MAXIM MAX14984 Technical data

EVALUATION KIT AVAILABLE

19-6229; Rev 0; 3/12

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 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 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 outputs. 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 VCC = 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) tR/tF 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 +5V

1µF

S5V

1µF

USB1

1µF

USB2

1µF

GRAPHICS

CONTROLLER

+3.3V

R0, G0, B0

HSYNC0, VSYNC0

SCL0, SDA0

F1, F2

ENU

MAX14984

ENV

GND

R1, G1, B1

HSYNC1,

VSYNC1

SCL1, SDA1

VGA

PORT

USB

DEVICE

USB

DEVICE

�� 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.

MAX14984

Enhanced VGA Port Protector with Monitor

Detection and Dual USB Power Switches

ABSOLUTE MAXIMUM RATINGS

(All voltages referenced to GND.) VCC, S5V, H0, V0, SDA0, SCL0, ENU, ENV, SDA1,

SCL1, USB1, USB2, MD, F1, F2 (Note 1) ...........-0.3V to +6V

R0, G0, B0, R1, G1, B1, H1, V1 .................. -0.3V to VCC + 0.3V

Continuous Current Out of USB1, USB2 ..........................500mA

Continuous Current Out of S5V ..........................................60mA

Continuous Current Through all I/O Pins ........................ Q50mA

Peak Current Through RGB, DDC Switches

(1ms Pulse, 10% Duty Cycle) .................................... Q100mA

PACKAGE THERMAL CHARACTERISTICS (Note 2)

TQFN

Junction-to-Ambient Thermal Resistance (qJA) ..........36°C/W Junction-to-Case Resistance (qJA) ...................................3°C/W

Note 1: When F1 and F2 are connected to a voltage higher than VCC, some current will be sinked (see the Detailed Description). Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(VCC = 5.0V Q 5%, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 5.0V and TA = +25NC.) (Note 3)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT

POWER SUPPLY

Supply Voltage V

Supply Current I

Shutdown Supply Current I

5-VOLT SWITCH (S5V)

Voltage Drop V

Reverse Leakage Current I

Current Limit I

USB SWITCHES (USB1, USB2)

Voltage Drop V

Continuous Load Current I

Current-Limit Threshold I

Current-Limit Blanking Period

Output Rise Time t

Output Fall Time t

Turn-On Delay t

Turn-Off Delay t

Reverse Leakage Current I Pulldown Resistance 1200

SHDN

S5V

LIM

USB

LOAD

LIM

BLANK

OFF

LUSB

VCC = +5.25V, V SDA0 not connected

VCC = +5.25V, V V

= V

SCL0

VCC = +5.25V, V

= 55mA 135 300 mV

OUT

= +5.25V, VCC = 0V, V

S5V

= 500mA 250 mV

OUT

(Note 4) 7.5 50 ms

RL = 10I, CL = 1FF, 10%–90%, Figure 1

RL = 10I, CL = 1FF, 90%–10%, Figure 1

RL = 10I, CL = 1FF, to 10% of V

RL = 10I, CL = 1FF, to 90% of V

= 5.25V, VCC = 0V, V

USB

SDA0

= 0V

Continuous Power Dissipation (TA = +70C)

TQFN (derate 27.8mW/NC above +70C) ................2222.2mW

Operating Temperature Range .......................... -40NC to +85NC

Junction Temperature .....................................................+150NC

Storage Temperature Range ............................ -65NC to +150NC

Lead Temperature (soldering, 10s) ................................+300NC

Soldering Temperature (reflow) ......................................+260NC

4.75 5.25 V

ENV

= V

= 0V, SCL0 and

ENU

= 0V,

ENU

= V

ENU

ENV

ENU

= 0V

OUT

= 0V

, Figure 1

2.3 5

6.6 10

29 100

55 305 500 mA

500 mA

0.5 1.0 A

11.6

25.2

100

�� Maxim Integrated Products 2

MAX14984

Enhanced VGA Port Protector with Monitor

Detection and Dual USB Power Switches

ELECTRICAL CHARACTERISTICS (continued)

(VCC = 5.0V Q 5%, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 5.0V and TA = +25NC.) (Note 3)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT

DDC SWITCHES (SDA0, SCL0, SDA1, SCL1)

SDA1/SCL1 Off-Leakage Current

SDA0/SCL0 Off-Leakage Current

On-Resistance R

LOGIC INPUTS (H0, V0, ENV, ENU)

Input Logic-Low V

Input Logic-High V

Input Leakage Current I

Input Hysteresis (H0, V0) V

PUSH-PULL LOGIC OUTPUTS (H1, V1)

Output Logic-Low V

Output Logic-High V

Rise/Fall Time tR, t

OPEN-DRAIN LOGIC OUTPUTS (F1, F2, MD)

Output Leakage Current I

Output Logic-Low V

RGB ANALOG SWITCHES (R0, G0, B0, R1, G1, B1)

Bandwidth f

On-Loss I

On-Resistance R

On-Resistance Matching

On-Resistance Flatness R

On-Capacitance C

Off-Capacitance C

PROTECTION SPECIFICATIONS

High-ESD Pins ESD Protection

All Other Pins ESD Protection

Thermal-Shutdown Threshold

Thermal-Shutdown Hysteresis

Note 3: All units are production tested at TA = +25NC. Specifications over temperature are guaranteed by design. Note 4: t Note 5: See the Pin Description section for the ESD status of each pin. Note 6: Terminal tested vs. GND. Apply 1FF-bypass capacitors on VCC, USB1, USB2, and S5V.

is the period between detecting an overcurrent condition and the fault output asserting.

BLANK

�� Maxim Integrated Products 3

OFF

LDDC

ONDDC

HYST

LKG

MAX

LOSS

FLAT(ON)

OFF

SHDN

SHDN_

HYS

= VCC, V

ENV

VCC = 0V, 3.3kI pullup to +3.3V on SDA0 and SCL0

VIN = +0.8V, IIN = Q10mA

VIN = 0V or 5.25V -1 +1

= 8mA, VCC = +4.75V 0.5 V

SINK

SOURCE

10% to 90%, RL = 2.2kI, CL = 10pF

Output not asserted, VIN = 5.25V 1

SINK

RS = RL = 50I

f = 50MHz, RS = RL = 50I, 0V P VIN P +0.7V,

Figure 2

VIN = +0.7V, IIN = Q10mA

0V P VIN P +0.7V, IIN = Q10mA, same device

0V P VIN P +0.7V, IIN = Q10mA

f = 1MHz, switches enabled 6 pF

f = 1MHz, switches disabled 2 pF

Human Body Model (Note 5)

Human Body Model (Note 6)

= 8mA, VCC = +4.75V 2.4 V

= 1mA 0.3 V

SDA1

= V

= 0V or 5.25V

SCL1

-1 +1

0.8 V

2.0 V

100 mV

2.1 ns

1000 MHz

0.4 dB

5 8

0.25 1

+155

MAX14984

Enhanced VGA Port Protector with Monitor

Detection and Dual USB Power Switches

Test Circuits/Timing Diagrams

3.3V

ENU

OFF

USB1,

USB2

Figure 1. Timing Diagram for USB Switch Parameters

+5V

1µF

ENV

R0, G0, B0

MAX14984

R1, G1, B1

GND

90% 90%

10% 10%

NETWORK ANALYZER

OUT

50I

MEAS REF

50I 50I

50I

ON-LOSS = 20log

OUT

MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. ON-LOSS IS MEASURED BETWEEN R0 AND R1 ON EACH SWITCH. SIGNAL DIRECTION THROUGH IS REVERSED; WORST VALUES ARE RECORDED.

Figure 2. On-Loss

�� Maxim Integrated Products 4

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