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72815 - Block Diagram


512 x 18 DualSync FIFO, 5.0V

The 72815 is a 512 x 18 First-In, First-Out memory with clocked read and write controls. It is functionally equivalent to two 72215 FIFOs in a single package with all associated control, data, and flag lines assigned to independent pins and would be applicable for a wide variety of data buffering needs, such as optical disk controllers, Local Area Networks (LANs), and interprocessor communication. Each of the two FIFOs has an 18-bit input and output 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.


  • Ideal for the following applications:
  • Network switching
  • Two level prioritization of parallel data
  • Bidirectional data transfer
  • Bus matching between 18 bit and 36 bit data paths
  • Width expansion to 36 bit per package
  • Depth expansion to 8,192 words per package
  • 10ns read/write cycle time, 6.5ns access time
  • IDT Standard or First Word Fall Through timing
  • Single or double register buffered Empty and Full Flags
  • Easily expandable in depth and width
  • Asynchronous or coincident Read and Write clocks
  • Async or sync programmable Almost Empty and Almost Full flags with default settings
  • Half Full flag capability
  • Available in 128-pin TQFP and 121 PBGA 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)
5189BG121, PK128Synchronous5.0 V TTL40.00, 66.00, 100.00512 x 18-40 to 85°C, 0 to 70°CDual FIFO

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
72815LB10PFActivePK128TQFP128CNoTrayCheck Availability
72815LB10PF8ActivePK128TQFP128CNoReelCheck Availability
72815LB15BGNot Recommended
BG121PBGA121CNoTrayCheck Availability
72815LB15BG8Not Recommended
BG121PBGA121CNoReelCheck Availability
72815LB15PFActivePK128TQFP128CNoTrayCheck Availability
72815LB15PF8ActivePK128TQFP128CNoReelCheck Availability
72815LB15PFIActivePK128TQFP128INoTrayCheck Availability
72815LB15PFI8ActivePK128TQFP128INoReelCheck Availability
72815LB25BGNot Recommended
BG121PBGA121CNoTrayCheck Availability
72815LB25BG8Not Recommended
BG121PBGA121CNoReelCheck Availability
72815LB25PFActivePK128TQFP128CNoTrayCheck Availability
72815LB25PF8ActivePK128TQFP128CNoReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
72805-72845 Datasheet Datasheet PDF 259 KB May 23, 2016
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 14, 2012
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
show all (9)
PCN#: A-0309-05, new m/c-G770 & d/a-2300 material Product Change Notice PDF 211 KB Oct 16, 2003
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# F0202-04R1: Wafer Fabrication Site Change Product Change Notice PDF 50 KB Jun 1, 2002
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