MAX14986 Dual 6GT/s SAS/SATA Redriver with Equalization and Extended Temperature Operation General Description Benefits and Features The MAX14986 dual-channel redriver is designed to redrive one full lane of SAS or SATA signals up to 6.0GT/s (gigatransfers per second) and operates from a single +3.3V supply. High-Performance Solution Designed to Overcome Lossy Channels * 3dB of Independent (per Channel) Selectable Input EQ and Output Preemphasis * Compensates Up to 30in of Channel Losses with Deterministic Jitter: 23psP-P (max); Random Jitter: 1.5psRMS (max) * 8dB (typ) of Return Loss Up to 3.0GHz The MAX14986 features independent input equalization and output preemphasis. It enhances signal integrity at the receiver by equalizing the signal at the input and establishing preemphasis at the output of the device. SAS and SATA OOB (out-of-band) signaling is supported using high-speed amplitude detection on the inputs and squelch on the corresponding outputs. Inputs and outputs are all internally 50 terminated and must be AC-coupled to the SAS/SATA controller IC and SAS/SATA device. Designed to Reliably Operate in Harsh Environments * Industrial Temperature Rated: -40C to +85C * 2.5kV Human Body Model (HBM) ESD Protection on All Pins * Housed in a Flow-Through (3.5mm x 5.5mm, 28-Pin) TQFN Package for Resistance to Vibration/Shocks The MAX14986 is available in a small 28-pin, 3.5mm x 5.5mm TQFN package with flow-through traces for ease of layout. This device is specified over the -40C to +85C extended operating temperature range. Ease of Design and Layout * Single 3.3V Operation * Internal Input/Output 50 Termination Resistors on All Pins * Flow-Through Pinout Applications Industrial/Embedded PCs Computer on Modules Carrier Boards Test Equipment Rack Server Industrial PCs Medical Equipment Ordering Information appears at end of data sheet. For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX14986.related. Pin Configuration MODE VCC GND IN1M IN1P GND OUT0M OUT0P VCC GND TOP VIEW 24 23 22 21 20 19 18 17 16 15 14 PE1 GND 25 13 EQ1 MAX14986 GND 27 12 PE0 *EP 1 2 3 4 5 6 7 8 VCC GND IN0P IN0M GND OUT1P OUT1M GND + TQFN *CONNECT EXPOSED PAD (EP) TO GND. 19-6639; Rev 0; 3/13 11 EQ0 9 10 VCC GND 28 EN GND 26 Dual 6GT/s SAS/SATA Redriver with Equalization and Extended Temperature Operation MAX14986 Absolute Maximum Ratings (Voltages referenced to GND.) VCC........................................................................-0.3V to +4.0V All Other Pins.............................................. -0.3V to (VCC+ 0.3V Continuous Current (PE_, EQ_, MODE)...........................15mA Peak Current (for 10kHz, 1% duty cycle) (IN__, OUT__)................................................................100A Continuous Power Dissipation (TA= +70C) TQFN (derate 28.6mW/C above +70C)..................2286mW Operating Temperature Range............................ -40C to +85C Storage Temperature Range............................. -55C to +150C Junction Temperature.........................................................+15C Lead Temperature (soldering, 10s).................................. +300C Soldering Temperature (reflow)........................................+260C 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 1) Junction-to-Ambient Thermal Resistance (JC)..............2.7C/W Junction-to-Ambient Thermal Resistance (JA)...............35C/W Note 1: 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.maximintegrated.com/thermal-tutorial. Electrical Characteristics (VCC = +3.0V to +3.6V, CCOUPLE = 12nF, RL = 50, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25C.) (Note 2) PARAMETER SYMBOL Operating Power-Supply Range VCC Operating Supply Current ICC Standby Supply Current ISTBY CONDITIONS MIN TYP 3.0 MAX UNITS 3.6 V EQ_ = PE_ = GND 140 175 EQ_ = PE_ = VCC 175 220 EN = GND 16 20 mA mA Input Termination RRX-SE Single-ended to VCC 42.5 57.5 Output Termination RTX-SE Single-ended to VCC 42.5 57.5 AC PERFORMANCE Differential Input Return Loss (Note 3) Common-Mode Input Return Loss (Note 3) Differential Output Return Loss (Note 3) Common-Mode Output Return Loss (Note 3) Differential Input Voltage Input Equalization Differential Output Voltage www.maximintegrated.com SDD11 SCC11 SDD22 SCC22 VIN-DIFF EQ VOUT-DIFF 0.1GHz f 0.3GHz -10 0.3GHz f 3.0GHz -7.9 3.0GHz f 6.0GHz 0 0.1GHz f 0.3GHz -6 0.3GHz f 3.0GHz -5 3.0GHz f 6.0GHz 0 0.1GHz f 0.3GHz -10 0.3GHz f 3.0GHz -7.9 3.0GHz f 6.0GHz 0 0.1GHz f 0.3GHz -6 0.3GHz f 3.0GHz -4 3.0GHz f 6.0GHz 0 dB dB dB dB SAS 1.5, 3.0, or 6.0GT/s MODE = GND 275 1600 SATA 1.5, 3.0, or 6.0GT/s MODE = VCC 225 1600 EQ_ = VCC (Note 4) f = 750MHz, PE_ = GND 3 750 mVP-P dB 1200 mVP-P Maxim Integrated 2 Dual 6GT/s SAS/SATA Redriver with Equalization and Extended Temperature Operation MAX14986 Electrical Characteristics (continued) (VCC = +3.0V to +3.6V, CCOUPLE = 12nF, RL = 50, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25C.) (Note 2) PARAMETER SYMBOL CONDITIONS Output Preemphasis PE PE_ = VCC, Figure 1 Propagation Delay tPD PE_ = EQ_ = GND Output Transition Time Differential Output Skew Same Pair TTX-RF MIN PE_ = GND, 20% to 80% TYP MAX 3 dB 300 ps 30 TSK ps 10 Deterministic Jitter TDJ K28.5 pattern, 6.0GT/s, PE_ = EQ_ = GND (Note 3) Random Jitter TRJ D10.2 pattern, 6.0GT/s, PE_ = EQ_ = GND UNITS ps 23 psP-P 1.5 psRMS MODE = GND, f = 0.75GHz 120 220 MODE = VCC, f = 0.75GHz 75 200 mVP-P OOB Squelch Threshold VSQ-DIFF OOB Squelch Entry Time TOOB,SQ f = 0.75GHz (Note 3) 5 ns OOB Squelch Exit Time TOOB,EX f = 0.75GHz (Note 3) 9 ns OOB Differential Offset Delta Difference between OOB and active-mode VOOB,DIFF output offset -50 +50 mV OOB Common-Mode Offset Delta VOOB,CM Difference between OOB and active-mode output common-mode voltage -30 +30 mV OOB Output Disable VOOB,OUT OOB disabled output level 30 mVP-P CONTROL LOGIC INPUTS Input Logic-High VIH Input Logic-Low VIL Input Logic Hysteresis VHYST Input Leakage Current IIN 1.4 V 0.6 75 VCC = +3.3V, VIN = +0.5V or +1.5V -50 V mV +50 A Note 2: All devices are 100% production tested at TA= +85C. All temperature limits are guaranteed by design. Note 3: Guaranteed by design. Note 4: EQ (input equalization) as employed in this device refers to the equivalent of adding preemphasis before the input. For example, input EQ of 3dB would show the same waveform as output PE of 3dB (see Figure 1). Timing Diagram VLOW_PP PE(dB) = 20log [( VHIGH_PP VLOW_PP VHIGH_PP )] Figure 1. Output Preemphasis www.maximintegrated.com Maxim Integrated 3 Dual 6GT/s SAS/SATA Redriver with Equalization and Extended Temperature Operation MAX14986 Typical Operating Characteristics (VCC = +3.3V, TA = +25C, all eye diagrams measured using K28.5 pattern.) VIN = 275mVP-P, 1.5Gbps, PE = 0, EQ = 0 VIN = 275mVP-P, 3Gbps, PE = 0, EQ = 0 MAX14986 toc02 400 200 0 -200 -400 -400 -200 0 200 400 200 0 -200 -400 400 -200 200ps/div -100 0 100 400 200 0 -200 -400 600 400 200 0 -200 -400 -600 800 -200 0 200 400 200 0 -200 -400 -600 0 50ps/div www.maximintegrated.com 100 MAX14986 toc05 400 200 0 -200 -400 -600 600 EYE DIAGRAM VOLTAGE (200mV/div) EYE DIAGRAM VOLTAGE (200mV/div) 600 -50 50 -200 -100 0 100 200 100ps/div MAX14986 toc06 -100 0 600 -800 400 VIN = 275mVP-P, 6Gbps, PE = 1, EQ = 0 -800 -50 VIN = 275mVP-P, 3Gbps, PE = 1, EQ = 0 200ps/div 800 -100 50ps/div MAX14986 toc04 -400 MAX14986 toc03 100ps/div VIN = 275mVP-P, 1.5Gbps, PE = 1, EQ = 0 -800 VIN = 275mVP-P, 6Gbps, PE = 0, EQ = 0 -600 200 EYE DIAGRAM VOLTAGE (200mV/div) EYE DIAGRAM VOLTAGE (200mV/div) 800 600 EYE DIAGRAM VOLTAGE (200mV/div) EYE DIAGRAM VOLTAGE (200mV/div) EYE DIAGRAM VOLTAGE (200mV/div) MAX14986 toc01 50 100 VIN = 1600mVP-P, 1.5Gbps, PE = 0, EQ = 0 MAX14986 toc07 400 200 0 -200 -400 -600 -400 -200 0 200 400 200ps/div Maxim Integrated 4 Dual 6GT/s SAS/SATA Redriver with Equalization and Extended Temperature Operation MAX14986 Typical Operating Characteristics (continued) (VCC = +3.3V, TA = +25C, all eye diagrams measured using K28.5 pattern.) MAX14986 toc08 600 400 200 0 -200 -400 -600 -200 -100 0 100 VIN = 1600mVP-P, 6Gbps, PE = 0, EQ = 0 MAX14986 toc09 400 200 0 -200 -400 -600 200 -100 100ps/div -50 0 50 600 400 200 0 -200 -400 -600 600 400 200 0 -200 -400 -600 800 -100 0 100 MAX14986 toc12 0 -200 -400 -600 -100 -50 50 100 VIN = 500mVP-P WITH 20in FR4 STRIPLINE, 6GT/s, PE = 0, EQ = 0 MAX14986 toc14 EYE DIAGRAM VOLTAGE (200mV/div) EYE DIAGRAM VOLTAGE (200mV/div) 200 0 -200 -400 -600 www.maximintegrated.com 0 50ps/div 400 0 400 200 -800 200 600 100ps/div 200 400 MAX14986 toc13 -100 0 600 VIN = 500mVP-P WITH 20in FR4 STRIPLINE, 3GT/s, PE = 0, EQ = 0 -200 -200 VIN = 1600mVP-P, 6Gbps, PE = 1, EQ = 0 100ps/div -300 -400 200ps/div MAX14986 toc11 -200 MAX14986 toc10 50ps/div VIN = 1600mVP-P, 3Gbps, PE = 1, EQ = 0 -800 VIN = 1600mVP-P, 1.5Gbps, PE = 1, EQ = 0 -800 100 EYE DIAGRAM VOLTAGE (200mV/div) EYE DIAGRAM VOLTAGE (200mV/div) 800 800 EYE DIAGRAM VOLTAGE (200mV/div) VIN = 1600mVP-P, 3Gbps, PE = 0, EQ = 0 EYE DIAGRAM VOLTAGE (200mV/div) EYE DIAGRAM VOLTAGE (200mV/div) 600 100 200 300 600 400 200 0 -200 -400 -600 -150 -100 -50 0 50 100 150 50ps/div Maxim Integrated 5 Dual 6GT/s SAS/SATA Redriver with Equalization and Extended Temperature Operation MAX14986 Typical Operating Characteristics (continued) (VCC = +3.3V, TA = +25C, all eye diagrams measured using K28.5 pattern.) VIN = 500mVP-P WITH 20in FR4 STRIPLINE, 3GT/s, PE = 0, EQ = 1 VIN = 500mVP-P WITH 20in FR4 STRIPLINE, 6GT/s, PE = 0, EQ = 1 MAX14986 toc16 EYE DIAGRAM VOLTAGE (200mV/div) EYE DIAGRAM VOLTAGE (200mV/div) MAX14986 toc15 600 400 200 0 -200 -400 -600 -300 -200 -100 0 100 200 300 600 400 200 0 -200 -400 -600 -150 0 50 100 150 VIN = 275mVP-P, 3GT/s, PE = 0, EQ = 0, OUTPUT AFTER 20in FR4 STRIPLINE VIN = 275mVP-P, 6GT/s, PE = 0, EQ = 0, OUTPUT AFTER 20in FR4 STRIPLINE 500 400 300 MAX4952A toc18 EYE DIAGRAM VOLTAGE (100mV/div) EYE DIAGRAM VOLTAGE (100mV/div) -50 50ps/div MAX4952A toc17 200 100 0 -100 -200 -300 -400 -500 -300 -200 -100 0 100 200 500 400 300 200 100 0 -100 -200 -300 -400 -500 300 -150 -100 -50 0 50 100 150 100ps/div 50ps/div VIN = 275mVP-P, 3GT/s, PE = 1, EQ = 0, OUTPUT AFTER 20in FR4 STRIPLINE VIN = 275mVP-P, 6GT/s, PE = 1, EQ = 0, OUTPUT AFTER 20in FR4 STRIPLINE MAX14986 toc19 500 MAX14986 toc20 EYE DIAGRAM VOLTAGE (100mV/div) EYE DIAGRAM VOLTAGE (100mV/div) -100 100ps/div 400 300 200 100 0 -100 -200 -300 -400 -500 -300 -200 -100 0 100ps/div www.maximintegrated.com 100 200 300 500 400 300 200 100 0 -100 -200 -300 -400 -500 -150 -100 -50 0 50 100 150 50ps/div Maxim Integrated 6 Dual 6GT/s SAS/SATA Redriver with Equalization and Extended Temperature Operation MAX14986 Pin Description PIN NAME FUNCTION 1, 9, 16, 24 VCC Positive Supply Voltage Input. Bypass VCC to GND with 2.2F and 0.01F capacitors in parallel as close as possible to the device, recommended on each VCC pin. 2, 5, 8, 17, 20, 23, 25-28 GND Ground 3 IN0P Noninverting Input 0 4 IN0M 6 OUT1P Noninverting Output 1 7 OUT1M Inverting Output 1 10 EN 11 EQ0 Channel 0 Input Equalizer Logic Input. EQ0 is internally pulled down. 12 PE0 Channel 0 Output Preemphasis Logic Input. PE0 is internally pulled down. 13 EQ1 Channel 1 Input Equalizer Logic Input. EQ1 is internally pulled down. 14 PE1 Channel 1 Output Preemphasis Logic Input. PE1 is internally pulled down. 15 MODE 18 IN1M Inverting Input 1 19 IN1P Noninverting Input 1 21 OUT0M Inverting Output 0 22 OUT0P Noninverting Output 0 -- EP www.maximintegrated.com Inverting Input 0 Active-High Enable Input. Drive EN low to put device in standby mode. Drive EN high for normal operation. EN is internally pulled down. OOB Threshold Logic Input. MODE is internally pulled down. Exposed Pad. Internally connected to GND. EP must be electrically connected to a ground plane for proper thermal and electrical operation. Do not use EP as the sole ground connection. Maxim Integrated 7 Dual 6GT/s SAS/SATA Redriver with Equalization and Extended Temperature Operation MAX14986 Functional Diagram VCC MAX14986 VCC VCC 50 50 50 50 IN0P OUT0P IN0M OUT0M VCC VCC 50 50 50 50 OUT1M IN1M OUT1P IN1P EN CONTROL LOGIC GND EQ0 PE0 MODE EQ1 PE1 Typical Application Circuit MIDPLANE SAS CONTROLLER SAS/SATA HDD 18in SAS CABLE MAX14986 20in BOARD TRACES CONNECTORS www.maximintegrated.com MAINBOARD 8in BOARD TRACES Maxim Integrated 8 Dual 6GT/s SAS/SATA Redriver with Equalization and Extended Temperature Operation MAX14986 Detailed Description Input Equalization (EQ0, EQ1) The MAX14986 consists of two identical redrivers with input equalization and output preemphasis useful for SAS or SATA signals up to 6.0GT/s. Input/Output Terminations Inputs and outputs are internally 50 terminated to VCC (see the Functional Diagram) and must be AC-coupled using 12nF (max) capacitors to the SAS/SATA controller IC and SAS/SATA device for proper operation. Enable Input (EN) The MAX14986 features an active-high enable input (EN). EN has an internal pulldown resistor of 70k (typ). When EN is driven low or left unconnected, the MAX14986 enters low-power standby mode and the redrivers are disabled. Drive EN high for normal operation. Out-of-Band Threshold Selector (MODE) The MAX14986 provides full OOB signal support through high-speed amplitude detection circuitry. OOB differential input signals less than the internal OOB threshold (VSQDIFF) are detected as off and not passed to the output. This prevents the system from responding to unwanted noise. OOB differential input signals higher than VSQDIFF are detected as on and passed to the output, allowing OOB signals to transmit through the MAX14986. The logic level of the MODE input sets VSQ-DIFF for either SAS or SATA OOB signals (see Table 1). MODE has an internal pulldown resistor of 70k (typ). Table 1. Out-of-Band Logic Threshold (MODE) MODE OOB MODE 0 SAS 1 SATA www.maximintegrated.com The MAX14986 features control logic inputs (EQ0, EQ1) to enable input equalization on either channel, providing 3dB of boost (see Note 4 in the Electrical Characteristics table). Drive EQ0 or EQ1 high to enable input equalization on channel 0 or channel 1. Drive EQ0 or EQ1 low to disable input equalization on channel 0 or channel 1 (see Table 2). EQ0 and EQ1 have internal pulldown resistors of 70k (typ). Output Preemphasis (PE0, PE1) The MAX14986 features control logic inputs (PE0, PE1) to enable output preemphasis on either channel, providing 3dB of boost. The MAX14986 uses true preemphasis, so the transition signal is increased after a changing bit, thus increasing the total energy content of the signal when employed. Drive PE0 or PE1 high to enable output preemphasis on channel 0 or channel 1. Drive PE0 or PE1 low to disable output preemphasis on channel 0 or channel 1 (see Table 3). PE0 and PE1 have internal pulldown resistors of 70k (typ). Table 2. Input Equalization (EQ0, EQ1) EQ1 EQ0 CHANNEL 1 (dB) CHANNEL 0 (dB) 0 0 0 0 0 1 0 3 (typ) 1 0 3 (typ) 0 1 1 3 (typ) 3 (typ) Table 3. Output Preemphasis (PE0, PE1) PE1 PE0 CHANNEL 1 (dB) CHANNEL 0 (dB) 0 0 0 0 0 1 0 3 (typ) 1 0 3 (typ) 0 1 1 3 (typ) 3 (typ) Maxim Integrated 9 MAX14986 Applications Information Exposed Pad Package The exposed pad, 28-pin TQFN package incorporates features that provide a very low thermal resistance path for heat removal from the IC. The exposed pad on the MAX14986 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 high-speed inputs and outputs of the MAX14986. Place power-supply 2.2F and 0.01F bypass capacitors as close as possible to VCC, recommended on each VCC pin. Power-Supply Sequencing Caution: Do not exceed the absolute maximum ratings because stresses beyond the listed ratings can cause permanent damage to the device. Dual 6GT/s SAS/SATA Redriver with Equalization and Extended Temperature Operation Chip Information PROCESS: BiCMOS Ordering Information PART MAX14986ETI+ TEMP RANGE -40C to +85C PIN-PACKAGE 28 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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. 28 TQFN T283555+1 21-0184 90-0123 Proper power-supply sequencing is recommended for all devices. Always apply VCC before applying signals, especially if the signal is not current limited. www.maximintegrated.com Maxim Integrated 10 Dual 6GT/s SAS/SATA Redriver with Equalization and Extended Temperature Operation MAX14986 Revision History REVISION NUMBER REVISION DATE 0 3/13 DESCRIPTION Initial release PAGES CHANGED -- For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated 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 and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2013 Maxim Integrated Products, Inc. 11 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX14986ETI+T MAX14986EVKIT# MAX14986ETI+