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72403 - Block Diagram


64 x 4 AsyncFIFO w/Output Enable, 5.0V

The 72403 is an asynchronous 64 x 4 First-ln/First-Out memory with an output enable pin. Reading and writing operations are completely asynchronous allowing the FIFO to be used as a buffer between two digital machines of widely varying operating frequencies. The 45MHz speed makes this FlFO ideal for high speed communication and controller applications.


  • RAM-based FIFO with low fall-through time
  • Low-power consumption
  • Maximum shift rate — 45MHz
  • High data output drive capability
  • Fully expandable by bit width
  • Fully expandable by word depth
  • MlL-STD-883, Class B in 16 pin Cerdip package
  • Industrial temperature range (–40C to +85C) is available
  • Available in 16 pin plastic DIP and SOIC packages

Product Specification

Core Voltage (V)Bus Width (bits)Density (Kb)Pkg. CodeInterfaceI/O TypeOrganizationTemp. RangeArchitectureAccess Time (ns)
540.256PS16, PD16, CD16Asynchronous5.0 V TTL64 x 4-55 to 125°C, 0 to 70°CUni-directional

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
72403L10DBObsoleteCD16CDIP16MNoTubeCheck Availability
72403L10PObsoletePD16PDIP16CNoTubeCheck Availability
72403L10SOObsoletePS16SOIC16CNoTubeCheck Availability
72403L10SO8ObsoletePS16SOIC16CNoReelCheck Availability
72403L15PObsoletePD16PDIP16CNoTubeCheck Availability
72403L15SOObsoletePS16SOIC16CNoTubeCheck Availability
72403L15SO8ObsoletePS16SOIC16CNoReelCheck Availability
72403L25PObsoletePD16PDIP16CNoTubeCheck Availability
72403L25SOObsoletePS16SOIC16CNoTubeCheck Availability
72403L25SO8ObsoletePS16SOIC16CNoReelCheck Availability
72403L35DBObsoleteCD16CDIP16MNoTubeCheck Availability
72403L35PObsoletePD16PDIP16CNoTubeCheck Availability
72403L35SOObsoletePS16SOIC16CNoTubeCheck Availability
72403L35SO8ObsoletePS16SOIC16CNoReelCheck Availability
72403L45PObsoletePD16PDIP16CNoTubeCheck Availability
72403L45SOObsoletePS16SOIC16CNoTubeCheck Availability
72403L45SO8ObsoletePS16SOIC16CNoReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
72401/72403 Datasheet Datasheet PDF 275 KB Jun 29, 2012
PDN# : CQ-14-06R1 Revised Product Discontinuance Notice Product Discontinuation Notice PDF 407 KB Sep 8, 2014
PDN# : CQ-14-06 MANUFACTURING DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 192 KB Sep 4, 2014
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 14, 2012
show all (16)
PCN# A-0607-06 MMT Thailand as Alternate Assembly Facility for PLCC, SOIC 150mil/300mil Product Change Notice PDF 223 KB Oct 6, 2006
PCN# : A-0605-05 AIT as Alternate Assembly Facility for SOIC/QSOP/SSOP/TSSOP/PDIP Product Change Notice PDF 298 KB May 25, 2006
PCN#: A-0501-01, New m/c DMC-2000 and d/a 8390A for PDIP pkgs Product Change Notice PDF 42 KB Jan 25, 2005
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB Dec 14, 2004
PCN#:A-0309-06 Rev1, Hermetic transfer to ATP-P1 Product Change Notice PDF 44 KB Oct 15, 2004
PCN#: A-0305-04 Rev. 01, Tin Plating and Solder Dip Process at G Product Change Notice PDF 38 KB Mar 4, 2004
PCN#:A-0401-01, new m/c G600 & 8290 d/a material Product Change Notice PDF 196 KB Jan 19, 2004
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB Oct 10, 2003
PCN# G-0203-05 Mold Compound Product Change Notice PDF 40 KB Apr 16, 2002
PCN# G0106-01, Moisture Sensitive Label Change Product Change Notice PDF 274 KB Jun 11, 2001
PDN for selected Military grade FIFO products Product Delete Notice PDF 45 KB Feb 5, 2001
PCN# G0005-01, Laser Top Mark Product Change Notice PDF 24 KB May 10, 2000
PCN# G9911-05, To qualify low alpha mold compound. Product Change Notice PDF 44 KB Nov 18, 1999