Maxim MAX4888A User's Manual
Contents
1. PACKAGE DUTLINE 28L THIN QFN 3 5x5 5x0 8mm DRAWING NOT TO SCALE COMMON DIMENSIONS EXPOSED PAD VARIATIONS Te83555 1 b D 5 40 e 0 50 BSC k 0 25 L 0 30 0 40 0 50 N 28 ND 4 NE 10 NOTES 1 DIMENSIONING amp TOLERANCING CONFORM ASME 14 5 1994 2 ALL DIMENSIDNS ARE IN MILLIMETERS ANGLES ARE IN DEGREES 3 N IS THE TOTAL NUMBER OF TERMINALS THE TERMINAL 1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95 1 5 012 DETAILS OF TERMINAL 1 IDENTIFIER ARE OPTIONAL BUT MUST BE LOCATED WITHIN THE ZONE INDICATED THE TERMINAL 1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE ZAN DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 025mm AND 0 30mm FROM TERMINAL TIP ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY 7 CDPLANARITY APPLIES TU THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS COPLANARITY SHALL NOT EXCEED 008mm TITLE PACKAGE OUTLINE 28L THIN QFN 3 5 5 5 0 8 APPROVAL DOCUMENT CONTROL NO IREV e HZ 21 0184 MARKING IS FOR PACKAGE ORIENTATION PURPOSE ONLY SHALL EXCEED 0 10mm LEAD CENTERLINES DEFINED BY DIMESIUN amp 0 05 DRAWING TO SCALE AVLAZCLA 13 V688PXVW V888P XVI MAX4888A MAX4889A 5 0Gbps PCI Express Passive Switches Package Information continued2. MAKINI 5 0Gbps PCI Express Passive Switches General Description Features The MAX4888A MAX4889A high speed passive switches Single 1 65V to 3 6V Power Supply Voltage route PCI Express9 PCle data between two possible destinations The MAX4888A is a quad single pole dou Low Same Pair Skew of 7ps ble throw 4 x SPDT switch ideally suited for switching Low 120 Max Quiescent Current two half lanes of PCle data between two destinations The MAX4889A is an octal single pole double throw 8 x Supports PCle Gen and Gen Data Rates SPDT switch ideal for switching four half lanes of PCle Flow Through Pin Configuration for Ease of data between four destinations The MAX4888A Layout MAX4889A feature a single digital control input SEL to switch signal paths Industry Compatible The MAX4888A MAX4889A are fully specified to oper Lead Free Packaging ate 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 TQFN package Ordering Information MAX4889A is available in a 3 5mm x 9 0mm 42 pin H TQFN package Both devices operate over the 40 C to Selector Guide 85 C temperature range _ PART 5 AGE CONFIGURATION pie Applications Desktop Computers 4888 28 TQFN EP T283555 1 Half Lanes Servers Storage Area Networks Laptops MAX4889AETO 42 TQFN EP a T423590M 1 Note All devices
3. 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 PIN 1 INDEX AREA 0 35 45 NE Dxe MARKING 0156 h TEM TOP VIEW SIDE VIEW joo OTTOM VIEW swe view IDDALLAS AVIAXL VI PACKAGE OUTLINE 42L THIN QFN 3 5x9x0 8mm APPROVAL DOCUMENT CONTROL NO 8 1 DRAWING TO SCALE 21 0181 2 DIMENSIDNS EXPDSED PAD VARIATIDNS 142 590 1 195 205 21 745 755 765 3 1 195 eos 15 7 45 7 55 765 NOTES 1 DIMENSIONING amp TOLERANCING CONFORM ASME 14 5 1994 2 ALL DIMENSIONS ARE IN MILLIMETERS ANGLES ARE IN DEGREES 3 N IS THE TOTAL NUMBER OF TERMINALS THE TERMINAL 1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM JESD 95 1 012 DETAILS OF TERMINAL 1 IDENTIFIER ARE OPTIONAL BUT MUST BE LOCATED WITHIN THE ZONE INDICATED THE TERMINAL 1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE ZAN DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0 25mm AND 0 30mm FROM TERMINAL TIP AND NE REFER TO THE NUMBER DF TERMINALS ON EACH D AND E SIDE RESPECTIVELY 7 CUPLANARITY APPLIES THE EXPDSED HEAT SINK SLUG AS WELL AS THE TERMINALS COPLANARITY SHALL NO
4. AVLAXL VI 5 0Gbps PCI Express Passive Switches 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 PARAMETER SYMBOL CONDITIONS DYNAMIC Turn On Time VNO VNC_ 1 0V RL 500 Figure 1 Turn Off Time VNO or VNC_ 1 0V RL 500 Figure 1 Propagation Delay Rs RL 500 unbalanced Figure 2 Rs RL 500 unbalanced skew between Output Skew Between Pairs any two pairs Figure 2 Output Skew Between Same Rs RL 500 unbalanced skew between Pair two lines on same pair Figure 2 Rs RL 500 1MHz lt f lt 100MHz On Loss unbalanced Figure 3 500MHz lt f lt 1 25GHz Crosstalk between any two pairs Crosstalk Rs RL 500 unbalanced f 1 25GHz Figure 3 f 50MHz Signaling Data Rate s 500 ignal OdBm f 10MHz Off Isolation e Ri 500 igure 3 f 1 25GHz NO_ NC_ Off Capacitance Fi COM_ CCOM ON LOGIC INPUT Logic Low Logic High Logic Hysteresis Leakage Current VSEL OV or V POWER SUPPLY Power Supply Range MAX4888A MAX4889A V Supply Current VsEL OV or V 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
5. 1mW Operating Temperature Range 40 C to 85 C Storage Temperature Range Lead Temperature soldering 10s Junction Temperature exceeding V or GND are clamped by internal diodes Limit forward diode current 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 3 0V to 3 6V 40 C to 85 C unless otherwise noted Typical values are at V 3 3V TA 25 C Note 2 PARAMETER SYMBOL CONDITIONS ANALOG SWITCH VCOM_ Analog Signal Range dob VNO_ VNC_ Voltage Between COM and NO NC On Resistance 15mA OV 1 8V On Resistance Match Between Pairs of Same Channel OV Notes 3 4 15mA On Resistance Match Between Channels On Resistance Flatness RFLAT ON OV 1 8V Notes 4 5 OV Notes 3 4 15mA 15mA NO_ or NC_ Off Leakage Current COM_ On Leakage Current INO OFF INC OFF VCOM_ OV 1 8V C 1 8V OV VcoM_ OV 1 8V C_ _ unconnected
6. NC4 Ana i y Closed Negative Terminal NC4 Ana i y Closed Positive Terminal Analog Switch 3 Normally Closed Negative Terminal Analog Switch 3 Normally Closed Positive Terminal Exposed Paddle Connect EP to GND 6 MAXUM 5 0Gbps PCI Express Passive Switches Test Circuits Timing Diagrams MAXIM MAX4888A MAX4889A tr lt 5ns tf lt 5ns 1 Vour TI SWITCH OUTPUT INCLUDES FIXTURE AND STRAY CAPACITANCE RL Amon VN VN0_ OR Vc Figure 1 Switching Time AVLAZCLA 7 V688PXVW V888PXVIW MAX4888A MAX4889A 5 0Gbps PCI Express Passive Switches Test Circuits Timing Diagrams continued V MAXIM MAX4888A MAX4889A RISE TIME PROPAGATION DELAY tpi ux OR FALL TIME PROPAGATION DELAY OR DIFFERENCE IN PROPAGATION DELAY RISE FALL BETWEEN ANY TWO PAIRS 1 tPLHX tphLY OR tphLX BETWEEN TWO LINES ON THE SAME PAIR INRISE lNFALL touTRISE lOUTFALL Figure 2 Propagation Delay and Output Skew 8 MAXIM 5 0Gbps PCI Express Passive Switches Test Circuits Timing Diagrams continued 33V OduF SEL OFF ISOLATION 20log pn NETWORK ANALYZER 500 ON LOSS 2000 OUT MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS AAA CROSSTALK 20100 our OFF ISOLATION IS MEASURED BETWEEN COM_ AND OFF NO_ OR
7. are specified over the 40 C to 85 C operat ing temperature range Denotes lead free package PCI Express is a registered trademark of PCI Sig Corp Exposed paddle Typical Application Circuit appears at end of data sheet Pin Configurations TOP VIEW MAXIM 43 ap MAXIM E a MAX4889A EXPOSED PADDLE TO GROUND MAXIM 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 V688PXVW V888PXVM MAX4888A MAX4889A 5 0Gbps PCI Express Passive Switches ABSOLUTE MAXIMUM RATINGS All voltages referenced to GND unless otherwise noted ME UAM Eu ENIM C ED E EE 0 3V to 4V SEL COM__ NO__ NC__ Note 1 0 3V to V 0 3V ICOM NO LICOM NC Note 1 0 to 2V Continuous Current COM to __ _ 70 Peak Current to NO NC pulsed at 1ms 10 duty 70 Continuous Current SEL Peak Current SEL pulsed at 1ms 10 duty z150mA IT Note 1 Signals on SEL NO NC to maximum current rating or COM Continuous Power Dissipation TA 70 28 TQFN derate 20 8mW C above 70 C 1666 7mW 42 TQFN derate 35 7mW C above 70 C 2857
8. ARON RON MAX RON 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 3 V688PXVW V888PXVM MAX4888A MAX4889A 5 0Gbps PCI Express Passive Switches TA 25 C unless otherwise noted Typical Operating Characteristics ON RESISTANCE vs Vcom ON RESISTANCE vs Vcom MAX4888A 89A toc03 MAX4888A 89A toc06 ON RESISTANCE vs VcoM V 1 8V V 2 5V 5 14 14 Ta 485 C 12 12 E 10 10 g 4 4 2 2 0 0 0 0 1 0 1 0 3 0 5 0 7 09 11 13 15 1 7 1 9 2 1 0 1 0 01 02 03 04 0 5 06 01 01 03 05 07 09 11 13 Vcom V Vcom V Vcom V ON RESISTANCE vs VcoM SUPPLY CURRENT vs TEMPERATURE V 3 3V MAX4889A LOGIC THRESHOLD vs SUPPLY VOLTAGE 14 8 2 12 7 8 1 10 6 2 s 10 5 a 5 09 g 6 gt 08 m 59 a co 4 zB S 07 2 2 1 6 0 5 0 1 0 1 0 3 0 5 0 7 0 9 1 1 1 3 1 5 17 1 9 21 40 15 10 35 60 85 1 6 1 8 2 0 2 2 24 2 6 28 3 0 3 2 34 3 6 Vcom V TEMPERATUR
9. E C SUPPLY VOLTAGE V TURN ON OFF TIME vs SUPPLY VOLTAGE 1 6 18 20 22 24 26 28 30 32 34 36 SUPPLY VOLTAGE V 4 AVLAZCL AVI 5 0Gbps PCI Express Passive Switches TA 25 C unless otherwise noted EYE DIAGRAM V 1 8V f 1 25GHz 600mVp p PRBS SIGNAL Rs 50 t MAX4888A 89A toc08 50mV div 50ps div PRBS PSEUDORANDOM BIT SEQUENCE T GEN 1 2 5Gbps U1 400ps EYE DIAGRAM V 1 8V f 2 5GHz 600mVp p PRBS SIGNAL Rs RL w 50mV div c e te MAX4888A 89A toc11 ai vow Li Li i 25ps div PRBS PSEUDORANDOM BIT SEQUENCE tt GEN 11 5 0Gbps U1 200ps Typical Operating Characteristics continued EYE DIAGRAM V 2 5V f 1 25GHz 600mVp p PRBS SIGNAL Rs 500 50ps div PRBS PSEUDORANDOM BIT SEQUENCE 1 GEN 1 2 5Gbps U1 400ps EYE DIAGRAM V 2 5V f 2 5GHz 600mVp p PRBS SIGNAL Rs 5 50mV div k 4 uwa 25ps div PRBS PSEUDORANDOM BIT SEQUENCE GEN 11 5 0Gbps U1 200ps MAX4888A 89A toc09 2 MAX4888A 89A toc12 EYE DIAGRAM V 3 3V f 1 25GHz 600mVp p PRBS SIGNAL Rs Ri 500 50mV div 50ps div PRBS PSEUDORANDOM BIT SEQUENCE T GEN 1 2 5Gbps U1 400 EYE DIAGRAM V 3 3V f 2 5GHz 600mVp p PRBS SIGNAL Rs Ry 5 50mV div k 1 4 ga OE 25ps div
10. PRBS PSEUDORANDOM BIT SEQUENCE GEN 11 5 0Gbps U1 200ps 5 1 E e MAX4888A 89A toc12 V688PXVW V888PXVM MAX4888A MAX4889A 5 0Gbps PCI Express Passive Switches Pin Description NAME FUNCTION MAX4888A MAX4889A 1 10 12 14 1 4 10 14 17 20 25 27 19 21 39 41 2 9 SEL Digital Control Input GND Ground No Connection Not internally connected 3 9 N C Analog Switch 1 Common Positive Terminal Analog Switch 1 Common Negative Terminal 6 6 COV2 Analog Switch 2 Common Positive Terminal 5 8 13 18 Positive Supply Voltage Input Connect V to 1 65 to 3 6V supply voltage 20 30 Bypass V to GND with a 0 1uF capacitor placed as close to the device as possible 40 42 See the Board Layout section 8 11 13 19 26 28 15 31 Analog Switch 2 Normally Open Negative Terminal y Open Positive T y Open Negative T y Open Positive T NC2 Ana i y Closed Negative Terminal NC2 Ana i y Closed Positive Terminal NC1 Ana i y Closed Negative Terminal Ana itch 1 Normally Closed Positive T itch 3 Common Positive Terminal itch 3 Common Negative Terminal itch 4 Common Positive Terminal COM4 itch 4 Common Negative Terminal NO4 Ana itch 4 Normally Open Negative Terminal NO4 Ana itch 4 Normally Open Positive Terminal NO3 Ana i y Open Positive Terminal
11. T EXCEED 008mm SHALL NOT EXCEED 010mm AVIAXL VI MARKING IS FOR PACKAGE ORIENTATION PURPOSE ONLY LEAD CENTERLINES TO BE AT DEFINED BY DIMESIDN e 005 PACKAGE DUTLINE 42L THIN QFN 3 5x9x0 8mm APPROVAL DOCUMENT CONTROL NO REV gt DRAWING NOT TO SCALE 21 0181 B Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied 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 2007 Maxim Integrated Products MAXIM is registered trademark of Maxim Integrated Products Inc
12. TERMINAL ON EACH SWITCH ON LOSS IS MEASURED BETWEEN COM_ AND ON NO_ OR TERMINAL ON EACH SWITCH CROSSTALK IS MEASURED BETWEEN ANY TWO PAIRS SIGNAL DIRECTION THROUGH SWITCH IS REVERSED WORST VALUES ARE RECORDED Figure 3 On Loss Off Isolation and Crosstalk V MAXIM MAX4888A MAX4889A SEL CAPACITANCE METER Figure 4 Channel Off On Capacitance Detailed Description The MAX4888A MAX4889A high speed passive switch es route PCle data between two possible destinations The MAX4888A MAX4889A are ideal for routing PCle sig nals to change the system configuration For example in a graphics application the MAX4888A MAX4889A create MAAKLM 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 oper ate 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 PCle sig nals to a maximum of V 1 2V Signals on the COM_ channels are routed to either the NO_ or NC_ chan nels and
13. ecification 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 CrossFire is a trademark of ATI Technologies Inc SLI is a trademark of NVIDIA Corporation AVLAZCLA DATA DIRECTION MAXIM MAX4888A ONE LANE MAX4889A DATA IS ROUTED NOTE ONLY ONE LANE IS SHOWN FOR CLARITY TO EITHER BOARD A OR B Figure 5 The MAX4888A MAX4889A Used as a Single Lane Switch V688PXVW V888PXVIW Chip Information PROCESS CMOS MAX4888A MAX4889A 5 0Gbps PCI Express Passive Switches 12 PCle BU LANE Typical Application Circuit PCle GRAPHICS INTERFACE GRAPHICS GRAPHICS CARD 1 CARD 2 MAXIM MAX4889A CHANNEL SELECT MAXIM MAX4889A CHANNEL SELECT MAXIM 5 0Gbps PCI Express Passive Switches 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 Ha e DAP SIZE 24 44 s z a 20x gt eeoa gt NE 1 _ T 1 e gt e A MARKING 2 SIDE VIEW BOTTOM VIEW ND 1 xe PPpALLAS
14. 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 V688PXVW V888PXVM MAX4888A MAX4889A 5 0Gbps PCI Express Passive Switches Functional Diagrams Truth Table MAXIM MAXIM MAX4888A MAX4889A COM TOj COM TO NC NO ON 10 MAXIM 5 0Gbps PCI Express Passive Switches Applications Information PCle Switching The MAX4888A MAX4889A primary applications are aimed at reallocating PCle 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 PCle bus into two 8 lane buses Two of the more promi nent 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 design controlled impedance PCB traces as short as possible or follow impedance layouts per the PCle sp
Download Pdf Manuals
Related Search