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74AHC123A; 74AHCT123A

Selection guide

Datasheet

74AHC123A; 74AHCT123A
(Product Specification)
18-Jan-08, 21 pages, 123 kB

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74AHC123A; 74AHCT123A - Dual retriggerable monostable multivibrator with reset

General description
Features
Products/packages
Quality/reliability/chemical content
Pricing/ordering/availability
Samples
Discontinued information
Applications
Block diagrams/pinning
Design support
Parametrics/similar products
Print/email
Disclaimers
All information hereunder is subject to the subsequent disclaimers

General description

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). The external resistor and capacitor are normally connected as shown in Figure 11.

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 as shown in Table 3. Figure 8 and Figure 9 illustrate pulse control by retriggering and early reset. 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 x CEXT where tW = pulse width in ns; REXT = external resistor in kOhm; CEXT = external capacitor in pF. Schmitt-trigger action at all inputs makes the circuit highly tolerant to slower input rise and fall times. The 74AHC123A; 74AHCT123A is identical to the 74AHC423; 74AHCT423 but can be triggered via the reset input.

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 pct 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 Cel to +85 Cel and from -40 Cel to +125 Cel

Products/packages

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarkingECCN
74AHC123ABQ74AHC123ABQ,1159352 854 24115Volume productionSOT763-1
(DHVQFN16)
Reel Pack, SMD, 7"Standard Marking
74AHC123AD74AHC123AD,1129352 655 63112Volume productionSOT109TubeStandard Marking
74AHC123AD74AHC123AD,1189352 655 63118Volume productionSOT109Reel Pack, SMD, 13"Standard Marking
74AHC123APW74AHC123APW,1129352 655 64112Volume productionSOT403-1
(TSSOP16)
TubeStandard Marking
74AHC123APW74AHC123APW,1189352 655 64118Volume productionSOT403-1
(TSSOP16)
Reel Pack, SMD, 13"Standard Marking
74AHCT123ABQ74AHCT123ABQ,1159352 854 25115Volume productionSOT763-1
(DHVQFN16)
Reel Pack, SMD, 7"Standard Marking
74AHCT123AD74AHCT123AD,1129352 655 61112Volume productionSOT109TubeStandard Marking
74AHCT123AD74AHCT123AD,1189352 655 61118Volume productionSOT109Reel Pack, SMD, 13"Standard Marking
74AHCT123APW74AHCT123APW,1129352 655 62112Volume productionSOT403-1
(TSSOP16)
TubeStandard Marking
74AHCT123APW74AHCT123APW,1189352 655 62118Volume productionSOT403-1
(TSSOP16)
Reel Pack, SMD, 13"Standard Marking

Quality/reliability/chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree Conversion dateRHFIRF (FIT)MTBF (hours)MSL
74AHC123ABQ74AHC123ABQ,11574AHC123ABQ
Always Pb-free 6,621,51E+081
74AHC123AD74AHC123AD,11274AHC123AD
week 35, 2004 6,621,51E+081
74AHC123AD74AHC123AD,11874AHC123AD
week 35, 2004 6,621,51E+081
74AHC123APW74AHC123APW,11274AHC123APW
week 10, 2005 6,621,51E+081
74AHC123APW74AHC123APW,11874AHC123APW
week 10, 2005 6,621,51E+081
74AHCT123ABQ74AHCT123ABQ,11574AHCT123ABQ
Always Pb-free 6,621,51E+081
74AHCT123AD74AHCT123AD,11274AHCT123AD
week 5, 2005 6,621,51E+081
74AHCT123AD74AHCT123AD,11874AHCT123AD
week 5, 2005 6,621,51E+081
74AHCT123APW74AHCT123APW,11274AHCT123APW
week 10, 2005 6,621,51E+081
74AHCT123APW74AHCT123APW,11874AHCT123APW
week 10, 2005 6,621,51E+081

Quality and reliability disclaimer

Pricing/ordering/availability

Type numberOrdering code(12NC)Orderable part numberIndicative price/unit($)RegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
74AHC123ABQ9352 854 24115  74AHC123ABQ,115  NAARROW ELECTRONICS3,000 11/19/2009Buy onlinenot available
74AHC123AD9352 655 63112  74AHC123AD,112  0.2600      not available
74AHC123AD9352 655 63118  74AHC123AD,118  0.2600NAMOUSER ELECTRONICS100 11/20/2009Buy onlinenot available
    NAAVNET ELECTRONICS MARKETING2,500 11/19/2009Buy online 
    NAMOUSER ELECTRONICS100 11/20/2009Buy online 
74AHC123APW9352 655 64112  74AHC123APW,112  0.2600NADIGI-KEY CORPORATION4,007 11/20/2009Buy onlinenot available
    NAMOUSER ELECTRONICS225 11/20/2009Buy online 
    NAAVNET ELECTRONICS MARKETING4,500 11/19/2009Buy online 
    NAMOUSER ELECTRONICS225 11/20/2009Buy online 
74AHC123APW9352 655 64118  74AHC123APW,118  0.2600NAAVNET ELECTRONICS MARKETING1,100 11/19/2009Buy onlineOrder samples
    NAMOUSER ELECTRONICS344 11/20/2009Buy online 
    NAFUTURE ELECTRONICS47,500 11/19/2009Buy online 
    NAMOUSER ELECTRONICS344 11/20/2009Buy online 
74AHCT123ABQ9352 854 25115  74AHCT123ABQ,115  NAARROW ELECTRONICS3,000 11/19/2009Buy onlinenot available
74AHCT123AD9352 655 61112  74AHCT123AD,112  NAAVNET ELECTRONICS MARKETING4,000 11/19/2009Buy onlinenot available
74AHCT123AD9352 655 61118  74AHCT123AD,118  0.3000NAMOUSER ELECTRONICS86 11/20/2009Buy onlineOrder samples
    NAMOUSER ELECTRONICS86 11/20/2009Buy online 
74AHCT123APW9352 655 62112  74AHCT123APW,112  0.3200      not available
74AHCT123APW9352 655 62118  74AHCT123APW,118  0.3200NAFUTURE ELECTRONICS5,000 11/19/2009Buy onlinenot available
    NAARROW ELECTRONICS5,000 11/19/2009Buy online 

Block diagrams/pinning

Parametrics/similar products

Type numberPackageDescriptionPropagation Delay(ns)VoltageNo. of PinsPower Dissipation ConsiderationsLogic Switching LevelsOutput Drive Capability
74AHC123ABQSOT763-1
(DHVQFN16)
Dual Retriggerable Monostable Multivibrator with Reset; Triggerable via Reset Input5.1@5V2.0-5.5 V16Low Power or Battery ApplicationsCMOS+/- 8 mA
74AHC123ADSOT109
Dual Retriggerable Monostable Multivibrator with Reset; Triggerable via Reset Input5.1@5V2.0-5.5 V16Low Power or Battery ApplicationsCMOS+/- 8 mA
74AHC123APWSOT403-1
(TSSOP16)
Dual Retriggerable Monostable Multivibrator with Reset; Triggerable via Reset Input5.1@5V2.0-5.5 V16Low Power or Battery ApplicationsCMOS+/- 8 mA
74AHCT123ADSOT109
Dual Retriggerable Monostable Multivibrator with Reset; Triggerable via Reset Input; TTL Enabled54.5-5.5 V16Low PowerTTL+/- 8 mA
74AHCT123APWSOT403-1
(TSSOP16)
Dual Retriggerable Monostable Multivibrator with Reset; Triggerable via Reset Input; TTL Enabled54.5-5.5 V16Low PowerTTL+/- 8 mA


Similar products
74AHC123A; 74AHCT123A links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.