19-4127; Rev 1; 6/11 USB 2.0 Hi-Speed Differential 8:1 Multiplexer The MAX4999 differential Hi-Speed USB analog multiplexer features low on-capacitance (CON) switching, making it an ideal solution for the USB server/mass storage market. The MAX4999 is designed for USB 2.0 low-/full-/Hi-Speed applications with capability of supporting data rates up to 480Mbps. The MAX4999 is a differential 8:1 multiplexer. The MAX4999 features three digital inputs to control the signal path. Typical applications include switching a USB connector between eight USB hosts and a USB device. An enable input (EN) is provided to disable all channels and place the device into a high-impedance state (standby mode), shutting off the charge pump for minimum power consumption. The MAX4999 operates from a +3.0V to +3.6V powersupply voltage and is specified over the -40C to +85C extended temperature range. The MAX4999 is available in a 5mm x 5mm, 32-pin TQFN package. Applications Keyboard, Video, Mouse (KVM) Servers/RAID Features o Single +3.0V to +3.6V Power-Supply Voltage o Low 6.5 (typ) On-Resistance (RON) o -3dB Bandwidth: 1200MHz (typ) o Enable Input Puts All Channels in HighImpedance State (Standby Mode) o Low Operating Current (1A) and Ultra-Low Quiescent Current (30nA) in Standby Mode o Low Threshold Eliminates the Need for Translators in 1.8V Low-Voltage Systems o Small 32-Pin, 5mm x 5mm, TQFN Package Ordering Information PART TEMP RANGE PIN-PACKAGE MAX4999ETJ+ -40C to +85C 32 TQFN-EP* +Denotes a lead-free package. *EP = Exposed pad. Mass Storage Workstations VCC D3_1 D3_0 GND 23 D4_1 24 GND D4_0 TOP VIEW GND Pin Configuration 22 21 20 19 18 17 D5_1 25 16 D2_1 D5_0 26 15 D2_0 GND 27 14 GND D6_1 28 13 D1_1 12 D1_0 11 GND 10 D0_1 9 D0_0 MAX4999 D6_0 29 GND 30 *EP D7_1 31 1 2 3 4 5 6 7 8 GND VCC EN COM0 COM1 C0 C1 C2 D7_0 32 TQFN 5mm x 5mm *CONNECT EXPOSED PAD TO GND. ________________________________________________________________ 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 MAX4999 General Description MAX4999 USB 2.0 Hi-Speed Differential 8:1 Multiplexer ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VCC ...........................................................................-0.3V to +4V All Other Pins (Note 1)..............................................-0.3V to +4V Continuous Current (COM_ to any switch) .......................60mA Peak Current (COM_ to any switch) (pulsed at 1ms, 10% duty cycle)..........................................................120mA Continuous Power Dissipation (TA = +70C) 32-Lead TQFN (derate 34.5mW/C above +70C) ....2759mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C Note 1: Signals exceeding GND are clamped by internal diodes. Limit forward-diode current to maximum current rating. 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. PACKAGE THERMAL CHARACTERISTICS (Note 2) TQFN Junction-to-Ambient Thermal Resistance (JA) ............29C/W Junction-to-Case Thermal Resistance (JC) ...............2.0C/W 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. ELECTRICAL CHARACTERISTICS (VCC = +3.0V to +3.6V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25C.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 3.6 V POWER SUPPLY Supply Voltage VCC Quiescent Supply Current IO 3.0 Charge pump on 5 Charge pump off 1 A ANALOG SWITCH On-Resistance RON ICOM_ = 10mA 6.5 12 On-Resistance Match RONSC VCOM_ = 1V, TA = +25C 0.8 On-Resistance Match Between Channels RONBC VCOM_ = 1V, TA = +25C 1 Leakage Current COM_, D_ _0, D_ _1 IL +1 A VCC = +3.6V -1 SWITCH AC PERFORMANCE (Note 4) Crosstalk VDCT1 Any switch to non-paired switch at 500MHz (Figure 3) -30 dB Off-Isolation VOFF Any switch to non-paired switch at 240MHz (Figure 3) -27 dB 1200 MHz Bandwidth -3dB BW On-Capacitance CON Off-Capacitance COFF RL = 45 unbalanced (Figure 3) f = 1MHz Taken from S11 parameters at f = 240MHz f = 1MHz, COM_ 6 3.0 5 Taken from S11 parameters at f = 240MHz 3.0 pF pF Propagation Delay tPD RL = RS = 50 (Figure 2) 300 ps Turn-On Time tON VD_ _0 or VD_ _1 = +1.5V, RL = 300, CL = 35pF, VIH = VCC, VIL = 0V (Figure 1) 10 s 2 _______________________________________________________________________________________ USB 2.0 Hi-Speed Differential 8:1 Multiplexer (VCC = +3.0V to +3.6V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25C.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN Turn-Off Time tOFF VD_ _0 or VD_ _1 = +1.5V, RL = 300, CL = 35pF, VIH = VCC, VIL = 0V (Figure 1) Output Skew Same Port tPD Skew between any D_ _0, D_ _1 line, same port 45 unbalanced I/O, f = 240MHz (Figure 2) Input Logic Low VIL VCC = +3.0V Input Logic High VIH VCC = +3.6V TYP MAX UNITS 10 s 30 ps SWITCH LOGIC Input Logic Hysteresis VHYST Input Leakage Current ILEAK 0.6 1.7 V 200 VCC = +3.6V, VCOM_ = 0V or VCC V mV -1 +1 A ESD PROTECTION All Pins Human Body Model 2 kV Note 3: All units are 100% production tested at TA = +85C. Limits over the operating temperature range are guaranteed by design and not production tested. Note 4: Guaranteed by design. Test Circuits/Timing Diagrams VCC MAX4999 VIN LOGIC INPUT COM_ D_ _0 OR D_ _1 50% VIL VOUT RL t OFF CL C_ VOUT GND LOGIC INPUT SWITCH OUTPUT CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VOUT = VIN RL + RON ( ) t R < 5ns t F < 5ns VIH 0.9 x V0UT 0.9 x VOUT 0V t ON IN DEPENDS ON SWITCH CONFIGURATION; INPUT POLARITY DETERMINED BY SENSE OF SWITCH. Figure 1. Switching Time _______________________________________________________________________________________ 3 MAX4999 ELECTRICAL CHARACTERISTICS USB 2.0 Hi-Speed Differential 8:1 Multiplexer MAX4999 Test Circuits/Timing Diagrams (continued) MAX4999 RS IN+ D0_1 COM1 OUT+ RL RS IN- D0_0 COM0 RISE-TIME PROPAGATION DELAY = tPLH. FALL-TIME PROPAGATION DELAY = tPHL. tSK = |tPLH - tPHL|. RS = RL = 50. OUTRL C0 C1 C2 VCC VIN+ 50% 50% 50% 50% 0V V+ VIN0V tPLH tR tPHL VCC tF 90% VOUT+ 90% 50% 50% 10% 0V 10% VCC 50% VOUT- 50% 0V tPHL tPLH Figure 2. Propagation Delay and Skew 4 _______________________________________________________________________________________ USB 2.0 Hi-Speed Differential 8:1 Multiplexer VCC 0.1F VIN V+ CHANNEL SELECT NETWORK ANALYZER 50 50 D_ _ _ C0 C1 C2 ON-LOSS = 20log MAX4999 VOUT HIGH EN OFF-ISOLATION = 20log COM_ MEAS. REF. CROSSTALK = 20log GND 50 VOUT VIN VOUT VIN VOUT VIN 50 MEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" USB_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" USB_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE USB_ CHANNEL TO ANOTHER USB_ CHANNEL. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. Figure 3. Off-Isolation, On-Loss, and Crosstalk _______________________________________________________________________________________ 5 MAX4999 Test Circuits/Timing Diagrams (continued) Typical Operating Characteristics (VCC = +3.3V, TA = +25C, unless otherwise noted.) RON () RON () 6.0 5.4 5.2 TA = +25C 5.5 TA = -40C 5.0 5.0 VCC = +3.6V 0.6 1.2 1.8 2.4 3.0 2.2 LOGIC THRESHOLD vs. SUPPLY VOLTAGE 0.88 0.75 VIL 0.80 60 -10 ON-RESPONSE -20 -30 85 CROSSTALK -40 -50 -60 -70 OFF-ISOLATION -80 0.75 0.63 35 FREQUENCY RESPONSE 0.90 0.85 10 0 MAGNITUDE (dB) 1.00 VIH 0.95 -15 -40 MAX4999 toc05 1.00 LOGIC THRESHOLD (V) VCC = +3.0V COM_ OFF-LEAKAGE TEMPERATURE (C) QUIESCENT SUPPLY CURRENT vs. TEMPERATURE VCC = +3.6V 40 3.3 VCOM_ (V) VCC = +3.3V 1.13 1.1 VCOM_ (V) 1.25 60 0 0 3.6 MAX4999 toc04 0 COM_ ON-LEAKAGE 80 20 4.0 4.6 VCC = +3.6V 100 4.5 4.8 MAX4999 toc03 6.5 5.6 120 MAX4999 toc06 VCC = +3.3V TA = +85C LEAKAGE CURRENT (nA) 5.8 VCC = +3.3V MAX4999 toc02 7.0 MAX4999 toc01 6.0 VCC = +3.0V LEAKAGE CURRENT vs. TEMPERATURE ON-RESISTANCE vs. VCOM_ ON-RESISTANCE vs. VCOM_ QUIESCENT SUPPLY CURRENT (A) MAX4999 USB 2.0 Hi-Speed Differential 8:1 Multiplexer -90 -100 0.70 0.50 -40 -15 10 35 60 85 3.0 3.2 3.5 3.6 1 10 EYE DIAGRAM - SINGLE MAX4999 toc07 100 FREQUENCY (MHz) SUPPLY VOLTAGE (V) TEMPERATURE (C) 6 3.3 EYE DIAGRAM - DOUBLE MAX4999 toc08 _______________________________________________________________________________________ 1000 10,000 USB 2.0 Hi-Speed Differential 8:1 Multiplexer PIN NAME 1, 11, 14, 17, 21, 24, 27, 30 FUNCTION GND Ground 2, 20 3 VCC EN Power-Supply Input. Bypass VCC to GND with a 0.1F capacitor placed as close to VCC as possible. Enable Input 4 COM0 5 COM1 6 7 C0 C1 Control Input 0 Control Input 1 8 C2 Control Input 2 9 D0_0 Analog Switch 0 D- Terminal 10 12 D0_1 D1_0 Analog Switch 0 D+ Terminal Analog Switch 1 D- Terminal 13 D1_1 Analog Switch 1 D+ Terminal 15 D2_0 Analog Switch 2 D- Terminal 16 18 D2_1 D3_0 Analog Switch 2 D+ Terminal Analog Switch 3 D- Terminal 19 D3_1 Analog Switch 3 D+ Terminal 22 D4_1 Analog Switch 4 D+ Terminal 23 25 D4_0 D5_1 Analog Switch 4 D- Terminal Analog Switch 5 D+ Terminal 26 D5_0 Analog Switch 5 D- Terminal 28 D6_1 Analog Switch 6 D+ Terminal 29 31 D6_0 D7_1 Analog Switch 6 D- Terminal Analog Switch 7 D+ Terminal 32 D7_0 -- EP Analog Switch Common D- Terminal Analog Switch Common D+ Terminal Analog Switch 7 D- Terminal Exposed Pad. Connect EP to GND or leave unconnected. Detailed Description The MAX4999 differential Hi-Speed USB analog multiplexer features low on-capacitance (CON) and low onresistance (R ON ) necessary for high-performance switching applications. The low CON is designed for USB server/mass storage devices. This device is ideal for USB 2.0 Hi-Speed applications at 480Mbps, while also meeting the requirements for USB low-/full-speed applications. Digital Control Inputs (C0, C1, C2) The MAX4999 provides three digital control inputs (C0, C1, C2) to select the analog signal path between the COM_ and D-/D+ channels. The truth table for the MAX4999 is shown in the Functional Diagram/Truth Table. Driving the control inputs rail-to-rail minimizes power consumption. Enable Input (EN) The MAX4999 features an enable input that when driven low, places the device in standby mode. In standby mode, all channels are high impedance and the internal charge pump is disabled, thus minimizing the quiescent supply current. For normal operation, drive EN high. Analog Signal Levels Signals applied to COM1 are routed to D_ _1 terminals. Signals applied to COM0 are routed to D_ _0 terminals. This multiplexer is bidirectional, allowing COM_ and D-/D+ terminals to be configured as either inputs or outputs. Additionally, the MAX4999 can be used for non-USB signals if the signals fall within the normal operating range. The MAX4999 features an internal charge pump that allows signal levels greater than the supply voltage. Limit the analog input/output signal level to no more than the Absolute Maximum Ratings. _______________________________________________________________________________________ 7 MAX4999 Pin Description USB 2.0 Hi-Speed Differential 8:1 Multiplexer MAX4999 Functional Diagram/Truth Table Applications Information Increasing USB Channels VCC MUX D0 _1 D1 _1 D2 _1 D3 _1 D4 _1 D5 _1 D6 _1 D7 _1 MUX D0 _0 D1 _0 D2 _0 D3 _0 D4 _0 D5 _0 D6 _0 D7 _0 MAX4999 COM1 COM0 The MAX4999 features an enable input that allows two MAX4999s to be connected, allowing multiplexing between 16 USB channels. Figure 4 shows the typical application with a single USB common terminal multiplexed to eight channels (8:1). See the Eye Diagram Single graph in the Typical Operating Characteristics. Figure 5 shows two MAX4999 devices configured with the USB common terminal multiplexed to 16 USB channels (16:1). See the Eye Diagram - Double graph in the Typical Operating Characteristics. The MAX4999 was designed to be symmetrical so that the two common ports may be wired in parallel with very short wiring to create a 16:1 configuration. When operating in 16:1 configuration, interchange COM0 and COM1 on the second device to reverse the D+ and D- pins. This minimizes vias and crossovers (Figure 5). USB Switching The MAX4999 analog multiplexers are fully compliant with the USB 2.0 specification. The low on-resistance and low on-capacitance of the MAX4999 make it ideal for high-performance switching applications. EN Board Layout C0 Hi-Speed switches require proper layout and design procedures for optimum performance. Keep design-controlled impedance PCB traces as short as possible. Ensure that high-quality bypass ceramic capacitors (X7R, X5R or better) are placed as close to the device as possible and use large ground planes where possible. CONTROL LOGIC C1 CHARGE PUMP C2 GND MAX4999 EN C2 C1 C0 1 0 0 0 COM_D0_ _ FUNCTION 1 0 0 1 COM_D1_ _ 1 0 1 0 COM_D2_ _ 1 0 1 1 COM_D3_ _ 1 1 0 0 COM_D4_ _ 1 1 0 1 COM_D5_ _ 1 1 1 0 COM_D6_ _ 1 1 1 1 COM_D7_ _ 0 X X X STANDBY MODE. ALL SWITCHES IN HIGHIMPEDANCE STATE. CHARGE PUMP IS OFF. X = DON'T CARE 8 _______________________________________________________________________________________ USB 2.0 Hi-Speed Differential 8:1 Multiplexer + - D5_1 D5_0 USB6 + - D6_1 D6_0 USB7 + - D7_1 D7_0 23 22 D3_0 D3_1 USB3 + - D4_1 D4_0 USB5 MAX4999 USB4 - + 19 18 25 26 16 15 28 29 13 12 MAX4999 31 32 10 9 D2_1 + USB2 - D2_0 D1_1 + USB1 - D1_0 D0_1 + USB0 - D0_0 +3.3V VCC 2, 20 4 5 3 6 7 8 1, 11, 14, 17, 21, 24, 27, 30 GND EN C0 C1 C2 - + COMMON Figure 4. The MAX4999 Multiplexes Between Eight Differential Channels (8:1) ONE PAIR SHOWN + - C2 C1 C0 EN0 EN1 D20 16 15 + 1 8 7 6 MAX4999 DEVICE 0 3 5 4 3 4 5 6 7 8 1 + MAX4999 DEVICE 1 15 16 D20 USB TYPE A COMMON + - USB D+, D- MUST BE REVERSED IF DEVICES ARE CONNECTED AS SHOWN, THIS IS TRUE OF D0_ _ TO D7_ _. C0, C1, C2 ARE CONNECTED IN PARALLEL. EN0 AND EN1 ARE USED TO SELECT BETWEEN DEVICE 0 AND DEVICE 1. Figure 5. Combining Two MAX4999 Devices for 16:1 USB Connections _______________________________________________________________________________________ 9 MAX4999 USB 2.0 Hi-Speed Differential 8:1 Multiplexer Package Information Chip Information PROCESS: CMOS 10 For the latest package outline information and land patterns (footprints), 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. 32 TQFN T3255+4 21-0140 90-0012 ______________________________________________________________________________________ USB 2.0 Hi-Speed Differential 8:1 Multiplexer REVISION NUMBER REVISION DATE 0 5/08 Initial release 1 6/11 Added Package Thermal Characteristics; renamed pins in Figure 4; changed pin references in Electrical Characteristics, Figures 3 and 5, TOCs, and Functional Diagram. DESCRIPTION PAGES CHANGED -- 2, 5, 6, 8, 9 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 (c) 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX4999 Revision History