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74HC423; 74HCT423

Selection guide

Datasheet

74HC423; 74HCT423
(Product Specification)
24-Jul-08, 23 pages, 150 kB

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74HC423; 74HCT423 - 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

74HC423; 74HCT423 are high-speed Si-gate CMOS devices that are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

The 74HC423; 74HCT423 dual retriggerable monostable multivibrator with reset has two methods of output pulse width control.

  1. The minimum pulse width is essentially determined by the selection of an external resistor (REXT) and capacitor (CEXT), see Section 12.1.
  2. 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. When nRD is LOW, it forces the nQ output LOW, the nQ output HIGH and also inhibits the triggering. Figure 10 and Figure 11 illustrate pulse control by reset.

The nA and nB inputs' Schmitt trigger action makes them highly tolerant to slower input rise and fall times.

The 74HC423; 74HCT423 are identical to the 74HC123; 74HCT123 except that they cannot be triggered via the reset input.

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Features

  • DC triggered from active HIGH or active LOW inputs
  • Retriggerable for very long pulses up to 100pct duty factor
  • Direct reset terminates output pulse
  • Schmitt-trigger action on all inputs except for the reset input
  • Complies with JEDEC standard no. 7A
  • ESD protection:
    • HBM JESD22-A114E exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Specified from -40 Cel to +85 Cel and from -40 Cel to +125 Cel

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Products/packages

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarkingECCN
74HC423BQ74HC423BQ,1159352 854 28115Volume productionSOT763-1
(DHVQFN16) 		Reel Pack, SMD, 7"Standard Marking
74HC423D74HC423D,6529337 148 70652Volume productionSOT109Bulk Pack, CECCStandard Marking
74HC423D74HC423D,6539337 148 70653Volume productionSOT109Reel Pack, SMD, 13", CECCStandard Marking
74HC423N74HC423N,6529336 698 00652Volume productionSOT38-4
(DIP16) 		Bulk Pack, CECCStandard Marking
74HCT423BQ74HCT423BQ,1159352 854 26115Volume productionSOT763-1
(DHVQFN16) 		Reel Pack, SMD, 7"Standard Marking
74HCT423D74HCT423D,1129337 153 50112Volume productionSOT109Bulk PackStandard Marking
74HCT423D74HCT423D,1189337 153 50118Volume productionSOT109Reel Pack, SMD, 13"Standard Marking
74HCT423DB74HCT423DB,1129351 894 00112Volume productionSOT338-1
(SSOP16) 		TubeStandard Marking
74HCT423DB74HCT423DB,1189351 894 00118Volume productionSOT338-1
(SSOP16) 		Reel Pack, SMD, 13"Standard Marking
74HCT423N74HCT423N,1129336 704 30112Volume productionSOT38-4
(DIP16) 		Bulk PackStandard Marking
74HCT423PW74HCT423PW,1129351 896 30112Volume productionSOT403-1
(TSSOP16) 		TubeStandard Marking
74HCT423PW74HCT423PW,1189351 896 30118Volume productionSOT403-1
(TSSOP16) 		Reel Pack, SMD, 13"Standard Marking

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Quality/reliability/chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree Conversion dateRHFIRF (FIT)MTBF (hours)MSL
74HC423BQ74HC423BQ,11574HC423BQ
Always Pb-free 6,621,51E+081
74HC423D74HC423D,65274HC423D
week 6, 2004 6,621,51E+081
74HC423D74HC423D,65374HC423D
week 6, 2004 6,621,51E+081
74HC423N74HC423N,65274HC423N
Always Pb-free 6,621,51E+08NA
74HCT423BQ74HCT423BQ,11574HCT423BQ
Always Pb-free 6,621,51E+081
74HCT423D74HCT423D,11274HCT423D
week 6, 2004 6,621,51E+081
74HCT423D74HCT423D,11874HCT423D
week 6, 2004 6,621,51E+081
74HCT423DB74HCT423DB,11274HCT423DB
week 12, 2005 6,621,51E+081
74HCT423DB74HCT423DB,11874HCT423DB
week 12, 2005 6,621,51E+081
74HCT423N74HCT423N,11274HCT423N
Always Pb-free 6,621,51E+08NA
74HCT423PW74HCT423PW,11274HCT423PW
week 10, 2005 6,621,51E+081
74HCT423PW74HCT423PW,11874HCT423PW
week 10, 2005 6,621,51E+081

Quality and reliability disclaimer

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Pricing/ordering/availability

Type numberOrdering code(12NC)Orderable part numberIndicative price/unit($)RegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
74HC423BQ9352 854 28115  74HC423BQ,115        not available
74HC423D9337 148 70652  74HC423D,652  0.3900NAARROW ELECTRONICS42 11/19/2009Buy onlinenot available
    NADIGI-KEY CORPORATION1,868 11/20/2009Buy online 
    NAAVNET ELECTRONICS MARKETING2,912 11/19/2009Buy online 
74HC423D9337 148 70653  74HC423D,653  0.3900NAARROW ELECTRONICS42 11/19/2009Buy onlineOrder samples
    NAAVNET ELECTRONICS MARKETING1,456 11/19/2009Buy online 
    NAMOUSER ELECTRONICS2,103 11/20/2009Buy online 
    NAAVNET ELECTRONICS MARKETING5,000 11/19/2009Buy online 
    NAMOUSER ELECTRONICS2,103 11/20/2009Buy online 
    ASIASACL - Hong Kong/Chinayes250011/20/2009Buy online 
74HC423N9336 698 00652  74HC423N,652  0.4500NAARROW ELECTRONICS775 11/19/2009Buy onlineOrder samples
    NADIGI-KEY CORPORATION940 11/20/2009Buy online 
    NAMOUSER ELECTRONICS669 11/20/2009Buy online 
    NAMOUSER ELECTRONICS669 11/20/2009Buy online 
74HCT423BQ9352 854 26115  74HCT423BQ,115        not available
74HCT423D9337 153 50112  74HCT423D,112  0.3900NAARROW ELECTRONICS1,048 11/19/2009Buy onlinenot available
74HCT423D9337 153 50118  74HCT423D,118  0.3900NAARROW ELECTRONICS1,048 11/19/2009Buy onlinenot available
    NAFUTURE ELECTRONICS2,500 11/19/2009Buy online 
74HCT423DB9351 894 00112  74HCT423DB,112  0.3900NADIGI-KEY CORPORATION1,347 11/20/2009Buy onlinenot available
74HCT423DB9351 894 00118  74HCT423DB,118  0.3900      not available
74HCT423N9336 704 30112  74HCT423N,112  0.4500NAARROW ELECTRONICS850 11/19/2009Buy onlineOrder samples
    NAMOUSER ELECTRONICS1,941 11/20/2009Buy online 
    NAMOUSER ELECTRONICS1,941 11/20/2009Buy online 
74HCT423PW9351 896 30112  74HCT423PW,112  0.3900      not available
74HCT423PW9351 896 30118  74HCT423PW,118  0.3900      Order samples
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Block diagrams/pinning

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Design support

Support Documents

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Parametrics/similar products

Type numberPackageDescriptionPropagation Delay(ns)VoltageNo. of PinsPower Dissipation ConsiderationsLogic Switching LevelsOutput Drive Capability
74HC423DSOT109
Dual Retriggerable Monostable Multivibrator with Reset23@5V2.0-6.0 V16Low Power or Battery ApplicationsCMOS+/- 5.2 mA
74HC423NSOT38-4
(DIP16)		Dual Retriggerable Monostable Multivibrator with Reset23@5V2.0-6.0 V16Low Power or Battery ApplicationsCMOS+/- 5.2 mA
74HCT423DSOT109
Dual Retriggerable Monostable Multivibrator with Reset; TTL Enabled264.5-5.5 V16Low PowerTTL+/- 4 mA
74HCT423DBSOT338-1
(SSOP16)		Dual Retriggerable Monostable Multivibrator with Reset; TTL Enabled264.5-5.5 V16Low PowerTTL+/- 4 mA
74HCT423NSOT38-4
(DIP16)		Dual Retriggerable Monostable Multivibrator with Reset; TTL Enabled264.5-5.5 V16Low PowerTTL+/- 4 mA
74HCT423PWSOT403-1
(TSSOP16)		Dual Retriggerable Monostable Multivibrator with Reset; TTL Enabled264.5-5.5 V16Low PowerTTL+/- 4 mA


Similar products
74HC423; 74HCT423 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.

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