Datasheet

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General Description

The MAX4889B/MAX4889C high-speed passive switch-

es route PCI Express

(PCIe) data between two possi-

ble destinations in desktop or notebook PCs. The

MAX4889B/MAX4889C are quad double-pole/double-

throw (4 x DPDT) switches ideal for switching four half

lanes of PCIe data between two destinations. The

MAX4889B/MAX4889C feature a single digital control

input (SEL) to switch signal paths.

The MAX4889C is intended for use in systems (e.g.,

SAS) where both the input and output are capacitively

coupled, and provides a 10µA (typ) source current and

a 60kΩ (typ) internal biasing resistor to GND at the

_OUT_ terminals.

The MAX4889B/MAX4889C are fully specified to oper-

ate from a single +3.3V (typ) power supply. Both

devices are available in an industry-standard 3.5mm x

9.0mm, 42-pin TQFN package. These devices operate

over the -40°C to +85°C extended temperature range.

Applications

Desktop PCs

Notebook PCs

Servers

Video Graphics Cards—SLI

(Scaled Link Interface) and CrossFire™

Features

♦ Single +3.3V Power-Supply Voltage

♦ Support PCIe Gen I, Gen II, and Gen III Data Rates

♦ Supports SAS I, SAS II, and SAS 6.0Gbps

(MAX4889C)

♦ Superior Return Loss

Better than -10dB (typ) at 5.0GHz

♦ Small 3.5mm x 9.0mm, 42-Pin TQFN Package

♦ Industry-Standard Pinouts

MAX4889B/MAX4889C

2.5/5.0/8.0Gbps PCIe Passive Switches

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4148; Rev 2; 8/10

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.

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

EP = Exposed pad.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX4889BETO+ -40°C to +85°C 42 TQFN-EP*

MAX4889CETO+ -40°C to +85°C 42 TQFN-EP*

Pin Configuration

TOP VIEW

MAX4889B

MAX4889C

TQFN

GND

1 2 3 4 5 6 7 8 9 1011121314151617

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

COUTB+

COUTB-

DIN+

DIN-

DOUTB+

DOUTB-

CIN-

CIN+

BOUTB-

BOUTB+

BIN-

BIN+

AOUTB-

AOUTB+

AIN-

AIN+

COUTA-

GND

DOUTA+

DOUTA-

GND

COUTA+

GND

SEL

BOUTA-

BOUTA+

GND

AOUTA-

AOUTA+

GND

*CONNECT EXPOSED PAD TO GROUND.

*EP

PCI Express is a registered service mark of PCI-SIG Corporation.

SLI is a registered trademark of NVIDIA Corporation.

CrossFire is a trademark of ATI Technologies, Inc.

Typical Operating Circuit appears at end of data sheet.

Summary of content (12 pages)

PAGE 1
9-4148; Rev 2; 8/10 KIT ATION EVALU E L B AVAILA 2.5/5.0/8.0Gbps PCIe Passive Switches Features The MAX4889B/MAX4889C high-speed passive switches route PCI Express® (PCIe) data between two possible destinations in desktop or notebook PCs. The MAX4889B/MAX4889C are quad double-pole/doublethrow (4 x DPDT) switches ideal for switching four half lanes of PCIe data between two destinations. The MAX4889B/MAX4889C feature a single digital control input (SEL) to switch signal paths. ♦ Single +3.
PAGE 2
MAX4889B/MAX4889C 2.5/5.0/8.0Gbps PCIe Passive Switches ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) VCC ...........................................................................-0.3V to +4V SEL, _IN_, _OUTA_, _OUTB_ (Note 1) .......-0.3V to (VCC + 0.3V) Continuous Current (AIN_ to AOUTA_/AOUTB_, BIN_ to BOUTA_/BOUTB_, CIN_ to COUTA_/COUTB_, DIN_ to DOUTA_/DOUTB_) .........................................................
PAGE 3
2.5/5.0/8.0Gbps PCIe Passive Switches (VCC = +3.3V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted.
PAGE 4
2.5/5.0/8.0Gbps PCIe Passive Switches MAX4889B/MAX4889C Test Circuits/Timing Diagrams SOURCE LOAD MAX4889B/ MAX4889C ZS VOUT Σ ZL SEL 50% SEL 50% 90% VOUT 10% tON_SEL tOFF_SEL THE FREQUENCY OF THE SIGNAL SHOULD BE ABOVE THE HIGHPASS FILTER CORNER OF THE COUPLING CAPACITORS. Figure 1.
PAGE 5
2.5/5.0/8.0Gbps PCIe Passive Switches SOURCE LOAD MAX4889B/ MAX4889C VS+ Σ VS- VSC+ VCALp - VCALn VOUTp ZS VOUTn ZL Σ ZS CALIBRATION VCALp ZS TRACES VCALn ZL Σ ZL 50% 50% 50% VOUTp - VOUTn 50% tPDr VOUTp VOUTn ZL SEL Σ VSC- ZS tPD = max (tPDr, tPDf) tPDf VCM VCM VCM VCM tSKEW = max (tSK1, tSK2) tSK1 tSK2 THE FREQUENCY OF THE SIGNALS SHOULD BE APPROXIMATELY 1/20 OF THE LOWEST DATA RATE. Figure 2.
PAGE 6
Typical Operating Characteristics (VCC = +3.3V, TA = +25°C, unless otherwise noted.) 7.0 10 TA = +85°C 9 8 7 RON (Ω) VCC = +3.6V 5.5 5 5.0 4 4.5 3 4.0 TA = -40°C TA = +25°C 0.6 1.2 1.8 VCC = +3.0V 450 400 VCC = +3.6V 350 VCC = +3.3V VCC = +3.0V 300 250 0 0.3 0.6 0.9 1.2 -40 1.5 -15 10 35 60 LOGIC THRESHOLD vs. SUPPLY VOLTAGE TURN-ON/-OFF TIME vs. SUPPLY VOLTAGE DIFFERENTIAL INSERTION LOSS vs.
PAGE 7
2.5/5.0/8.
PAGE 8
2.5/5.0/8.0Gbps PCIe Passive Switches MAX4889B/MAX4889C Pin Description PIN MAX4889B/ MAX4889C NAME 1 AIN+ Analog Switch 1. Common Positive Terminal. 2 AIN- Analog Switch 1. Common Negative Terminal. 3 AOUTB+ Analog Switch 1. Normally Open Positive Terminal. 4 AOUTB- Analog Switch 1. Normally Open Negative Terminal. 5 BIN+ Analog Switch 2. Common Positive Terminal. 6 BIN- Analog Switch 2. Common Negative Terminal. 7 BOUTB+ Analog Switch 2. Normally Open Positive Terminal.
PAGE 9
2.5/5.0/8.0Gbps PCIe Passive Switches The MAX4889B high-speed passive switch routes PCI Express (PCIe) data or other high-speed signals with amplitude of ≤ 1.2VP-P differential, and common-mode voltage close to 0V between two possible destinations. The MAX4889B is ideal for routing PCIe signals to change system configuration. For example, in a graphics application, four MAX4889B devices create two sets of eight lanes from a single 16-lane bus.
PAGE 10
2.5/5.0/8.
PAGE 11
2.5/5.0/8.0Gbps PCIe Passive Switches PROCESS: CMOS 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.
PAGE 12
MAX4889B/MAX4889C 2.5/5.0/8.0Gbps PCIe Passive Switches Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 2 8/10 Added 8.0Gbps PCIe passive switch to the title; added Gen III to the data rates in the Features section; changed the return loss in the Features section to -10dB (typ) at 5.0GHz All Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.