MAX14984
Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches
Seamlessly Switch Between Monitors While Powering USB Ports
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Overview
Features and Benefits
- 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
- Internal USB Switches
Product Details
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.Applications
- Desktop PCs
- Servers
- Workstations
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
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