19-5127; Rev 1; 7/12 TION KIT EVALUA BLE A IL A V A SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization The MAX4986 active 2:1/1:2 multiplexer/demultiplexer equalizes and redrives SAS/SATA or SATA-only signals up to 6.0Gbps and operates from a single +3.3V supply. The MAX4986 features independent input equalization and output preemphasis. The MAX4986 enhances signal integrity at the receiver by equalizing the signal at the input and establishing preemphasis at the output of the device. SAS/SATA and SATA-only 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 internally 50I terminated and must be AC-coupled to the SAS/SATA controller IC and SAS/SATA device. The MAX4986 is available in a small (3.5mm x 9.0mm), 42-pin TQFN package optimal for simplified layout and space-saving requirements. The MAX4986C is specified over the 0NC to +70NC commercial operating temperature range. The MAX4986E is specified over the -40NC to +85NC extended temperature range. Applications Features SSingle +3.3V Supply Operation SLow-Power, 1mA (typ) Standby Active-High Enable (EN) for Use with Power Good Active-Low Enable (EN) for Cable-Detect Function SSupports SAS I/II/III P 6.0Gbps SIndependent Programmable Input Equalization Two Levels: 0dB, 4dB SIndependent Programmable Output Preemphasis Two Levels: 0dB, 3dB SIndependent Programmable Output Level Selection SSupports SAS/SATA OOB-Level Signaling Programmable SAS/SATA Threshold SCable-Detect Feature for Low Power Consumption SOn-Chip 50I Input/Output Terminations SInline Signal Traces for Simplified Layout SSpace-Saving, 3.5mm x 9.0mm TQFN Package with Exposed Pad Ordering Information PC Servers Workstations Desktops Docking Stations PART MAX4986CTO+ TEMP RANGE 0NC to +70NC PIN-PACKAGE 42 TQFN-EP* MAX4986ETO+ -40NC to +85NC 42 TQFN-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. 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 MAX4986 General Description MAX4986 SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization 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 IN_P, IN_M, OUT_P, OUT_M ......... Q30mA Peak Current IN_P, IN_M, OUT_P, OUT_M for 1Fs ..... Q100mA Continuous Power Dissipation (TA = +70NC) 42-Pin TQFN (derate 34.5mW/NC above +70NC) ..... 2758mW Operating Temperature Range ......................... -40NC to +85NC 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. ELECTRICAL CHARACTERISTICS (VCC = +3.0V to +3.6V, CCL = 10nF coupling capacitor on each input and output, RL = 50I on each input and output, TA = 0NC to +70NC (MAX4986C), TA = -40NC to +85NC (MAX4986E), unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25NC.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 3.6 V DC PERFORMANCE Power-Supply Range Standby Current Supply Current VCC ISTBY ICC 3.0 2.5 4 1.0 2 OUTPE = PEA = PEB = 0, INEQ = EQA = EQB = 0 145 170 OUTPE = PEA = PEB = 1, INEQ = EQA = EQB = 1 185 EN = 0 or EN = 1, VCC = 3.6V EN = 0 or EN = 1, VCC = 3.3V mA mA 230 Input Termination, Single-Ended RRX-SE DC 42.5 57.5 I Output Termination, SingleEnded RTX-SE DC 42.5 57.5 I AC PERFORMANCE Input Return Loss, Differential (Note 3) SDD11 Input Return Loss, Common Mode (Note 3) SCC11 Output Return Loss, Differential (Note 3) SDD22 Output Return Loss, Common Mode (Note 3) SCC22 Differential Input Voltage Input Equalization Differential Output Voltage 2 VIN-DIFF EQ VOUT-DIFF 0.1GHz < f P 0.3GHz -10 0.3GHz < f P 3.0GHz -7.9 3.0GHz < f P 6.0GHz 0 0.1GHz < f P 0.3GHz -6 0.3GHz < f P 3.0GHz -5 3.0GHz < f P 6.0GHz 0 0.1GHz < f P 0.3GHz -10 0.3GHz < f P 3.0GHz -7.9 3.0GHz < f P 6.0GHz 0 0.1GHz < f P 0.3GHz -6 0.3GHz < f P 3.0GHz -5 3.0GHz < f P 6.0GHz 0 SAS 1.5Gbps, 3Gbps, MODE_ = 0 275 1600 SAS 6Gbps, MODE_ = 0 300 1600 SATA 1.5Gbps, 3Gbps, 6Gbps, MODE_ = 1 225 1600 f = 1.5GHz, INEQ = 1 f = 0.75GHz, 1.5GHz, PE_ = 0 4 dB dB dB dB mVP-P dB OAMP_ = 0 700 1200 OAMP_ = 1 425 700 mVP-P SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization (VCC = +3.0V to +3.6V, CCL = 10nF coupling capacitor on each input and output, RL = 50I on each input and output, TA = 0NC to +70NC (MAX4986C), TA = -40NC to +85NC (MAX4986E), unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25NC.) (Note 2) PARAMETER SYMBOL Output Preemphasis PE Propagation Delay tPD Output Transition Time tTX-RF Differential Output Skew Same Pair tSK Deterministic Jitter tDJ Random Jitter tTX-RJ-DD CONDITIONS MIN f = 1.5GHz, PE_ = 1, Figure 1 f < 3.0GHz, PE_ = 0 (Notes 3, 4) 40 TYP UNITS dB 300 ps 60 ps 10 ps K28.5Q pattern, PE_ = 0, EQ_ = 0 (Note 3) D10.2 pattern, PE_ = 0, EQ_ = 0 MAX 3 1 20 psP-P 1.5 psRMS MODE_ = 0 120 220 MODE_ = 1 50 150 OOB Squelch Threshold VSQ-DIFF f = 0.75GHz (Note 3) mVP-P OOB Squelch Time tOOB,SQ f = 0.75GHz (Note 3) 5 10 ns OOB Exit Time tOOB,EX f = 0.75GHz (Note 3) 5 10 ns OOB Differential-Offset Delta Difference between OOB and active-mode DVOOB,DIFF output offset -80 80 mV OOB Common-Mode Delta DVOOB,CM Difference between OOB and active-mode output VCM -50 50 mV OOB Output Disable VOOB,OUT OOB-disabled output level 30 mVP-P CONTROL LOGIC Input Logic-High VIH Input Logic-Low VIL Input Logic Hysteresis Pullup/Pulldown Input Resistor 1.4 V 0.6 V VHYST 0.1 V RUP/DOWN 330 kI Note 2: MAX4986C devices are 100% production tested at TA = +70°C. MAX4986E devices are 100% production tested at TA = +85°C. Specifications for all temperature limits are guaranteed by design. Note 3: Guaranteed by design. Note 4: Rise and fall times are measured using 20% and 80% levels. VLOW_P-P PE(dB) = 20log VHIGH_P-P VHIGH_P-P VLOW_P-P Figure 1. Output Preemphasis 3 MAX4986 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) VIN = 275mVP-P, 1.5Gbps, PE = 0, EQ = 0 VIN = 275mVP-P, 3.0Gbps, PE = 0, EQ = 0 MAX4986 toc01 600 200 200mV/div 200 200mV/div 200 200mV/div 400 0 0 0 -200 -200 -200 -400 -400 -400 -600 -600 -400 -200 0 200 400 MAX4986 toc03 600 400 -600 -600 600 -300 -200 -100 200ps/div 0 100 200 300 -150 VIN = 275mVP-P, 1.5Gbps, PE = 1, EQ = 0 400 400 200 200 200 200mV/div 400 200mV/div 600 0 -200 -200 -400 -400 -400 -600 -600 -600 -800 -200 0 200 400 600 -200 -100 0 100 200 300 -150 200 200 200mV/div 200 200mV/div 400 0 0 -200 -200 -400 -400 -400 0 200ps/div 4 200 400 600 50 100 150 -600 MAX4986 toc09 0 -200 -600 0 600 400 -200 -50 VIN = 1600mVP-P, 6.0Gbps, PE = 0, EQ = 0 MAX4986 toc08 600 400 -400 -100 50ps/div VIN = 1600mVP-P, 3.0Gbps, PE = 0, EQ = 0 MAX4986 toc07 -600 MAX4986 toc06 100ps/div VIN = 1600mVP-P, 1.5Gbps, PE = 0, EQ = 0 150 -800 -300 200ps/div 600 100 0 -200 -800 50 800 600 0 0 VIN = 275mVP-P, 6.0Gbps, PE = 1, EQ = 0 MAX4986 toc05 800 600 -400 -50 50ps/div VIN = 275mVP-P, 3.0Gbps, PE = 1, EQ = 0 MAX4986 toc04 -600 -100 100ps/div 800 200mV/div VIN = 275mVP-P, 6.0Gbps, PE = 0, EQ = 0 MAX4986 toc02 600 400 200mV/div MAX4986 SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization -600 -300 -200 -100 0 100ps/div 100 200 300 -150 -100 -50 0 50ps/div 50 100 150 SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization VIN = 1600mVP-P, 3.0Gbps, PE = 1, EQ = 0 VIN = 1600mVP-P, 1.5Gbps, PE = 1, EQ = 0 MAX4986 toc10 600 600 400 400 200 200 0 MAX4986 toc11 800 200mV/div 200mV/div 800 0 -200 -200 -400 -400 -600 -600 -800 -800 -600 -400 -200 0 200 400 -300 600 -200 -100 0 100 200 300 200ps/div 100ps/div VIN = 1600mVP-P, 6.0Gbps, PE = 1, EQ = 0 VIN = 500mVP-P WITH 12in FR4 STRIPLINE INPUT, 3.0Gbps, PE = 0, EQ = 0 MAX4986 toc12 800 MAX4986 toc13 600 600 400 200 200 200mV/div 200mV/div 400 0 -200 0 -200 -400 -400 -600 -800 -150 -100 -50 0 50 -600 150 -300 -200 -100 0 100 200 300 50ps/div 100ps/div VIN = 500mVP-P WITH 12in FR4 STRIPLINE INPUT, 6.0Gbps, PE = 0, EQ = 0 VIN = 500mVP-P WITH 12in FR4 STRIPLINE INPUT, 3.0Gbps, PE = 0, EQ = 1 MAX4986 toc14 600 400 400 200 200 0 MAX4986 toc15 600 200mV/div 200mV/div 100 0 -200 -200 -400 -400 -600 -600 -150 -100 -50 0 50ps/div 50 100 150 -300 -200 -100 0 100 200 300 100ps/div 5 MAX4986 Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) VIN = 500mVP-P WITH 12in FR4 STRIPLINE INPUT, 6.0Gbps, PE = 0, EQ = 1 MAX4986 toc17 600 400 400 200 200 200mV/div 200mV/div VIN = 275mVP-P, 3.0Gbps, PE = 0, EQ = 0 OUTPUT AFTER 12in FR4 STRIPLINE MAX4986 toc16 600 0 0 -200 -200 -400 -400 -600 -600 -150 -100 -50 0 50 100 150 -300 -200 -100 0 100 200 300 50ps/div 100ps/div VIN = 275mVP-P, 6.0Gbps, PE = 0, EQ = 0 OUTPUT AFTER 12in FR4 STRIPLINE VIN = 275mVP-P, 3.0Gbps, PE = 1, EQ = 0 OUTPUT AFTER 12in FR4 STRIPLINE MAX4986 toc18 500 MAX4986 toc19 600 400 400 300 200 200 100 200mV/div 100mV/div 0 -100 0 -200 -200 -300 -400 -400 -500 -600 -150 -100 -50 0 50 100 150 -300 50ps/div VIN = 275mVP-P, 6.0Gbps, PE = 1, EQ = 0 OUTPUT AFTER 12in FR4 STRIPLINE MAX4986 toc20 600 400 200 0 -200 -400 -600 -150 -100 -50 0 50ps/div 6 -200 -100 0 100ps/div 200mV/div MAX4986 SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization 50 100 150 100 200 300 SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization VCC GND INBM INBP GND INAM INAP GND EN GND OUTBM OUTBP GND OUTAM OUTAP GND VCC TOP VIEW 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 EQA PEA 39 20 EQB PEB 40 MAX4986 19 OUTPE *EP 7 8 9 VCC OAMPB GND INP INM GND SEL1 SEL2 18 OAMP 10 11 12 13 14 15 16 17 MODEA 6 GND 5 OUTM 4 OUTP 3 GND 2 EN 1 OAMPA + MODEB MODE 42 VCC INEQ 41 TQFN *CONNECT EXPOSED PAD TO GND. Pin Description PIN NAME FUNCTION 1, 17, 22, 38 VCC Power-Supply Input. Bypass VCC to GND with 1FF and 0.01FF capacitors in parallel as close to the device as possible; recommended for each VCC pin. 2 OAMPA OUTAP/OUTAM Output Level Selection. Drive OAMPA high for low output amplitude. Drive OAMPA low or leave unconnected for high output amplitude. See the Electrical Characteristics table. OAMPA is internally pulled down by a 330kI (typ) resistor. 3 OAMPB OUTBP/OUTBM Output Level Selection. Drive OAMPB high for low output amplitude. Drive OAMPB low or leave unconnected for high output amplitude. See the Electrical Characteristics table. OAMPB is internally pulled down by a 330kI (typ) resistor. 4, 7, 11, 14, 23, 26, 29, 31, 34, 37 GND 5 INP Channel 1 Noninverting Input 6 INM Channel 1 Inverting Input 8 SEL1 Channel 1 Active-Output Selection Input. Drive SEL1 low or leave unconnected to activate A outputs. Drive SEL1 high to activate B outputs. SEL1 is internally pulled down by a 330kI (typ) resistor. 9 SEL2 Channel 2 Active-Input Selection Input. Drive SEL2 low or leave unconnected to activate A inputs. Drive SEL2 high to activate B inputs. SEL2 is internally pulled down by a 330kI (typ) resistor. 10 EN Enable Input. Drive EN low or leave unconnected for reduced power standby mode. Drive EN high for normal operation. See Table 1. EN is internally pulled down by a 330kI (typ) resistor. Ground 12 OUTP Channel 2 Noninverting Output 13 OUTM Channel 2 Inverting Output 7 MAX4986 Pin Configuration SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization MAX4986 Pin Description (continued) PIN 8 NAME FUNCTION 15 MODEA INAP/INAM OOB-Mode Logic Input. Drive MODEA low or leave unconnected for SAS OOB threshold. Drive MODEA high for SATA OOB threshold. MODEA is internally pulled down by a 330kI (typ) resistor. 16 MODEB INBP/INBM OOB-Mode Logic Input. Drive MODEB low or leave unconnected for SAS OOB threshold. Drive MODEB high for SATA OOB threshold. MODEB is internally pulled down by a 330kI (typ) resistor. 18 OAMP OUTP/OUTM Output Level Selection. Drive OAMP high for low output amplitude. Drive OAMP low or leave unconnected for high output amplitude. See the Electrical Characteristics table. OAMP is internally pulled down by a 330kI (typ) resistor. 19 OUTPE OUTP/OUTM Output Preemphasis Logic Input. Drive OUTPE low or leave unconnected for no output preemphasis. Drive OUTPE high for 3dB (typ) output preemphasis. OUTPE is internally pulled down by a 330kI (typ) resistor. 20 EQB INBP/INBM Input Equalization Logic Input. Drive EQB low or leave unconnected for no input equalization. Drive EQB high for 4dB (typ) input equalization. EQB is internally pulled down by a 330kI (typ) resistor. 21 EQA INAP/INAM Input Equalization Logic Input. Drive EQA low or leave unconnected for no input equalization. Drive EQA high for 4dB (typ) input equalization. EQA is internally pulled down by a 330kI (typ) resistor. 24 INBM Channel 2 Inverting Input B 25 INBP Channel 2 Noninverting Input B 27 INAM Channel 2 Inverting Input A 28 INAP Channel 2 Noninverting Input A 30 EN 32 OUTBM Channel 1 Inverting Output B 33 OUTBP Channel 1 Noninverting Output B 35 OUTAM Channel 1 Inverting Output A 36 OUTAP Channel 1 Noninverting Output A 39 PEA OUTAP/OUTAM Output Preemphasis Logic Input. Drive PEA low or leave unconnected for no output preemphasis. Drive PEA high for 3dB (typ) output preemphasis. PEA is internally pulled down by a 330kI (typ) resistor. 40 PEB OUTBP/OUTBM Output Preemphasis Logic Input. Drive PEB low or leave unconnected for no output preemphasis. Drive PEB high for 3dB (typ) output preemphasis. PEB is internally pulled down by a 330kI (typ) resistor. 41 INEQ INP/INM Input Equalization Logic Input. Drive INEQ low or leave unconnected for no input equalization. Drive INEQ high for 4dB (typ) input equalization. INEQ is internally pulled down by a 330kI (typ) resistor. 42 MODE INP/INM OOB-Mode Logic Input. Drive MODE low or leave unconnected for SAS OOB threshold. Drive MODE high for SATA OOB threshold. MODE is internally pulled down by a 330kI (typ) resistor. — EP Active-Low Enable Input. Drive EN high or leave unconnected for reduced power standby mode. Drive EN low for normal operation. See Table 1. EN is internally pulled up by a 330kI (typ) resistor. Exposed Pad. Internally connected to GND. Connect EP to a large ground plane to maximize thermal performance. SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization VCC PEA PEB OAMPA OAMPB INEQ MODE SEL1 VCC CHANNEL 1 CONTROL OUTAP VCC VCC INP OUTBP INM EN EN OUTAM VCC GLOBAL CONTROL OUTBM VCC INAP OUTP VCC INAM OUTM SEL2 EQA EQB OUTPE OAMP MODEA MODEB INBP INBM CHANNEL 2 CONTROL MAX4986 GND 9 MAX4986 Functional Diagram MAX4986 SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization Detailed Description The MAX4986 is an active 2:1/1:2 multiplexer/demultiplexer designed to equalize and redrive SAS/SATA (Enterprise Class, SATA _X) or SATA-only signals up to 6.0Gbps. Input/Output Terminations Inputs and outputs are internally 50I terminated to VCC 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 Inputs (EN, EN) The MAX4986 features both an active-high enable input (EN) and an active-low enable input (EN). EN has an internal pulldown resistor of 330kI (typ), and EN has an internal pullup resistor of 330kI (typ). When EN is driven low or left unconnected, or when EN is driven high or Table 1. Standby Mode EN STATUS 0 EN X Reduced Power Standby X 1 Reduced Power Standby 1 0 Active left unconnected, the MAX4986 enters reduced power standby mode and the redrivers are disabled. In standby mode, supply current is reduced to 350FA (typ). Drive EN high and EN low for normal operation. See Table 1. EN is useful as an automated cable-detect. See the Typical Application Circuits. Active Input/Output Select (SEL1, SEL2) SEL1 selects the active output for channel 1 and SEL2 selects the active input for channel 2. Drive SEL1 or SEL2 low or leave unconnected to activate A inputs or outputs. Drive SEL1 or SEL2 high to activate B inputs or outputs. See Table 2. SEL1 and SEL2 have internal pulldown resistors of 330kI (typ). Programmable Output Preemphasis (OUTPE, PEA, PEB) The MAX4986 features independent output preemphasis capable of providing 3dB preemphasis on each channel. When OUTPE, PEA, or PEB are driven low or left unconnected, the corresponding output has no preemphasis. When OUTPE, PEA, or PEB are driven high, the corresponding output has 3dB preemphasis. See Table 3. OUTPE, PEA, and PEB have internal pulldown resistors of 330kI (typ). Output preemphasis should be used when driving long traces or cables. X = Don’t care. Programmable Input Equalization (INEQ, EQA, EQB) Table 2. Active Input/Output Select SEL1 SEL2 ACTIVE OUTPUT ACTIVE INPUT X 0 X INAP/INAM X 1 X INBP/INBM 0 X OUTAP/OUTAM X 1 X OUTBP/OUTBM X X = Don’t care. The MAX4986 features independent input equalization capable of providing 4dB of high-frequency equalization on each channel. When INEQ, EQA, or EQB are driven low or left unconnected, the corresponding input has no equalization. When INEQ, EQA, or EQB are driven high, the corresponding input has 4dB equalization. See Table 4. INEQ, EQA, and EQB have internal pulldown resistors of 330kI (typ). Input equalization should be used for long traces or cables. Table 3. Output Preemphasis OUTPE PEA PEB OUTP/OUTM OUTAP/OUTAM OUTBP/OUTBM 0 X X 0dB X X 1 X X 3dB X X X 0 X X 0dB X X 1 X X 3dB X X X 0 X X 0dB X X 1 X X 3dB X = Don’t care. 10 SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization INEQ EQA EQB INP/INM INAP/INAM INBP/INBM X 0 X X 0dB X 1 X X 4dB X X X 0 X X 0dB X X 1 X X 4dB X X X 0 X X 0dB X X 1 X X 4dB MODEA MODEB INP/INM INAP/INAM INBP/INBM 0 X X SAS X X 1 X X SATA X X X = Don’t care. Table 5. OOB Mode Select MODE X 0 X X SAS X X 1 X X SATA X X X 0 X X SAS X X 1 X X SATA OUTAP/OUTAM OUTBP/OUTBM X = Don’t care. Table 6. Output Amplitude Selection OAMP OAMPA OAMPB OUTP/OUTM 0 X X HIGH* X X 1 X X LOW* X X X 0 X X HIGH* X X 1 X X LOW* X X X 0 X X HIGH* X X 1 X X LOW* X = Don’t care. *See the Electrical Characteristics table. SAS/SATA Mode Inputs (MODE, MODEA, MODEB) The MAX4986 supports both SAS and SATA OOB levels. When MODE, MODEA, or MODEB are driven low or left unconnected, the corresponding input’s OOB threshold is 120mVP-P (min) (SAS mode). When MODE, MODEA, or MODEB are driven high, the corresponding input’s OOB threshold is 50mVP-P (min) (SATA mode). Signals below the OOB threshold are squelched to prevent unwanted noise from being redriven at the output. See Table 5. MODE, MODEA, and MODEB have internal pulldown resistors of 330kI (typ). Output Amplitude Selection Inputs (OAMP, OAMPA, OAMPB) The MAX4986 features independent output amplitude selection. When OAMP, OAMPA, or OAMPB are driven high, the corresponding output amplitude is low. When OAMP, OAMPA, or OAMPB are driven low or left unconnected, the corresponding output amplitude is high. See Table 6. OAMP, OAMPA, and OAMPB have internal pulldown resistors of 330kI (typ). 11 MAX4986 Table 4. Input Equalization MAX4986 SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization Typical Application Circuits INA Rx INB OUT SEL1 GPIO HOST B SEL2 Tx OUTA Rx OUTB CONNECTOR Tx SAS DRIVE MAX4986 CONNECTOR HOST A MAIN BOARD IN EN MIDPLANE (FR4) NOTE: TWO HOSTS SHARING A SINGLE SAS DRIVE WITH CABLE-DETECT. MAIN BOARD Tx CONNECTOR MAX4986 OUTA IN EN GPIO SEL2 CONNECTOR SEL1 HOST INA Rx SAS DRIVE A CONNECTOR OUTB OUT INB SAS DRIVE B MIDPLANE (FR4) NOTE: SINGLE HOST WITH TWO SAS DRIVES AND CABLE-DETECT. Applications Information Layout Circuit board layout and design can significantly affect the performance of the MAX4986. Use good, high-frequency design techniques, including minimizing ground inductance and using controlled impedance transmission lines on data signals. It is recommended to place 1FF and 0.01FF power-supply bypass capacitors in parallel as close to VCC as possible for each VCC pin. Always connect VCC to a power plane. 12 Exposed-Pad Package The exposed-pad, 42-pin TQFN package incorporates features that provide a very low-thermal resistance path for heat removal from the IC. The exposed pad on the MAX4986 must be soldered to the circuit board ground plane for proper thermal performance. For more information on exposed-pad packages, refer to Maxim Application Note 862: HFAN-08.1: Thermal Considerations of QFN and Other Exposed-Paddle Packages. SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization 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. Chip Information PROCESS: BiCMOS Package Information 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. 42 TQFN-EP T423590+1 21-0181 90-0078 13 MAX4986 Power-Supply Sequencing Caution: Do not exceed the absolute maximum ratings because stresses beyond the listed ratings may cause permanent damage to the device. SAS/SATA Single Lane 2:1/1:2 Multiplexer/ Demultiplexer Plus Redriver with Equalization MAX4986 Revision History REVISION NUMBER REVISION DATE 0 1/10 Initial release 1 7/12 Added MAX4986ETO+ to data sheet DESCRIPTION PAGES CHANGED — 1, 2, 3 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. 14 © Maxim Integrated Products, Inc. 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 2012 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.