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

  • 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
  • Complies with JEDEC standard no. 7A
  • Input levels:
    • For 74HC423: CMOS level
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 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 numberPackageOutline versionReflow-/Wave solderingPackingStatusMarkingOrderable part number, (Ordering code (12NC))
74HC423BQ
DHVQFN16
(SOT763-1)
SOT763-1Reel 7" Q1/T1ActiveHC42374HC423BQ,115
( 9352 854 28115 )
74HC423D
SO16
(SOT109-1)
SOT109-1SO-SOJ-REFLOW
SO-SOJ-WAVE
Reel 13" Q1/T1 CECCActive74HC423D74HC423D,653
( 9337 148 70653 )
Bulk Pack, CECCActive74HC423D74HC423D,652
( 9337 148 70652 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFRMTBF (hour)MSLMSL leadfree
74HC423BQ74HC423BQ,11574HC423BQAlways Pb-free84.96.621.51E811
74HC423D74HC423D,65374HC423Dweek 6, 200484.96.621.51E811
74HC423D74HC423D,65274HC423Dweek 6, 200484.96.621.51E811
Quality and reliability disclaimer

Documentation (11)

File nameTitleTypeDate
74HC423Dual retriggerable monostable multivibrator with resetData sheet2017-03-16
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
nexperia_selection_guide_2019_201901Selection guide 2019. Discretes, Logic and MOSFETsSelection guide2018-12-12
HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
SOT763-1_115DHVQFN16; Reel pack, SMD, 7" Q1/T1 standard product orientation Orderable part number ending ,115 or X Ordering code (12NC) ending 115Packing2016-07-05
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 bodyOutline drawing2018-11-14
SOT109-1_431SO16; Reel sulfur barrier pack, SMD, 13" Q1/T1 standard product orientation Orderable part number ending ,431 or Z Ordering code (12NC) ending 431Packing2016-08-25
SOT109-1_118SO16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packing2013-04-24
SOT109-1plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.35 mm bodyOutline drawing2018-10-18
SO-SOJ-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SO-SOJ-WAVEFootprint for wave solderingWave soldering2009-10-08

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