Rainbow Electronics MAX14998 User Manual

19-5033; Rev 0; 10/09

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

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-high­speed 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-frequen­cy 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 5GHz Bandwidth

S Support 1.6/2.7Gbps DisplayPort Signals

S Excellent Return Loss -14dB at 1.35GHz

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

PART TEMP RANGE PIN-PACKAGE

MAX4998ETI+T
MAX14998ETO+T*

+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*Future Product. Contact factory for availability.
**EP = Exposed Pad.

Typical Operating Circuit appears at end of data sheet.

-40NC to +85NC

-40NC to +85NC

28 TQFN-EP**
42 TQFN-EP**

MAX4998/MAX14998

DisplayPort is a trademark of Video Electronics Standards
Association (VESA).

_______________________________________________________________ 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

ABSOLUTE MAXIMUM RATINGS

(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

|V

COM_

- V

NO_|, |VCOM_

- V

| (Note 1) .....................0 to +2V

NC_

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

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

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

MAX4998/MAX14998

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.

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

ELECTRICAL CHARACTERISTICS

(VDD = +3.3V Q10%, TA = T
noted.) (Note 3)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ANALOG SWITCH

Analog Signal Range

Voltage Between COM_ and
NO_/NC_

On-Resistance R

On-Resistance Match
Between Pairs of Same
Channel

On-Resistance Match
Between Channels

On-Resistance Flatness R

NO_ or NC_ Off-Leakage
Current

COM_ On-Leakage
Current

DIGITAL SIGNALS

SEL1 and SEL2 to Switch
Turn-On Time

MIN

to T

|V

unless otherwise noted. Typical values are at VDD = +3.3V, TA = +25NC, unless otherwise

MAX,

V

, V

NC_

- V

- V

ON

ON

ON

NO_

NO_|,

NC_

,

COM_

COM_

|V

COM_

DR

DR

FLAT(ON)

I

NO_(OFF)

I

NC_(OFF)

I

COM_(ON)

t

ON_SEL

V

|

I

= 15mA;

COM_

V

NO_, VNC_

= 0V, +1.2V

VDD = +3.0V; I
V

= 0V (Notes 4, 5)

NC_

VDD = +3.0V; I
V

= 0V (Notes 4, 5)

NC_

VDD = +3.0V; I
V

= 0V, +1.2V (Notes 5, 6)

NC_

VDD = +3.6V; V
V

or V

NO_

NC_

VDD = +3.6V; V
V

or V

V

NO_

NO_

or V

NC_

NC_

CL = 100pF (Figure 1)

= 15mA; V

COM_

= 15mA; V

COM_

= 15mA; V

COM_

= 0V, +1.2V;

COM_

= +1.2V, 0V

= 0V, +1.2V;

COM_

= V

or unconnected

COM_

= +1.0V, RL = 50I,

NO_,

NO_,

NO_,

(VDD -

1.8)

0 1.8 V

7

0.1 2

1.0 4

0.3 1.5

-1 1

-1 1

45 120 ns

V

I

I

I

I

FA

FA

2 ______________________________________________________________________________________

Two-Lane and Four-Lane DisplayPort Passive

Switches with Separate AUX/HPD Control

ELECTRICAL CHARACTERISTICS (continued)

(VDD = +3.3V Q10%, TA = T
noted.) (Note 3)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SEL1 and SEL2 to Switch
Turn-Off Time

Differential Insertion Loss S

Differential Crosstalk S

Differential Return Loss S

Signal Data Rate BR
Differential -3dB Bandwidth f
Differential Off-Isolation S

LOGIC INPUT (SEL1, SEL2)

Input Logic-High V
Input Logic-Low V
Input Logic Hysteresis V
Input Leakage Current I

POWER SUPPLY

Power-Supply Range V
VDD Supply Current I

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 = R

ON(MAX)

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.

MIN

- R

to T

MAX,

ON(MIN)

unless otherwise noted. Typical values are at VDD = +3.3V, TA = +25NC, unless otherwise

t

OFF_SEL

DD21

DDCTK

DD11

-3BW

DD21_OFF

IH

IL

HYST

IN

DD

DD

or V

NO_

CL = 100pF (Figure 1)

f = 0.8GHz (Figure 2) -0.67
f = 1.35GHz (Figure 2) -0.95
f = 0.8GHz (Figure 2) -37
f = 1.35GHz (Figure 2) -34
f = 0.8GHz (Figure 2) -20
f = 1.35GHz (Figure 2) -14
RS = RL = 100I balanced
RS = RL = 100I balanced
f = 1.35GHz (Figure 2) -28 dB

V

= 0V or V

SEL_

V

= 0V or V

SEL_

= +1.0V, RL = 50I,

NC_

DD

DD

5 50 ns

17 Gbps

8.5 GHz

1.4 V

0.5 V

100 mV

-1 +1

3.0 3.6 V
500 850

V

.

dB

dB

dB

FA

FA

MAX4998/MAX14998

Test Circuits/Timing Diagrams

tr < 5ns
t

< 5ns

f

0.9 x V

0.9 x V

t

OFF _SEL

OUT

t

ON_ SEL

OUT

NO_ OR NC_

V

N_

SEL_

LOGIC

INPUT

SEL

C

INCLUDES FIXTURE AND STRAY CAPACITANCE.

L

V

OUT

Figure 1. Switching Time

_______________________________________________________________________________________ 3

MAX4998/MAX14998

GND

R

N_

( )

RL + R

L

ON

= V

+3.3V

V

DD

COM_

V

INPUT

SEL_

IH

V

IL

0V

0V

V

50%

OUT

0.9 x V

0.9 x V

OUT

t

ON_ SEL

t

OFF _SEL

OUT

LOGIC

V

OUT

R

L

C

L

SWITCH
OUTPUT

COM_

SWITCH
OUTPUT

COM_