Skip to main content
71321 - Block Diagram


2K x 8 Dual-Port RAM w/Int

The 71321 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 stand-alone 8-bit Dual-Port RAM or as a “MASTER” Dual-Port RAM together with the 71421 “SLAVE” 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
  • Easily expands data bus width to 16-or more- bits using SLAVE 71421
  • On-chip port arbitration logic
  • BUSY output flag
  • 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
5816PL52, PP64, PN64, PPG64, PLG52, PNG64Async5.0 V TTL20, 25, 35, 45, 55-40 to 85°C, 0 to 70°CDual-Port2K x 8Master, Interrupt, Busy

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
71321LA20JActivePL52PLCC52CNoTubeCheck Availability
71321LA20J8ActivePL52PLCC52CNoReelCheck Availability
71321LA20JGActivePLG52PLCC52CYesTubeCheck Availability
71321LA20JG8ActivePLG52PLCC52CYesReelCheck Availability
71321LA20PFActivePN64TQFP64CNoTrayCheck Availability
71321LA20PF8ActivePN64TQFP64CNoReelCheck Availability
71321LA20PFGActivePNG64TQFP64CYesTrayCheck Availability
71321LA20PFG8ActivePNG64TQFP64CYesReelCheck Availability
71321LA20TFActivePP64TQFP64CNoTrayCheck Availability
71321LA20TF8ActivePP64TQFP64CNoReelCheck Availability
71321LA20TFGActivePPG64TQFP64CYesTrayCheck Availability
71321LA20TFG8ActivePPG64TQFP64CYesReelCheck Availability
71321LA25JActivePL52PLCC52CNoTubeCheck Availability
71321LA25J8ActivePL52PLCC52CNoReelCheck Availability
71321LA25JGIActivePLG52PLCC52IYesTubeCheck Availability
71321LA25JGI8ActivePLG52PLCC52IYesReelCheck Availability
71321LA25JIActivePL52PLCC52INoTubeCheck Availability
71321LA25JI8ActivePL52PLCC52INoReelCheck Availability
71321LA25PFActivePN64TQFP64CNoTrayCheck Availability
71321LA25PF8ActivePN64TQFP64CNoReelCheck Availability
71321LA25PFGIActivePNG64TQFP64IYesTrayCheck Availability
71321LA25PFGI8ActivePNG64TQFP64IYesReelCheck Availability
71321LA25PFIActivePN64TQFP64INoTrayCheck Availability
71321LA25PFI8ActivePN64TQFP64INoReelCheck Availability
71321LA25TFActivePP64TQFP64CNoTrayCheck Availability
71321LA25TF8ActivePP64TQFP64CNoReelCheck Availability
71321LA25TFGIActivePPG64TQFP64IYesTrayCheck Availability
71321LA25TFGI8ActivePPG64TQFP64IYesReelCheck Availability
71321LA25TFIActivePP64TQFP64INoTrayCheck Availability
71321LA25TFI8ActivePP64TQFP64INoReelCheck Availability
71321LA35JActivePL52PLCC52CNoTubeCheck Availability
71321LA35J8ActivePL52PLCC52CNoReelCheck Availability
71321LA35PFActivePN64TQFP64CNoTrayCheck Availability
71321LA35PF8ActivePN64TQFP64CNoReelCheck Availability
71321LA35TFActivePP64TQFP64CNoTrayCheck Availability
71321LA35TF8ActivePP64TQFP64CNoReelCheck Availability
71321LA45JActivePL52PLCC52CNoTubeCheck Availability
71321LA45J8ActivePL52PLCC52CNoReelCheck Availability
71321LA55JActivePL52PLCC52CNoTubeCheck Availability
71321LA55J8ActivePL52PLCC52CNoReelCheck Availability
71321LA55PFActivePN64TQFP64CNoTrayCheck Availability
71321LA55PF8ActivePN64TQFP64CNoReelCheck Availability
71321LA55TFActivePP64TQFP64CNoTrayCheck Availability
71321LA55TF8ActivePP64TQFP64CNoReelCheck Availability
71321LA55TFGActivePPG64TQFP64CYesTrayCheck Availability
71321LA55TFG8ActivePPG64TQFP64CYesReelCheck Availability
71321SA20JActivePL52PLCC52CNoTubeCheck Availability
71321SA20J8ActivePL52PLCC52CNoReelCheck Availability
71321SA20PFActivePN64TQFP64CNoTrayCheck Availability
71321SA20PF8ActivePN64TQFP64CNoReelCheck 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-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
AN-68, Dual-Port SRAM Simplifies PC-to-TMS320 Interface Application Note PDF 92 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# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Apr 14, 2016
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Feb 15, 2016
show all (23)
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 22, 2015
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 21, 2015
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
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-0302-05, 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# 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
71321J PLCC HSpice Model Model - HSPICE application/x-compress 19 KB Oct 12, 1998
71321PF TQFP IBIS Model Model - IBIS ZIP 11 KB Jul 1, 1997