Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Video editing Video switcher TQFN 56 EP (5x11)

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General Description

The MAX4928A/MAX4928B high-speed passive switch-

es route PCI Express

®

(PCIe) data and/or DisplayPort™

signals between two possible destinations in desktop or

laptop PCs. The MAX4928A is intended to be used with

the ATX form factor desktop PCs, while the MAX4928B

is expected to be used in the BTX form factor.

The MAX4928A/MAX4928B are hex double-pole/dou-

ble-throw (6 x DPDT) switches. The MAX4928A/

MAX4928B feature a single digital control input (SEL) to

switch signal paths and a latch input (LE) that holds the

switches in a given state.

The MAX4928A/MAX4928B are fully specified to oper-

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

MAX4928A/MAX4928B are available in an industry

standard 5mm x 11mm, 56-pin TQFN package. Both

devices operate over the -40°C to +85°C extended

temperature range.

Applications

Desktop PCs

Notebook PCs

Features

♦ Single +3.3V Power Supply Voltage

♦ Supports PCIe Gen I, Gen II, and DisplayPort

Data Rates > 5Gbps

♦ Excellent Return Loss > 12dB at 2.5GHz

♦ Six Bidirectional Pairs of Switches

All Switching in One Device

♦ Low 850µA (max) Supply Current

♦ Small 5mm x 11mm, 56-Pin TQFN Package

♦ Industry-Standard Pinouts

MAX4928A/MAX4928B

DisplayPort/PCIe Passive Switches

________________________________________________________________

Maxim Integrated Products

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19-4030; Rev 1; 8/08

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.

Typical Operating Circuit appears at end of data sheet.

MAX4928A

21 22 23 24 25 26 27 28

V

DD

*EP

GND

TX0+

TX0-

TX1+

TX1-

V

DD

GND

GND

V

DD

HPD2

HPD1

AUX-

AUX+

V

DD

GND

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46

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43

54 5356 55 52 51 50 49

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42

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OUT+

OUT-

X+

GND

IN3-

IN3+

SEL

LE

GND

V

DD

GND

X-

IN2-

IN2+

V

DD

IN1-

IN1+

IN0-

IN0+

GND

D3+

D3-

GND

D2-

D2+

D1-

RX1+

RX1-

GND

RX0-

RX0+

V

DD

D1+

D0-

D0+

TX3-

TX3+

TX2-

TX2+

GND

*CONNECT EXPOSED PADDLE TO GND.

TQFN

TOP VIEW

MAX4928B

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V

DD

*EP

GND

D0+

D0-

D1+

D1-

V

DD

GND

GND

V

DD

RX1-

RX1+

RX0-

RX0+

V

DD

GND

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46

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43

54 5356 55 52 51 50 49

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+

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IN3+

IN3-

OUT+

GND

IN2-

IN2+

X+

X-

GND

V

DD

GND

OUT-

IN1-

IN1+

V

DD

IN0-

IN0+

LE

SEL

GND

TX3+

TX3-

GND

TX2-

TX2+

TX1-

HPD1

HPD2

GND

AUX-

AUX+

V

DD

TX1+

TX0-

TX0+

D3-

D3+

D2-

D2+

GND

TQFN

Pin Configurations

PCI Express is a registered trademark of PCI-SIG.

DisplayPort is a trademark of Video Electronics Standards

Association (VESA).

PART TEMP RANGE PIN-PACKAGE

MAX4928AETN+

-40°C to +85°F 56 TQFN-EP

MAX4928BETN+

-40°C to +85°F 56 TQFN-EP

Ordering Information

+

Denotes a lead-free package/RoHS-Compliant package.

EP = Exposed paddle.

Summary of content (13 pages)

PAGE 1
9-4030; Rev 1; 8/08 DisplayPort/PCIe Passive Switches The MAX4928A/MAX4928B high-speed passive switches route PCI Express® (PCIe) data and/or DisplayPort™ signals between two possible destinations in desktop or laptop PCs. The MAX4928A is intended to be used with the ATX form factor desktop PCs, while the MAX4928B is expected to be used in the BTX form factor. The MAX4928A/MAX4928B are hex double-pole/double-throw (6 x DPDT) switches.
PAGE 2
MAX4928A/MAX4928B DisplayPort/PCIe Passive Switches ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) VDD ...........................................................................-0.3V to +4V LE, SEL, IN_, X_, OUT_, D_, TX_, HPD_, RX_, AUX_ (Note 1) ...............................................-0.3V to + (VDD + 0.3V) |VIN_ - VTX_|, |VIN_ - VD_|, |VX_ - VHPD_|, |VX_ - VRX1_|, |VOUT_ - VAUX_|, |VOUT_ - VRX0_| (Note 1) ...................
PAGE 3
DisplayPort/PCIe Passive Switches (VDD = +3.3V ±10%, TA =TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +3.3V, TA = +25°C, unless otherwise noted.) (Note 3) PARAMETER D_ or TX_/ HPD_ or RX1_/ AUX_ or RX0_ Off-Leakage Current IN_/X_/OUT_ On-Leakage Current SYMBOL ID_ (OFF) ITX_ (OFF) IHPD_ (OFF) IRX1_ (OFF) IAUX_ (OFF) IRX0_ (OFF) IIN_ (ON) IX_ (ON) IOUT_ (ON) CONDITIONS MIN VDD = +3.6V , VIN_ = VX_ = VOUT_ = 0V, +1.2V; VD_ or VTX_, VHPD_ or VRX1_, VAUX_ or VRX0_ = +1.
PAGE 4
MAX4928A/MAX4928B DisplayPort/PCIe Passive Switches ELECTRICAL CHARACTERISTICS (continued) (VDD = +3.3V ±10%, TA =TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +3.3V, TA = +25°C, unless otherwise noted.) (Note 3) PARAMETER Signal Data Rate Differential -3dB Bandwidth SYMBOL CONDITIONS MIN TYP MAX UNITS BR RS = RL = 100Ω balanced 10 Gbps DBW RS = RL = 100Ω balanced 5 GHz LOGIC INPUT (LE, SEL) Input Logic-High Input Logic-Low VIH 1.
PAGE 5
DisplayPort/PCIe Passive Switches 8.5 8.0 7.5 7.0 6.5 8.5 8.0 7.0 6.5 6.0 5.5 5.5 5.0 5.0 0.9 1.1 1.3 TA = -40°C 0.3 LOGIC THRESHOLD vs. SUPPLY VOLTAGE 0.7 0.9 1.1 1.3 1.5 -40 1.1 0.9 VIL 60 tON_SEL 40 tOFF_SEL 20 0.5 3.5 3.6 3.1 3.2 3.3 3.4 3.5 1,000 FREQUENCY (MHz) -8 10 -20 10,000 100 1,000 10,000 FREQUENCY (MHz) DIFFERENTIAL RETURN LOSS -40 -600 -80 -100 -80 100 -6 3.
PAGE 6
DisplayPort/PCIe Passive Switches MAX4928A/MAX4928B Test Circuits/Timing Diagrams LOGIC INPUT LE MAX4928A/MAX4928B +3.3V VDD VN_ D_ OR TX_, HPD_ OR RX1_, AUX_ OR RX0_ IN_, X_, OR OUT_ VOUT RL LOGIC INPUT SEL 50% VIL t OFF_SEL CL SEL LOGIC INPUT SEL GND SWITCH OUTPUT TX_, RX1_, OR RX0_ LE LOGIC INPUT LE VOUT 0.9 x VOUT 0.9 x VOUT 0V t ON_SEL t OFF_SEL SWITCH OUTPUT D_, HPD_, OR AUX CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VOUT = VN_ RL + RON ( t r < 5ns t f < 5ns VIH ) 0.
PAGE 7
DisplayPort/PCIe Passive Switches +3.3V +3.3V 0.1μF 0.
PAGE 8
MAX4928A/MAX4928B DisplayPort/PCIe Passive Switches Pin Description PIN MAX4928A NAME 1, 11, 16, 20, 21, 1, 11, 16, 20, 21, 28, 29, 35, 48, 28, 29, 35, 48, 49, 56 49, 56 GND Ground IN0+ Analog Switch 1—Common Positive Terminal Analog Switch 1—Common Negative Terminal 2 4 3 5 IN0- 4 7 IN1+ Analog Switch 2—Common Positive Terminal 5 8 IN1- Analog Switch 2—Common Negative Terminal VDD Positive Supply Voltage Input. Connect VDD to a +3.0V to +3.6V supply voltage.
PAGE 9
DisplayPort/PCIe Passive Switches PIN MAX4928A MAX4928B 47 39 51 52 NAME FUNCTION TX2+ Analog Switch 3—Normally Closed Positive Terminal 40 TX1- Analog Switch 2—Normally Closed Negative Terminal 41 TX1+ Analog Switch 2—Normally Closed Positive Terminal 53 42 TX0- Analog Switch 1—Normally Closed Negative Terminal 54 43 TX0+ — — EP Analog Switch 1—Normally Closed Positive Terminal Exposed Pad. Connect EP to GND. Exposed pad internally connected to GND.
PAGE 10
DisplayPort/PCIe Passive Switches MAX4928A/MAX4928B Functional Diagram/Truth Table VDD MAX4928A MAX4928B IN0+ TX0+ IN0- TX0D0+ D0- IN1+ TX1+ IN1- TX1D1+ D1- IN2+ TX2+ IN2- TX2D2+ LE SEL 1 0 0 X 0 1 IN_ TO TX_, IN_ TO DO_, X_ TO RX1_, X_ TO HPD_, OUT_ TO RX0_ OUT_ TO AUX_ NO CHANGE ON OFF NO CHANGE OFF ON D2IN3+ TX3+ IN3- TX3D3+ D3- X = DON'T CARE.
PAGE 11
DisplayPort/PCIe Passive Switches DP CONNECTOR VDD VCC = 1V PCIe BUFF 1 PCIe BUFF 2 PCIe BUFF 3 PCIe BUFF 4 PCIe IN AUX CHANNEL SELECT IN0+ IN0IN1+ IN1IN2+ IN2IN3+ IN3X+ XOUT+ OUT- MAX4928A MAX4928B D0+ D0D1+ D1D2+ D2D3+ D3HPD1 HPD2 AUX+ AUX- VCC N GRAPHICS AND MEMORY CONTROLLER HUB D0 D1 D2 D3 D4 D5 D6 D7 HPD AUX AUX 1.
PAGE 12
MAX4928A/MAX4928B DisplayPort/PCIe Passive Switches Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. 12 PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
PAGE 13
DisplayPort/PCIe Passive Switches REVISION NUMBER REVISION DATE 0 2/08 Initial release 1 8/08 Changed functional diagram and limits DESCRIPTION PAGES CHANGED — 1, 2, 11 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.