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72V845 - Block Diagram


4K x 18 DualSync FIFO, 3.3V

The 72V845 is a 4K x 18 dual sync FIFO with clocked read and write controls that is functionally equivalent to two 72V245 FIFO’s in a single package with all associated control, data, and flag lines assigned to independent pins. This FIFO is useful for 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.


  • Optimal combination capacity , speed and design flexibility in a small footprint
  • 10 ns read/write cycle time
  • 5V input tolerant
  • 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
  • Asynchronous or synchronous programmable Almost-Empty and Almost-Full flags with default settings
  • Half-Full flag capability
  • Output enable puts output data bus in high-impedance state
  • Available in 128-pin TQFP
  • 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)
3.31872PK128, PKG128Synchronous3.3 V LVTTL50.00, 66.00, 100.004K 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
72V845L10PFActivePK128TQFP128CNoTrayCheck Availability
72V845L10PF8ActivePK128TQFP128CNoReelCheck Availability
72V845L10PFGActivePKG128TQFP128CYesTrayCheck Availability
72V845L10PFG8ActivePKG128TQFP128CYesReelCheck Availability
72V845L15PFActivePK128TQFP128CNoTrayCheck Availability
72V845L15PF8ActivePK128TQFP128CNoReelCheck Availability
72V845L15PFGIActivePKG128TQFP128IYesTrayCheck Availability
72V845L15PFGI8ActivePKG128TQFP128IYesReelCheck Availability
72V845L15PFIActivePK128TQFP128INoTrayCheck Availability
72V845L15PFI8ActivePK128TQFP128INoReelCheck Availability
72V845L20PFActivePK128TQFP128CNoTrayCheck Availability
72V845L20PF8ActivePK128TQFP128CNoReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
72V805-72V845 Datasheet Datasheet PDF 200 KB Nov 28, 2016
PCN# : A1606-02 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 567 KB Aug 26, 2016
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 14, 2012
A-0603-04 Transfer TQFP and PQFP from ASAT HK to ASAT China Product Change Notice PDF 164 KB May 10, 2006
show all (13)
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# 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
72V845 HSPICE Model - HSPICE application/x-tar 32 KB Jun 29, 1999
72V845 IBIS Model - IBIS ZIP 11 KB Apr 21, 1999