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71421 - Block Diagram


2K x 8 Dual-Port RAM w/Int

The 71421 is a high-speed 2K x 8 Dual-Port Static RAM with internal interrupt logic for interprocessor communications. It is designed to be used as a “SLAVE” Dual-Port RAM together with the 71321 “MASTER” Dual-Port in 16-bit-or-more word width systems which would result in full-speed, error free operation without the need for additional discrete logic. An automatic power down feature, controlled by CE, permits the on chip circuitry of each port to enter a very low standby power mode.


  • True Dual-Ported memory cells which allow simultaneous access of the same memory location
  • Two INT flags for port-to-port communications
  • BUSY input
  • Fully asynchronous operation from either port
  • Battery backup operation – 2V data retention (LA only)
  • TTL-compatible, single 5V ±10% power supply
  • Available in 52-Pin PLCC, 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 TypeAccess Time (ns)I/O Frequency (MHz)Temp. RangeArchitectureOrganizationFunctionOutput Type
5816PN64, PL52, PNG64, PLG52Async5.0 V TTL20, 25, 35, 55-40 to 85°C, 0 to 70°CDual-Port2K x 8Interrupt, Slave, Busy

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
71421LA20JActivePL52PLCC52CNoTubeCheck Availability
71421LA20J8ActivePL52PLCC52CNoReelCheck Availability
71421LA20JGActivePLG52PLCC52CYesTubeCheck Availability
71421LA20JG8ActivePLG52PLCC52CYesReelCheck Availability
71421LA20PFActivePN64TQFP64CNoTrayCheck Availability
71421LA20PF8ActivePN64TQFP64CNoReelCheck Availability
71421LA20PFGActivePNG64TQFP64CYesTrayCheck Availability
71421LA20PFG8ActivePNG64TQFP64CYesReelCheck Availability
71421LA25JActivePL52PLCC52CNoTubeCheck Availability
71421LA25J8ActivePL52PLCC52CNoReelCheck Availability
71421LA25JIActivePL52PLCC52INoTubeCheck Availability
71421LA25JI8ActivePL52PLCC52INoReelCheck Availability
71421LA25PFActivePN64TQFP64CNoTrayCheck Availability
71421LA25PF8ActivePN64TQFP64CNoReelCheck Availability
71421LA25PFGIActivePNG64TQFP64IYesTrayCheck Availability
71421LA25PFGI8ActivePNG64TQFP64IYesReelCheck Availability
71421LA25PFIActivePN64TQFP64INoTrayCheck Availability
71421LA25PFI8ActivePN64TQFP64INoReelCheck Availability
71421LA35JActivePL52PLCC52CNoTubeCheck Availability
71421LA35J8ActivePL52PLCC52CNoReelCheck Availability
71421LA35PFActivePN64TQFP64CNoTrayCheck Availability
71421LA35PF8ActivePN64TQFP64CNoReelCheck Availability
71421LA55JActivePL52PLCC52CNoTubeCheck Availability
71421LA55J8ActivePL52PLCC52CNoReelCheck Availability
71421LA55PFActivePN64TQFP64CNoTrayCheck Availability
71421LA55PF8ActivePN64TQFP64CNoReelCheck Availability
71421SA20JActivePL52PLCC52CNoTubeCheck Availability
71421SA20J8ActivePL52PLCC52CNoReelCheck Availability
71421SA20PFActivePN64TQFP64CNoTrayCheck Availability
71421SA20PF8ActivePN64TQFP64CNoReelCheck Availability
71421SA25JActivePL52PLCC52CNoTubeCheck Availability
71421SA25J8ActivePL52PLCC52CNoReelCheck Availability
71421SA25PFActivePN64TQFP64CNoTrayCheck Availability
71421SA25PF8ActivePN64TQFP64CNoReelCheck Availability
71421SA35JActivePL52PLCC52CNoTubeCheck Availability
71421SA35J8ActivePL52PLCC52CNoReelCheck Availability
71421SA35PFActivePN64TQFP64CNoTrayCheck Availability
71421SA35PF8ActivePN64TQFP64CNoReelCheck Availability
71421SA55JActivePL52PLCC52CNoTubeCheck Availability
71421SA55J8ActivePL52PLCC52CNoReelCheck Availability
71421SA55JIActivePL52PLCC52INoTubeCheck Availability
71421SA55JI8ActivePL52PLCC52INoReelCheck Availability
71421SA55PFActivePN64TQFP64CNoTrayCheck Availability
71421SA55PF8ActivePN64TQFP64CNoReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
71321/421 Datasheet Datasheet PDF 141 KB Oct 29, 2008
Apps Notes & White Papers
AN-68, Dual-Port SRAM Simplifies PC-to-TMS320 Interface Application Note PDF 92 KB May 31, 2006
AN-91, The Most Commonly Asked Questions About Async Dual-Ports Application Note PDF 87 KB May 31, 2006
AN-70, Dual-Port Interrupt Expansion Application Note PDF 56 KB May 31, 2006
show all (5)
AN-253, Introduction to Multi-Port Memories Application Note PDF 36 KB May 30, 2006
AN-09, Dual-Port SRAMs Yield Bit-Slice Designs Application Note PDF 69 KB May 30, 2006
PCN# : A1606-02 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 567 KB Aug 26, 2016
PCN#: A1309-03 Additional Assembly Sources Product Change Notice PDF 398 KB Oct 21, 2013
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 14, 2012
show all (20)
PCN# : A-0610-02 ASAT China as Alternate Facility for CABGA/CVBGA/FPBGA/TQFP/PQFP Product Change Notice PDF 252 KB Oct 19, 2006
PCN# A-0607-06 MMT Thailand as Alternate Assembly Facility for PLCC, SOIC 150mil/300mil Product Change Notice PDF 223 KB Oct 6, 2006
A-0603-04 Transfer TQFP and PQFP from ASAT HK to ASAT China Product Change Notice PDF 164 KB May 10, 2006
PCN#: TB-0512-01 Reel Color Changed from Blue to Black Product Change Notice PDF 729 KB Dec 16, 2005
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#: A-0309-04, new mold compound G600 material Product Change Notice PDF 134 KB Oct 7, 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-0203-05 Mold Compound Product Change Notice PDF 40 KB Apr 16, 2002
PCN SM-0202-02 Wafer Fab Transfer, Fab 2 to Fab4 Product Change Notice PDF 40 KB Feb 25, 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
71421J PLCC HSpice Model Model - HSPICE application/x-compress 19 KB Oct 12, 1998
71421J PLCC IBIS Model Model - IBIS ZIP 12 KB Jul 1, 1997
71421PF TQFP IBIS Model Model - IBIS ZIP 11 KB May 17, 2011
7142PF TQFP IBIS Model Model - IBIS ZIP 11 KB Nov 7, 1997
71421 VHDL Model Model - VHDL ZIP 9 KB Feb 18, 2005