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72291 - Block Diagram


128K x 9 SuperSync FIFO, 5.0V

The 72291 is a 128K x 9 SuperSync FIFO memory with clocked read and write controls. The Frequency Select pin (FS) has been removed, thus it is no longer necessary to select which of the two clock inputs, RCLK or WCLK, is running at the higher frequency. The period required by the retransmit operation and the first word data latency period is now fixed and short. (The variable clock cycle counting delay associated with the latency period found on previous SuperSync devices has been eliminated on this SuperSync family.)


  • Pin-compatible with the 722x1SuperSync FIFOs
  • 10ns read/write cycle time (6.5ns access time)
  • Fixed, low first word data latency time
  • Auto power down minimizes standby power consumption
  • Retransmit operation with fixed, low first word data latency time
  • Empty, Full and Half-Full flags signal FIFO status
  • Programmable Almost-Empty and Almost-Full flags
  • Easily expandable in depth and width
  • Independent Read and Write clocks (permit reading and writing simultaneously)
  • Available in 64-pin TQFP and STQFP packages
  • Industrial temperature range (–40C to +85C) is available

Product Specification

Core Voltage (V)Bus Width (bits)Density (Kb)Pkg. CodeInterfaceI/O TypeI/O Frequency (MHz)Cycle Time (ns)OrganizationTemp. RangeArchitectureAccess Time (ns)
591024PN64, PP64Synchronous5.0 V TTL50.00, 66.00, 100.0020128K x 9-40 to 85°C, 0 to 70°CUni-directional12

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
72291L10PFObsoletePN64TQFP64CNoTrayCheck Availability
72291L10PF8ObsoletePN64TQFP64CNoReelCheck Availability
72291L10TFObsoletePP64TQFP64CNoTrayCheck Availability
72291L10TF8ObsoletePP64TQFP64CNoReelCheck Availability
72291L15PFObsoletePN64TQFP64CNoTrayCheck Availability
72291L15PF8ObsoletePN64TQFP64CNoReelCheck Availability
72291L15PFIObsoletePN64TQFP64INoTrayCheck Availability
72291L15PFI8ObsoletePN64TQFP64INoReelCheck Availability
72291L15TFObsoletePP64TQFP64CNoTrayCheck Availability
72291L15TF8ObsoletePP64TQFP64CNoReelCheck Availability
72291L15TFIObsoletePP64TQFP64INoTrayCheck Availability
72291L15TFI8ObsoletePP64TQFP64INoReelCheck Availability
72291L20PFObsoletePN64TQFP64CNoTrayCheck Availability
72291L20PF8ObsoletePN64TQFP64CNoReelCheck Availability
72291L20PFIObsoletePN64TQFP64INoTrayCheck Availability
72291L20PFI8ObsoletePN64TQFP64INoReelCheck Availability
72291L20TFObsoletePP64TQFP64CNoTrayCheck Availability
72291L20TF8ObsoletePP64TQFP64CNoReelCheck Availability
72291L20TFIObsoletePP64TQFP64INoTrayCheck Availability
72291L20TFI8ObsoletePP64TQFP64INoReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
72281/72291 Datasheet Datasheet PDF 418 KB Mar 20, 2013
PDN# : CQ-14-08 Manufacturing Discontinunce PDN Product Discontinuation Notice PDF 486 KB Dec 1, 2014
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 14, 2012
A-0603-04 Transfer TQFP and PQFP from ASAT HK to ASAT China Product Change Notice PDF 164 KB May 10, 2006
show all (13)
PCN A-0506-03; Packing Material Change Product Change Notice PDF 290 KB Jul 19, 2005
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB Dec 14, 2004
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB Oct 10, 2003
PCN#: G-0302-06, New die attach 3230 from Ablestik Product Change Notice PDF 150 KB Mar 20, 2003
PCN#G-0302-05, New mold compound EME-G700 series Product Change Notice PDF 65 KB Mar 20, 2003
PCN# G-0206-08, Orientation of square PQFP & TQFP Product Change Notice PDF 150 KB Jun 17, 2002
PCN# G-0110-06 REV.1 Mold Compound Product Change Notice PDF 48 KB Apr 26, 2002
PCN# G-0110-06 Mold Compound Product Change Notice PDF 47 KB Dec 14, 2001
PCN# G0106-01, Moisture Sensitive Label Change Product Change Notice PDF 274 KB Jun 11, 2001
PCN# G9911-05, To qualify low alpha mold compound. Product Change Notice PDF 44 KB Nov 18, 1999

Software & Tools

Title Type Format File Size Datesort icon
72291 HSPICE Model - HSPICE application/x-tar 32 KB Jun 28, 1999
72291 IBIS Model - IBIS ZIP 11 KB Jan 22, 1999