19-4178; Rev 1; 5/09 SATA I/SATA II Bidirectional Re-Driver The MAX4951 dual-channel buffer is designed to re-drive serial-ATA (SATA) I and SATA II signals and is functional up to 6.0Gbps for next-generation data rates. The MAX4951 can be placed near an eSATA connector to overcome board losses and produce an eSATA-compatible signal level. The MAX4951 preserves signal integrity at the receiver by reestablishing full output levels, and can reduce the total system jitter (TJ) by squaring up the signal. This device features channel-independent digital boost controls to drive SATA outputs over longer trace lengths, or to meet eSATA specifications. SATA Out-Of-Band (OOB) signaling is supported using high-speed amplitude detection on the inputs, and squelch on the corresponding outputs. Inputs and outputs are all internally 50Ω terminated and must be AC-coupled to the SATA controller IC and SATA device. The MAX4951 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 0°C to +70°C operating temperature range. Applications Features o Single +3.3V (typ) Supply Operation o Supports SATA I (1.5Gbps) and SATA II (3.0Gbps) o Supports up to 6.0Gbps for Next-Generation Applications o Meets SATA I, SATA II Input-/Output-Return Loss Mask o Supports eSATA Levels o Supports SATA Out-of-Band (OOB) Signaling Ω Termination Resistors o Internal Input/Output 50Ω o Inline Signal Traces for Flow-Through Layout o ESD Protection on All Pins: ±5.5kV o Space-Saving, 4mm x 4mm, TQFN Package Ordering Information PART TEMP RANGE PIN-PACKAGE MAX4951CTP+ 0°C to +70°C 20 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Servers Pin Configuration Desktop Computers GND DBM DBP Data Storage/Workstations DAM TOP VIEW Docking Stations DAP Notebook Computers 15 14 13 12 11 VCC 16 10 VCC GND 17 9 BA 8 BB 7 EN 6 VCC GND 18 MAX4951 GND 19 *EP 2 3 4 5 GND HBM HBP HAP 1 HAM VCC 20 TQFN 4mm x 4mm *CONNECT EXPOSED PAD (EP) 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 MAX4951 General Description MAX4951 SATA I/SATA II Bidirectional Re-Driver ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) VCC ........................................................................-0.3V to +4.0V HAP, HAM, DBP, DBM, EN, BA, BB (Note 1)...................................................-0.3V to (VCC + 0.3V) Short-Circuit Output Current (HBP, HBM, DAP, DAM) .................................................90mA Continuous Current at Inputs (HAP, HAM, DBP, DBM) ...............................................±30mA Continuous Current (EN, BA, BB) ...................................................................±5mA Continuous Power Dissipation (TA = +70°C) 20-Pin TQFN (derate 25.6mW/°C above +70°C) ..... 2051mW Junction-to-Case Thermal Resistance (θJC) (Note 2) 20-Pin TQFN...................................................................6°C/W Junction-to-Ambient Thermal Resistance (θJA) (Note 2) 20-Pin TQFN.................................................................39°C/W Operating Temperature Range...............................0°C to +70°C Storage Temperature Range .............................-55°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Note 1: All I/O pins are clamped by internal diodes. 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 = +3.0V to +3.6V, CL = 10nF, RL = 50Ω, TA = 0°C to +70°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C.) (Note 3) PARAMETER Operating Power-Supply Range Operating Supply Current Standby Supply Current Single-Ended Input Resistance Differential Input Resistance Single-Ended Output Resistance Differential Output Resistance SYMBOL CONDITIONS TYP MAX UNITS 3.6 V BA = BB = VCC 90 125 BA = BB = GND 70 100 7 10 VCC ICC ISTBY MIN 3.0 EN = GND ZRX-SE-DC 40 ZRX-DIFF-DC 85 ZTX-SE-DC 40 ZTX-DIFF-DC 85 mA mA Ω 100 115 100 115 f = 150MHz to 300MHz -29 -18 f = 300MHz to 600MHz -26 -14 f = 600MHz to 1200MHz -22 -10 f = 1.2GHz to 2.4GHz -18 -8 f = 2.4GHz to 3.0GHz -15 -3 f = 3.0GHz to 5.0GHz -14 -1 Ω Ω Ω AC PERFORMANCE Differential Input Return Loss (Note 4) Common-Mode Input Return Loss (Note 4) 2 RLRX-DIFF RLRX-CM f = 150MHz to 300MHz -5 f = 300MHz to 600MHz -5 f = 600MHz to 1200MHz -2 f = 1.2GHz to 2.4GHz -2 f = 2.4GHz to 3.0GHz -2 f = 3.0GHz to 5.0GHz -1 _______________________________________________________________________________________ dB dB SATA I/SATA II Bidirectional Re-Driver (VCC = +3.0V to +3.6V, CL = 10nF, RL = 50Ω, TA = 0°C to +70°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C.) (Note 3) PARAMETER Differential Output Return Loss (Note 4) Common-Mode Output Return Loss (Note 4) SYMBOL RLTX-DIFF RLTX-CM TYP MAX f = 150MHz to 300MHz CONDITIONS MIN -32 -14 f = 300MHz to 600MHz -26 -8 f = 600MHz to 1200MHz -21 -6 f = 1.2GHz to 2.4GHz -16 -6 f = 2.4GHz to 3.0GHz -15 -3 f = 3.0GHz to 5.0GHz -13 -1 f = 150MHz to 300MHz -8 f = 300MHz to 600MHz -5 f = 600MHz to 1200MHz -2 f = 1.2GHz to 2.4GHz -2 f = 2.4GHz to 3.0GHz -2 f = 3.0GHz to 5.0GHz Differential Input Signal Range VRX-DFF-PP SATA 1.5Gbps/3.0Gbps Differential Output Swing VTX-DFF-PP f = 750MHz Propagation Delay tR dB dB -1 220 1600 BA = BB = GND 450 525 650 BA = BB = VCC 770 930 1144 tPD Output Rise/Fall Time UNITS 240 (Notes 4, 5) mVP-P mVP-P ps 60 ps Deterministic Jitter TTX-DJ-DFF Up to 6.0Gbps (Notes 4, 6) 15 psP-P Random Jitter TTX-RJ-DFF Up to 6.0Gbps (Notes 4, 6) 1.8 psRMS 150 mVP-P 5 ns OOB Detector Threshold OOB Output Startup/Shutdown Time Crosstalk VTH-OOB tOOB CTK SATA OOB 50 (Note 7) f ≤ 1.5GHz 2 BA = BB = GND -35 BA = BB = VCC -30 dB LOGIC INPUT Input Logic-High VIH Input Logic-Low 1.4 V VIL Input Logic Hysteresis 0.6 VHYST V 0.1 V ±5.5 kV ESD PROTECTION All Pins Note 3: Note 4: Note 5: Note 6: Note 7: Human Body Model All devices are 100% production tested at TA = +70°C. All temperature limits are guaranteed by design. Guaranteed by design. Rise and fall times are measured using 20% and 80% levels. DJ measured using K28.5 pattern; RJ measured using K28.7 pattern. Total time for OOB detection circuit to enable/squelch the output. _______________________________________________________________________________________ 3 MAX4951 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (VCC = 3.3V, TA = +25°C, all eye diagrams measured using K28.5 pattern.) BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 3.0Gbps) -100 -200 100 0 -100 -600 -400 -200 0 200 400 -200 200 100 0 -100 -200 -300 -300 600 MAX4951 toc03 MAX4951 toc02 200 -300 -300 -200 -100 0 100 200 300 -150 -100 -50 0 50 100 150 BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 1.5Gbps) BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 3.0Gbps) BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 6.0Gbps) -200 0 -100 -200 -300 -300 -400 -200 0 200 400 0 -100 -200 -300 -300 600 100 -200 -100 0 100 200 300 -150 -100 -50 0 50 100 BA = BB = VCC EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 1.5Gbps) BA = BB = VCC EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 3.0Gbps) BA = BB = VCC EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 6.0Gbps) 200mV/div 200 0 -200 -400 500 400 300 200 100 0 -100 -200 -300 -400 -500 500 400 300 200 200mV/div 400 200mV/div MAX4951 toc07 600 150 MAX4951 toc09 50ps/div EYE DIAGRAM VOLTAGE (mV) 100ps/div MAX4951 toc08 200ps/div EYE DIAGRAM VOLTAGE (mV) -600 200 100mV/div -100 100 300 EYE DIAGRAM VOLTAGE (mV) 0 200 100mV/div 100mV/div 100 EYE DIAGRAM VOLTAGE (mV) 200 300 MAX4951 toc06 50ps/div MAX4951 toc05 100ps/div MAX4951 toc04 200ps/div 300 EYE DIAGRAM VOLTAGE (mV) 300 100mV/div 0 300 EYE DIAGRAM VOLTAGE (mV) 100 BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 6.0Gbps) 100mV/div 200 100mV/div EYE DIAGRAM VOLTAGE (mV) 300 EYE DIAGRAM VOLTAGE (mV) MAX4951 toc01 BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 1.5Gbps) EYE DIAGRAM VOLTAGE (mV) MAX4951 SATA I/SATA II Bidirectional Re-Driver 100 0 -100 -200 -300 -400 -500 -600 -600 -400 -200 0 200ps/div 4 200 400 600 -300 -200 -100 0 100 200 300 -150 -100 -50 100ps/div _______________________________________________________________________________________ 0 50ps/div 50 100 150 SATA I/SATA II Bidirectional Re-Driver -200 -400 400 200 0 -200 -400 -600 0 200 400 600 200 0 -200 -600 -300 -200 -100 200ps/div 0 100 200 -150 300 -100 -50 0 100ps/div SATA MASK -5 -10 -15 MAX4951 -25 -30 -35 -40 5 DIFFERENTIAL OUTPUT RETURN LOSS (dB) 5 -20 100 150 DIFFERENTIAL OUTPUT RETURN LOSS vs. FREQUENCY DIFFERENTIAL INPUT RETURN LOSS vs. FREQUENCY 0 50 50ps/div MAX4951 toc14 -200 MAX4951 toc13 -400 400 -400 -600 -600 MAX4951 toc12 MAX4951 toc11 600 EYE DIAGRAM VOLTAGE (mV) 0 BA = BB = VCC EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 6.0Gbps) 200mV/div 200mV/div 200 600 EYE DIAGRAM VOLTAGE (mV) MAX4951 toc10 400 DIFFERENTIAL INPUT RETURN LOSS (dB) EYE DIAGRAM VOLTAGE (mV) 600 BA = BB = VCC EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 3.0Gbps) 200mV/div BA = BB = VCC EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 1.5Gbps) SATA MASK 0 -5 -10 -15 -20 MAX4951 -25 -30 -35 -40 -45 -45 0 1 2 3 FREQUENCY (GHz) 4 5 0 1 2 3 FREQUENCY (GHz) 4 5 _______________________________________________________________________________________ 5 MAX4951 Typical Operating Characteristics (continued) (VCC = 3.3V, TA = +25°C, all eye diagrams measured using K28.5 pattern.) SATA I/SATA II Bidirectional Re-Driver MAX4951 Pin Description PIN NAME FUNCTION 1 HAP Noninverting Input from Host Channel A 2 HAM Inverting Input from Host Channel A 3, 13, 17, 18, 19 GND Ground 4 HBM Inverting Output to Host Channel B 5 HBP Noninverting Output to Host Channel B 6, 10, 16, 20 VCC Positive Supply Voltage Input. Bypass VCC to GND with 0.1µF and 0.001µF capacitors in parallel and as close to the device as possible. 7 EN Active-High Enable Input. Drive EN low to put device in standby mode. Drive EN high for normal operation. EN is internally pulled down. 8 BB Channel-B Boost Enable Input. Drive BB high to enable channel-B output boost. Drive BB low for standard SATA output level. BB is internally pulled down. 9 BA Channel-A Boost Enable Input. Drive BA high to enable channel-A output boost. Drive BA low for standard SATA output level. BA is internally pulled down. 11 DBP Noninverting Input from Device Channel B 12 DBM Inverting Input from Device Channel B 14 DAM Inverting Output to Device Channel A 15 DAP — EP Noninverting Output to Device Channel A Exposed Pad. Internally connected to GND. EP must be electrically connected to a ground plane for proper thermal and electrical operation. Detailed Description The MAX4951 consists of two identical buffers that take SATA input signals and return them to full output levels. This device functions up to 6.0Gbps for next-generation SATA applications. Input/Output Terminations Inputs and outputs are internally 50Ω 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. Out-Of-Band Logic The MAX4951 provides full Out-Of-Band (OOB) signal support through high-speed amplitude detection circuitry. SATA OOB differential input signals of 50mVP-P or less are detected as OFF and 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 MAX4951. The time for the amplitude detection circuit to detect an inactive SATA OOB input and squelch the associated output, or detect an active SATA OOB input and enable the output, is less than 5ns. 6 Enable Input The MAX4951 features an active-high enable input (EN). EN has an internal pulldown resistor of 70kΩ (typ). When EN is driven low or left unconnected, the MAX4951 enters low-power standby mode and the buffers are disabled. Drive EN high for normal operation. Output Boost Selection Inputs The MAX4951 has two digital control logic inputs, BA and BB. BA and BB have internal pulldown resistors of 70kΩ (typ). BA and BB control the boost level of their corresponding buffers (see the Functional Diagram/ Truth Table). Drive BA or BB low or leave unconnected for standard SATA output levels. Drive BA or BB high to boost the output. The boosted output level compensates for attenuation from longer trace-length cables or to meet eSATA specifications. Applications Information Figure 3 shows a typical application circuit with the MAX4951 used to drive an eSATA output. The diagram assumes that the MAX4951 is close to the SATA host controller. BB is set low to drive standard SATA levels to the host, and BA is set high to drive eSATA levels to the device. If the MAX4951 is further from the controller, set BB high to compensate for attenuation. _______________________________________________________________________________________ SATA I/SATA II Bidirectional Re-Driver VCC VCC 50Ω MAX4951 50Ω VCC 50Ω 50Ω HAP DAP HAM DAM VCC 50Ω VCC 50Ω 50Ω 50Ω HBM DBM HBP DBP CONTROL LOGIC GND BA BB EN MAX4951 EN BA BB CHANNEL A CHANNEL B 0 X X Standby Standby 1 0 0 Standard SATA Standard SATA 1 1 0 Boost Standard SATA 1 0 1 Standard SATA Boost 1 1 1 Boost Boost X = Don’t Care Exposed-Pad Package 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 MAX4951 must be soldered to GND for proper thermal and electrical performance. For more information on exposed-pad packages, refer to Maxim Application Note HFAN-08.1: Thermal Considerations of QFN and Other Exposed-Paddle Packages. Layout Use controlled-impedance transmission lines to interface with the MAX4951 high-speed inputs and outputs. Place power-supply decoupling capacitors as close as possible to VCC. 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 MAX4951 is protected against ESD up to ±5.5kV (Human Body Model) without damage. The ESD structures withstand ±5.5kV in all states: normal operation and powered down. After an ESD event, the MAX4951 continues to function without latchup. _______________________________________________________________________________________ 7 MAX4951 Functional Diagram/Truth Table MAX4951 SATA I/SATA II Bidirectional Re-Driver Human Body Model Power-Supply Sequencing The MAX4951 is characterized for ±5.5kV ESD protection using the Human Body Model (MIL-STD-883, Method 3015). Figure 1 shows the Human Body Model and Figure 2 shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest that is then discharged into the device through a 1.5kΩ resistor. 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 VCC before applying signals, especially if the signal is not current limited. RC 1MΩ CHARGE-CURRENT LIMIT RESISTOR RD 1500Ω IP 100% 90% DISCHARGE RESISTANCE Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPS HIGHVOLTAGE DC SOURCE Cs 100pF STORAGE CAPACITOR DEVICE UNDER TEST 36.8% 10% 0 0 Figure 1. Human Body ESD Test Model 8 tRL TIME tDL CURRENT WAVEFORM Figure 2. Human Body Current Waveform _______________________________________________________________________________________ SATA I/SATA II Bidirectional Re-Driver MAX4951 +3.3V 0.1µF 0.001µF Tx SATA HOST CONTROLLER 10nF (X7R) HAP DAP HAM DAM 10nF (X7R) 10nF (X7R) 10nF (X7R) Rx 10nF (X7R) MAX4951 HBM DBM HBP DBP 10nF (X7R) 10nF (X7R) EN BA GPIO +3.3V Rx BB Tx eSATA DEVICE CONNECTOR 10nF (X7R) GND Figure 3. Typical Application Circuit Package Information Chip Information For the latest package outline information, go to www.maxim-ic.com/packages. PROCESS: BiCMOS PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 20 TQFN-EP T2044-2 21-0139 Revision History REVISION NUMBER REVISION DATE 0 6/08 Initial release 1 5/09 Updated Features, Electrical Characteristics table, Applications Information section, and added ESD Protection and Human Body Model sections. DESCRIPTION PAGES CHANGED — 1, 3, 6, 7, 8 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 _____________________ 9 © 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.