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MAX4888B/MAX4888C

Up to 8.0Gbps Dual Passive Switches

19-5706; Rev 0; 12/10

Typical Operating Circuit

General Description

The MAX4888B/MAX4888C dual double-pole/double-

throw (2 x DPDT), high-speed passive switches are

ideal for switching two half-lanes of PCI Express

(PCIe)

data between two possible destinations. These devices

feature a dual digital control input to switch signal paths.

The MAX4888C is intended for use in systems where

both the input and output are capacitively coupled (e.g.,

SAS, SATA, XAUI, and PCIe) and provides a 10FA (typ)

source current and a 60kI (typ) internal biasing resistor

to GND at the AOUT_ and BOUT_ pins.

The devices are fully specified to operate from a single

+3.3V (typ) power supply. Both devices are available

in an industry-standard 3.5mm x 5.5mm, 28-pin TQFN

package. They operate over the -40NC to +85NC extend-

ed temperature range.

Applications

Desktop PCs

Notebook PCs

Servers

Features

S Single +3.3V Power-Supply Voltage

S Supports PCIe Gen I, Gen II, and Gen III Data

Rates

S Supports Up To and Including 6.0Gbps SAS/SATA

Signals

S Supports Other High-Speed Interfaces (e.g., XAUI)

S Superior Bandwidth Return Loss

S Small, 3.5mm x 5.5mm, 28-Pin TQFN Package

Ordering Information

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

*EP = Exposed pad.

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

EVALUATION KIT

AVAILABLE

MAX4888C

GND

CONNECTION SELECT

AOUTA+

MAX4888C

GND

AOUTA-

BOUTA+

SEL

SELB

SEL

SELB

PCIe HOST

BOUTA-

AIN+

AIN-

BIN+

BIN-

AIN+

AIN-

BIN+

BIN-

AOUTB+

AOUTB-

BOUTB+

SAS HOST

NOTE: CAPACITIVE COUPLING WAS OMITTED TO SIMPLIFY ILLUSTRATION.

PCIe DEVICE

SAS DEVICE

BOUTB-

AOUTA+

AOUTA-

BOUTA+

BOUTA-

AOUTB+

AOUTB-

BOUTB+

BOUTB-

PART TEMP RANGE PIN-PACKAGE

MAX4888BETI+

-40NC to +85NC

28 TQFN-EP*

MAX4888CETI+

-40NC to +85NC

28 TQFN-EP*

Summary of content (10 pages)

PAGE 1
9-5706; Rev 0; 12/10 TION KIT EVALUA BLE AVAILA Up to 8.0Gbps Dual Passive Switches The MAX4888B/MAX4888C dual double-pole/doublethrow (2 x DPDT), high-speed passive switches are ideal for switching two half-lanes of PCI ExpressM (PCIe) data between two possible destinations. These devices feature a dual digital control input to switch signal paths. The MAX4888C is intended for use in systems where both the input and output are capacitively coupled (e.g.
PAGE 2
MAX4888B/MAX4888C Up to 8.0Gbps Dual Passive Switches ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) VCC. .........................................................................-0.3V to +4V SEL, SELB, AIN+, AIN-, BIN+, BIN-, AOUTA+, AOUTA-, AOUTB+, AOUTB-, BOUTA+, BOUTA-, BOUTB+, BOUTB- (Note 1)... -0.3V to (VCC + 0.3V) Continuous Current (AIN_ to AOUTA_/AOUTB_, BIN_ to BOUTA_/BOUTB_)...........................................
PAGE 3
Up to 8.0Gbps Dual Passive Switches (VCC = 3.3V Q10%, TA = -40NC to +85NC, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise noted.
PAGE 4
MAX4888B/MAX4888C Up to 8.0Gbps Dual Passive Switches Test Circuits/Timing Diagrams SOURCE LOAD MAX4888B MAX4888C 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. Switching Time Table 1. Insertion Loss Mask 4 FREQUENCY RANGE (GHz) MAXIMUM INSERTION LOSS (dB) 0 to 2.5 1/3 x fGHZ + 17/30 2.
PAGE 5
Up to 8.0Gbps Dual Passive Switches SOURCE LOAD MAX4888B MAX4888C 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 AFTER ELIMINATING SOURCE AND CABLE SKEWS. Figure 2.
PAGE 6
Typical Operating Characteristics (VCC = 3.3V, TA = +25NC, unless otherwise noted.) 6.5 6.0 VCC = 3.3V 5.0 4 4.5 3 TA = +25°C 300 TA = -40°C 0.3 0.6 0.9 1.2 1.5 100 0 0.3 0.6 0.9 1.2 -40 1.5 -15 10 35 60 80 70 tON_SEL 60 50 40 30 tOFF_SEL 20 0.9 0 DIFFERENTIAL RETURN LOSS (dB) MAX4888B/C toc05 90 TURN-ON/OFF TIME (ns) MAX4888B/C toc04 1.0 100 3.3 3.4 3.5 3.6 -20 -30 -40 -50 -60 MAX4888B -80 0 3.2 MASK -10 -70 10 0.8 3.0 3.1 3.2 3.3 3.4 3.5 0 3.
PAGE 7
Up to 8.0Gbps Dual Passive Switches SELB GND BOUTA- BOUTA+ VCC GND AOUTA- AOUTA+ SEL GND TOP VIEW 24 23 22 21 20 19 18 17 16 15 14 VCC VCC 25 GND 26 13 GND MAX4888B MAX4888C VCC 27 GND 28 12 VCC 11 GND *EP AOUTB+ 7 8 9 10 GND AIN- 6 BOUTB- GND 5 BOUTB+ 4 BIN- 3 BIN+ 2 AOUTB- 1 AIN+ + TQFN *CONNECT EXPOSED PAD TO GND.
PAGE 8
Up to 8.
PAGE 9
Up to 8.0Gbps Dual Passive Switches These devices are fully specified to operate from a single 3.0V to 3.6V power supply. Applications Information High-Speed Switching The devices’ primary applications are aimed at sharing resources. For example, a single lane of PCIe or SAS can be shared between a single host and two devices. This could be used for redundancy or to share resources such as a physical lane or route a lane between one host and two devices or two hosts and one device.
PAGE 10
MAX4888B/MAX4888C Up to 8.0Gbps Dual Passive Switches Revision History REVISION NUMBER REVISION DATE 0 12/10 DESCRIPTION Initial release PAGES CHANGED — 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.