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74HC423

Dual retriggerable monostable multivibrator with reset

The 74HC423 is a dual retriggerable monostable multivibrator with output pulse width control by two 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 (nA) or (nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made as long as desired. When nRD is LOW, it forces the nQ output LOW, the nQ output HIGH and also inhibits the triggering. Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower input rise and fall times. The '423' is identical to the '123' but cannot be triggered via the reset input. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

Features and benefits

  • 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

  • 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 standard no. 7A

  • CMOS input level

  • ESD protection:

    • HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V

    • CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V

  • Specified from -40 °C to +85 °C and from -40 °C to +125 °C

Parametrics

Type numberProduct statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Rth(j-c) (K/W)Package name
74HC423BQProduction2.0 - 6.0CMOS± 5.223low-40~125804.347DHVQFN16
74HC423DProduction2.0 - 6.0CMOS± 5.223low-40~125772.835SO16

Package

Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC423BQ
DHVQFN16
(SOT763-1) 		SOT763-1SOT763-1_115ActiveHC42374HC423BQ,115
( 9352 854 28115 )
74HC423D
SO16
(SOT109-1) 		SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
SOT109-1_653Active74HC423D74HC423D,653
( 9337 148 70653 )

The variants in the table below are discontinued. See the table Discontinuation information for more information.

Type numberPackagePackage informationReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC423D
SO16
(SOT109-1) 		SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
SOT109-1_652Withdrawn / End-of-life74HC423D74HC423D,652
( 9337 148 70652 )

Discontinuation information

Type numberOrderable part number, (Ordering code (12NC))Last time buy dateLast time delivery dateReplacement productStatusComments
74HC423D9337148706522021-12-312022-06-3074HC423D

    Environmental information

    Type numberOrderable part numberChemical contentRoHSRHF-indicatorLeadfree conversion date
    74HC423BQ74HC423BQ,11574HC423BQAlways Pb-free
    74HC423D74HC423D,65374HC423Dweek 6, 2004

    The variants in the table below are discontinued. See the table Discontinuation information for more information.

    Type numberOrderable part numberChemical contentRoHSRHF-indicatorLeadfree conversion date
    74HC423D74HC423D,65274HC423Dweek 6, 2004
    Quality and reliability disclaimer

    Documentation (9)

    File nameTitleTypeDate
    74HC423Dual retriggerable monostable multivibrator with resetData sheet2024-03-13
    AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
    Nexperia_Selection_guide_2023Nexperia Selection Guide 2023Selection guide2023-05-10
    HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
    SOT763-1plastic, leadless dual in-line compatible thermal enhanced very thin quad flat package; 16 terminals; 0.5 mm pitch; 3.5 mm x 2.5 mm x 1 mm bodyPackage information2023-05-11
    SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08
    SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
    WAVE_BG-BD-1Wave soldering profileWave soldering2021-09-08
    SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.75 mm bodyPackage information2023-11-07

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