74AHC123APW

Dual retriggerable monostable multivibrator with reset

The 74AHC123A; 74AHCT123A are high-speed Si-gate CMOS devices and are pin compatible with Low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

The 74AHC123A; 74AHCT123A are dual retriggerable monostable multivibrators 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, 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, which also inhibits the triggering.

An internal connection from nRD to the input gate makes it possible to trigger the circuit by a positive-going signal at input nRD. The basic output pulse width is essentially determined by the value of the external timing components REXT and CEXT. When CEXT ≥ 10 nF, the typical output pulse width is defined as: tW= REXT× CEXT where tW= pulse width in ns; REXT= external resistor in kΩ; CEXT= external capacitor in pF. Schmitt-trigger action at all inputs makes the circuit highly tolerant to slower input rise and fall times.

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
74AHC123APW 74AHC123APW,118 935265564118 SOT403-1 Order product
74AHC123APW 74AHC123APW,112 935265564112 SOT403-1 Order product

Features

  • All inputs have a Schmitt-trigger action
  • Inputs accept voltages higher than VCC
  • DC triggered from active HIGH or active LOW inputs
  • Retriggerable for very long pulses up to 100 % duty factor
  • Direct reset terminates output pulse
  • For 74AHC123A only: operates with CMOS input levels
  • For 74AHCT123A only: operates with TTL input levels
  • ESD protection:
    • HBM JESD22-A114E exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
    • CDM JESD22-C101C exceeds 1000 V
  • Multiple package options
  • 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
74AHC123APWProduction2.0 - 5.5CMOS± 85.1low-40~1251264.855.7TSSOP16

Package

Type numberOrderable part number, (Ordering code (12NC))StatusMarkingPackageOutline versionReflow-/Wave solderingPacking
74AHC123APW74AHC123APW,118
( 9352 655 64118 )
ActiveAHC123A
TSSOP16
(SOT403-1)
SOT403-1SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1
74AHC123APW,112
( 9352 655 64112 )
ActiveAHC123ABulk Pack

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFEFRIFRMTBF (hour)MSLMSL leadfree
74AHC123APW74AHC123APW,11874AHC123APW84.96.621.51E811
74AHC123APW74AHC123APW,11274AHC123APW84.96.621.51E811
Quality and reliability disclaimer

Documentation (6)

File nameTitleTypeDate
74AHC_AHCT123ADual retriggerable monostable multivibrator with resetData sheet2017-05-04
AN11106Pin FMEA for AHC/AHCT familyApplication note2019-01-09
ahc123aahc123a IBIS modelIBIS model2013-04-08
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
SOT403-1_118TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packing2013-04-08
SOT403-1plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.1 mm bodyOutline drawing2018-11-14

Support

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Models

File nameTitleTypeDate
ahc123aahc123a IBIS modelIBIS model2013-04-08

Ordering, pricing & availability

Type numberOrderable part numberOrdering code (12NC)PackingBuy online
74AHC123APW74AHC123APW,118935265564118Reel 13" Q1/T1Order product
74AHC123APW74AHC123APW,112935265564112Bulk PackOrder product

Sample

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