MAX14984

Enhanced VGA Port Protector with Monitor

Detection and Dual USB Power Switches

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Typical Operating Circuit

19-6229; Rev 0; 3/12

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part,

refer to www.maxim-ic.com/MAX14984.related.

EVALUATION KIT AVAILABLE

General Description

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 sup-

plies 500mA of current with less than 250mV drop from

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 lev-

els to support +2.5V to +5.0V CMOS or TTL-compatible

graphics controllers while meeting the VESA drive capa-

bility requirement of Q8mA. 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 Q8kV

Human Body Model (HBM) on all VGA and USB out-

puts. The device is available in a 24-pin (4mm x 4mm)

TQFN package and is specified over the -40NC to +85NC

extended temperature range.

Applications

Servers

Workstations

Desktop PCs

Benefits and Features

S

Design Flexibility



Graphics Controller Port Is Protected when



External Pullup Resistors Match DDC Channel

to Graphics Controller Supply



Up to Two USB Ports Supported

S

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



Monitor-Side SYNC Signals



Source and Sink 8mA While Meeting Speed

Requirements



High-ESD Protection on VGA and USB Outputs

Q

8kV Human Body Model (HBM)

S

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

R0, G0, B0

HSYNC0,

VSYNC0

SCL0, SDA0

F1, F2

MD

ENV

ENU

GRAPHICS

CONTROLLER

+3.3V

+5V

3

2

2

2

+3.3V

GND

R1, G1, B1

HSYNC1,

VSYNC1

SCL1, SDA1

1µF

1µF

S5V

USB1

VGA

PORT

3

2

2

1µF

USB

DEVICE

USB2

1µF

USB

DEVICE

MAX14984

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.