MAX4998ETI+T - Hytronics - Datasheet.Directory

_______________________________________________________________ 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.

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

MAX4998/MAX14998

19-5033; Rev 1; 8/10

Typical Operating Circuit appears at end of data sheet.

General Description

The MAX4998/MAX14998 high-speed passive switches

route DisplayPort™ between two possible destinations

or vice versa in laptops or desktop PCs. The MAX4998/

MAX14998 are intended to be used where ultra-high-

speed performance and minimal input capacitance is

required.

The MAX4998 has three double-pole/double-throw

(DPDT) switches and one single-pole/double-throw

(SPDT) switch. Two DPDT switches are for high-frequen-

cy switching, one DPDT switch is for AUX, and the one

SPDT switch is for HPD. The two high-frequency switches

are selected by SEL1, and the AUX and HPD are selected

by SEL2. This part is suitable for two-lane DisplayPort

switching.

The MAX14998 has six double-pole/double-throw (DPDT)

switches. Four DPDT switches are for high-frequency

switching, and two DPDT switches are for AUX and HPD.

The four high-frequency switches are selected by SEL1,

and the AUX and HPD are selected by SEL2. This part is

suitable for four-lane DisplayPort switching.

The MAX4998/MAX14998 are fully specified to operate

from a single +3.3V (typ) power supply. The MAX4998

is available in a 3.5mm x 5.5mm, 28-pin TQFN package

with exposed pad, and the MAX14998 is available in a

3.5mm x 9mm, 42-pin TQFN package with exposed pad.

Both devices operate over the -40NC to +85NC extended

temperature range.

Applications

Notebook PCs

Desktop PCs

Features

S Single 3.3V Power-Supply Voltage

S 8.5GHz (typ) Bandwidth

S Support 1.6/5.4Gbps DisplayPort Signals

Handles DisplayPort v1.1 Signals

Handles DisplayPort v1.2 Signals

S Excellent Return Loss -13dB at 2.7GHz

S Independent High Frequency: AUX Select

S Designed for AC-Coupled Circuits

S Pass Throughs Are Maintained

S Low 850µA (max) Supply Current

S Small Packages

3.5mm x 5.5mm, 28-Pin TQFN Package with

Exposed Pad

3.5mm x 9mm, 42-Pin TQFN Package with

Exposed Pad

S Flow-Through Layout for Easy Board Layout

S ESD Protection for All I/O Pins: Human Body

Model (HBM) Q4kV

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

*EP = Exposed pad.

DisplayPort is a trademark of Video Electronics Standards

Association (VESA).

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX4998ETI+T -40NC to +85NC28 TQFN-EP*

MAX14998ETO+T -40NC to +85NC42 TQFN-EP*

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

MAX4998/MAX14998

2 ______________________________________________________________________________________

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.

(All voltages referenced to GND, unless otherwise noted.)

VDD ..........................................................................-0.3V to +4V

SEL1, SEL2, COM_, NO_, NC_ (Note 1) .....-0.3V to +(VDD + 0.3)V

|VCOM_ - VNO_|, |VCOM_ - VNC_| (Note 1) ..................... 0 to +2V

Continuous Current (COM_ to NO_/NC_) ....................... Q70mA

Peak Current (COM_ to NO_/NC_)

(pulsed at 1ms, 10% duty cycle) ................................. Q70mA

Continuous Current (SEL1, SEL2) ................................... Q30mA

Peak Current (SEL1, SEL2)

(pulsed at 1ms, 10% duty cycle) ................................. Q70mA

Continuous Power Dissipation (TA = +70NC)

28-Pin TQFN (derate 28.6mW/NC above +70NC) .......2285mW

42-Pin TQFN (derate 34.5mW/NC above +70NC) .......2758mW

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

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

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

Package Junction-to-Ambient Thermal Resistance (BJA) (Note 2)

28-Pin TQFN .................................................................35NC/W

42-Pin TQFN .................................................................29NC/W

Package Junction-to-Case Thermal Resistance (BJC) (Note 2)

28-Pin TQFN ................................................................2.7NC/W

42-Pin TQFN ...................................................................2NC/W

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

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

ELECTRICAL CHARACTERISTICS

(VDD = +3.3V Q10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +3.3V, TA = +25NC, unless otherwise

noted.) (Note 3)

ABSOLUTE MAXIMUM RATINGS

Note 1: Signals on COM_, NO_, NC_, SEL1, and SEL2 exceeding VDD or GND are clamped by internal diodes. Limit forward-

diode current to the maximum current rating.

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.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ANALOG SWITCH

Analog Signal Range VCOM_, VNO_,

VNC_

(VDD -

1.8) V

Voltage Between COM_ and

NO_/NC_

|VCOM_ - VNO_|,

|VCOM_ - VNC_|0 1.8 V

On-Resistance RON ICOM_ = 15mA;

VNO_, VNC_ = 0V, +1.2V 7I

On-Resistance Match

Between Pairs of Same

Channel

DRON VDD = +3.0V; ICOM_ = 15mA; VNO_,

VNC_ = 0V (Notes 4, 5) 0.1 2 I

On-Resistance Match

Between Channels DRON VDD = +3.0V; ICOM_ = 15mA; VNO_,

VNC_ = 0V (Notes 4, 5) 1.0 4 I

On-Resistance Flatness RFLAT(ON) VDD = +3.0V; ICOM_ = 15mA; VNO_,

VNC_ = 0V, +1.2V (Notes 5, 6) 0.3 1.5 I

NO_ or NC_ Off-Leakage

Current

INO_(OFF)

INC_(OFF)

VDD = +3.6V; VCOM_ = 0V, +1.2V;

VNO_ or VNC_ = +1.2V, 0V -1 1 FA

COM_ On-Leakage

Current ICOM_(ON) VDD = +3.6V; VCOM_ = 0V, +1.2V;

VNO_ or VNC_ = VCOM_ or unconnected -1 1 FA

DIGITAL SIGNALS

SEL1 and SEL2 to Switch

Turn-On Time tON_SEL VNO_ or VNC_ = +1.0V, RL = 50I,

CL = 100pF (Figure 1) 45 120 ns

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

MAX4998/MAX14998

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +3.3V Q10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +3.3V, TA = +25NC, unless otherwise

noted.) (Note 3)

Note 3: All units are 100% production tested at TA = +85NC. Limits over the operating temperature range are guaranteed by

design and characterization and are not production tested.

Note 4: DRON = RON(MAX) - RON(MIN).

Note 5: Guaranteed by design. Not production tested.

Note 6: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the

specified analog signal range.

Test Circuits/Timing Diagrams

Figure 1. Switching Time

tr < 5ns

tf < 5ns

50%

VIL

LOGIC

INPUT

SEL

COM_

GND

SEL_

CL INCLUDES FIXTURE AND STRAY CAPACITANCE.

VN_

VIH

NO_ OR NC_

0.9 x VOUT

tON_SEL

tOFF_SEL

VOUT

SWITCH

OUTPUT

COM_

SWITCH

OUTPUT

COM_

LOGIC

INPUT

SEL_

VDD

+3.3V

VOUT

tON_SEL

tOFF_SEL

MAX4998/MAX14998

VOUT = VN_ RL

RL + RON

( )

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SEL1 and SEL2 to Switch

Turn-Off Time tOFF_SEL VNO_ or VNC_ = +1.0V, RL = 50I,

CL = 100pF (Figure 1) 5 50 ns

Differential Insertion Loss SDD21 f = 0.8GHz (Figure 2) -0.67 dB

f = 1.35GHz (Figure 2) -0.95

Differential Crosstalk SDDCTK f = 0.8GHz (Figure 2) -37 dB

f = 1.35GHz (Figure 2) -34

Differential Return Loss SDD11 f = 0.8GHz (Figure 2) -20 dB

f = 1.35GHz (Figure 2) -14

Signal Data Rate BR RS = RL = 100I balanced 17 Gbps

Differential -3dB Bandwidth f-3BW RS = RL = 100I balanced 8.5 GHz

Differential Off-Isolation SDD21_OFF f = 1.35GHz (Figure 2) -28 dB

LOGIC INPUT (SEL1, SEL2)

Input Logic-High VIH 1.4 V

Input Logic-Low VIL 0.5 V

Input Logic Hysteresis VHYST 100 mV

Input Leakage Current IIN VSEL_ = 0V or VDD -1 +1 FA

POWER SUPPLY

Power-Supply Range VDD 3.0 3.6 V

VDD Supply Current IDD VSEL_ = 0V or VDD 500 850 FA

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

MAX4998/MAX14998

4 ______________________________________________________________________________________

Test Circuits/Timing Diagrams (continued)

Figure 2. Differential On-Loss, Differential Off-Isolation, and Differential Crosstalk

COM_+

COM_-

VDD

+3.3V

NC_+

NC_-

SEL1

GND

DIFFERENTIAL INSERTION LOSS/DIFFERENTIAL RETURN LOSS

PORT 1

PORT 2

PORT 3

PORT 4

NETWORK

ANALYZER

0.1µF

VIN+

VIN-

VOUT+

VOUT-

NO_+

NO_-

SEL20V

DIFFERENTIAL INSERTION LOSS = 20log( )

VOUT+ - VOUT-

VIN+ - VIN-

50Ω

MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS.

DIFFERENTIAL OFF-ISOLATION IS MEASURED BETWEEN COM_ AND “OFF” NO_ OR NC_ TERMINAL ON EACH SWITCH.

DIFFERENTIAL ON-LOSS IS MEASURED BETWEEN COM_ AND “ON” NO_ OR NC_ TERMINAL ON EACH SWITCH.

DIFFERENTIAL CROSSTALK IS MEASURED BETWEEN ANY TWO PAIRS.

MAX4998

MAX14998

COM_+

COM_-

VDD

+3.3V

NC_+

NC_-

SEL1

GND

DIFFERENTIAL OFF-ISOLATION

PORT 1

PORT 2

PORT 3

PORT 4

NETWORK

ANALYZER

0.1µF

VIN+

VIN-

VOUT+

VOUT-

NO_+

NO_-

SEL2VDD

VDD

DIFFERENTIAL OFF-ISOLATION = 20log( )

VOUT+ - VOUT-

VIN+ - VIN-

50Ω

MAX4998

MAX14998

COM_+

COM_-

VDD

+3.3V

NO_+/NC_+

NO_-/NC_-

SEL1

GND

DIFFERENTIAL CROSSTALK

PORT 1

PORT 2

PORT 3

PORT 4

NETWORK

ANALYZER

0.1µF

VIN+

VIN-

VOUT+

VOUT-

NO_+/NC_+

NO_-/NC_-

SEL20V OR VDD

0V OR VDD

DIFFERENTIAL CROSSTALK = 20log( )

VOUT+ - VOUT-

VIN+ - VIN-

50Ω

COM_+

COM_-

50Ω

MAX4998

MAX14998

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

MAX4998/MAX14998

_______________________________________________________________________________________ 5

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

DIFFERENTIAL RETURN LOSS

MAX4998/MAX14998 toc09

FREQUENCY (MHz)

DIFFERENTIAL RETURN LOSS (dB)

1000100

-35

-30

-25

-20

-15

-10

-5

-40

10 10,000

DIFFERENTIAL CROSSTALK

MAX4998/MAX14998 toc08

FREQUENCY (MHz)

DIFFERENTIAL CROSSTALK (dB)

1000100

-70

-60

-50

-40

-30

-20

-10

-80

10 10,000

DIFFERENTIAL OFF-ISOLATION

MAX4998/MAX14998 toc07

FREQUENCY (MHz)

DIFFERENTIAL OFF-ISOLATION (dB)

1000100

-70

-60

-50

-40

-30

-20

-10

-80

10 10,000

DIFFERENTIAL INSERTION LOSS

MAX4998/MAX14998 toc06

FREQUENCY (MHz)

DIFFERENTIAL INSERTION LOSS (dB)

1000100

-9

-8

-7

-6

-5

-4

-3

-2

-1

-10

10 10,000

TURN-ON/OFF TIME vs. SUPPLY VOLTAGE

MAX4998/MAX14998 toc05

SUPPLY VOLTAGE (V)

TURN-ON/OFF TIME (ns)

3.53.43.33.23.1

3.0 3.6

tON_SEL

tOFF_SEL

LOGIC THRESHOLD vs. SUPPLY VOLTAGE

MAX4998/MAX14998 toc04

SUPPLY VOLTAGE (V)

LOGIC THRESHOLD (V)

3.53.43.33.23.1

0.7

0.9

1.1

1.3

1.5

0.5

3.0 3.6

VDD = 3.3V

VIH

VIL

SUPPLY CURRENT vs. TEMPERATURE

MAX4998/MAX14998 toc03

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

6035-15 10

100

200

300

400

600

500

700

800

-40 85

VDD = 3.3V

ON-RESISTANCE vs. COM_ VOLTAGE

MAX4998/MAX14998 toc02

VCOM_ (V)

ON-RESISTANCE (Ω)

1.31.10.90.70.50.30.1

-0.1 1.5

VDD = 3.3V

ICOM_ = 15mA

TA = +85°C

TA = +25°C

TA = -40°C

ON-RESISTANCE vs. COM_ VOLTAGE

MAX4998/MAX14998 toc01

VCOM_ (V)

ON-RESISTANCE (Ω)

1.71.50.1 0.3 0.5 0.9 1.10.7 1.3

4.5

5.0

5.5

6.0

6.5

7.0

7.5

8.0

4.0

-0.1 1.9

VDD = 3.6V

ICOM_ = 15mA

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

MAX4998/MAX14998

6 ______________________________________________________________________________________

Pin Configurations

Pin Description

MAX4998 MAX14998

TOP VIEWS

TQFN

SEL2

NO3+

NO2-

NO2+

28 +

NC0+

NC0-

NC1+

*EP *EP

*CONNECT EXPOSED PAD TO GROUND.

NC1-

12345678910

24 23 22 21 20 19 18 17 16 15

SEL1

VDD

COM3+

VDD

COM2-

COM2+

COM1-

COM1+

COM0-

COM0+

VDD

NC3+

NC2-

NC2+

VDD

NO1-

NO1+

NO0-

NO0+

GND

TQFN

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22

COM4-

VDD

COM5+

COM5-

SEL1

SEL2

COM4+

COM3-

COM3+

COM2-

COM2+

VDD

COM1-

COM1+

COM0-

COM0+

VDD

NO5-

NO5+

NO4-

NO4+

NC0+

NC0-

NC1+

NC1-

NO3-

VDD

NC4+

NC4-

NC5+

NC5-

NO3+

NO2-

NO2+

NO1-

NO1+

NO0-

NO0+

NC3-

NC3+

NC2-

NC2+

PIN NAME FUNCTION

MAX4998 MAX14998

1 2 COM0+ Analog Switch 1. Common positive terminal.

2 3 COM0- Analog Switch 1. Common negative terminal.

3 4 COM1+ Analog Switch 2. Common positive terminal.

4 5 COM1- Analog Switch 2. Common negative terminal.

5 7 COM2+ Analog Switch 3. Common positive terminal.

6 8 COM2- Analog Switch 3. Common negative terminal.

7, 9, 15, 19 1, 6, 13, 26 VDD

Positive Supply Voltage Input. Connect VDD to a +3.0V to +3.6V supply voltage.

Bypass VDD to GND with a 0.1mF ceramic capacitor placed as close to the device as

possible (see the Board Layout section).

8 9 COM3+ Analog Switch 4. Common positive terminal.

10 16 SEL1 Control Signal Input. Selects high-frequency switching.

11 17 SEL2 Control Signal Input. Selects AUX/HPD.

12 28 NO3+ Analog Switch 4. Normally Open positive terminal.

13 29 NO2- Analog Switch 3. Normally Open negative terminal.

14 30 NO2+ Analog Switch 3. Normally Open positive terminal.

16 36 NC3+ Analog Switch 4. Normally Closed positive terminal.

17 37 NC2- Analog Switch 3. Normally Closed negative terminal.

18 38 NC2+ Analog Switch 3. Normally Closed positive terminal.

20 31 NO1- Analog Switch 2. Normally Open negative terminal.

21 32 NO1+ Analog Switch 2. Normally Open positive terminal.

22 33 NO0- Analog Switch 1. Normally Open negative terminal.

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

MAX4998/MAX14998

_______________________________________________________________________________________ 7

Detailed Description

The MAX4998/MAX14998 high-speed passive switches

route one DisplayPort source between two possible

destinations or vice versa. The MAX4998 is used to

switch two-lanes plus AUX/HPD DisplayPort, and the

MAX14998 is used to switch four-lanes plus AUX/HPD

DisplayPort.

The MAX4998/MAX14998 feature two digital control

inputs (SEL1, SEL2) to switch signal paths.

Digital Control Inputs (SEL1, SEL2)

The MAX4998/MAX14998 provide two digital control

inputs (SEL1, SEL2) to select the signal path between

the COM_ and NO_/NC_ channels. SEL1 selects high-

frequency switching, while SEL2 selects AUX/HPD. On

the MAX4998, switches 1 and 2 are high-frequency

switches and switches 3 and 4 are both low-frequency

switches. On the MAX14998, switches 1, 2, 3, and 4 are

high-frequency switches and switches 5 and 6 are low-

frequency switches. The truth tables for the MAX4998/

MAX14998 are depicted in the Functional Diagrams/

Truth Tables. Drive SEL_ 0V to VDD to minimize power

consumption.

Analog Signal Levels

The MAX4998/MAX14998 accept standard DisplayPort

signals to a maximum of (VDD - 1.8V). Signals on the

COM_+ channels are routed to either the NO_+ or NC_+

channels. Signals on the COM_- channels are routed

to either the NO_- or NC_- channels. The MAX4998/

MAX14998 are bidirectional switches, allowing COM_,

NO_, and NC_, to be used as either inputs or outputs.

Pin Description (continued)

PIN NAME FUNCTION

MAX4998 MAX14998

23 34 NO0+ Analog Switch 1. Normally Open positive terminal.

24 — GND Ground

25 39 NC1- Analog Switch 2. Normally Closed negative terminal.

26 40 NC1+ Analog Switch 2. Normally Closed positive terminal.

27 41 NC0- Analog Switch 1. Normally Closed negative terminal.

28 42 NC0+ Analog Switch 1. Normally Closed positive terminal.

— 10 COM3- Analog Switch 4. Common negative terminal.

— 11 COM4+ Analog Switch 5. Common positive terminal.

— 12 COM4- Analog Switch 5. Common negative terminal.

— 14 COM5+ Analog Switch 6. Common positive terminal.

— 15 COM5- Analog Switch 6. Common negative terminal.

— 18 NO5- Analog Switch 6. Normally Open negative terminal.

— 19 NO5+ Analog Switch 6. Normally Open positive terminal.

— 20 NO4- Analog Switch 5. Normally Open negative terminal.

— 21 NO4+ Analog Switch 5. Normally Open positive terminal.

— 22 NC5- Analog Switch 6. Normally Closed negative terminal.

— 23 NC5+ Analog Switch 6. Normally Closed positive terminal.

— 24 NC4- Analog Switch 5. Normally Closed negative terminal.

— 25 NC4+ Analog Switch 5. Normally Closed positive terminal.

— 27 NO3- Analog Switch 4. Normally Open negative terminal.

— 35 NC3- Analog Switch 4. Normally Closed negative terminal.

— — EP Exposed Pad. Internally connected to GND. Connect to a large plane to maximize

thermal performance. Not intended as an electrical part.

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

MAX4998/MAX14998

8 ______________________________________________________________________________________

Functional Diagrams/Truth Tables

SEL1 EVENT SWITCH

0 COM_ TO NC_ 1, 2, 3, 4

1 COM_ TO NO_ 1, 2, 3, 4

SEL2 EVENT SWITCH

0 COM_ TO NC_ 5, 6

1 COM_ TO NO_ 5, 6

MAX14998

GND

NO0+

NO0-

COM0+

SEL1

COM0-

NC0+

NC0-

NO1+

NO1-

COM1+

COM1-

NC1+

NC1-

NO2+

NO2-

COM2+

COM2-

NC2+

NC2-

NO3+

NO3-

COM3+

COM3-

NC3+

NC3-

NO4+

NO4-

COM4+

COM4-

NC4+

NC4-

NO5+

NO5-

COM5+

COM5-

NC5+

NC5-

SEL2

VDD

SEL1 EVENT SWITCH

0 COM_ TO NC_ 1, 2

1 COM_ TO NO_ 1, 2

SEL2 EVENT SWITCH

0 COM_ TO NC_ 3, 4

1 COM_ TO NO_ 3, 4

MAX4998

GND

SEL1

NO0+

NO0-

COM0+

COM0-

NC0+

NC0-

NO1+

NO1-

COM1+

COM1-

NC1+

NC1-

NO2+

NO2-

COM2+

COM2-

NC2+

NC2-

COM3+ NC3+

NO3+

SEL2

VDD

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

MAX4998/MAX14998

_______________________________________________________________________________________ 9

Typical Operating Circuit

VDD = +3.3V

NO0+

NO0-

COM0+

COM0-

COM1+

COM1-

COM2+

COM2-

NO1+

NO1-

NO2+

NO2-

NO3+

+1.1V

OF THE 7WZ07

GRAPHICS AND MEMORY

CONTROLLER HUB

DP0

DP1

AUX

COM3+HPD

SEL1

SEL2CHANNEL SELECT

CHANNEL SELECT

DOCKING STATION

DP01

DP11

AUX1

NC0+

NC0-

NC1+

NC1-

NC2+

NC2-

DisplayPort

CONNECTOR

DP02

DP12

AUX2

HPD1

MAX4998

VCC = +1.1V

7WZ07 DUAL-GATE LOTIC OPERATES FROM +3.3V VCC

+1.1V

10kΩ

NC3+ HPD2

10kΩ

NOTE: THE APPLICATION SHOWN IS A TWO-LANE SWITCH BETWEEN THE DOCKING STATION AND DisplayPort CONNECTOR ON A LAPTOP. SEL2 NEEDS TO BE CHANGED FIRST

WHEN SWITCHING SO THAT THE AUX/HPD SIGNAL CAN ESTABLISH CONTACT AND SET PARAMETERS THROUGH DDC. THE HPD SIGNALS FROM THE DOCKING STATION AND DP

CONNECTOR NEED TO BE INPUT THROUGH A LEVEL TRANSLATOR, SUCH AS A 7WZ07 OR 742G07 NONINVERTING TO THE MAX4998. EACH OUTPUT IS PULLED UP TO MATCH THE

LOGIC LEVEL OF THE GMCH. THE COM SIDE OF THE MAX4998 NEEDS TO BE CONNECTED DIRECTLY TO THE GMCH, RUNNING AT LOW VOLTAGE (APPROXIMATELY 1.1V). THIS

ESTABLISHES THE COMMON-MODE VOLTAGE FOR THE SWITCH AND KEEPS THE SWITCH WITHIN ITS OPTIMAL RANGE. IF A FOUR-LANE DisplayPort SWITCH IS DESIRED, THE

MAX14998 SHOULD BE USED. THE CIRCUIT IS THE SAME EXCEPT THAT DP0 TO DP3 IS USED WITH AUX, AND THE HPD CIRCUITRY IS THE SAME.

OF THE 7WZ07

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

MAX4998/MAX14998

10 _____________________________________________________________________________________

Applications Information

Board Layout

High-speed switches require proper layout and design

procedures for optimum performance. Keep design-

controlled impedance PCB traces as short as possible.

Ensure that power-supply bypass capacitors are placed

as close to the device as possible. Multiple bypass

capacitors are recommended. Connect all grounds and

the exposed pad to large ground planes.

Chip Information

PROCESS: CMOS

Package Information

For the latest package outline information and land patterns,

go to www.maxim-ic.com/packages. Note that a “+”, “#”, or

“-” in the package code indicates RoHS status only. Package

drawings may show a different suffix character, but the drawing

pertains to the package regardless of RoHS status.

PACKAGE

TYPE

PACKAGE

CODE

OUTLINE

NO.

LAND

PATTERN NO.

28 TQFN-EP T283555+1 21-0184 90-0123

42 TQFN-EP T423590+1 21-0181 90-0078

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

MAX4998/MAX14998

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.

Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 11

Revision History

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 10/09 Initial release —

1 8/10

Removed future status from the MAX14998 in the Ordering Information table;

changed the bandwidth to 8.5GHz (typ) in the Features section; changed

the return loss to -13dB at 2.7GHz in the Features section; added sub-bullets

describing the DisplayPort signals v1.1 and v1.2 to the Features section