USB 2.0 Hi-Speed Differential 8:1 Multiplexer

Industry's First 8:1 USB Mux Supports USB 2.0 Hi-Speed Data Rates for Extremely Fast Switching


The MAX4999 differential Hi-Speed USB analog multiplexer features low on-capacitance (CON) switching, making it an ideal solution for the USB server/mass storage market. The MAX4999 is designed for USB 2.0 low-/full-/Hi-Speed applications with capability of supporting data rates up to 480Mbps.

The MAX4999 is a differential 8:1 multiplexer. The MAX4999 features three digital inputs to control the signal path. Typical applications include switching a USB connector between eight USB hosts and a USB device.

An enable input (EN) is provided to disable all channels and place the device into a high-impedance state (standby mode), shutting off the charge pump for minimum power consumption.

The MAX4999 operates from a +3.0V to +3.6V power-supply voltage and is specified over the -40°C to +85°C extended temperature range. The MAX4999 is available in a 5mm x 5mm, 32-pin TQFN package.
MAX4999: Functional Diagram MAX4999: Functional Diagram Enlarge+

Key Features

  • Increased Flexibility and Performance
    • Multiplexer Supports USB 2.0 Standard
    • -3dB Bandwidth: 1200MHz (typ)
  • Low On-Resistance and Power Management Features Minimize System Losses
    • 6.5Ω (typ) On-Resistance (RON)
    • Single +3.0V to +3.6V Power-Supply Voltage
    • Enable Input Puts All Channels in High-Impedance State (Standby Mode)
    • Low Operating Current (1µA) and Ultra-Low Quiescent Current (30nA) in Standby Mode
  • Reduce Component Count and Design Complexity
    • Low Threshold Eliminates the Need for Translators in 1.8V Low-Voltage Systems
  • Saves Board Space
    • 32-Pin, 5mm x 5mm, TQFN Package


  • Keyboard, Video, Mouse (KVM)
  • Mass Storage
  • Servers/RAID
  • Workstations
Part Number Protocol Config. Channels VSUPPLY (Single)
VSUPPLY (Single)
Dynamic Range (max)
Package/Pins Budgetary
min max min max max max max min See Notes
USB Full-Speed
USB High-Speed
USB Low-Speed
8-to-1 2 3 3.6 0 3.6 3.6 12 1200 1000 10000 6 5
$2.63 @1k
See All Switches and Multiplexers (Low Voltage) (169)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

App Note 5299 Selecting the Right CMOS Analog Switch
App Note 4372 Implementing an Eight-to-One USB Switch for KVM Applications

Quality and Environmental Data

Product Reliability Reports: MAX4999.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Related Resources

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  • Integrated Protection for System Reliability