2K x 9 Dual-Port RAM

The 70121 is a high-speed 2K x 9 Dual-Port Static RAM designed to be used as a stand-alone 9-bit Dual- Port RAM or as a "MASTER" Dual-Port RAM together with the 70125 "SLAVE" Dual-Port in 18-bit-or-more word width systems. Using the IDT MASTER/SLAVE Dual-Port RAM approach in 18-bit-or-wider memory system applications results 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.

Features

  • Fully asynchronous operation from either port
  • MASTER 70121 easily expands data bus width to 18 bits or more using SLAVE 70125 chip
  • On-chip port arbitration logic (70121 only)
  • BUSY output flag on Master
  • BUSY input on Slave
  • INT flag for port-to-port communication
  • Battery backup operation—2V data retention
  • TTL-compatible, signal 5V (±10%) power supply
  • Available in 52-pin PLCC
  • Industrial temperature range (–40C to +85C) is available for selected speeds
  • Green parts available, see ordering information

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
70121L25J Last Time Buy PL52 PLCC 52 C No Tube Availability
70121L25J8 Last Time Buy PL52 PLCC 52 C No Reel Availability
70121L25JG Active PLG52 PLCC 52 C Yes Tube Availability
70121L25JG8 Active PLG52 PLCC 52 C Yes Reel Availability
70121L35J Last Time Buy PL52 PLCC 52 C No Tube Availability
70121L35J8 Last Time Buy PL52 PLCC 52 C No Reel Availability
70121L35JI Last Time Buy PL52 PLCC 52 I No Tube Availability
70121L35JI8 Last Time Buy PL52 PLCC 52 I No Reel Availability
70121L55J Last Time Buy PL52 PLCC 52 C No Tube Availability
70121L55J8 Last Time Buy PL52 PLCC 52 C No Reel Availability
70121S25J Last Time Buy PL52 PLCC 52 C No Tube Availability
70121S25J8 Last Time Buy PL52 PLCC 52 C No Reel Availability
70121S35J Last Time Buy PL52 PLCC 52 C No Tube Availability
70121S35J8 Last Time Buy PL52 PLCC 52 C No Reel Availability
70121S55J Last Time Buy PL52 PLCC 52 C No Tube Availability
70121S55J8 Last Time Buy PL52 PLCC 52 C No Reel Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
70121/5 Data Sheet Datasheet PDF 193 KB Aug 26, 2014
Application Notes & White Papers
AN-70, Dual-Port Interrupt Expansion Application Note PDF 56 KB May 30, 2006
AN-91, The Most Commonly Asked Questions About Async Dual-Ports Application Note PDF 87 KB May 30, 2006
AN-68, Dual-Port SRAM Simplifies PC-to-TMS320 Interface Application Note PDF 92 KB May 30, 2006
AN-09, Dual-Port SRAMs Yield Bit-Slice Designs Application Note PDF 69 KB May 29, 2006
AN-253, Introduction to Multi-Port Memories Application Note PDF 36 KB May 29, 2006
PCNs & PDNs
PDN# : SP-17-02 PRODUCT DISCONTINUANCE NOTICE FOR SPO DEVICES Product Discontinuation Notice PDF 645 KB Sep 14, 2017
PCN# : TB1703-01 Change of MSL Level on PLCC-52 Product Change Notice PDF 157 KB May 8, 2017
PCN# G-0203-05 Mold Compound Product Change Notice PDF 40 KB Apr 15, 2002
PCN# A-0607-06 MMT Thailand as Alternate Assembly Facility for PLCC, SOIC 150mil/300mil Product Change Notice PDF 223 KB Oct 5, 2006
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB Dec 13, 2004
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 13, 2012
PCN# G0106-01, Moisture Sensitive Label Change Product Change Notice PDF 274 KB Jun 10, 2001
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB Oct 9, 2003
PCN# G9911-05, To qualify low alpha mold compound. Product Change Notice PDF 44 KB Nov 17, 1999
PCN#: TB-0512-01 Reel Color Changed from Blue to Black Product Change Notice PDF 729 KB Dec 15, 2005
PCN # SM0308-02 Fab 2 to Fab 4 Transfer Product Change Notice PDF 124 KB Aug 14, 2003
PCN#: A-0309-04, new mold compound G600 material Product Change Notice PDF 134 KB Oct 6, 2003