MAX14984 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 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.
Applications
Servers
Workstations
Desktop PCs
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.
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
GRAPHICS
CONTROLLER
+5V
1µF
3
2
2
2
+3.3V
R0, G0, B0 ^VCC R1, G1, B1
HSYNC0,
VSYNC0
HSYNC1,
VSYNC1
SCL0, SDA0 SCL1, SDA1
F1, F2
S5V
ENU
MAX14984
USB1
MD
USB2
ENV
GND
3
2
VGA
2
PORT
1µF
USB
DEVICE
1µF
USB
DEVICE
1µF
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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.