16-T SOP-16 Tube U74HC123L-P16-R U74HC123G-P16-R TSSOP-16 Tape Reel U74HC123L-P16-T U74HC123G-P16-T TSSOP-16 Tube |
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