74HC123D,653

74HC123 74HCT123 Dual retriggerable monostable multivibrator with reset Rev. 12 11 August 2021 Product data sheet 1. General description The 74HC123 74HCT123 is a dual retriggerable monostable multivibrator with reset. The basic output pulse width is programmed by selection of external components (R and C ). Once EXT EXT triggered this basic pulse width may be extended by retriggering either of the edge triggered inputs (nA or 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. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of V . CC Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower input rise and fall times. 2. Features and benefits Wide supply voltage range from 2.0 V to 6.0 V CMOS low power dissipation High noise immunity Latch-up performance exceeds 100 mA per JESD 78 Class II Level B Complies with JEDEC standards: JESD8C (2.7 V to 3.6 V) JESD7A (2.0 V to 6.0 V) Input levels: For 74HC123: CMOS level For 74HCT123: TTL level 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 ESD protection: HBM JESD22-A114F exceeds 2000 V MM JESD22-A115-A exceeds 200 V Multiple package options Specified from -40 C to +85 C and from -40 C to +125 CNexperia 74HC123 74HCT123 Dual retriggerable monostable multivibrator with reset 3. Ordering information Table 1. Ordering information Type number Package Temperature range Name Description Version 74HC123D -40 C to +125 C SO16 plastic small outline package 16 leads SOT109-1 body width 3.9 mm 74HCT123D 74HC123PW -40 C to +125 C TSSOP16 plastic thin shrink small outline package 16 leads SOT403-1 body width 4.4 mm 74HCT123PW 74HC123BQ -40 C to +125 C DHVQFN16 plastic dual in-line compatible thermal SOT763-1 enhanced very thin quad flat package no leads 16 terminals body 2.5 3.5 0.85 mm 4. Functional diagram 14 1CEXT 15 1REXT/CEXT S 13 Q 1Q 1 1A T 4 1Q Q 2 1B RD 3 1RD 6 2CEXT 7 2REXT/CEXT S 5 2Q Q 9 2A T 12 2Q Q 10 2B RD 11 2RD 001aaa610 Fig. 1. Functional diagram 74HC HCT123 All information provided in this document is subject to legal disclaimers. Nexperia B.V. 2021. All rights reserved Product data sheet Rev. 12 11 August 2021 2 / 20