19-5023; Rev 1; 11/10 TION KIT EVALUA BLE IL AVA A SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis The MAX4951BE dual-channel buffer is ideal to redrive serial ATA (SATA) I, SATA II, and SATA III signals and features high electrostatic discharge (ESD) Q8kV Human Body Model (HBM) protection. The MAX4951BE can be placed nearly anywhere on the motherboard to overcome board losses and produce an eSATA-compatible signal level. This device is SATA specification v.2.6 (gold standard)-compliant, while overcoming losses in the PCB and eSATA connector. The MAX4951BE features very low standby current for power-sensitive applications. This device features hardware SATA-drive cable detection, keeping the power low in standby mode. The device also features an independent channel, dynamic power-down mode where power consumption is reduced when no input signal is present. The MAX4951BE preserves signal integrity at the receiv er by reestablishing full output levels and can reduce the total system jitter (TJ) by providing input equalization. This device features channel-independent digital preemphasis controls to drive SATA outputs over longer trace lengths or to meet eSATA specifications. SATA Out-Of-Band (OOB) signaling is supported using highspeed OOB signal detection on the inputs and squelch on the corresponding outputs. Inputs and outputs are all internally 50I terminated and must be AC-coupled to the SATA controller IC and SATA device. The MAX4951BE operates from a single +3.3V (typ) supply, and is available in a small, 4mm x 4mm TQFN package with flow-through traces for ease of layout. This device is specified over the 0NC to +70NC operating temperature range. Features S Single +3.3V Supply Operation S Low-Power, 500A (typ) eSATA Cable Detect S Drive Detection S Dynamic Power Reduction Reduced Power Consumption in Active Mode S Fixed Input Equalization Permits Longer Traces Leading to the Device S Selectable Output Preemphasis Improved Output Eye S SATA I (1.5Gbps) and SATA II (3.0Gbps) Compliant S SATA III (6.0Gbps) Compliant S Supports eSATA Output Levels S Supports SATA OOB Signaling S OOB Detection: 8ns (max) S Internal Input/Output 50I Termination Resistors S Inline Signal Traces for Flow-Through Layout S Space-Saving, 4mm x 4mm TQFN Package with Exposed Pad S High ESD Protection on All Pins: 8kV (HBM) Ordering Information PART TEMP RANGE PIN-PACKAGE MAX4951BECTP+ 0NC to +70NC 20 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Applications Laptop Computers Servers Desktop Computers Docking Stations Data Storage/Workstations ________________________________________________________________ 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. MAX4951BE General Description MAX4951BE SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND unless otherwise noted.) VCC. ......................................................................-0.3V to +4.0V AINP, AINM, BINP, BINM, EN, CAD, PA, PB (Note 1)........................................-0.3V to (VCC +0.4V) Short-Circuit Output Current (BOUTP, BOUTM, AOUTP, AOUTM)............................ Q30mA Continuous Current at Inputs (AINP, AINM, BINP, BINM)............................................. Q5mA Continuous Power Dissipation (TA = +70NC) TQFN (derate 25.6mW/NC above +70NC)...................2051mW ESD Protection on All Pins (HBM)........................................Q8kV Operating Temperature Range.............................. 0NC to +70NC Storage Temperature Range............................. -55NC to +150NC Lead Temperature (soldering, 10s).................................+300NC Soldering Temperature (reflow).......................................+260NC Note 1: All I/O pins are clamped by internal diodes. PACKAGE THERMAL CHARACTERISTICS (Note 2) TQFN Junction-to-Ambient Thermal Resistance (qJA)............39C/W Junction-to-Case Thermal Resistance (qJC)...................6C/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. 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 = +3.0V to +3.6V, CL = 12nF, RL = 50I, TA = 0NC to +70NC, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25NC.) (Note 3) PARAMETER SYMBOL Operating Power-Supply Range VCC Operating Supply Current ICC ISTBY Dynamic Power-Down Current IDYNPD Single-Ended Input Resistance ZRX-SE-DC Differential Input Resistance Single-Ended Output Resistance Differential Output Resistance ZRX-DIFFDC ZTX-SE-DC MIN TYP 3.0 MAX UNITS 3.6 V PA = PB = VCC; D10.2 pattern, f = 1.5Gbps 77 92 PA = PB = GND; D10.2 pattern, f = 1.5Gbps 62 76 Duty cycle is 25% active, 75% idle; D10.2 pattern Average Supply Current in Normal Operation Standby Supply Current CONDITIONS mA Preemphasis on 30 Preemphasis off 26 EN = GND or CAD = VCC 500 750 FA 14 20 mA Single-ended to VCC (Note 4) 40 50 (Note 4) 85 100 Single-ended to VCC (Note 4) 40 50 85 100 ZTX-DIFF-DC (Note 4) mA I 115 I I 115 I AC PERFORMANCE Differential Input Return Loss (Notes 4, 5) RLRX-DIFF f = 150MHz to 300MHz 18 f = 300MHz to 600MHz 14 f = 600MHz to 1200MHz 10 f = 1.2GHz to 2.4GHz 8 f = 2.4GHz to 3.0GHz 3 f = 3.0GHz to 5.0GHz 1 2 _______________________________________________________________________________________ dB SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis (VCC = +3.0V to +3.6V, CL = 12nF, RL = 50I, TA = 0NC to +70NC, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25NC.) (Note 3) PARAMETER Common-Mode Input Return Loss (Notes 4, 5) Differential Output Return Loss (Notes 4, 5) Common-Mode Output Return Loss (Notes 4, 5) Common-Mode to Differential Input Return Loss (Notes 4, 5) Common-Mode to Differential Output Return Loss (Notes 4, 5) SYMBOL RLRX-CM RLTX-DIFF RLTX-CM RLRX-CMDM RLTX-CMDM CONDITIONS 5 f = 300MHz to 600MHz 5 f = 600MHz to 1200MHz 2 f = 1.2GHz to 2.4GHz 1 f = 2.4GHz to 3.0GHz 1 f = 3.0GHz to 5.0GHz 1 f = 150MHz to 300MHz 14 f = 300MHz to 600MHz 8 f = 600MHz to 1200MHz 6 f = 1.2GHz to 2.4GHz 6 f = 2.4GHz to 3.0GHz 3 f = 3.0GHz to 5.0GHz 1 f = 150MHz to 300MHz 8 f = 300MHz to 600MHz 5 f = 600MHz to 1200MHz 2 f = 1.2GHz to 2.4GHz 1 f = 2.4GHz to 3.0GHz 1 f = 3.0GHz to 5.0GHz 1 f = 150MHz to 300MHz 30 f = 300MHz to 600MHz 20 f = 600MHz to 1200MHz 10 f = 1.2GHz to 2.4GHz 10 f = 2.4GHz to 3.0GHz 4 f = 3.0GHz to 5.0GHz 4 f = 150MHz to 300MHz 30 f = 300MHz to 600MHz 30 f = 600MHz to 1200MHz 20 f = 1.2GHz to 2.4GHz 10 f = 2.4GHz to 3.0GHz 4 f = 3.0GHz to 5.0GHz Differential Input Signal Range MIN f = 150MHz to 300MHz SATA I, SATA II (Note 4) 225 Differential Output Swing VTX-DFF-PP f = 750MHz (Note 4) PA = PB = GND 425 Output Preemphasis TX-DFF-PPf = 750MHz PEDB Preemphasis Time Period tPE Propagation Delay tPD MAX UNITS dB dB dB dB dB 4 VRX-DFF-PP Input Equalization TYP PA = PB = VCC 525 1600 mVP-P 625 mVP-P 2.8 dB VRX-DFF-PP = 300mVP-P, tIN,RISE/FALL = 20ps 2.7 dB f = 750MHz 150 ps 150 ps PA = PB = VCC _______________________________________________________________________________________ 3 MAX4951BE ELECTRICAL CHARACTERISTICS (continued) MAX4951BE SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.0V to +3.6V, CL = 12nF, RL = 50I, TA = 0NC to +70NC, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25NC.) (Note 3) PARAMETER Output Rise/Fall Time (Notes 5, 6) SYMBOL tR, tF CONDITIONS MIN TYP MAX PA = PB = GND SATA I/II (Note 7) 67 130 PA = PB = GND SATA III (Note 8) 40 68 Deterministic Jitter (Notes 5, 9) tTX-DJ-DD PA = PB = GND Random Jitter (Notes 5, 9) tTX-RJ-DD PA = PB = GND OOB Detector Threshold SATA OOB pattern, f = 750MHz OOB Output Startup/Shutdown Time (Note 10) UNITS ps 50 4 20 psP-P 1.5 psRMS 150 mVP-P 8 ns OOB Differential-Offset Delta rVOOB,DFF Difference between OOB and active-mode output offset -120 120 mV OOB Common-Mode Delta rVOOB,CM Difference between OOB and active common-mode voltage -15 +15 mV OOB Output Disable VOOB,OUT VIN < 50mVP-P, output voltage in squelch 30 mVP-P LOGIC INPUT Input Logic-High VIH Input Logic-Low VIL Input Logic Hysteresis VHYST Input Pullup Resistance RPU Input Pulldown Resistance RPD 1.4 V 0.6 Pin: CAD Pins: EN, PA, PB V 0.1 V 200 330 kI 200 330 kI Q8 kV ESD PROTECTION All Pins Note Note Note Note Note Note Note Note 3: 4: 5: 6: 7: 8: 9: 10: HBM All devices are 100% production tested at TA = +70C. All temperature limits are guaranteed by design. This specification meets SATA v.2.6, gold standard. Guaranteed by design. Rise and fall times are measured using 20% and 80% levels. For SATA 2.0, refer to SATA 2.6-Gold Specification, page 111, Figure 191. For SATA 3.0, refer to SATA Revision 3.0 Release Candidate, page 222, Figure 124. DJ measured using a K28.5 pattern; RJ measured using a D10.2 pattern. Total time for OOB detection circuit to enable/squelch the output. 4 _______________________________________________________________________________________ SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis VIN = 220mVP-P, 1.5Gbps, PA = 0, PB = 0 VIN = 220mVP-P, 3.0Gbps, PA = 0, PB = 0 0 -200 -600 -400 -200 0 200 400 200 0 -200 600 -300 -200 -100 200ps/div -200 200 400 600 0 -200 -300 -200 -100 0 100 200 300 0 -200 -400 200 400 600 100 150 0 -200 -100 -50 0 50 100 150 VIN = 220mVP-P, 6.0Gbps, PA = 1, PB = 1 MAX4951BE toc09 400 200 0 -200 -400 0 50 50ps/div EYE DIAGRAM VOLTAGE (200mV/div) EYE DIAGRAM VOLTAGE (200mV/div) 200 0 200 -150 400 200ps/div -50 MAX4951BE toc06 MAX4951BE toc08 400 -200 -100 VIN = 1600mVP-P, 6.0Gbps, PA = 0, PB = 0 VIN = 220mVP-P, 3.0Gbps, PA = 1, PB = 1 MAX4951BE toc07 EYE DIAGRAM VOLTAGE (200mV/div) -150 100ps/div VIN = 220mVP-P, 1.5Gbps, PA = 1, PB = 1 -400 -200 50ps/div 200 200ps/div -600 0 300 EYE DIAGRAM VOLTAGE (200mV/div) 0 0 200 MAX4951BE toc05 EYE DIAGRAM VOLTAGE (200mV/div) EYE DIAGRAM VOLTAGE (200mV/div) 200 -200 100 VIN = 1600mVP-P, 3.0Gbps, PA = 0, PB = 0 MAX4951BE toc04 -400 0 200 100ps/div VIN = 1600mVP-P, 1.5Gbps, PA = 0, PB = 0 -600 MAX4951BE toc03 EYE DIAGRAM VOLTAGE (200mV/div) 200 VIN = 220mVP-P, 6.0Gbps, PA = 0, PB = 0 MAX4951BE toc02 EYE DIAGRAM VOLTAGE (200mV/div) EYE DIAGRAM VOLTAGE (200mV/div) MAX4951BE toc01 200 0 -200 -400 -300 -200 -100 0 100ps/div 100 200 300 -150 -100 -50 0 50 100 150 50ps/div _______________________________________________________________________________________ 5 MAX4951BE Typical Operating Characteristics (TA = +25C, unless otherwise noted.) Typical Operating Characteristics (continued) (TA = +25C, unless otherwise noted.) VIN = 1600mVP-P, 1.5Gbps, PA = 1, PB = 1 VIN = 1600mVP-P, 3.0Gbps, PA = 1, PB = 1 MAX4951BE toc10 200 0 -200 400 EYE DIAGRAM VOLTAGE (200mV/div) EYE DIAGRAM VOLTAGE (200mV/div) 200 0 -200 -400 -600 -200 0 200 400 600 -200 -300 -200 -100 0 100 200 300 -150 -100 -50 0 50 100 150 100ps/div 50ps/div DIFFERENTIAL INPUT RETURN LOSS vs. FREQUENCY DIFFERENTIAL OUTPUT RETURN LOSS vs. FREQUENCY COMMON-MODE INPUT RETURN LOSS vs. FREQUENCY -5 MAGNITUDE (dB) -10 -15 -20 -25 0 -10 -10 MAGNITUDE (dB) -5 MASK -15 -20 -25 -30 -40 -35 1 2 3 4 5 MASK -20 -30 -40 -50 -30 -35 MAX4951BE toc15 0 MAX4951BE toc14 MASK 0 0 200ps/div MAX4951BE toc13 0 -400 200 -400 -60 0 1 2 3 4 5 0 1 2 3 4 5 FREQUENCY (GHz) FREQUENCY (GHz) FREQUENCY (GHz) COMMON-MODE OUTPUT RETURN LOSS vs. FREQUENCY COMMON-MODE TO DIFFERENTIAL INPUT RETURN LOSS vs. FREQUENCY COMMON-MODE TO DIFFERENTIAL OUTPUT RETURN LOSS vs. FREQUENCY -20 -25 -30 -20 MASK -30 -40 -50 -35 -45 0 1 2 3 FREQUENCY (GHz) 4 5 -10 -20 MASK -30 -40 -50 -60 -60 -40 MAX4951BE toc18 -10 MAGNITUDE (dB) -15 0 MAGNITUDE (dB) MASK -10 0 MAX4951BE toc16 0 -5 MAX4951BE toc17 EYE DIAGRAM VOLTAGE (200mV/div) MAX4951BE toc12 400 -400 MAGNITUDE (dB) VIN = 1600mVP-P, 6.0Gbps, PA = 1, PB = 1 MAX4951BE toc11 400 MAGNITUDE (dB) MAX4951BE SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis -70 -70 -80 0 1 2 3 FREQUENCY (GHz) 4 5 0 1 2 3 FREQUENCY (GHz) 6 _______________________________________________________________________________________ 4 5 SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis EYE HEIGHT (mV) 200 500 3Gbps 150 6Gbps 50 6Gbps, NONTRANSITION BITS 300 200 6Gbps, TRANSITION BITS 100 0 3Gbps, TRANSITION BITS 10 20 30 40 50 60 VIN = 1VP-P, 7.5in OF INPUT TRACE 120 100 6Gbps 80 60 3Gbps 40 20 0 0 0 0 10 20 30 40 50 60 0 5 10 15 20 25 30 LENGTH (in) EYE HEIGHT vs. OUTPUT LENGTH, PA = 0, PB = 0 (7.5in OF INPUT TRACE) DETERMINISTIC JITTER vs. OUTPUT LENGTH, PA = 1, PB = 1 EYE HEIGHT vs. OUTPUT LENGTH, PA = 1, PB = 1 (7.5in OF INPUT TRACE) 300 250 3Gbps, NONTRANSITION BITS 200 150 3Gbps, TRANSITION BITS 6Gbps, NONTRANSITION BITS 100 50 6Gbps, TRANSITION BITS 0 0 5 10 15 LENGTH (in) 20 35 6Gbps 30 25 20 3Gbps 15 30 400 350 3Gbps, NONTRANSITION BITS 300 250 6Gbps, NONTRANSITION BITS 3Gbps, TRANSITION BITS 200 150 10 100 5 50 0 25 VIN = 1VP-P 450 EYE HEIGHT (mV) 350 VIN = 1VP-P, 7.5in OF INPUT TRACE 40 500 MAX4951BE toc23 400 45 DETERMINISTIC JITTER (psP-P) VIN = 1VP-P 450 6Gbps, TRANSITION BITS 0 0 5 10 15 LENGTH (in) 20 25 30 MAX4951BE toc24 LENGTH (in) MAX4951BE toc22 LENGTH (in) 500 EYE HEIGHT (mV) 400 140 MAX4951BE toc21 250 3Gbps, NONTRANSITION BITS VIN = 1VP-P DETERMINISTIC JITTER vs. OUTPUT LENGTH, PA = 0, PB = 0 DETERMINISTIC JITTER (psP-P) VIN = 1VP-P 100 600 MAX4951BE toc19 DETERMINISTIC JITTER (psP-P) 300 EYE HEIGHT vs. INPUT LENGTH, PA = 0, PB = 0 MAX4951BE toc20 DETERMINISTIC JITTER vs. INPUT LENGTH, PA = 0, PB = 0 0 5 10 15 20 25 30 LENGTH (in) _______________________________________________________________________________________ 7 MAX4951BE Typical Operating Characteristics (continued) (TA = +25C, unless otherwise noted.) SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis AOUTM GND BINM BINP TOP VIEW AOUTP MAX4951BE Pin Configuration 15 14 13 12 11 VCC 16 10 VCC GND 17 9 PA 8 PB 7 EN 6 VCC MAX4951BE CAD 18 GND 19 2 3 4 5 BOUTM BOUTP AINP 1 GND + AINM VCC 20 *EP TQFN (4mm x 4mm) *CONNECT EXPOSED PAD (EP) TO GND. Pin Description PIN NAME 1 AINP Noninverting Input from Host Channel A FUNCTION 2 AINM Inverting Input from Host Channel A 3, 13, 17, 19 GND Ground 4 BOUTM Inverting Output to Host Channel B 5 BOUTP Noninverting Output to Host Channel B 6, 10, 16, 20 VCC Positive Supply Voltage Input. Bypass VCC to GND with 1FF and 0.01FF capacitors in parallel as close to the device as possible. 7 EN Active-High Enable Input. Drive EN low to put the device in standby mode. Drive EN high for normal operation. EN is internally pulled down with a 330kW (typ) resistor. 8 PB Channel B Preemphasis Enable Input. Drive PB high to enable channel B output preemphasis. Drive PB low for standard SATA output level. PB is internally pulled down with a 330kW (typ) resistor. 9 PA Channel A Preemphasis Enable Input. Drive PA high to enable channel A output preemphasis. Drive PA low for standard SATA output level. PA is internally pulled down with a 330kW (typ) resistor. 11 BINP Noninverting Input from Device Channel B 12 BINM Inverting Input from Device Channel B 14 AOUTM Inverting Output to Device Channel A 15 AOUTP Noninverting Output to Device Channel A 18 CAD Active-Low Cable-Detect Input. Drive CAD high to put the device in standby mode. Drive CAD low for normal operation. CAD is internally pulled up with a 330kI (typ) resistor. -- EP Exposed Pad. Internally connected to GND. EP must be electrically connected to a ground plane for proper thermal and electrical operation. 8 _______________________________________________________________________________________ SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis VCC MAX4951BE VCC 50 50 VCC 50 50 AINP AOUTP AINM AOUTM VCC 50 VCC 50 50 50 BOUTM BINM BOUTP BINP CONTROL LOGIC GND PA EN PB EN CAD STATUS 0 CAD 0 Low-Power Standby 0 1 Low-Power Standby 1 0 Active 1 1 Low-Power Standby EN PA PB CHANNEL A 0 X X Standby CHANNEL B Standby 1 0 0 Standard SATA Standard SATA 1 1 0 Preemphasis Standard SATA 1 0 1 Standard SATA Preemphasis 1 1 1 Preemphasis Preemphasis Note: PA, PB, EN are internally pulled down to GND by 330k resistors. CAD is internally pulled up to VCC by a 330k resistor. X = Don't care. Detailed Description The MAX4951BE consists of two identical buffers that take SATA input signals and return them to full output levels while withstanding high ESD Q8kV (HBM) protection. This device meets SATA I/II specifications and can meet SATA III specifications. Input/Output Terminations Inputs and outputs are internally 50I terminated to VCC (see the Functional Diagram/Truth Table) and must be AC-coupled to the SATA controller IC and SATA device for proper operation. _______________________________________________________________________________________ 9 MAX4951BE Functional Diagram/Truth Table MAX4951BE SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis OOB Signal Detection The MAX4951BE provides full OOB signal support through high-speed, OOB-detection circuitry. SATA OOB differential input signals of 50mVP-P or less are detected as OFF and are not passed to the output. This prevents the system from responding to unwanted noise. SATA OOB differential input signals of 150mVP-P or more are detected as on and passed to the output. This allows OOB signals to transmit through the MAX4951BE. The time for the OOB-detection circuit to detect an inactive SATA OOB input and squelch the associated output, or to detect an active SATA OOB input and enable the output, is less than 4ns (typ). Enable Input The MAX4951BE features an active-high enable input (EN). EN has an internal pulldown resistor of 330kI (typ). When EN is driven low or left unconnected, the MAX4951BE enters low-power standby mode and the buffers are disabled, reducing the supply current to 500FA (typ). Drive EN high for normal operation. Cable-Detect Input The MAX4951BE features an active-low, cable-detect input (CAD). CAD has an internal pullup resistor of 330kI (typ). When CAD is driven high or left uncon nected, the MAX4951BE enters low-power standby mode and the buffers are disabled, reducing supply current to 500FA (typ). This signal is normally driven low by inserting an eSATA cable into a properly wired socket (see Figure 3). If the cable-detect feature is not desired, simply ground this pin. Dynamic Power-Down Mode The MAX4951BE features a dynamic power-down mode where the device shuts down the major power consump- RC 1M CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE CS 100pF RD 1500 Figure 1. Human Body ESD Test Model Output Preemphasis Selection Inputs The MAX4951BE has two preemphasis-control logic inputs, PA and PB. PA and PB have internal pulldown resistors of 330kI (typ). PA and PB enable preemphasis to the outputs of their corresponding buffers (see the Functional Diagram/Truth Table). Drive PA or PB low or leave unconnected for standard SATA output levels. Drive PA or PB high to provide preemphasis to the output. The preemphasis output signal compensates for attenuation from longer trace lengths or to meet eSATA specifications. ESD Protection As with all Maxim devices, ESD protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The MAX4951BE is protected against ESD Q8kV (HBM). The ESD structures withstand Q8kV in normal operation and powered down states. After an ESD event, the MAX4951BE continues to function without latchup. HBM The MAX4951BE is characterized for Q8kV ESD pro tection using the HBM (MIL-STD-883, Method 3015). Figure 1 shows the HBM and Figure 2 shows the current waveform it generates when discharged into a low-impedance state. This model consists of a 100pF capacitor charged to the ESD voltage of interest that is then discharged into the device through a 1.5kI resistor. IP 100% 90% DISCHARGE RESISTANCE STORAGE CAPACITOR tion circuitry. The MAX4951BE detects whether the input signal does not exist for a 4Fs (typ) duration. Normal power and normal operation resume when a signal above the OOB-threshold level is detected at the input. This function is implemented separately for both channels. Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPS DEVICE UNDER TEST 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM Figure 2. Human Body Current Waveform 10 SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis exposed-pad packages, refer to Application Note 862: HFAN-08.1: Thermal Considerations of QFN and Other Exposed-Paddle Packages. Figure 3 shows a typical application with the MAX4951BE used to drive an eSATA output. The diagram assumes that the MAX4951BE is close to the SATA host controller. PB is set low to drive standard SATA levels to the host, and PA is set high to drive eSATA levels to the device. If the MAX4951BE is further from the controller, set PB high to compensate for attenuation. The MAX4951BE is backward-pin-compatible with MAX4951 (see Figure 4). Layout Use controlled-impedance transmission lines to interface with the MAX4951BE high-speed inputs and outputs. Place power-supply decoupling capacitors as close as possible to VCC pin. Power-Supply Sequencing Exposed-Pad Package Caution: Do not exceed the absolute maximum rat ings because stresses beyond the listed ratings can cause permanent damage to the device. The exposed-pad, 20-pin TQFN package incorporates features that provide a very low thermal resistance path for heat removal from the IC. The exposed pad on the MAX4951BE must be soldered to GND for proper ther mal and electrical performance. For more information on Proper power-supply sequencing is recommended for all devices. Always apply VCC before applying signals, especially if the signal is not current limited. +3.3V 1F 0.01F VCC 1 10nF (X7R) 10nF (X7R) AINP Tx 10nF (X7R) MAX4951BE 3 AOUTM 4 10nF (X7R) Rx Rx 10nF (X7R) AINM SATA HOST CONTROLLER 2 AOUTP 10nF (X7R) eSATA DEVICE CONNECTOR 5 BOUTM BINM BOUTP BINP 6 CAD 7 OR 1* 10nF (X7R) Tx 10nF (X7R) EN PA GPIO VCC PB GND *PINS 1 AND 7 CAN BE INTERCHANGED DEPENDING ON THE LAYOUT. Figure 3. Typical Application Circuit for MAX4951BE Driving an eSATA Output ______________________________________________________________________________________ 11 MAX4951BE Applications Information MAX4951BE SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis +3.3V 1F 0.01F VCC 1 10nF (X7R) 10nF (X7R) AINP Tx 10nF (X7R) 3 AOUTM MAX4951BE 4 10nF (X7R) 10nF (X7R) BOUTM Rx Rx 10nF (X7R) AINM SATA HOST CONTROLLER 2 AOUTP 5 BINM 10nF (X7R) Tx 10nF (X7R) BOUTP eSATA DEVICE CONNECTOR 6 BINP 7 OR 1* EN PA GPIO VCC PB GND CAD *PINS 1 AND 7 CAN BE INTERCHANGED DEPENDING ON THE LAYOUT. Figure 4. Typical Application Circuit for Backward Pin Compatibility with the MAX4951 Chip Information PROCESS: BiCMOS Package Information 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. 20 TQFN-EP T2044+2 21-0139 90-0036 12 SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis REVISION NUMBER REVISION DATE 0 10/09 Initial release -- 1 11/10 Deleted the "Meets SATA I, II Input/Output-Return Loss Mask" feature from the Features section, deleted the "Top Mark" column from the Ordering Information 1 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2010 Maxim Integrated Products 13 Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX4951BE Revision History