19-5126; Rev 0; 1/10 TION KIT EVALUA BLE IL AVA A Dual 1.5/3.0/6.0Gbps SAS/SATA Redriver The MAX4952B dual-channel redriver is designed to redrive one full lane of SAS or SATA signals up to 6.0Gbps and operates from a single +3.3V supply. The MAX4952B is designed for commercial SAS or SAS/SATA applications, such as servers. The MAX4952B features independent output boost and enhances signal integrity at the receiver by re-establishing full output levels. SAS and SATA out-of-band (OOB) signaling are supported using high-speed amplitude detection on the inputs and squelch on the corresponding outputs. Features S Single +3.3V Supply Operation S Low Power-Down Current (350µA typ) for Power- Sensitive Applications S Supports SAS I/II/III P 6.0Gbps S Excellent Return Loss Exceeds SAS/SATA Return Loss Mask (Better Than 8dB Up to 3GHz) S Supports SAS/SATA OOB-Level Signaling Very Fast Entry and Exit Time of 5ns (Max) Programmable SAS/SATA Threshold Inputs and outputs are all terminated in 50I internally and exhibit excellent return loss. S Independent Output-Boost Selection Two Levels: 0dB, 6dB The MAX4952B is available in a small, 20-pin, 4.0mm x 4.0mm TQFN package with flow-through traces for ease of layout. This device is specified over the 0NC to +70NC operating temperature range. S On-Chip 50I Input/Output Terminations Applications S In-Line Signal Traces for Flow-Through Layout S Space-Saving, 4.0mm x 4.0mm TQFN Package S ESD Protection on All Pins: ±5.5kV (Human Body Model) Servers Data Storage Ordering Information PART TEMP RANGE PIN-PACKAGE MAX4952BCTP+ 0NC to +70NC 20 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed Pad. ________________________________________________________________ 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. MAX4952B General Description MAX4952B Dual 1.5/3.0/6.0Gbps SAS/SATA Redriver ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) VCC. ......................................................................-0.3V to +4.0V All Other Pins (Note 1).............................. -0.3V to (VCC + 0.3V) Short-Circuit Output Current DAP, DAM, HBM, HBP..........90mA Continuous Power Dissipation (TA = +70NC) 20-Pin TQFN (derate 25.6mW/NC above +70NC)........2051mW Junction-to-Case Thermal Resistance (BJC) (Note 2) 20-Pin TQFN....................................................................6NC/W Junction-to-Ambient Thermal Resistance (BJA) (Note 2) 20-Pin TQFN..................................................................39NC/W Operating Temperature Range.............................. 0NC to +70NC Junction Temperature......................................................+150NC Storage Temperature Range............................. -55NC to +150NC Lead Temperature (soldering, 10s).................................+300NC 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 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, CCL = 10nF coupling capacitor on each output, RL = 50I on each output, TA = 0NC to +70NC, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25NC.) (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC PERFORMANCE Power-Supply Range VCC Power-Down Current IPWRDN EN = GND ICC EN = VCC Supply Current Input Impedance, Differential Output Impedance, Differential ZRX-DIFFDC ZTX-DIFFDC 3.0 BA = BB = VCC BA = BB = GND 3.6 V 0.35 2 mA 100 130 85 100 mA DC 85 100 115 I DC 85 100 115 I AC PERFORMANCE Input Return Loss, Differential (Note 4) Input Return Loss, Common Mode (Note 4) RLRX-DIFF RLRX-CM 0.1GHz < f P 0.3GHz -18 0.3GHz < f P 0.6GHz -14 0.6GHz < f P 1.2GHz -10 1.2GHz < f P 2.4GHz -8 2.4GHz < f P 3.0GHz -8 3.0GHz < f P 6.0GHz -1 0.1GHz < f P 0.3GHz -6 0.3GHz < f P 0.6GHz -5 0.6GHz < f P 1.2GHz -5 1.2GHz < f P 2.4GHz -5 2.4GHz < f P 3.0GHz -5 3.0GHz < f P 6.0GHz -1 2 _______________________________________________________________________________________ dB dB Dual 1.5/3.0/6.0Gbps SAS/SATA Redriver (VCC = +3.0V to +3.6V, CCL = 10nF coupling capacitor on each output, RL = 50I on each output, TA = 0NC to +70NC, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25NC.) (Note 3) PARAMETER Output Return Loss, Differential (Note 4) Output Return Loss, Common Mode (Note 4) SYMBOL RLTX-DIFF RLTX-CM CONDITIONS MIN TYP -14 0.3GHz < f P 0.6GHz -8 0.6GHz < f P 1.2GHz -8 1.2GHz < f P 2.4GHz -8 2.4GHz < f P 3.0GHz -8 3.0GHz < f P 6.0GHz -1 0.1GHz < f P 0.3GHz -8 0.3GHz < f P 0.6GHz -5 0.6GHz < f P 1.2GHz -5 1.2GHz < f P 2.4GHz -5 2.4GHz < f P 3.0GHz -5 SATA 1.5Gbps, 3Gbps, 6Gbps, M = GND OOB Squelch Threshold Differential Output-Voltage Swing Propagation Delay VRX-DFF-PP SAS 1.5Gbps, 3Gbps, M = VCC SAS 6.0Gbps, M = VCC VSQ-DIFF 225 1600 275 1600 300 1600 SATA OOB, M = GND 50 150 SAS OOB, M = VCC 120 220 BA = BB = GND 450 650 BA = BB = VCC 900 1300 VTX-DIFF-PP f = 750MHz, 1.5GHz tPD Output Rise/Fall Time tTX-RISEFALL UNITS dB dB -1 3.0GHz < f P 6.0GHz Differential Input Signal Range MAX 0.1GHz < f P 0.3GHz 300 Figure 1 (Notes 4, 5) 40 mVP-P mVP-P mVP-P ps 40 ps Deterministic Jitter tTX-DJ-DD Up to 6.0Gbps (Notes 4, 6) 15 psP-P Random Jitter tTX-RJ-DD Up to 6.0Gbps (Notes 4, 6) 1.4 psRMS 5 ns OOB Output Startup/Shutdown Time tOOB (Note 7) 3 Differential Offset Delta DVOOB,DIFF Difference between OOB and active-mode output offset -80 +80 mV Common-Mode Delta DVOOB,CM Difference between OOB and active-mode output VCM -50 +50 mV 0.6 V CONTROL LOGIC Input Logic-Level Low VIL Input Logic-Level High VIH Input Logic Hysteresis VHYST 100 mV Input Pulldown Resistor RDOWN 70 kI ±5.5 kV 1.4 V ESD PROTECTION All Pins Note Note Note Note Note 3: 4: 5: 6: 7: Human Body Model All devices are 100% production tested at TA = +70°C. Specifications for 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 D10.2 pattern. Total time for OOB detection circuit to enable/squelch the output. _______________________________________________________________________________________ 3 MAX4952B ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (VCC = +3.3V, M = GND, TA = +25NC; all eye diagrams measured using K28.5 pattern, unless otherwise noted.) VIN = 225mVP-P, 1.5Gbps, B_ = 0 300 200 200 200 100 100 100 100mV/div 300 0 0 0 -100 -100 -100 -200 -200 -200 -300 -300 -300 -400 -600 -400 -200 0 200 400 600 -300 -200 -100 200ps/div 0 100 200 -400 300 -150 400 400 200 200 200 200mV/div 400 200mV/div 600 0 -200 -200 -400 -400 -400 -600 -600 -600 0 200 400 600 -300 -200 -100 0 100 200 300 -150 VIN = 1600mVP-P, 1.5Gbps, B_ = 0 200 200 100 100 100 100mV/div 200 100mV/div 300 0 -100 -100 -200 -200 -200 -300 -300 -300 -400 -200 0 200ps/div 200 400 600 50 100 150 MAX4952B toc09 0 -100 -400 0 400 300 -400 -50 VIN = 1600mVP-P, 6Gbps, B_ = 0 MAX4952B toc08 400 300 0 150 50ps/div VIN = 1600mVP-P, 3Gbps, B_ = 0 MAX4952B toc07 -600 -100 100ps/div 400 100 0 -200 200ps/div 50 MAX4952B toc06 600 0 0 VIN = 225mVP-P, 6Gbps, B_ = 1 MAX4952B toc05 600 -200 -50 50ps/div VIN = 225mVP-P, 3Gbps, B_ = 1 MAX4952B toc04 -400 -100 100ps/div VIN = 225mVP-P, 1.5Gbps, B_ = 1 -600 MAX4952B toc03 400 300 100mV/div 100mV/div MAX4952B toc02 400 -400 200mV/div VIN = 225mVP-P, 6Gbps, B_ = 0 VIN = 225mVP-P, 3Gbps, B_ = 0 MAX4952B toc01 400 100mV/div MAX4952B Dual 1.5/3.0/6.0Gbps SAS/SATA Redriver -400 -300 -200 -100 0 100ps/div 100 200 300 -150 -100 -50 0 50ps/div 4 _______________________________________________________________________________________ 50 100 150 Dual 1.5/3.0/6.0Gbps SAS/SATA Redriver VIN = 1600mVP-P, 1.5Gbps, B_ = 1 VIN = 1600mVP-P, 3Gbps, B_ = 1 VIN = 1600mVP-P, 6Gbps, B_ = 1 MAX4952B toc11 MAX4952B toc12 600 400 400 400 200 200 200 0 200mV/div 600 200mV/div 600 0 0 -200 -200 -200 -400 -400 -400 -600 -600 -600 0 200 400 600 -300 -200 200ps/div -100 0 100 200 300 -100 -50 0 EC TABLE LIMIT -10 -15 0 50 100 150 50ps/div DIFFERENTIAL INPUT RETURN LOSS vs. FREQUENCY -5 -150 100ps/div DIFFERENTIAL OUTPUT RETURN LOSS vs. FREQUENCY MAX4952B -20 -25 -30 -35 -40 0 -5 MAX4952B toc14 -200 DIFFERENTIAL INPUT RETURN LOSS (dB) -400 MAX4952B toc13 -600 DIFFERENTIAL INPUT RETURN LOSS (dB) 200mV/div MAX4952B toc10 EC TABLE LIMIT -10 MAX4952B -15 -20 -25 -30 -35 -40 0 2 4 FREQUENCY (GHz) 6 0 2 4 6 FREQUENCY (GHz) _______________________________________________________________________________________ 5 MAX4952B Typical Operating Characteristics (continued) (VCC = +3.3V, M = GND, TA = +25NC; all eye diagrams measured using K28.5 pattern, unless otherwise noted.) Dual 1.5/3.0/6.0Gbps SAS/SATA Redriver DAM GND DBM DBP TOP VIEW DAP MAX4952B Pin Configuration 15 14 13 12 11 VCC 16 10 VCC GND 17 9 BA 8 BB 7 EN 6 VCC MAX4952B GND 18 M 19 3 4 5 HBM HBP 2 GND 1 HAM + HAP VCC 20 *EP TQFN *CONNECT EXPOSED PAD (EP) TO GND. Pin Description PIN NAME 1 HAP Noninverting Input from Host Channel A. HAP must be capacitively coupled (see note). FUNCTION 2 HAM Inverting Input from Host Channel A. HAM must be capacitively coupled (see note). 3, 13, 17, 18 GND Ground 4 HBM Inverting Output to Host Channel B. HBM must be capacitively coupled (see note). 5 HBP Noninverting Output to Host Channel B. HBP must be capacitively coupled (see note). 6, 10, 16, 20 VCC Power-Supply Input. Bypass VCC to GND with low-ESR 0.01FF and 4.7FF capacitors in parallel as close to the device as possible; recommended for each VCC pin. 7 EN Enable Input. Drive EN low for low-power standby mode. Drive EN high for normal operation. EN is internally pulled down by a 70kI (typ) resistor. 8 BB Channel B Boost-Enable Input. Drive BB high to enable channel B +6dB output boost. Drive BB low for standard SAS/SATA output level. BB is internally pulled down by a 70kI (typ) resistor. 9 BA Channel A Boost-Enable Input. Drive BA high to enable channel A +6dB output boost. Drive BA low for standard SAS/SATA output level. BA is internally pulled down by a 70kI (typ) resistor. 11 DBP Noninverting Input from Device Channel B. DBP must be capacitively coupled (see note). 12 DBM Inverting Input from Device Channel B. DBM must be capacitively coupled (see note). 14 DAM Inverting Output to Device Channel B. DAM must be capacitively coupled (see note). 15 DAP Noninverting Output to Device Channel B. DAP must be capacatively coupled (see note). 19 M OOB-Mode Logic Input. M is internally pulled down by a 70kI (typ) resistor. Drive M low or leave unconnected for SATA OOB threshold. Drive M high for SAS OOB threshold. — EP Exposed Pad. Internally connected to GND. Connect to a large ground plane for proper thermal and electrical operation. Not intended as an electrical connection point. Note: For proper operation, Maxim recommends the use of low-ESR, X7R, 10nF, 0402-sized capacitors for all redriver inputs and outputs. 6 _______________________________________________________________________________________ Dual 1.5/3.0/6.0Gbps SAS/SATA Redriver MAX4952B RISE/FALL TIME COMPLIANCE POINT eSATA CONNECTOR 2in (5cm) MINIMUM CONTROLLED IMPEDANCE MAX4952B Figure 1. Circuit for Measuring tR/F for MAX4952B (refer to the SATA specifications for compliance measurement) Functional Diagram/Truth Table VCC VCC 50Ω VCC MAX4952B 50Ω 50Ω 50Ω HAP DAP HAM DAM VCC 50Ω VCC 50Ω 50Ω EN BA BB CHANNEL A OUTPUT LEVEL CHANNEL B OUTPUT LEVEL 0 X X Power-Down Power-Down 1 0 0 No Boost No Boost 1 0 1 No Boost Boost 1 1 0 Boost No Boost 1 1 1 Boost Boost X = Don’t care. M OOB THRESHOLD 0 SATA 1 SAS/SATA 50Ω HBM DBM HBP DBP CONTROL LOGIC GND EN M BA BB _______________________________________________________________________________________ 7 MAX4952B Dual 1.5/3.0/6.0Gbps SAS/SATA Redriver +3.3V 4.7μF 10nF (X7R) Tx 10nF (X7R) VCC HAP 0.01μF DAP 10nF (X7R) 10nF (X7R) HAM Rx DAM MAX4952B SAS HOST CONTROLLER 10nF (X7R) Rx SAS DEVICE CONNECTOR 10nF (X7R) HBM DBM HBP DBP 10nF (X7R) 10nF (X7R) EP M GPIO BA Tx BB GND GPIO Figure 2. Typical Application Circuit SAS CABLE BACKPLANE SAS/SATA HDD MIDPLANE 8in BOARD TRACES MAX4952B MAIN BOARD 8in BOARD TRACES Figure 3. MAX4952B Driving a SAS Cable 8 _______________________________________________________________________________________ SAS CONTROLLER Dual 1.5/3.0/6.0Gbps SAS/SATA Redriver The MAX4952B dual-channel redriver is designed to redrive one full lane of SAS/SATA signals up to 6.0Gbps while operating from a single +3.3V supply. The MAX4952B features independent output boost and enhances signal integrity at the receiver by re-establishing full output levels. SAS/SATA OOB signaling is supported using high-speed amplitude detection on the inputs and squelch on the corresponding outputs. Input/Output Terminations Inputs and outputs are internally 50I terminated to VCC (see the Functional Diagram/Truth Table) and must be AC-coupled using low-ESR, X7R, 10nF capacitors to the SAS/SATA controller IC and SAS/SATA device for proper operation. Enable Input (EN)/Power-Down Mode The MAX4952B features an active-high enable input, EN, which has an internal pulldown resistor of 70kI (typ). When EN is driven low or left unconnected, the MAX4952B enters power-down mode and squelches the output. Drive EN high for normal operation. SAS/SATA Mode Input (M) The MAX4952B supports both SAS and SATA OOB levels. When in SAS mode, the OOB threshold is 120mVP-P (min), and when in SATA mode, the OOB threshold is 50mVP-P (min). Signals below the OOB threshold are squelched to prevent unwanted noise from being redriven at the output. Drive M low or leave unconnected to set SATA OOB levels. Drive M high to set SAS OOB levels. See the Functional Diagram/Truth Table. M has an internal pulldown resistor of 70kI (typ). Output Boost-Selection Inputs (BA, BB) The MAX4952B has two digital control logic inputs, BA and BB. BA and BB have internal pulldown resistors of 70kI (typ). BA and BB control the boost level of their corresponding redrivers (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 or for standard SAS output levels. Applications Information Layout Circuit board layout and design can significantly affect the performance of the MAX4952B. Use good, high-fre- quency design techniques, including minimizing ground inductance and using controlled-impedance transmission lines on data signals. Place low-ESR 0.01FF and 4.7FF power-supply bypass capacitors in parallel as close to VCC as possible, or, as recommended, on each VCC pin. Always connect VCC to a power plane. The MAX4952B requires coupling capacitors for all redriver inputs and outputs. Maxim recommends high-quality, low-ESR, X7R, 10nF, 0402-sized capacitors. 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 MAX4952B must be soldered to the circuit board ground plane for proper thermal and electrical 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. 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 MAX4952B is protected against ESD up to Q5.5kV (Human Body Model) without damage. The ESD structures withstand Q5.5kV in all states (normal operation and powered down). After an ESD event, the MAX4952B continues to function without latchup. Human Body Model The MAX4952B is characterized for Q5.5kV ESD protection using the Human Body Model (MIL-STD-883, Method 3015). Figure 4 shows the Human Body Model and Figure 5 shows the current waveform it generates when discharged into 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 1.5kI resistor. Power-Supply Sequencing Caution: Do not exceed the absolute maximum ratings because stresses beyond the listed ratings can 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. _______________________________________________________________________________________ 9 MAX4952B Detailed Description MAX4952B Dual 1.5/3.0/6.0Gbps SAS/SATA Redriver RC 1MΩ CHARGE-CURRENT LIMIT RESISTOR HIGHVOLTAGE DC SOURCE CS 100pF RD 1500Ω IP 100% 90% DISCHARGE RESISTANCE STORAGE CAPACITOR Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) AMPS DEVICE UNDER TEST Figure 4. Human Body ESD Test Model 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM Figure 5. Human Body Current Waveform Chip Information 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. PROCESS: BiCMOS PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 20 TQFN-EP T2044+2 21-0139 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. 10 © 2010 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.