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72V821 - Block Diagram


1K x 9 DualSync FIFO, 3.3V

The 72V821is a 1K x 9 dual synchronous FIFO that is functionally equivalent to two 72V221 FIFOs in a single package with all associated control, data, and flag lines assigned to separate pins. Each FIFOs has a 9-bit input and output data port. The Read Clock can be tied to the Write Clock for single clock operation or the two clocks can run asynchronous of one another for dual clock operation.


  • Offers optimal combination of capacity, speed, and design flexibility in small footprint
  • Ideal for prioritization, bidirectional, and width expansion applications
  • 10 ns read/write cycle time
  • 5V input tolerant
  • Separate control lines and data lines for each FIFO
  • Separate Empty, Full, programmable Almost-Empty and Almost-Full flags for each FIFO
  • Enable puts output data lines in high-impedance state
  • 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)
3.399PP64, PN64Synchronous3.3 V LVTTL50.00, 66.00, 100.001K x 9-40 to 85°C, 0 to 70°CDual FIFO

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
72V821L10PFActivePN64TQFP64CNoTrayCheck Availability
72V821L10PF8ActivePN64TQFP64CNoReelCheck Availability
72V821L10TFObsoletePP64TQFP64CNoTrayCheck Availability
72V821L10TF8ObsoletePP64TQFP64CNoReelCheck Availability
72V821L15PFActivePN64TQFP64CNoTrayCheck Availability
72V821L15PF8ActivePN64TQFP64CNoReelCheck Availability
72V821L15PFINot Recommended
PN64TQFP64INoTrayCheck Availability
72V821L15PFI8Not Recommended
PN64TQFP64INoReelCheck Availability
72V821L15TFObsoletePP64TQFP64CNoTrayCheck Availability
72V821L15TF8ObsoletePP64TQFP64CNoReelCheck Availability
72V821L15TFIObsoletePP64TQFP64INoTrayCheck Availability
72V821L15TFI8ObsoletePP64TQFP64INoReelCheck Availability
72V821L20PFActivePN64TQFP64CNoTrayCheck Availability
72V821L20PF8ActivePN64TQFP64CNoReelCheck Availability
72V821L20TFObsoletePP64TQFP64CNoTrayCheck Availability
72V821L20TF8ObsoletePP64TQFP64CNoReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
72V801-72V851 Datasheet Datasheet PDF 166 KB Nov 6, 2014
PDN# CQ-14-05 MARKET DECLINED PRODUCT 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
PCN# : A-0610-02 ASAT China as Alternate Facility for CABGA/CVBGA/FPBGA/TQFP/PQFP Product Change Notice PDF 252 KB Oct 19, 2006
show all (15)
A-0603-04 Transfer TQFP and PQFP from ASAT HK to ASAT China Product Change Notice PDF 164 KB May 10, 2006
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-0302-05, New mold compound EME-G700 series Product Change Notice PDF 65 KB Mar 20, 2003
PCN#: G-0302-06, New die attach 3230 from Ablestik Product Change Notice PDF 150 KB Mar 20, 2003
PCN# G-0206-08, Orientation of square PQFP & TQFP Product Change Notice PDF 150 KB Jun 17, 2002
PCN# F0202-04R1: Wafer Fabrication Site Change Product Change Notice PDF 50 KB Jun 1, 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
72V821 HSPICE Model - HSPICE application/x-tar 32 KB Jun 28, 1999
72V821 IBIS Model - IBIS ZIP 10 KB Apr 21, 1999