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QS3251 - Block Diagram

QS3251

High-Speed CMOS QuickSwitch 8:1 Mux/Demux

The QS3251 is a high-speed CMOS TTL-compatible 8:1 multiplexer/ demultiplexer. The QS3251 has 3-state outputs. The QS3251 is a function and pinout compatible version of the 74F251, 74FCT251 and the 74ALS/ AS/LS251 8:1 multiplexers. The low ON resistance of the QS3251 allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise. Mux/Demux devices provide an order of magnitude faster speed than equivalent logic devices. The QS3251 is characterized for operation at -40C to +85C.

Features

  • Enhanced N channel FET with no inherent diode to Vcc
  • 5 ohm bidirectional switches connect inputs to outputs
  • Zero propagation delay, zero ground bounce
  • Undershoot clamp diodes on all switch and control inputs
  • TTL-compatible control inputs
  • Video, audio, graphics switching, muxing
  • Hot-swapping, hot-docking
  • Voltage translation (5V to 3.3V)
  • Available in 16 pin QSOP and S1 packages

Product Specification

FunctionPkg. CodeTemp. RangeBus Width (bits)Core Voltage (V)Output TypeOn Resistance (Ω)Speed Grade
8:1 Mux/DemuxDCG16, PCG16-40 to 85°C855Standard

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
QS3251QGActivePCG16QSOP16IYesTubeCheck Availability
QS3251QG8ActivePCG16QSOP16IYesReelCheck Availability
QS3251S1GActiveDCG16SOIC16IYesTubeCheck Availability
QS3251S1G8ActiveDCG16SOIC16IYesReelCheck Availability

Documents

Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
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QS3251 Datasheet Datasheet PDF 216 KB Feb 14, 2011
Apps Notes & White Papers
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AN-11: 5V and 3V Conversion with Zero Delay Application Note PDF 346 KB Feb 5, 2014
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Quickswitch Basics Application Note PDF 83 KB Jul 6, 2005
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AN-19: Space Reduction Via Placement Application Note PDF 41 KB Jun 1, 1996
show all (8)
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AN-09: CMOS Bus Switches Provide 0 Delay Application Note PDF 121 KB Jun 1, 1996
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AN-13: Converting TTL to Hot Plug Application Note PDF 85 KB Jun 1, 1996
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AN-20: Board Assembly for 0.4mm Pin Surface Mounts Application Note PDF 62 KB Jun 1, 1996
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AN-17: Peripheral Isolation in Notebook Computers Application Note PDF 68 KB Jun 1, 1996
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TN-07: Analysis of QuickSwitch Behavior Application Note PDF 102 KB Jun 1, 1996
PCNs & PDNs
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PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Apr 14, 2016
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PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Feb 15, 2016
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PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 14, 2012
show all (14)
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PCN# A-0508-02: OSET Alternate Assembly Location for Green Product Change Notice PDF 18 KB Sep 2, 2005
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PCN#A-0504-02R1: Assembly Transfer IDT-Manila to OSE-Ph Product Change Notice PDF 16 KB Jul 22, 2005
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PCN#: TB-0504-01, Transfer Test & Backend from IDT-Manila to IDT Product Change Notice PDF 35 KB Apr 29, 2005
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PCN#: A-0504-02, Transfer assembly facility IDT-Manila to OSE-Ph Product Change Notice PDF 47 KB Apr 29, 2005
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PCN#:A-0401-01, new m/c G600 & 8290 d/a material Product Change Notice PDF 196 KB Jan 19, 2004
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PCN#:A-0312-02, new die attach material - 8290 Product Change Notice PDF 116 KB Dec 3, 2003
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PCN#:A-0312-01, new mold compound material - G600 Product Change Notice PDF 109 KB Dec 3, 2003
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PCN# L0212-01 Fab Site Change to Fab 4 Product Change Notice PDF 50 KB Dec 16, 2002
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PCN# G-0203-05 Mold Compound Product Change Notice PDF 40 KB Apr 16, 2002
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PCN# G0106-01, Moisture Sensitive Label Change Product Change Notice PDF 274 KB Jun 11, 2001
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PCN# G0005-01, Laser Top Mark Product Change Notice PDF 24 KB May 10, 2000

Software & Tools

Title Type Format File Size Datesort icon
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QS3251 IBIS Model Model - IBIS ZIP 14 KB Nov 2, 2000