MAX4928A/MAX4928B + + 19-4030 Rev 1 8/08 DisplayPort/PCIe Passive Switches General Description Features The MAX4928A/MAX4928B high-speed passive switch- Single +3.3V Power Supply Voltage es route PCI Express (PCIe) data and/or DisplayPort signals between two possible destinations in desktop or Supports PCIe Gen I, Gen II, and DisplayPort laptop PCs. The MAX4928A is intended to be used with Data Rates > 5Gbps the ATX form factor desktop PCs, while the MAX4928B Excellent Return Loss > 12dB at 2.5GHz is expected to be used in the BTX form factor. The MAX4928A/MAX4928B are hex double-pole/dou- Six Bidirectional Pairs of Switches ble-throw (6 x DPDT) switches. The MAX4928A/ All Switching in One Device MAX4928B feature a single digital control input (SEL) to switch signal paths and a latch input (LE) that holds the Low 850A (max) Supply Current switches in a given state. Small 5mm x 11mm, 56-Pin TQFN Package The MAX4928A/MAX4928B are fully specified to oper- ate from a single +3.3V (typ) power supply. The Industry-Standard Pinouts MAX4928A/MAX4928B are available in an industry standard 5mm x 11mm, 56-pin TQFN package. Both Ordering Information devices operate over the -40C to +85C extended PART TEMP RANGE PIN-PACKAGE temperature range. MAX4928AETN+ -40C to +85F 56 TQFN-EP Applications MAX4928BETN+ -40C to +85F 56 TQFN-EP Desktop PCs +Denotes a lead-free package/RoHS-Compliant package. Notebook PCs EP = Exposed paddle. PCI Express is a registered trademark of PCI-SIG. DisplayPort is a trademark of Video Electronics Standards Typical Operating Circuit appears at end of data sheet. Association (VESA). Pin Configurations TOP VIEW 56 55 54 53 52 51 50 49 56 55 54 53 52 51 50 49 GND 1 48 GND 1 48 GND GND IN0+ 2 47 TX2+ SEL 2 47 D2+ IN0- 3 46 LE 46 TX2- 3 D2- IN1+ 4 45 TX3+ IN0+ 4 45 D3+ IN1- 44 IN0- 5 TX3- 5 44 D3- V 6 43 D0+ V 6 43 TX0+ DD DD IN2+ IN1+ 7 42 D0- 7 42 TX0- IN2- 8 41 D1+ IN1- 8 41 TX1+ IN3+ 9 IN2+ 9 40 D1- 40 TX1- 10 10 IN3- 39 D2+ IN2- 39 TX2+ GND 11 38 GND MAX4928A D2- 11 MAX4928B 38 TX2- 12 12 OUT+ 37 D3+ IN3+ 37 TX3+ OUT- 13 36 IN3- 13 D3- 36 TX3- X+ 14 35 GND OUT+ 14 35 GND X- 15 34 OUT- VDD 15 34 V DD GND 16 33 RX0+ GND 16 33 AUX+ V 32 V DD 17 RX0- DD 17 32 AUX- SEL 18 31 RX1+ X+ 18 31 HPD1 LE 19 30 X- 19 RX1- 30 HPD2 *EP *EP GND 20 29 GND GND 20 29 GND 21 22 23 24 25 26 27 28 21 22 23 24 25 26 27 28 *CONNECT EXPOSED PADDLE TO GND. TQFN TQFN Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. GND GND V V DD DD HPD2 TX0+ HPD1 TX0- AUX- TX1+ AUX+ TX1- VDD VDD GND GND GND GND V V DD DD RX1- D0+ RX1+ D0- RX0- D1+ RX0+ D1- V V DD DD GND GNDDisplayPort/PCIe Passive Switches ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) Peak Current (LE, SEL) V ...........................................................................-0.3V to +4V (pulsed at 1ms, 10% duty cycle)..................................70mA DD LE, SEL, IN , X , OUT , D , TX , HPD , RX , AUX Continuous Power Dissipation (T = +70C) for Multilayer Board A (Note 1) ...............................................-0.3V to + (V + 0.3V) 56-Pin TQFN (derate 41.0mW/C above +70C) .......3279mW DD V - V , V - V , V - V , V - V , Operating Temperature Range ...........................-40C to +85C IN TX IN D X HPD X RX1 V - V , V - V (Note 1)...................0 to +2V Junction Temperature......................................................+150C OUT AUX OUT RX0 Continuous Current (IN to D /TX , X to HPD /RX1 , Storage Temperature Range .............................-65C to +150C OUT to AUX /RX0 .....................................................70mA Package Junction-to-Ambient Thermal Resistance ( ) JA Peak Current (IN to D /TX , X to HPD /RX1 , OUT to (Note 2) .....................................................................24.4C/W AUX /RX0 ) (pulsed at 1ms, 10% duty cycle) .............70mA Package Junction-to-Case Thermal Resistance ( ) JC Continuous Current (LE, SEL)...........................................30mA (Note 2) .......................................................................1.5C/W Lead Temperature (soldering).........................................+300C Note 1: Signals on IN , X , OUT , D , TX , HPD , RX , or AUX , LE, SEL exceeding V or GND are clamped by internal diodes. DD 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 4-layer board. For detailed information on package thermal considerations, see 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 (V = +3.3V 10%, T =T to T , unless otherwise noted. Typical values are at V = +3.3V, T = +25C, unless otherwise DD A MIN MAX DD A noted.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ANALOG SWITCH IN , X , OUT , (V - DD Analog Signal Range D , TX , HPD , -0.1 V 1.8) RX , AUX V - V , IN TX V - V , IN D Voltage Between IN and D/TX, X V - V , X HPD 01.8V and HPD/RX1, and OUT and V - V , X RX1 AUX/RX0 V - OUT V , AUX V - V OUT RX0 I = I = I = 15mA, V , V , IN X OUT D TX On-Resistance R 8 ON V , V , or V = 0V, +1.2V HPD AUX RX V = + 3.0V , I = I = I = 15m A, D D I N X OUT On-Resistance Match R V , V , V , V , or V = 0V 0.1 2 ON D T X H P D A U X R X Between Pairs of Same Channel ( N otes 4, 5) V = + 3.0V , I = I = I = 15m A, D D I N X OUT On-Resistance Match R V , V , V , V , or V = 0V 1.5 4 ON D T X H P D A U X R X Between Channels ( N otes 4, 5) V = + 3.0V , I = I = I = 15m A, D D I N X OUT On-Resistance Flatness R V , V , V , V , or V = 0V, 0.3 1.5 FLAT(ON) D T X H P D A U X R X + 1.2V ( N otes 5, 6) 2 MAX4928A/MAX4928B