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MAX14984

Description
Enhanced VGA Port Protector with Monitor Detection and Dual USB Power Switches
File Size949KB,12 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX14984 Overview

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

19-6229; Rev 0; 3/12
EVALUATION KIT AVAILABLE
MAX14984
Enhanced VGA Port Protector with Monitor
Detection and Dual USB Power Switches
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
V
CC
, 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 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.
Benefits and Features
S
Design Flexibility
Graphics Controller Port Is Protected when
V
CC
= 0V
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
2.1ns (typ) t
R
/t
F
with 10pF, 2.2kI Load on
Monitor-Side SYNC Signals
Source and Sink 8mA While Meeting Speed
Requirements
High-ESD Protection on VGA and USB Outputs
Q8kV
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
Typical Operating Circuit
+3.3V
1µF
3
2
GRAPHICS
CONTROLLER
2
2
3
2
2
VGA
PORT
+5V
Applications
Servers
Workstations
Desktop PCs
R0, G0, B0
HSYNC0,
VSYNC0
SCL0, SDA0
F1, F2
ENU
V
CC
R1, G1, B1
HSYNC1,
VSYNC1
SCL1, SDA1
S5V
Ordering Information
appears at end of data sheet.
1µF
+3.3V
For related parts and recommended products to use with this part,
refer to
www.maxim-ic.com/MAX14984.related.
MD
MAX14984
USB1
1µF
USB
DEVICE
USB2
ENV
GND
1µF
USB
DEVICE
½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½½
Maxim Integrated Products
1
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.

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