Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches

Seamlessly Switch Between Monitors While Powering USB Ports


The MAX14984 is a complete VGA port protector with dual USB power switches. The device features all the circuitry required to detect the insertion and removal of a monitor and automatically connect the graphics controller when a monitor is detected. A switched 5V output provides up to 55mA to the VGA port in addition to normal VGA signals.

The MAX14984 features a single active-low enable input to control two 5V USB switches. Each switch supplies 500mA of current with less than 250mV drop from VCC, and is protected against short-circuit faults. Two active-low fault outputs indicate when a fault condition is detected on either output.

High-bandwidth analog switches exceed VESA rise/fall time requirements for the RGB channels. The horizontal and vertical synchronization (H/V) buffers shift logic levels to support +2.5V to +5.0V CMOS or TTL-compatible graphics controllers while meeting the VESA drive capability requirement of ±8mA. An internal 2.5V regulator and pullup resistors on the monitor side translate the DDC voltage levels to be compatible with low-voltage graphics controllers.

The MAX14984 features high-ESD protection of ±8kV Human Body Model (HBM) on all VGA and USB outputs. The device is available in a 24-pin (4mm x 4mm) TQFN package and is specified over the -40°C to +85°C extended temperature range.
MAX14984: Typical Operating Circuit MAX14984: Typical Operating Circuit Enlarge+

Key Features

  • Design Flexibility
    • Graphics Controller Port Is Protected when VCC = 0V
    • External Pullup Resistors Match DDC Channel to Graphics Controller Supply
    • Up to Two USB Ports Supported
  • High Level of Integration for Performance
    • S5V Provides +5V at 55mA to VGA Port
    • Internal Pullup Resistors on DDC Outputs to S5V
    • Low 6pF (typ) RGB Capacitance
    • 2.1ns (typ) tR/tF with 10pF, 2.2kΩ Load on Monitor-Side SYNC Signals
    • Source and Sink 8mA While Meeting Speed Requirements
    • High-ESD Protection on VGA and USB Outputs
      • ±8kV Human Body Model (HBM)
  • Saves Space on Board
    • Internal USB Switches
      • Pass +5V at 500mA with 250mV (max) IR Drop
      • Current Limited/Thermal Protection
    • 4mm x 4mm, 24-Pin TQFN Package


  • Desktop PCs
  • Servers
  • Workstations
Part Number Protocol Functions Channels VSUPPLY (Single)
VSUPPLY (Single)
min max max min max
MAX14984  VGA
1 4.5 5.75 8 1000 1000 1000 6 2
See All Switches and Multiplexers (Mid and High Voltage) (302)
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.

MAX14984EVKIT: Evaluation Kit for the MAX14984

Quality and Environmental Data

Request Reliability Report for: MAX14984 
Lead-Free Package Tin (Sn) Whisker Reports

Related Resources

Serial-Controlled 8:4 Matrix Switch Multiplexer

  • Flexible Architecture Enables Ease of Design and Control
  • Low Distortion Switching Improves System Performance
  • Integrated Protection for System Reliability