19-5033; Rev 1; 8/10
TION KIT
EVALUA BLE
AVAILA
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-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.
S
Single 3.3V Power-Supply Voltage
S
8.5GHz (typ) Bandwidth
S
Support 1.6/5.4Gbps DisplayPort Signals
Features
MAX4998/MAX14998
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
PART
MAX4998ETI+T
MAX14998ETO+T
TEMP RANGE
-40NC to +85NC
-40NC to +85NC
PIN-PACKAGE
28 TQFN-EP*
42 TQFN-EP*
Applications
Notebook PCs
Desktop PCs
+Denotes
a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*EP
= Exposed pad.
Typical Operating Circuit appears at end of data sheet.
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
MAX4998/MAX14998
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND, unless otherwise noted.)
V
DD
..........................................................................-0.3V to +4V
SEL1, SEL2, COM_, NO_, NC_ (Note 1).....-0.3V to +(V
DD
+ 0.3)V
|V
COM_
- V
NO_
|, |V
COM_
- V
NC_
| (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 (T
A
= +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 (B
JA
) (Note 2)
28-Pin TQFN.................................................................35NC/W
42-Pin TQFN.................................................................29NC/W
Package Junction-to-Case Thermal Resistance (B
JC
) (Note 2)
28-Pin TQFN................................................................2.7NC/W
42-Pin TQFN...................................................................2NC/W
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
Note 1:
Signals on COM_, NO_, NC_, SEL1, and SEL2 exceeding V
DD
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.
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
(V
DD
= +3.3V
Q10%,
T
A
= T
MIN
to T
MAX,
unless otherwise noted. Typical values are at V
DD
= +3.3V, T
A
= +25NC, unless otherwise
noted.) (Note 3)
PARAMETER
ANALOG SWITCH
Analog Signal Range
Voltage Between COM_ and
NO_/NC_
On-Resistance
On-Resistance Match
Between Pairs of Same
Channel
On-Resistance Match
Between Channels
On-Resistance Flatness
NO_ or NC_ Off-Leakage
Current
COM_ On-Leakage
Current
DIGITAL SIGNALS
SEL1 and SEL2 to Switch
Turn-On Time
2
t
ON_SEL
V
NO_
or V
NC_
= +1.0V, R
L
= 50I,
C
L
= 100pF (Figure 1)
45
120
ns
V
COM_
, V
NO_
,
V
NC_
|V
COM_
- V
NO_
|,
|V
COM_
- V
NC_
|
R
ON
I
COM_
= 15mA;
V
NO_
, V
NC_
= 0V, +1.2V
V
DD
= +3.0V; I
COM_
= 15mA; V
NO_
,
V
NC_
= 0V (Notes 4, 5)
V
DD
= +3.0V; I
COM_
= 15mA; V
NO_
,
V
NC_
= 0V (Notes 4, 5)
V
DD
= +3.0V; I
COM_
= 15mA; V
NO_
,
V
NC_
= 0V, +1.2V (Notes 5, 6)
V
DD
= +3.6V; V
COM_
= 0V, +1.2V;
V
NO_
or V
NC_
= +1.2V, 0V
V
DD
= +3.6V; V
COM_
= 0V, +1.2V;
V
NO_
or V
NC_
= V
COM_
or unconnected
-1
-1
0
7
(V
DD
-
1.8)
1.8
V
V
I
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DR
ON
0.1
2
I
DR
ON
R
FLAT(ON)
I
NO_(OFF)
I
NC_(OFF)
I
COM_(ON)
1.0
0.3
4
1.5
1
1
I
I
FA
FA
______________________________________________________________________________________
Two-Lane and Four-Lane DisplayPort Passive
Switches with Separate AUX/HPD Control
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +3.3V
Q10%,
T
A
= T
MIN
to T
MAX,
unless otherwise noted. Typical values are at V
DD
= +3.3V, T
A
= +25NC, unless otherwise
noted.) (Note 3)
PARAMETER
SEL1 and SEL2 to Switch
Turn-Off Time
Differential Insertion Loss
Differential Crosstalk
Differential Return Loss
Signal Data Rate
Differential -3dB Bandwidth
Differential Off-Isolation
LOGIC INPUT (SEL1, SEL2)
Input Logic-High
Input Logic-Low
Input Logic Hysteresis
Input Leakage Current
POWER SUPPLY
Power-Supply Range
V
DD
Supply Current
V
DD
I
DD
V
SEL_
= 0V or V
DD
3.0
500
3.6
850
V
FA
V
IH
V
IL
V
HYST
I
IN
V
SEL_
= 0V or V
DD
-1
100
+1
1.4
0.5
V
V
mV
FA
SYMBOL
t
OFF_SEL
S
DD21
S
DDCTK
S
DD11
BR
f
-3BW
S
DD21_OFF
CONDITIONS
V
NO_
or V
NC_
= +1.0V, R
L
= 50I,
C
L
= 100pF (Figure 1)
f = 0.8GHz (Figure 2)
f = 1.35GHz (Figure 2)
f = 0.8GHz (Figure 2)
f = 1.35GHz (Figure 2)
f = 0.8GHz (Figure 2)
f = 1.35GHz (Figure 2)
R
S
= R
L
= 100I balanced
R
S
= R
L
= 100I balanced
f = 1.35GHz (Figure 2)
MIN
TYP
5
-0.67
-0.95
-37
-34
-20
-14
17
8.5
-28
MAX
50
UNITS
ns
dB
dB
dB
Gbps
GHz
dB
MAX4998/MAX14998
Note 3:
All units are 100% production tested at T
A
= +85NC. Limits over the operating temperature range are guaranteed by
design and characterization and are not production tested.
Note 4:
DR
ON
= R
ON(MAX)
- R
ON(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
+3.3V
V
DD
MAX4998/MAX14998
V
N_
NO_ OR NC_
COM_
R
L
SEL_
LOGIC
INPUT
SEL
GND
SWITCH
OUTPUT
COM_
t
OFF_SEL
V
OUT
C
L
SWITCH
OUTPUT
COM_
0V
t
ON_SEL
t
OFF_SEL
0.9 x V
OUT
0V
t
ON_SEL
0.9 x V
OUT
V
OUT
0.9 x V
OUT
0.9 x V
OUT
LOGIC
INPUT
SEL_
V
IH
V
IL
50%
t
r
< 5ns
t
f
< 5ns
C
L
INCLUDES FIXTURE AND STRAY CAPACITANCE.
R
L
V
OUT
= V
N_
R
L
+ R
ON
(
)
Figure 1. Switching Time
_______________________________________________________________________________________
3
Two-Lane and Four-Lane DisplayPort Passive
Switches with Separate AUX/HPD Control
MAX4998/MAX14998
Test Circuits/Timing Diagrams (continued)
+3.3V
0.1µF
NETWORK
ANALYZER
50Ω
V
DD
V
DD
SEL1
SEL2
MAX4998
MAX14998
+3.3V
0.1µF
NETWORK
ANALYZER
50Ω
V
DD
0V
0V
SEL1
SEL2
MAX4998
MAX14998
COM_+
PORT 1
V
IN+
PORT 2
V
IN-
V
DD
COM_+
PORT 1
V
IN+
PORT 2
V
IN-
50Ω
50Ω
COM_-
COM_-
50Ω
50Ω
NC_+
NO_+
NO_-
GND
NC_-
PORT 3
V
OUT+
50Ω
50Ω
NO_+
NO_-
GND
NC_+
PORT 3
V
OUT+
50Ω
PORT 4
V
OUT-
50Ω
50Ω
NC_-
PORT 4
V
OUT-
50Ω
DIFFERENTIAL INSERTION LOSS/DIFFERENTIAL RETURN LOSS
DIFFERENTIAL INSERTION LOSS = 20log
DIFFERENTIAL OFF-ISOLATION
DIFFERENTIAL OFF-ISOLATION = 20log
(
V
OUT+
- V
OUT-
V
IN+
- V
IN-
+3.3V
0.1µF
)
(
V
OUT+
- V
OUT-
V
IN+
- V
IN-
)
V
DD
0V OR V
DD
0V OR V
DD
SEL1
SEL2
MAX4998
MAX14998
50Ω
50Ω
50Ω
50Ω
COM_+
PORT 1
V
IN+
PORT 2
V
IN-
NETWORK
ANALYZER
50Ω
50Ω
COM_-
COM_+
COM_-
NO_+/NC_+
NO_-/NC_-
GND
NO_-/NC_-
PORT 4
V
OUT-
50Ω
PORT 3
V
OUT+
50Ω
NO_+/NC_+
DIFFERENTIAL CROSSTALK
DIFFERENTIAL CROSSTALK = 20log
(
V
OUT+
- V
OUT-
V
IN+
- V
IN-
)
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.
Figure 2. Differential On-Loss, Differential Off-Isolation, and Differential Crosstalk
4
______________________________________________________________________________________
Two-Lane and Four-Lane DisplayPort Passive
Switches with Separate AUX/HPD Control
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
MAX4998/MAX14998
ON-RESISTANCE vs. COM_ VOLTAGE
MAX4998/MAX14998 toc01
ON-RESISTANCE vs. COM_ VOLTAGE
MAX4998/MAX14998 toc02
SUPPLY CURRENT vs. TEMPERATURE
V
DD
= 3.3V
700
SUPPLY CURRENT (µA)
600
500
400
300
200
100
MAX4998/MAX14998 toc03
8.0
7.5
ON-RESISTANCE (Ω)
7.0
6.5
6.0
5.5
5.0
4.5
4.0
V
DD
= 3.6V
I
COM_
= 15mA
10
9
ON-RESISTANCE (Ω)
8
V
DD
= 3.3V
I
COM_
= 15mA
T
A
= +85°C
T
A
= +25°C
800
7
T
A
= -40°C
6
5
4
-0.1 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9
V
COM_
(V)
-0.1 0.1
0.3
0.5
0.7
0.9
1.1
1.3
1.5
0
-40
-15
10
35
60
85
TEMPERATURE (°C)
V
COM_
(V)
LOGIC THRESHOLD vs. SUPPLY VOLTAGE
MAX4998/MAX14998 toc04
TURN-ON/OFF TIME vs. SUPPLY VOLTAGE
MAX4998/MAX14998 toc05
DIFFERENTIAL INSERTION LOSS
DIFFERENTIAL INSERTION LOSS (dB)
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
MAX4998/MAX14998 toc06
1.5
1.3
LOGIC THRESHOLD (V)
V
DD
= 3.3V
60
50
TURN-ON/OFF TIME (ns)
40
30
20
0
V
IH
1.1
0.9
0.7
0.5
3.0
3.1
3.2
3.3
3.4
3.5
t
ON_SEL
V
IL
t
OFF_SEL
10
0
3.6
3.0
3.1
3.2
3.3
3.4
3.5
3.6
10
100
1000
10,000
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
FREQUENCY (MHz)
DIFFERENTIAL OFF-ISOLATION
MAX4998/MAX14998 toc07
DIFFERENTIAL CROSSTALK
MAX4998/MAX14998 toc08
DIFFERENTIAL RETURN LOSS
-5
-10
-15
-20
-25
-30
-35
-40
MAX4998/MAX14998 toc09
0
DIFFERENTIAL OFF-ISOLATION (dB)
-10
-20
-30
-40
-50
-60
-70
-80
10
100
1000
0
-10
DIFFERENTIAL CROSSTALK (dB)
-20
-30
-40
-50
-60
-70
-80
0
DIFFERENTIAL RETURN LOSS (dB)
10,000
10
100
1000
10,000
10
100
1000
10,000
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
_______________________________________________________________________________________
5
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