19-5952; Rev 1; 3/12 EVALUATION KIT AVAILABLE MAX14972 Dual SuperSpeed USB 3.0 Equalizer/Redriver General Description The MAX14972 dual SuperSpeed USB 3.0 equalizer/ redriver utilizes programmable input equalization and output deemphasis to reduce deterministic jitter and restore signal loss caused by circuit-board or signalcable losses, and allows optimal placement of key SuperSpeed USB 3.0 components and longer circuitboard traces or cables. The device features advanced power management with receiver detection and explicit support for USB 3.0 low-frequency periodic signals (LFPS). The device is available in a small, 24-pin (4.0mm x 4.0mm) TQFN package with flow-through traces for optimal layout and minimal space requirements. The device is specified over the 0NC to +70NC commercial operating temperature range. Applications USB Ports USB Hubs Notebook Computers Benefits and Features S Innovative Design Eliminates Need for Costly External Components Single +3.3V Supply Operation S Advanced Power Management for Maximum Efficiency 1mW (typ) in Standby State 23mW (typ) in Receiver Detect State 82.5mW (typ) in Dynamic Power-Down State 304mW (typ) in Active State S High Level of Integration for Performance Very Low Latency with 250ps (typ) Propagation Delay 10dB (typ) Input/Output Return Loss Up to 2.5GHz Three-Level Programmable Input Equalization Six-Level Programmable Output Deemphasis Explicit LFPS Support with Frequency Shaping SuperSpeed USB 3.0-Compliant Receiver Detection Low-Voltage (1.8V) Compatible Controls Excellent Jitter and Loss Compensation Capability > 40in of 4mil Microstrip S Ideal for Space-Sensitive Applications On-Chip 50I Input/Output Terminations 24-Pin, 4.0mm x 4.0mm TQFN Packaging 8kV HBM ESD Protection on All Pins Pin-to-Pin Compatible with TI SN65LVPE502 and TI SN65LVPE502CP Desktop Computers Docking Stations Industrial USB Switching Ordering Information appears at end of data sheet. Typical Operating Circuit VCC REMOTE BOARD MAIN BOARD 0.1F 100nF (X7R) TX+ 100nF (X7R) RX1+ TX1+ RX1- TX1- 100nF (X7R) TXUSB 3.0 HOST SINGLE DIFFERENTIAL PAIR RX- MAX14972 TX2+ 100nF (X7R) TX+ RX2+ SINGLE DIFFERENTIAL PAIR 100nF (X7R) RX- RX+ 100nF (X7R) 100nF (X7R) RX+ MIDPLANE TX2- GND USB 3.0 DEVICE 100nF (X7R) TX- RX2- CONNECTORS Maxim Integrated Products1 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. MAX14972 Dual SuperSpeed USB 3.0 Equalizer/Redriver ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) VCC ...................................................................... -0.3V to +4.0V All Other Pins (Note 1) ............................ -0.3V to (VCC + 0.3V) Continuous Current RX_+, RX_-, TX_+, TX_-.................. Q30mA Continuous Power Dissipation (TA = +70NC) TQFN (derate 27.8mW/NC above +70NC) ............. 2222.2mW Operating Temperature Range ............................ 0NC to +70NC Junction Temperature Range ......................... -40NC to +150NC Storage Temperature Range .......................... -65NC to +150NC Lead Temperature (soldering, 10s) ................................+300NC Soldering Temperature (reflow) ......................................+260NC Note 1: All I/O pins are clamped by internal diodes. 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 (qJA).......... 36NC/W Junction-to-Case Thermal Resistance (qJC)..................3NC/W Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (VCC = +3.0V to +3.6V, CC = 100nF coupling capacitor on each output, RL = 50I and CL = 1pF on each output, TA = 0NC to +70NC, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25NC.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 3.0 V DC PERFORMANCE Power-Supply Range Operating Supply Current Standby Supply Current VCC ICC ISTBY 3.3 3.6 ENRXD = 1, data rate = 5.0Gbps, D10.2 pattern, DE_ = VCC, OS_ = GND 92 125 ENRXD = 1, CM = 0, no output termination 7 10 Dynamic power-down mode, ENRXD = 1, CM = 0, with output termination, no input signal 25 32 ENRXD = 0 mA 500 FA Differential Input Impedance ZRX-DC-DIFF DC 72 120 I Differential Output Impedance ZTX-DC-DIFF DC 72 120 I Single-Ended High Input Impedance ZRX-SE-HIGH No output termination, CM = 0 (Note 3) 25 50 kI Common-Mode Input Impedance ZRX-DC-CM (Note 3) 18 30 I Common-Mode Output Impedance ZTX-DC-CM (Note 4) 18 30 I Common-Mode Input Voltage VRX-DC-CM (Note 3) 0 V Common-Mode Output Voltage VTX-DC-CM (Note 3) 2.75 V Active LFPS Common-Mode Delta DVLFPS-CM Active LFPS squelched and not squelched 50 mV Maxim Integrated Products2 MAX14972 Dual SuperSpeed USB 3.0 Equalizer/Redriver ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.0V to +3.6V, CC = 100nF coupling capacitor on each output, RL = 50I and CL = 1pF on each output, TA = 0NC to +70NC, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25NC.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 1200 mVP-P 300 mV AC PERFORMANCE (Note 5) Redriver-Operation Differential Input Signal Range LFPS Detect Threshold VRX-DIFF-PP USB 3.0 data 150 VLFPS-DIFF-PP USB 3.0 data 100 50MHz P f < 1250MHz 16 18 1250MHz P f < 2500MHz 8 12 50MHz P f < 1250MHz 13 16 1250MHz P f < 2500MHz 8 10 Differential Input Return Loss RLRX-DIFF Differential Output Return Loss RLTX-DIFF Common-Mode Input Return Loss RLRX-CM 50MHz P f < 2500MHz 11 13 dB Common-Mode Output Return Loss RLTX-CM 50MHz P f < 2500MHz 11 13 dB Differential Output Amplitude (Transition Bit), Figure 1 Differential Output Amplitude (Nontransition Bit), Figure 1 LFPS Idle Differential Output Voltage VTX-DIFF-TB-PP OS_ = 0, DE_ = 0 1120 OS_ = 0, DE_ = N.C. 940 OS_ = 0, DE_ = 1 1210 OS_ = 1 or N.C., DE_ = 0 1180 OS_ = 1 or N.C., DE_ = N.C. 1010 OS_ = 1 or N.C., DE_ = 1 1270 DE_ = N.C. 640 VTX-DIFF-NTB-PP DE_ = 0 840 DE_ = 1 940 VLFPS-IDLEDIFF -PP dB dB mVP-P mVP-P Highpass filter to remove DC offset 30 mV Voltage Change to Allow Receiver Detect VDETECT Positive voltage to sense receiver termination 500 mV Deterministic Jitter tTX-DJ-DD K28.5 pattern, data rate = 5.0Gbps, EQ_ = not connected 12 psP-P Random Jitter tTX-RJ-DD K28.5 pattern, data rate = 5.0Gbps, EQ_ = not connected 1 psRMS Rise/Fall Time tTX-RISE-FALL Differential Propagation Delay LFPS Idle Entry Delay LFPS Idle Exit Delay tPD tIDLE-ENTRY tIDLE-EXIT (Note 6) Propagation delay input to output at 50% 40 ps 250 ps USB 3.0 LFPS pattern, active state 4 6 USB 3.0 LFPS pattern, active state 4 6 15.6 22.5 USB 3.0 LFPS pattern, dynamic powerdown state ns ns Maxim Integrated Products3 MAX14972 Dual SuperSpeed USB 3.0 Equalizer/Redriver ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.0V to +3.6V, CC = 100nF coupling capacitor on each output, RL = 50I and CL = 1pF on each output, TA = 0NC to +70NC, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25NC.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CONTROL LOGIC Input Logic-High VIH ENRXD, CM, EQ_, OS_, and DE_ Input Logic-Low VIL ENRXD, CM, EQ_, OS_, and DE_ VHYST ENRXD, CM, EQ_, OS_, and DE_ Input Logic Hysteresis 1.5 V 0.5 V 0.075 V 8 kV ESD PROTECTION HBM ESD Protection Note Note Note Note 3: 4: 5: 6: Human Body Model Measured with respect to ground. Measured with respect to VCC. Guaranteed by design, unless otherwise noted. Rise and fall times are measured using 20% and 80% levels. VTX-DIFF-NTB-PP VTX-DIFF-TB-PP DE(dB) = 20 log VTX-DIFF-NTB-PP VTX-DIFF-TB-PP Figure 1. Illustration of Output Deemphasis Maxim Integrated Products4 MAX14972 Dual SuperSpeed USB 3.0 Equalizer/Redriver Typical Operating Characteristics (VCC = 3.3V, TA = +25NC, EQ_ = N.C., using 5Gbps QK28.5 pattern, unless otherwise noted.) DE_ = N.C, OS_ = N.C or 1, VRX-DIFF-PP = 150mVP-P 200 0 -200 -400 -600 MAX14972 toc02 400 600 EYE DIAGRAM VOLTAGE (mV) MAX14972 toc01 600 EYE DIAGRAM VOLTAGE (mV) DE_ = N.C, OS_ = 0, VRX-DIFF-PP = 150mVP-P 400 200 0 -200 -400 -600 -200ps -100ps -150ps 0ps -50ps 200ps 100ps 50ps -200ps 150ps 100ps 50ps 200ps 150ps 200 0 -200 -400 -600 MAX14972 toc04 600 EYE DIAGRAM VOLTAGE (mV) MAX14972 toc03 EYE DIAGRAM VOLTAGE (mV) 400 0ps -50ps DE_ = N.C, OS_ = 0, VRX-DIFF-PP = 1200mVP-P DE_ = N.C, OS_ = N.C or 1, VRX-DIFF-PP = 1200mVP-P 600 -100ps -150ps 400 200 0 -200 -400 -600 -200ps -100ps -150ps -50ps 0ps 200ps 100ps 50ps 150ps -200ps -100ps -150ps -50ps 0ps 100ps 50ps 200ps 150ps Maxim Integrated Products5 MAX14972 Dual SuperSpeed USB 3.0 Equalizer/Redriver Typical Operating Characteristics (continued) (VCC = 3.3V, TA = +25NC, EQ_ = N.C., using 5Gbps QK28.5 pattern, unless otherwise noted.) DE_ = N.C, OS_ = 1, VRX-DIFF-PP = 150mVP-P USB 3.0 DEVICE COMPLIANCE FILTER DE_ = N.C, OS_ = 1, VRX-DIFF-PP = 150mVP-P USB 3.0 HOST COMPLIANCE FILTER 600mV 400mV 800mV 600mV 400mV 200mV 200mV 0mV 0mV -200mV -200mV -400mV -400mV -600mV -600mV -800mV -200ps -100ps -150ps 0ps -50ps -800mV -200ps 100ps 50ps MAX14972 toc06 MAX14972 toc05 800mV 150ps DIFFERENTIAL INPUT RETURN LOSS vs. FREQUENCY MASK -15 150ps -20 -25 -30 -35 -40 MAX14972 toc08 -10 100ps 50ps 0 DIFFERENTIAL OUTPUT RETURN LOSS (dB) -5 0ps -50ps DIFFERENTIAL OUTPUT RETURN LOSS vs. FREQUENCY MAX14972 toc07 DIFFERENTIAL INPUT RETURN LOSS (dB) 0 -100ps -150ps -5 -10 MASK -15 -20 -25 -30 -35 -40 0 0.5 1.0 1.5 FREQUENCY (GHz) 2.0 2.5 0 0.5 1.0 1.5 2.0 2.5 FREQUENCY (GHz) Maxim Integrated Products6 MAX14972 Dual SuperSpeed USB 3.0 Equalizer/Redriver EQ2 DE2 OS2 CM VCC TOP VIEW GND Pin Configuration 18 17 16 15 14 13 RX2+ 19 12 TX2+ RX2- 20 11 TX2- GND 21 10 GND 9 RX1+ 8 RX1- 7 N.C. MAX14972 TX1+ 22 TX1- 23 *EP + 1 2 3 4 5 6 VCC EQ1 DE1 OS1 ENRXD GND N.C. 24 TQFN *CONNECT EXPOSED PAD (EP) TO GND. Pin Description PIN NAME FUNCTION 1, 13 VCC Power-Supply Input. Bypass VCC to GND with 0.1FF and 2.2FF low-ESR capacitors in parallel as close as possible to the device. 2 EQ1 Three-State Input Equalization Control, Channel 1. Leave EQ1 unconnected for default state. 3 DE1 Three-State Transition Bit and Nontransition Bit Output Amplitude Control, Channel 1. Connect DE1 to VCC for default state. 4 OS1 Two-State Transition-Bit Output Amplitude Control, Channel 1. Connect OS1 to GND for default state. 5 ENRXD 6, 10, 18, 21 GND Ground 7, 24 N.C. No Connection. Not internally connected. 8 RX1- Inverting Input, Channel 1. AC-couple RX1- with a low-ESR 100nF capacitor. 9 RX1+ Noninverting Input, Channel 1. AC-couple RX1+ with a low-ESR 100nF capacitor. 11 TX2- Inverting Output, Channel 2. AC-couple TX2- with a low-ESR 100nF capacitor. 12 TX2+ Noninverting Output, Channel 2. AC-couple TX2+ with a low-ESR 100nF capacitor. 14 CM Active-High Enable. Drive ENRXD high or leave unconnected for normal operation. Drive ENRXD low to enter standby state. ENRXD has a 400kI (typ) pullup resistor to VCC. Active-High Compliance Mode Control. Drive CM high to force active state. Drive CM low or leave unconnected for normal operation. CM has a 400kI (typ) pulldown resistor to GND. Maxim Integrated Products7 MAX14972 Dual SuperSpeed USB 3.0 Equalizer/Redriver Pin Description (continued) PIN NAME FUNCTION 15 OS2 Two-State Transition-Bit Output Amplitude Control, Channel 2. Connect OS2 to GND for default state. 16 DE2 Three-State Transition Bit and Nontransition Bit Output Amplitude Control, Channel 2. Connect DE2 to VCC for default state. 17 EQ2 Three-State Input Equalization Control, Channel 2. Leave EQ2 unconnected for default state. 19 RX2+ Noninverting Input, Channel 2. AC-couple RX2+ with a low-ESR 100nF capacitor. 20 RX2- Inverting Input, Channel 2. AC-couple RX2- with a low-ESR 100nF capacitor. 22 TX1+ Noninverting Output, Channel 1. AC-couple TX1+ with a low-ESR 100nF capacitor. 23 TX1- Inverting Output, Channel 1. AC-couple TX1- with a low-ESR 100nF capacitor. -- EP Exposed Pad. Internally connected to GND. Connect to a large ground plane to maximize thermal performance. Not intended as an electrical connection point. Functional Diagram VCC RX1+ MAX14972 TX1+ RX1- TX1- TX2- RX2- TX2+ RX2+ CONTROL LOGIC GND OS1 OS2 EQ1 EQ2 DE1 DE2 ENRXD CM Maxim Integrated Products8 MAX14972 Dual SuperSpeed USB 3.0 Equalizer/Redriver Detailed Description The MAX14972 features two identical drivers to support a complete single SuperSpeed USB 3.0 link. Programmable equalization and deemphasis on each channel allows for optimal board placement of SuperSpeed transceivers and enables flexibility of front, rear, and side SuperSpeed ports. The device features advanced power management with receiver detection and support for USB 3.0 low-frequency periodic signals (LFPS). Programmable Input Equalization Input equalization for channel 1 is controlled by EQ1, while input equalization for channel 2 is controlled by EQ2. Each of the two pins, EQ1 and EQ2, has three equalization settings, which offer flexible compensation for varied input circuit-board trace, connector, or cable losses (Table 1). The EQ_ three-state inputs interpret voltages below VIH and higher than VIL as high impedance. Set EQ_ to 1V, for example, or leave unconnected if the impedance state is required. Programmable Output Deemphasis Channel 1 output transition bit amplitude is controlled by the OS1 and DE1 pins, and the nontransition bit amplitude is controlled only by the DE1 pin. Channel 2 output transition bit amplitude is controlled by the OS2 and DE2 pins, and the nontransition bit amplitude is Table 1. Typical Input Equalization EQ_ EQUALIZATION (dB) N.C.* 0 0 6 1 10 *Not connected. controlled only by the DE2 pin. There are six possible output deemphasis states for each of the two channels, which offer flexibility to compensate for varied losses in the output circuit-board traces, connectors, or cables runs (Table 2, Table 3, and Table 4.) The DE_ three-state input interprets voltages below VIH and higher than VIL as high impedance. Set DE_ to 1V, for example, or leave unconnected if a high-impedance state is required. LFPS Support The device explicitly supports USB 3.0 LFPS by detecting an idle state at the input and squelching the corresponding output to prevent unwanted noise from being redriven. When the differential input LFPS signal falls below the 100mVP-P threshold, the device squelches the output. When a differential LFPS signal above 300mVP-P (typ) is present at the input, the device turns on the corresponding output and redrives the signal. The device features an LFPS idle entry time of 4ns (typ) and exit time of 4ns (typ) in the active state. Advanced Power Management Standby State Drive ENRXD low to place the device into a low-power standby state. In standby, the inputs are in a commonmode high-impedance state and the device consumes less than 1mW (typ) of power. The entry time to standby is 2Fs (typ), and the exit time is 50Fs (typ). Table 3. Typical Output Nontransition Bit Amplitude DE_ AMPLITUDE (mVP-P) N.C* 640 0 840 1 940 *Not connected. Table 2. Typical Output Transition Bit Amplitude (Refer to the Electrical Characteristics Table) Table 4. Typical Output Deemphasis CONTROL LOGIC OS_ = 0 OS_ = 1, N.C.* DE_ = 0 -2.5dB -3.0dB OS_ AMPLITUDE (mVP-P) DE_ = N.C. -3.3dB -3.9dB N.C.*, 1 1010 to 1270 DE_ = 1 -2.2dB -2.7dB 0 940 to 1210 *Not connected. *Not connected. Maxim Integrated Products9 MAX14972 Dual SuperSpeed USB 3.0 Equalizer/Redriver Receiver Detection The device features independent receiver detection on each channel. Upon initial power-up, if ENRXD is high, receiver detection initializes. If the device is in a powered-up state, the receiver detection is initiated on the rising edge of ENRXD. During receiver detection, the part remains in low-power mode 23mW (typ) and the outputs and inputs are in a common-mode high-impedance state. The receiver detection repeats every 12ms (typ) until the receiver is detected. The receiver must be detected on both channels to exit the receiver detection state. Dynamic Power-Down The device enters dynamic power-down state when a receiver has been detected and no signal is present at the input. The device exits this state when a signal is detected at the input. The device consumes less than 82.5mW (typ) power in dynamic power-down state. The device enters dynamic power-down after 30Fs idle detection. If no signal is detected for more than 12ms (typ), the part enters receiver detection state. Active State The device automatically enters active state after a receiver is detected and an input signal is present. The part can be forced into the active state by setting CM = 1 as shown in Table 5. The device consumes less than 304mW (typ) of power in this state. USB 3.0 Compliance Mode The MAX14972 features a USB 3.0 compliance mode that forces the device to remain in the active state. The device redrives signals to test the transmitter for voltage and timing specifications compliance as required by USB 3.0 specifications. Drive ENRXD high or leave unconnected, and CM high to activate USB 3.0 compliance mode. Drive ENRXD high or leave unconnected, and CM low or leave unconnected for normal operation (Table 5). Receiver detection and dynamic power-down are disabled in compliance mode (CM = 1), while the part remains in the active state with functional LFPS support. Applications Information Layout Circuit-board layout and design can significantly affect the performance of the device. Use good high-frequency design techniques, including minimizing ground inductance and using controlled-impedance transmission lines on data signals. Power-supply decoupling capacitors must be placed as close as possible to VCC. Always connect VCC to a power plane. Exposed-Pad Package The exposed pad, 24-pin TQFN package incorporates features that provide a very low thermal resistance path for heat removal from the IC. The exposed pad on the device must be soldered to the PCB ground plane for proper electrical and thermal performance. For more information on exposed-pad packages, refer to Application Note 862: HFAN-08.1: Thermal Considerations of QFN and Other Exposed-Paddle Packages. Power-Supply Sequencing Caution: Do not exceed the absolute maximum ratings because stresses beyond the listed ratings may cause permanent damage to the device. Proper power-supply sequencing is recommended for all devices. Always apply GND then VCC before applying signals, especially if the signal is not current limited. Ordering Information Table 5. Digital Control Truth Table ENRXD CM 0 0 Power-Down 0 1 Power-Down 1 or N.C.* DESCRIPTION 0 or N.C.* Normal Operation 1 or N.C.* 1 Compliance Mode (Active) PART MAX14972CTG+ TEMP RANGE PIN-PACKAGE 0NC to +70NC 24 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. *Not connected. Maxim Integrated Products10 MAX14972 Dual SuperSpeed USB 3.0 Equalizer/Redriver Package Information Chip Information PROCESS: BiCMOS 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. 24 TQFN-EP T2444+3 21-0139 90-0021 Maxim Integrated Products11 MAX14972 Dual SuperSpeed USB 3.0 Equalizer/Redriver Revision History REVISION NUMBER REVISION DATE 0 10/11 Initial release -- 1 3/12 Updated Electrical Characteristics table 14 DESCRIPTION PAGES CHANGED 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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2012 Maxim Integrated Products 12 Maxim is a registered trademark of Maxim Integrated Products, Inc.