19-4148; 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 +3.3V Power-Supply Voltage 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 operate 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. ♦ Small 3.5mm x 9.0mm, 42-Pin TQFN Package ♦ 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 ♦ Industry-Standard Pinouts Applications Ordering Information Desktop PCs PART TEMP RANGE PIN-PACKAGE Notebook PCs MAX4889BETO+ -40°C to +85°C 42 TQFN-EP* Servers MAX4889CETO+ -40°C to +85°C 42 TQFN-EP* Video Graphics Cards—SLI® (Scaled Link Interface) and CrossFire™ +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. PCI Express is a registered service mark of PCI-SIG Corporation. SLI is a registered trademark of NVIDIA Corporation. Typical Operating Circuit appears at end of data sheet. CrossFire is a trademark of ATI Technologies, Inc. Pin Configuration GND DOUTA- DOUTA+ GND VCC COUTA- COUTA+ GND SEL VCC BOUTA- BOUTA+ VCC GND AOUTA- AOUTA+ GND TOP VIEW 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 VCC VCC 39 GND 40 *EP GND 42 20 GND MAX4889B MAX4889C VCC 41 19 VCC 18 GND 8 9 10 11 12 13 14 15 16 17 AIN- AOUTB+ AOUTB- BIN+ BIN- BOUTB+ BOUTB- VCC CIN+ DOUTB- 7 DOUTB+ 6 DIN- 5 DIN+ 4 COUTB- 3 COUTB+ 2 CIN- 1 AIN+ + TQFN *CONNECT EXPOSED PAD TO GROUND. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX4889B/MAX4889C General Description 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_) .........................................................±70mA Peak Current (AIN_ to AOUTA_/AOUTB_, BIN_ to BOUTA_/BOUTB_, CIN_ to COUTA_/COUTB_, DIN_ to DOUTA_/DOUTB_) (pulsed at 1ms, 10% duty cycle)..............................±70mA Continuous Current (SEL).................................................±10mA Peak Current (SEL) (pulsed at 1ms, 10% duty cycle)..................................±10mA Continuous Power Dissipation (TA = +70°C) for multilayer board: 42-Pin TQFN (derate 35.7mW/°C above +70°C) .......2857mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Package Junction-to-Ambient Thermal Resistance (θJA) (Note 2) ............................................................28.0°C/W Package Junction-to-Case Thermal Resistance (θJC) (Note 2) ..............................................................2.0°C/W Lead Temperature (soldering, 10s) .................................+300°C Soldering Temperature (reflow) .......................................+260°C Note 1: Signals on SEL, _IN_, _OUTA_, _OUTB_ exceeding VCC or GND are clamped by internal diodes. Limit forward-diode current to maximum current rating. Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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 (VCC = +3.3V ±10%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS VCC 1.8 V DC PERFORMANCE Analog Signal Range _IN_, _OUTA_, _OUTB_ -0.3 R ON VCC = +3.0V, I_IN_ = 15mA, V_OUTA_, V_OUTB_ = 0V, 1.2V 6.4 8.4 On-Resistance Match Between Pairs of Same Channel RON VCC = +3.0V, I_IN_ = 15mA, V_OUTA_, V_OUTB_ = 0V (Notes 4, 5) 0.1 0.5 On-Resistance Match Between Channels RON VCC = +3.0V, I_IN_ = 15mA, V_OUTA_, V_OUTB_ = 0V (Notes 4, 5) 0.2 RFLAT (ON) VCC = +3.0V, I_IN_ = 15mA, V_OUTA_, V_OUTB_ = 0V, 1.2V (Notes 5, 6) 0.3 On-Resistance On-Resistance Flatness _OUTA_ or _OUTB_ Off-Leakage Current I_OUTA_ (OFF), VCC = +3.6V, V_IN_ = 0V, 1.2V, V_OUTA_ I_OUTB_ (OFF) or V_OUTB_ = 1.2V, 0V (MAX4889B) -1 +1 μA VCC = +3.6V, V_IN_ = 0V, 1.2V, V_OUTA_ or V_OUTB_ = V_IN_ or unconnected (MAX4889B) -1 +1 μA Output Short-Circuit Current All other ports are unconnected (MAX4889C) 5 15 μA Output Open-Circuit Voltage All other ports are unconnected (MAX4889C) 0.2 0.9 V _IN_ On-Leakage Current 2 I_IN_ (ON) 0.6 _______________________________________________________________________________________ 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.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS AC PERFORMANCE SEL-to-Switch Turn-On Time t ON_SEL ZS = ZL = 50 80 ns SEL-to-Switch Turn-Off Time t OFF_SEL 15 ns t PD ZS = ZL = 50, Figure 1 ZS = ZL = 50, Figure 2 50 ps Output Skew Between Pairs t SKEW1 ZS = ZL = 50, Figure 2 50 ps Output Skew Between Same Pair t SKEW2 ZS = ZL = 50, Figure 2 0Hz < f 2.8GHz 10 ps -14 Differential Return Loss (Note 5) SDD11 2.8GHz < f 5.0GHz -8 f > 5.0GHz -3 Differential Insertion Loss (Note 5) SDD21 Propagation Delay Differential Crosstalk (Note 5) Differential Off-Isolation (Note 5) SDDCTK SDD21_OFF dB See Table 1 dB 0Hz < f 2.5GHz -40 2.5GHz < f 5.0GHz -30 f > 5.0GHz -25 0Hz < f 2.5GHz -15 2.5GHz < f 5.0GHz -12 f > 5.0GHz -12 dB dB CONTROL INPUT (SEL) Input Logic High VIH Input Logic Low VIL Input Logic Hysteresis 1.4 V 0.6 VHYST 130 V mV POWER SUPPLY Power-Supply Range VCC VCC Supply Current ICC 3.0 VSEL = 0V or VCC 3.6 V 1 mA Note 3: 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 4: ΔRON = RON (MAX) - RON (MIN). Note 5: Guaranteed by design, not production tested. Note 6: Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. Table 1. Insertion Loss Mask FREQUENCY RANGE (GHz) MAXIMUM INSERTION LOSS (dB) 0–2.5 14 f GHz + 0.6 25 2.5–5 6 f GHz - 1.0 5 5 or greater 8 f GHz - 3.0 5 _______________________________________________________________________________________ 3 MAX4889B/MAX4889C ELECTRICAL CHARACTERISTICS (continued) 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. Switching Time 4 _______________________________________________________________________________________ 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. Propagation Delay and Output Skew _______________________________________________________________________________________ 5 MAX4889B/MAX4889C Test Circuits/Timing Diagrams (continued) 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. FREQUENCY VIL 60 50 40 30 20 tOFF_SEL 10 0 -2 DIFFERENTIAL INSERITON LOSS (dB) 1.1 tON_SEL 70 TURN-ON/-OFF TIME (ns) MAX4889B/9C toc04 VIH 90 80 1.0 3.2 3.3 3.4 3.5 3.1 3.2 3.3 3.4 3.5 -8 -10 MASK -12 -14 -16 MAX4889B MAX4889C 3.6 0 2 4 6 8 VCC (V) VCC (V) FREQUENCY (GHz) DIFFERENTIAL OFF-ISOLATION vs. FREQUENCY DIFFERENTIAL CROSSTALK vs. FREQUENCY DIFFERENTIAL RETURN LOSS vs. FREQUENCY -20 -25 -30 -35 -40 -20 -30 -40 -50 -60 -70 -45 -50 4 6 FREQUENCY (GHz) 8 10 MASK -10 -15 -20 -25 -30 -35 -80 2 -5 MAX4889B MAX4889C -40 0 2 4 6 FREQUENCY (GHz) 8 10 10 MAX4889B/9C toc09 -10 0 DIFFERENTIAL RETURN LOSS (dB) -15 MAX4889B/9C toc08 -10 0 DIFFERENTIAL CROSSTALK (dB) MAX4889B/9C toc07 0 -5 85 -6 -20 3.0 3.6 -4 -18 0 0.9 6 500 TEMPERATURE (°C) 1.2 0 VCC = +3.3V V_IN_ (V) 1.3 3.1 550 V_IN_ (V) 1.4 3.0 VCC = +3.6V 600 2 0 LOGIC THRESHOLD (V) 6 MAX4889B MAX4889C 650 MAX4889B/9C toc06 6.0 MAX4889B/9C toc05 RON (Ω) 6.5 700 SUPPLY CURRENT (μA) 7.5 VCC = +3.3V MAX4889B/9C toc02 VCC = +3.0V MAX4889B/9C toc01 8.0 SUPPLY CURRENT vs. TEMPERATURE ON-RESISTANCE vs. V_IN_ MAX4889B/9C toc03 ON-RESISTANCE vs. V_IN_ DIFFERENTIAL OFF-ISOLATION (dB) MAX4889B/MAX4889C 2.5/5.0/8.0Gbps PCIe Passive Switches 0 2 4 6 FREQUENCY (GHz) _______________________________________________________________________________________ 8 10 2.5/5.0/8.0Gbps PCIe Passive Switches VCC VCC MAX4889B MAX4889C AIN+ AOUTA+ AIN+ AOUTA+ AIN- AOUTA- AIN- AOUTA- AOUTB+ AOUTB+ AOUTB- AOUTB- BIN+ BOUTA+ BIN+ BOUTA+ BIN- BOUTA- BIN- BOUTA- BOUTB+ BOUTB+ BOUTB- BOUTB- CIN+ COUTA+ CIN+ COUTA+ CIN- COUTA- CIN- COUTA- COUTB+ COUTB+ COUTB- COUTB- DIN+ DOUTA+ DIN+ DOUTA+ DIN- DOUTA- DIN- DOUTA- DOUTB+ DOUTB+ DOUTB_IN_ TO _IN_ TO _OUTA_ _OUTB_ SEL 0 (DEFAULT) 1 ON OFF DOUTB- CONTROL CONTROL SEL SEL OFF ON GND GND _______________________________________________________________________________________ 7 MAX4889B/MAX4889C Functional Diagram/Truth Table 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. 8 BOUTB- Analog Switch 2. Normally Open Negative Terminal. 9, 19, 21, 26, 31, 34, 39, 41 VCC Positive Supply Voltage Input. Connect VCC to a 3.0V to 3.6V supply voltage. Bypass VCC to GND with a 0.1µF ceramic capacitor placed as close as possible to the device. See the Board Layout section. 10 CIN+ Analog Switch 3. Common Positive Terminal. 11 CIN- Analog Switch 3. Common Negative Terminal. 12 COUTB+ Analog Switch 3. Normally Open Positive Terminal. 13 COUTB- Analog Switch 3. Normally Open Negative Terminal. 14 DIN+ Analog Switch 4. Common Positive Terminal. 15 DIN- Analog Switch 4. Common Negative Terminal. 16 DOUTB+ Analog Switch 4. Normally Open Positive Terminal. 17 DOUTB- Analog Switch 4. Normally Open Negative Terminal. 18, 20, 22, 25, 29, 35, 38, 40, 42 GND 8 FUNCTION Ground 23 DOUTA- 24 DOUTA+ Analog Switch 4. Normally Closed Negative Terminal. Analog Switch 4. Normally Closed Positive Terminal. 27 COUTA- Analog Switch 3. Normally Closed Negative Terminal. 28 COUTA+ 30 SEL 32 BOUTA - 33 BOUTA+ Analog Switch 2. Normally Closed Positive Terminal. 36 AOUTA- Analog Switch 1. Normally Closed Negative Terminal. 37 AOUTA+ Analog Switch 1. Normally Closed Positive Terminal. — EP Analog Switch 3. Normally Closed Positive Terminal. Control Signal Input. SEL has a 70kΩ (typ) pulldown resistor to GND. Analog Switch 2. Normally Closed Negative Terminal. Exposed Pad. Connect EP to GND. _______________________________________________________________________________________ 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. The MAX4889C feature a 10µA (typ) source current and a 60kΩ (typ) internal biasing resistor to GND at the _OUT_ terminals. The MAX4889C is ideal for dual capacitively coupled applications such as SAS and SATA. The MAX4889B/ MAX4889C feature a single digital control input (SEL) to switch signal paths. SEL has a 70kΩ (typ) pulldown resistor to GND. The MAX4889B/MAX4889C are fully specified to operate from a single 3.0V to 3.6V power supply. Digital Control Input (SEL) The MAX4889B/MAX4889C provide a single digital control input (SEL) to select the signal path between the _IN_ and _OUT_ channels. The truth tables for the MAX4889B/MAX4889C are illustrated in the Functional Diagram/Truth Table. SEL has a 70kΩ (typ) pulldown resistor to GND. Applications Information PCIe Switching The MAX4889B/MAX4889C primary applications are aimed at reallocating PCIe lanes (see the Typical Operating Circuit: Video Graphics Cards). 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. Four MAX4889Bs permit a computer motherboard to operate properly with a single 16-lane graphics card, which can later be upgraded to dual cards. Board Layout High-speed switches require proper layout and design procedures for optimum performance. Keep controlledimpedance PCB traces as short as possible or follow impedance layouts per the PCIe specification. Ensure that power-supply bypass capacitors are placed as close as possible to the device. Multiple bypass capacitors are recommended. Connect all grounds and the exposed pad to large ground planes. Analog Signal Levels The MAX4889B/MAX4889C accept standard PCIe signals to a maximum of (VCC - 1.8V). Signals on the _IN+ channels are routed to either the _OUTA+ or _OUTB+ channels. Signals on the _IN- channels are routed to either the _OUTA- or _OUTB- channels. The MAX4889B/MAX4889C are bidirectional switches, allowing _IN_ and _OUT_ to be used as either inputs or outputs. _______________________________________________________________________________________ 9 MAX4889B/MAX4889C Detailed Description 2.5/5.0/8.0Gbps PCIe Passive Switches MAX4889B/MAX4889C Typical Operating Circuit: Video Graphics Cards CHANNEL SELECT PCIe GRAPHICS CONNECTOR 1 V CC PCIe NORTH BRIDGE PCIe GRAPHICS CONNECTOR 2 AOUTA+ SEL AOUTABOUTA+ BOUTA- AIN+ LANE 0 TX LANE 1 TX COUTA+ AIN- COUTA- BIN+ DOUTA+ BINCIN+ LANE 2 TX LANE 3 TX DOUTA- MAX4889B AOUTB+ CIN- AOUTB- DIN+ BOUTB+ DIN- BOUTBCOUTB+ COUTBDOUTB+ DOUTB- GND CHANNEL SELECT V CC AOUTA+ AOUTA- SEL BOUTA+ BOUTAAIN+ LANE 0 RX LANE 1 RX AIN- COUTA- BIN+ DOUTA+ BINCIN+ LANE 2 RX LANE 3 RX COUTA+ DOUTA- MAX4889B AOUTB+ CIN- AOUTB- DIN+ BOUTB+ DIN- BOUTBCOUTB+ COUTBDOUTB+ DOUTB- GND 10 ______________________________________________________________________________________ 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. 42 TQFN T423590M+1 21-0181 90-0079 ______________________________________________________________________________________ 11 MAX4889B/MAX4889C Package Information Chip Information 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. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.