Maxim MAX4888A User Manual

General Description

The MAX4888A/MAX4889A high-speed passive switches route PCI Express

®

(PCIe) data between two possible destinations. The MAX4888A is a quad single-pole/double-throw (4 x SPDT) switch ideally suited for switching two half lanes of PCIe data between two destinations. The MAX4889A is an octal single-pole/double-throw (8 x SPDT) switch ideal for switching four half lanes of PCIe data between four destinations. The MAX4888A/ MAX4889A feature a single digital control input (SEL) to switch signal paths.

The MAX4888A/MAX4889A are fully specified to operate from a single 3.0V to 3.6V power supply and also operate down to +1.65V. The MAX4888A is available in a 3.5mm x 5.5mm, 28-pin TQFN package. The MAX4889A is available in a 3.5mm x 9.0mm, 42-pin TQFN package. Both devices operate over the -40°C to +85°C temperature range.

Applications

Desktop Computers

Servers/Storage Area Networks

Laptops

Features

o Single 1.65V to 3.6V Power-Supply Voltage

o Low Same-Pair Skew of 7ps

o Low 120µA (Max) Quiescent Current

o Supports PCIe Gen I and Gen || Data Rates

o Flow-Through Pin Configuration for Ease of

Layout

o Industry-Compatible Pinout

o Lead-Free Packaging

MAX4888A/MAX4889A

5.0Gbps PCI Express Passive Switches

________________________________________________________________

Maxim Integrated Products

1

Pin Configurations

Ordering Information/

Selector Guide

19-0770; Rev 0; 4/07

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.

Note: All devices are specified over the -40°C to +85°C operat-

ing temperature range.

+

Denotes lead-free package.

*

EP = Exposed paddle.

PART

PIN-

CONFIGURATION

PKG

CODE

MAX4888AETI+

Two

Half Lanes

M A X4 8 8 9 A E TO +

Four Half

Lanes

Typical Application Circuit appears at end of data sheet.

PCI Express is a registered trademark of PCI-Sig Corp.

PACKAGE

28 TQFN-EP*

42 TQFN-EP*

T283555-1

T423590M-1

TOP VIEW

GND

V+

GND

V+

NO1-

NO1+

V+

GND

NC2-

NC2+

NC1-

NC1+

24 23 22 21 20 19 18 17 16 15

25

26

*EP

SEL

MAX4888A

N.C.

COM1+

COM1-

COM2+

V+

COM2-

27

28

+

12345678910

GND

TQFN

NO2-

NO2+

GND

14

V+

13

12

GND

11

V+

N.C.

GND

*CONNECT EXPOSED PADDLE TO GROUND.

GND

NC4+

NC4-

NO3+

NC3-

NC3+

V+

NO2-

NO2+

NO1-

NO1+

NC2-

NC2+

NC1-

NC1+

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

39

40

V+

41

*EP

42

V+

+

1234567891011121314151617

COM1+

COM1-

GND

MAX4889A

COM2+

COM2-

V+

SEL

GND

COM3-

COM3+

V+

TQFN

NO3-

V+

GND

COM4+

NO4+

COM4-

NO4-

21

20

19

18

GND

V+

GND

V+

MAX4888A/MAX4889A

5.0Gbps PCI Express Passive Switches

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = 3.0V to 3.6V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at V+ = 3.3V, TA= +25°C.) (Note 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.)

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

SEL, COM__, NO__, NC__ (Note 1) .............-0.3V to (V+ + 0.3V)

| COM__ - NO__ |, | COM__ - NC__ | (Note 1) ...................0 to 2V

Continuous Current (COM_ to NO__/NC__) .....................±70mA

Peak Current (COM__ to NO__/NC__)

(pulsed at 1ms, 10% duty cycle)..................................±70mA

Continuous Current (SEL).................................................±30mA

Peak Current (SEL)

(pulsed at 1ms, 10% duty cycle)................................±150mA

Continuous Power Dissipation (T

A

= +70°C)

28-Pin TQFN (derate 20.8mW/°C above +70°C) ....1666.7mW

42-Pin TQFN (derate 35.7mW/°C above +70°C) ....2857.1mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Junction Temperature......................................................+150°C

)

Note 1: Signals on SEL, NO__, NC__ or COM__ exceeding V+ or GND are clamped by internal diodes. Limit forward-diode current

to maximum current rating.

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V

,

COM_

V

NO_, VNC_

-

| V

COM_

| ,

V

NO_

| V

-

COM_

|

V

NC_

ON

ΔR

ON

ΔR

ON

FLAT(ON

I

NO_(OFF

I

NC_(OFF

I

COM_(ON

V+ = 3.0V, I

or V

V

NO_

V+ = 3.0V, I

or V

V

NO_

V+ = 3.0V, I

or V

V

NO_

V+ = 3.0V, I

or V

V

NO_

V+ = 3.6V, V V

or V

NO_

V+ = 3.6V, V

or V

V

NO_

= 15mA,

COM_

= 0V, 1.8V

NC_

= 15mA,

COM_

= 0V (Notes 3, 4)

NC_

= 15mA,

COM_

= 0V (Notes 3, 4)

NC_

= 15mA

COM_

= 0V, 1.8V (Notes 4, 5)

NC_

= 0V, 1.8V,

COM_

= 1.8V, 0V

NC_

= 0V, 1.8V,

COM_

NC_

= V

or unconnected

COM_

-0.1 (V+ - 1.2) V

0 1.8 V

7 Ω

0.1 1 Ω

0.6 2 Ω

0.06 2 Ω

-1 +1 µA

MAX4888A/MAX4889A

5.0Gbps PCI Express Passive Switches

_______________________________________________________________________________________ 3

Note 2: All units are 100% production tested at TA= +85°C. Limits over the operating temperature range are guaranteed by design

and characterization and are not production tested.

Note 3: ΔR

ON

= R

ON (MAX)

- R

ON (MIN)

.

Note 4: Guaranteed by design. Not production tested. Note 5: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the

specified analog signal range.

)

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 3.0V to 3.6V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at V+ = 3.3V, TA= +25°C.) (Note 2)

DYNAMIC

Turn-On Time t

Turn-Off Time t

Propagation Delay t

Output Skew Between Pairs t

Output Skew Between Same Pair

On-Loss G

Crosstalk V

Signaling Data Rate BR RS = RL = 50Ω 5.0 Gbps

Off-Isolation V

NO_/NC_ Off-Capacitance

COM_ On-Capacitance C

LOGIC INPUT

Input-Logic Low V

Input-Logic High V

Input-Logic Hysteresis V

Input Leakage Current I

POWER SUPPLY

Power-Supply Range V+ 1.65 3.60 V

V+ Supply Current I+ V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V

ON

OFF

PD

SK1

t

SK2

LOS

CT1

ISO

C

N O_/N C _( OFF)

COM_(ON

IL

IH

HYST

IN

or V

NO_

V

or V

NO_

RS = RL = 50Ω, unbalanced, Figure 2 50 ps

RS = RL = 50Ω , unb al anced ; skew b etw een any tw o p ai r s, Fi g ur e 2

RS = RL = 50Ω , unb al anced ; skew b etw een tw o l i nes on sam e p ai r , Fi g ur e 2

RS = RL = 50Ω, unbalanced, Figure 3

Crosstalk between any two pairs, R

= RL = 50Ω,

S

unbalanced, Figure 3

Signal = 0dBm, R

= RL = 50Ω,

S

Figure 3

Figure 4 1 pF

Figure 4 2 pF

V

= 0V or V+ -1 +1 µA

SEL

= 0V or V+

SEL

= 1.0V, RL = 50Ω, Figure 1 90 250 ns

NC_

= 1.0V, RL = 50Ω, Figure 1 10 50 ns

NC_

50 ps

10 ps

1MHz < f < 100MHz -0.5

< f < 1.25G H z-1.4

500M H z

f = 50MHz -53

f = 1.25GHz -32

f = 10MHz -56

f = 1.25GHz -26

0.5 V

1.4 V

100 mV

MAX4888A 60

MAX4889A 120

dB

µA

MAX4888A/MAX4889A

5.0Gbps PCI Express Passive Switches

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

ON-RESISTANCE vs. V

COM

V

COM

(V)

R

ON

(Ω)

MAX4888A/89A toc01

-0.1 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1

5.0

5.5

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

V+ = 3.3V

V+ = 2.5V

V+ = 1.8V

ON-RESISTANCE vs. V

COM

(V+ = 1.8V)

V

COM

(V)

R

ON

(Ω)

MAX4888A/89A toc02

-0.1 0 0.1 0.2 0.3 0.4 0.5 0.6

0

2

4

6

8

10

12

14

TA = +85°C

TA = +25°C

TA = -40°C

ON-RESISTANCE vs. V

COM

(V+ = 2.5V)

V

COM

(V)

R

ON

(Ω)

MAX4888A/89A toc03

-0.1 0.1 0.3 0.5 0.7 0.9 1.1 1.3

0

2

4

6

8

10

12

14

TA = +85°C

TA = +25°C

TA = -40°C

ON-RESISTANCE vs. V

COM

(V+ = 3.3V)

V

COM

(V)

R

ON

(Ω)

MAX4888A/89A toc04

-0.1 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1

0

2

4

6

8

10

12

14

TA = +85°C

TA = +25°C

TA = -40°C

SUPPLY CURRENT vs. TEMPERATURE

(MAX4889A)

TEMPERATURE (°C)

SUPPLY CURRENT (μA)

MAX4888A/89A toc05

-40 -15 10 35 60 85

0

10

20

30

40

50

60

70

80

V+ = 1.8V

V+ = 2.5V

V+ = 3.3V

LOGIC THRESHOLD vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

LOGIC THRESHOLD (V)

MAX4888A/89A toc06

1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

V

IH

V

IL

TURN-ON/-OFF TIME vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

t

ON

/t

OFF

(ns)

MAX4888A/89A toc07

1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6

0

20

40

60

80

100

120

140

160

180

200

220

240

NO_ t

ON

NO_ t

OFF

NC_ tON

NC_ t

OFF

MAX4888A/MAX4889A

5.0Gbps PCI Express Passive Switches

_______________________________________________________________________________________

5

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

EYE DIAGRAM

(V+ = 3.3V, f = 1.25GHz,

600mV

P-P

PRBS SIGNAL, RS = RL = 50Ω)

†

50ps/div

*PRBS = PSEUDORANDOM BIT SEQUENCE †

= GEN 1, 2.5Gbps; U1 = 400ps

V

COM_+

V

COM_-

50mV/div

MAX4888A/89A toc10

EYE DIAGRAM

(V+ = 1.8V, f = 2.5GHz,

600mV

P-P

PRBS SIGNAL, RS = RL = 50Ω)

††

25ps/div

*PRBS = PSEUDORANDOM BIT SEQUENCE ††

= GEN 11, 5.0Gbps; U1 = 200ps

V

COM_+

V

COM_-

50mV/div

MAX4888A/89A toc11

EYE DIAGRAM

(V+ = 3.3V, f = 2.5GHz,

600mV

P-P

PRBS SIGNAL, RS = RL = 50Ω)

††

25ps/div

*PRBS = PSEUDORANDOM BIT SEQUENCE ††

= GEN 11, 5.0Gbps; U1 = 200ps

V

COM_+

V

COM_-

50mV/div

MAX4888A/89A toc12

EYE DIAGRAM

(V+ = 2.5V, f = 2.5GHz,

600mV

P-P

PRBS SIGNAL, RS = RL = 50Ω)

††

25ps/div

*PRBS = PSEUDORANDOM BIT SEQUENCE ††

= GEN 11, 5.0Gbps; U1 = 200ps

V

COM_+

V

COM_-

50mV/div

MAX4888A/89A toc12

EYE DIAGRAM

(V+ = 2.5V, f = 1.25GHz,

600mV

P-P

PRBS SIGNAL, RS = RL = 50Ω)

†

50ps/div

*PRBS = PSEUDORANDOM BIT SEQUENCE †

= GEN 1, 2.5Gbps; U1 = 400ps

V

COM_+

V

COM_-

50mV/div

MAX4888A/89A toc09

EYE DIAGRAM

(V+ = 1.8V, f = 1.25GHz,

600mV

P-P

PRBS SIGNAL, RS = RL = 50Ω)†

50ps/div

*PRBS = PSEUDORANDOM BIT SEQUENCE †

= GEN 1, 2.5Gbps; U1 = 400ps

V

COM_+

V

COM_-

50mV/div

MAX4888A/89A toc08

MAX4888A/MAX4889A

5.0Gbps PCI Express Passive Switches

6 _______________________________________________________________________________________

Pin Description

MAX4888A MAX4889A

1, 10, 12, 14,

20, 25, 27

2 9 SEL Digital Control Input

3, 9 — N.C. No Connection. Not internally connected.

4 2 COM1+ Analog Switch 1. Common Positive Terminal. 5 3 COM1- Analog Switch 1. Common Negative Terminal. 6 6 COM2+ Analog Switch 2. Common Positive Terminal. 7 7 COM2- Analog Switch 2. Common Negative Terminal.

8, 11, 13, 19,

26, 28

15 31 NO2- Analog Switch 2. Normally Open Negative Terminal.

16 32 NO2+ Analog Switch 2. Normally Open Positive Terminal.

17 33 NO1- Analog Switch 1. Normally Open Negative Terminal.

18 34 NO1+ Analog Switch 1. Normally Open Positive Terminal.

21 35 NC2- Analog Switch 2. Normally Closed Negative Terminal.

22 36 NC2+ Analog Switch 2. Normally Closed Positive Terminal.

23 37 NC1- Analog Switch 1. Normally Closed Negative Terminal.

24 38 NC1+ Analog Switch 1. Normally Closed Positive Terminal.

— 11 COM3+ Analog Switch 3. Common Positive Terminal.

— 12 COM3- Analog Switch 3. Common Negative Terminal.

— 15 COM4+ Analog Switch 4. Common Positive Terminal.

— 16 COM4- Analog Switch 4. Common Negative Terminal.

— 22 NO4- Analog Switch 4. Normally Open Negative Terminal.

— 23 NO4+ Analog Switch 4. Normally Open Positive Terminal.

— 24 NO3- Analog Switch 3. Normally Open Negative Terminal.

— 25 NO3+ Analog Switch 3. Normally Open Positive Terminal.

— 26 NC4- Analog Switch 4. Normally Closed Negative Terminal.

— 27 NC4+ Analog Switch 4. Normally Closed Positive Terminal.

— 28 NC3- Analog Switch 3. Normally Closed Negative Terminal.

— 29 NC3+ Analog Switch 3. Normally Closed Positive Terminal.

EP EP EP Exposed Paddle. Connect EP to GND.

1, 4, 10, 14, 17,

19, 21, 39, 41

5, 8, 13, 18,

20, 30,

40, 42

NAME FUNCTION

GND Ground

Positive-Supply Voltage Input. Connect V+ to a 1.65V to 3.6V supply voltage.

V+

Bypass V+ to GND with a 0.1µF capacitor placed as close to the device as possible (See the Board Layout section).

MAX4888A/MAX4889A

Figure 1. Switching Time

Test Circuits/Timing Diagrams

5.0Gbps PCI Express Passive Switches

_______________________________________________________________________________________ 7

MAX4888A/MAX4889A

V

N_

LOGIC INPUT

3.3V

V+

L

NC_

COM_

R

)

ON

NO_ OR NC_

SEL

GND

C

INCLUDES FIXTURE AND STRAY CAPACITANCE.

L

= V

NO_

N_ (

R

OR V

V

OUT

RL + R

V

N_

V

LOGIC INPUT

V

OUT

L

C

L

SWITCH OUTPUT

IH

V

IL

0V

V

t

50%

OUT

ON

0.9 x V

0UT

tr < 5ns tf < 5ns

t

OFF

0.9 x V

OUT

MAX4888A/MAX4889A

5.0Gbps PCI Express Passive Switches

8 _______________________________________________________________________________________

Test Circuits/Timing Diagrams (continued)

Figure 2. Propagation Delay and Output Skew

3.3V

V+

MAX4888A/MAX4889A

NC_+

NC_-

COM

_+

_-

IN+

IN-

NO_+ OR

R

S

NO_- OR

R

S

SEL

1.5V

V

IN+

0V

1.5V

V

IN-

0V

t

PLHX

1.5V

V

OUT+

0V

50%

t

PHLX

50%

OUT+

RISE-TIME PROPAGATION DELAY = t

R

L

R

L

FALL-TIME PROPAGATION DELAY = t

t

=

DIFFERENCE IN PROPAGATION DELAY (RISE-FALL)

SK1

BETWEEN ANY TWO PAIRS

t

= | t

SK2

OUT-

t

INRISE

BETWEEN TWO LINES ON THE SAME PAIR

90%

10% 10%

t

OUTRISE

90%

10% 10%

PLHX

OR t

PLHX

PLHY

OR t

PHLX

PHLY

- t

PHLY

| OR | t

PHLX

t

INFALL

- t

|

PLHY

90%

t

OUTFALL

90%

1.5V

V

OUT-

50%

0V

t

PHLY

t

PLHY

MAX4888A/MAX4889A

5.0Gbps PCI Express Passive Switches

_______________________________________________________________________________________ 9

Detailed Description

The MAX4888A/MAX4889A high-speed passive switches route PCIe data between two possible destinations. The MAX4888A/MAX4889A are ideal for routing PCIe signals to change the system configuration. For example, in a graphics application, the MAX4888A/MAX4889A create

two sets of eight lanes from a single 16-lane bus. The MAX4888A/MAX4889A feature a single digital control input (SEL) to switch signal paths.

The MAX4888A/MAX4889A are fully specified to operate from a single 3.0V to 3.6V power supply and also operate down to 1.65V.

Digital Control Input (SEL)

The MAX4888A/MAX4889A provide a single digital control input (SEL) to select the signal path between the COM__ and NO__/NC__ channels. The truth tables for the MAX4888A/MAX4889A are depicted in the

Functional Diagrams/Truth Table

section. Drive SEL

rail-to-rail to minimize power consumption.

Analog Signal Levels

The MAX4888A/MAX4889A accept standard PCIe signals to a maximum of V+ - 1.2V. Signals on the COM_+ channels are routed to either the NO_+ or NC_+ channels, and signals on the COM_- channels are routed to either the NO_- or NC_- channels. The MAX4888A/ MAX4889A are bidirectional switches, allowing COM__, NO__, and NC__ to be used as either inputs or outputs.

Figure 4. Channel Off-/On-Capacitance

Figure 3. On-Loss, Off-Isolation, and Crosstalk

Test Circuits/Timing Diagrams (continued)

0.1μF

3.3V

0V OR V+

50Ω

MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED BETWEEN ANY TWO PAIRS. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.

SEL

NC_

V+

COM_

MAX4888A/MAX4889A

NO_

GND

V

NETWORK ANALYZER

V

IN

V

OUT

50Ω

MEAS REF

50Ω 50Ω

50Ω

OFF-ISOLATION = 20log

ON-LOSS = 20log

CROSSTALK = 20log

OUT

V

IN

V

OUT

V

IN

V

OUT

V

IN

3.3V

0.1μF

V+

CAPACITANCE

METER

COM_

NC_ or NO_

MAX4888A/MAX4889A

GND

SEL

OR V

V

IL

IH

MAX4888A/MAX4889A

5.0Gbps PCI Express Passive Switches

10 ______________________________________________________________________________________

Functional Diagrams/Truth Table

V+

MAX4888A

COM1+

COM1-

COM2+

COM2-

SEL

COM__TO

SEL

0

1ONOFF

NC__

GND

COM__TO

NO__

OFF

ON

NC1+

NC1-

NO1+

NO1-

NC2+

NC2-

NO2+

NO2-

COM1+

COM1-

COM2+

COM2-

COM3+

COM3-

COM4+

COM4-

V+

MAX4889A

NC1+

NC1-

NO1+

NO1-

NC2+

NC2-

NO2+

NO2-

NC3+

NC3-

NO3+

NO3-

NC4+

NC4-

NO4+

SEL

GND

NO4-

MAX4888A/MAX4889A

5.0Gbps PCI Express Passive Switches

______________________________________________________________________________________ 11

Applications Information

PCIe Switching

The MAX4888A/MAX4889A primary applications are aimed at reallocating PCIe lanes (see Figure 5). For example, in graphics applications, several manufacturers have found that it is possible to improve performance by a factor of nearly two by splitting a single 16-lane PCIe bus into two 8-lane buses. Two of the more prominent examples are SLI™ (Scaled Link Interface) and CrossFire™. The MAX4889A permits a computer motherboard to operate properly with a single 16-lane graphics card, and can later be updated to dual cards. The same motherboard can be used with dual cards where the user sets a jumper or a bit through software to switch between single- or dual-card operation. Common mode below 1V operation requirement.

Board Layout

High-speed switches require proper layout and design procedures for optimum performance. Keep designcontrolled impedance PCB traces as short as possible or follow impedance layouts per the PCIe specification. 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. Common mode below 1V operation requirement.

Figure 5. The MAX4888A/MAX4889A Used as a Single-Lane Switch

CrossFire is a trademark of ATI Technologies, Inc.

SLI is a trademark of NVIDIA Corporation.

Chip Information

PROCESS: CMOS

DATA

DIRECTION

ONE LANE

NOTE: ONLY ONE LANE IS SHOWN FOR CLARITY

MAX4888A MAX4889A

DATA IS ROUTED

TO EITHER

BOARD A OR B

AB

MAX4888A/MAX4889A

5.0Gbps PCI Express Passive Switches

12 ______________________________________________________________________________________

Typical Application Circuit

PCIe GRAPHICS INTERFACE

GRAPHICS

PCIe BUS

LANE 0 TX

LANE 1 TX

LANE 2 TX

LANE 3 TX

COM1+

COM1-

COM2+

COM2-

COM3+

COM3-

COM4+

COM4-

MAX4889A

SEL

NC1+

NC1-

NC2+

NC2-

NC3+

NC3-

NC4+

NC4-

NO1+

NO1-

NO2+

NO2-

NO3+

NO3-

NO4+

NO4-

CARD 1

GRAPHICS

CARD 2

LANE 0 RX

LANE 1 RX

LANE 2 RX

LANE 3 RX

COM1+

COM1-

COM2+

COM2-

COM3+

COM3-

COM4+

COM4-

MAX4889A

SEL

CHANNEL SELECT

NC1+

NC1-

NC2+

NC2-

NC3+

NC3-

NC4+

NC4-

NO1+

NO1-

NO2+

NO2-

NO3+

NO3-

NO4+

NO4-

CHANNEL SELECT

MAX4888A/MAX4889A

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages

.)

5.0Gbps PCI Express Passive Switches

______________________________________________________________________________________ 13

°

28L THIN QFN.EPS

MAX4888A/MAX4889A

5.0Gbps PCI Express Passive Switches

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.

14

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

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.

14

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

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages

.)

°

42L THIN QFN.EPS

Maxim MAX4888A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual