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ADG3257:  High Speed, 3.3 V/5 V Quad 2:1 Mux/Demux (4-Bit, 1 of 2) Bus Switch

Product Details

The ADG3257 is a CMOS bus switch comprising four 2:1 multiplexer/demultiplexers with high impedance outputs. The device is manufactured on a CMOS process, which provides low power dissipation yet gives high switching speed and very low on resistance allowing the inputs to be connected to the outputs without adding propagation delay or generating additional ground bounce noise.

The ADG3257 operates from a single 3.3 V/5 V supply. The control logic for each switch is shown in the Truth Table in the data sheet. These switches are bi-directional when ON. In the OFF condition, signal levels up to the supplies are blocked.

This Bus Switch is suited to both switching and level translation application. It may be used in applications requiring level translation from 3.3 V to 2.5V when powered from 3.3 V. Additionally, with a diode connected in series with 5 V VDD, the ADG3257 may also be used in applications requiring 5 V to 3.3 V level translation.


  • 100 ps Propagation Delay through the Switch
  • 2 Ω Max Switches Connect Inputs to Outputs
  • Data Rates up to 933 Mbps
  • Single 3.3 V/5 V Supply Operation
  • Level Translation Operation
  • Ultralow Quiescent Supply Current
    (1 nA Typical)
  • 3.5 ns Switching
  • Standard '3257 Type Pinout

Functional Block Diagram for ADG3257


Title Content Type File Type
ADG3257: High Speed, 3.3 V/5 V Quad 2:1 Mux/Demux (4-Bit, 1 of 2) Bus Switch Data Sheet  (Rev E, 03/2008) (pdf, 126 kB) Data Sheets PDF
Data-acquisition system uses fault protection
By Catherine Redmond, Analog Devices, Inc. (EDN, 4/15/2004)
Technical Articles HTML
CMOS Switches Offer High Performance in Low Power, Wideband Applications  (pdf, 320 kB)
by Theresa Corrigan and Ray Goggin, Analog Devices, Inc. (High Frequency Electronics, February 2004)
Technical Articles PDF
Enhanced Multiplexing for MEMS Optical Cross Connects
by James Caffrey (Fiberoptic Product News, 8/2003)
Technical Articles HTML
Bus Switches for Speed, Safety, and Efficiency: What They Are and What You Should Know About Them.
Bus switches are characterized by sub-nanosecond propagation delay and fast switching, and are designed for connecting to high-speed digital buses. They are ideally suited for voltage translation, hot swapping, hot plug, bus- or capacitance isolation, and many other applications. The key features that make them suitable for so many different applications include low on-resistance, low capacitance, and low propagation delay.
Analog Dialogue HTML
Switches and Multiplexers Product Selection Guide  (pdf, 1462 kB) Product Selection Guide PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

ADG3257 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
ADG3257BRQ Status: Production 16 ld QSOP 16 Ind Tube, 98 $0.84 $0.69 N  Material Info PCN Purchase
ADG3257BRQ-REEL Status: Last Time Buy 16 ld QSOP 16 Ind Reel, 2500 - $0.69 N  Material Info PCN/PDN Purchase
ADG3257BRQZ Status: Production 16 ld QSOP 16 Ind Tube, 98 $0.73 $0.60 Y  Material Info PCN Purchase Sample
ADG3257BRQZ-REEL Status: Production 16 ld QSOP 16 Ind Reel, 2500 - $0.60 Y  Material Info PCN Purchase
ADG3257BRQZ-REEL7 Status: Production 16 ld QSOP 16 Ind Reel, 1000 - $0.60 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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