8-Bit Identity Comparator

The IDT74FCT521T is an 8-bit identity comparator that compares two words of up to eight bits each and provides a low output when the two words match bit for bit. The expansion input IA = B also serves as an active low enable input. The 74FCT521T operates at -40C to +85C

Features

  • A and C speeds
  • Low input and output leakage ?1 uA (max.)
  • CMOS power levels
  • True TTL input and output compatibility
  • VOH = 3.3V (typ.)
  • VOL = 0.3V (typ.)
  • High Drive outputs (-15mA IOH, 48mA IOL)
  • Meets or exceeds JEDEC standard 18 specifications
  • Power off disable outputs permit "live insertion"
  • Available in 20 pin SOIC and QSOP packages

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
74FCT521ATQG Active PCG20 QSOP 20 I Yes Tube Availability
74FCT521ATQG8 Active PCG20 QSOP 20 I Yes Reel Availability
74FCT521ATSOG Active PSG20 SOIC 20 I Yes Tube Availability
74FCT521ATSOG8 Active PSG20 SOIC 20 I Yes Reel Availability
74FCT521CTQG Active PCG20 QSOP 20 I Yes Tube Availability
74FCT521CTQG8 Active PCG20 QSOP 20 I Yes Reel Availability
74FCT521CTSOG Active PSG20 SOIC 20 I Yes Tube Availability
74FCT521CTSOG8 Active PSG20 SOIC 20 I Yes Reel Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
PDN# L_05_01: Obsolescence Notice ALL PDF 130 KB Jul 21, 2005
74FCT521T Datasheet Datasheet PDF 48 KB Nov 15, 2016
Application Notes & White Papers
AN-154: Estimating Power Dissipation in CMOS Application Note PDF 30 KB May 31, 1996
AN-154: Estimating Power Dissipation in CMOS Application Note PDF 30 KB May 31, 1996
AN-147: The Myth of Ground Bounce Measurements Application Note PDF 143 KB May 31, 1996
AN-152: FCT-T Octal Logic Characteristics... Application Note PDF 158 KB May 31, 1996
PCNs & PDNs
PDN# Logic-01-04: Obsolescence Notice Product Discontinuation Notice PDF 41 KB Apr 30, 2001
PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Apr 13, 2016
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Feb 14, 2016
PDN# Logic-00-09: Obsolete PDIP Package Product Discontinuation Notice PDF 73 KB Apr 23, 2001
PDN# Logic-00-07: Obsolete Selective Speed Grades Product Delete Notice PDF 14 KB Apr 24, 2001
PCN# G-0203-05 Mold Compound Product Change Notice PDF 40 KB Apr 15, 2002
PCN#A-0504-02R1: Assembly Transfer IDT-Manila to OSE-Ph Product Change Notice PDF 16 KB Jul 21, 2005
PCN# A-0504-02R2: Assembly Transfer IDT-Manila to OSE-Ph Product Change Notice PDF 38 KB Aug 3, 2005
PCN#: A-0504-02, Transfer assembly facility IDT-Manila to OSE-Ph Product Change Notice PDF 47 KB Apr 28, 2005
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# A-0508-02: OSET Alternate Assembly Location for Green Product Change Notice PDF 18 KB Sep 1, 2005
PCN#: A-0501-01, New m/c DMC-2000 and d/a 8390A for PDIP pkgs Product Change Notice PDF 42 KB Jan 24, 2005
PCN# G0005-01, Laser Top Mark Product Change Notice PDF 24 KB May 9, 2000
PCN# G0106-01, Moisture Sensitive Label Change Product Change Notice PDF 274 KB Jun 10, 2001
PCN#:A-0401-01, new m/c G600 & 8290 d/a material Product Change Notice PDF 196 KB Jan 18, 2004
PCN#:A-0312-02, new die attach material - 8290 Product Change Notice PDF 116 KB Dec 2, 2003
PCN#:A-0312-01, new mold compound material - G600 Product Change Notice PDF 109 KB Dec 2, 2003
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB Oct 9, 2003
PCN # A-0406-07Rev.1, Qualify OSE-Taiwan for SSOP & TSSOP Product Change Notice PDF 21 KB Oct 21, 2004
PCN#: TB-0504-01, Transfer Test & Backend from IDT-Manila to IDT Product Change Notice PDF 35 KB Apr 28, 2005
PCN# G9911-05, To qualify low alpha mold compound. Product Change Notice PDF 44 KB Nov 17, 1999
PCN# G0202-01, Alternate assembly facility Product Change Notice PDF 16 KB Feb 7, 2002
PCN#:A-0309-06 Rev1, Hermetic transfer to ATP-P1 Product Change Notice PDF 44 KB Oct 14, 2004
PCN# L0203-09R1 Tech Upgrade & Fab Transfer Product Change Notice PDF 98 KB May 28, 2003
PCN # L0203-09R2 Addendum Fab Transfer from Fab 2 to Fab 4 Product Change Notice PDF 101 KB Aug 15, 2004
PCN# : TB0808-04 QTY PER TUBE CHANGE FOR SSOP-20 Product Change Notice PDF 55 KB Oct 12, 2008

Software & Tools

Title Other Languages Type Format File Size Date
74FCT521T IBIS Model Model - IBIS ZIP 9 KB May 22, 2002