74HC423BQ

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.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74HC423BQ 74HC423BQ,115 935285428115 SOT763-1 Order product

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

Target applications

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

Package

Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackageOutline versionReflow-/Wave solderingPacking
74HC423BQ74HC423BQ,115
( 9352 854 28115 )
ActiveHC423
DHVQFN16
(SOT763-1)
SOT763-1Reel 7" Q1/T1

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFEFRIFRMTBF (hour)MSLMSL leadfree
74HC423BQ74HC423BQ,11574HC423BQ84.96.621.51E811
Quality and reliability disclaimer

Documentation (5)

File nameTitleTypeDate
74HC423Dual retriggerable monostable multivibrator with resetData sheet2017-03-16
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
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

Support

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Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
74HC423BQ74HC423BQ,115935285428115Reel 7" Q1/T1Order product

Sample

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