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19-4178; Rev 0; 6/08
SATA I/SATA II Bidirectional Re-Driver
General Description
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 50 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 0C to +70C operating temperature range. 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 o Internal Input/Output 50 Termination Resistors o In-Line Signal Traces for Flow-Through Layout o Space-Saving, 4mm x 4mm, TQFN Package
Features
MAX4951
Ordering Information
PART MAX4951CTP+ TEMP RANGE 0C to +70C PIN-PACKAGE 20 TQFN-EP*
+Denotes a lead-free/RoHS-compliant package. *EP = Exposed pad.
Applications
Servers Desktop Computers Notebook Computers Docking Stations Data Storage/Workstations
VCC 16 GND 17 GND 18 GND 19 *EP VCC 20 1 HAP 2 HAM 3 GND 4 HBM 5 HBP 6 VCC
Pin Configuration
TOP VIEW
DAM DBM 12 DAP GND DBP 11 10 9 VCC BA BB EN
15
14
13
MAX4951
8 7
TQFN 4mm x 4mm
*CONNECT EXPOSED PAD (EP) TO GND.
________________________________________________________________ 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.
SATA I/SATA II Bidirectional Re-Driver MAX4951
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 = +70C) 20-Pin TQFN (derate 25.6mW/C above +70C) ..... 2051mW Junction-to-Case Thermal Resistance (JC) (Note 1) 20-Pin TQFN...................................................................6C/W Junction-to-Ambient Thermal Resistance (JA) (Note 1) 20-Pin TQFN.................................................................39C/W Operating Temperature Range...............................0C to +70C Storage Temperature Range .............................-55C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = 50, TA = 0C to +70C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25C.) (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 AC PERFORMANCE f = 150MHz to 300MHz f = 300MHz to 600MHz Differential Input Return Loss (Note 4) RLRX-DIFF f = 600MHz to 1200MHz f = 1.2GHz to 2.4GHz f = 2.4GHz to 3.0GHz f = 3.0GHz to 5.0GHz f = 150MHz to 300MHz f = 300MHz to 600MHz Common-Mode Input Return Loss (Note 4) RLRX-CM f = 600MHz to 1200MHz f = 1.2GHz to 2.4GHz f = 2.4GHz to 3.0GHz f = 3.0GHz to 5.0GHz -29 -26 -22 -18 -15 -14 -18 -14 -10 -8 -3 -1 -5 -5 -2 -2 -2 -1 dB dB SYMBOL VCC ICC ISTBY ZRX-SE-DC ZRX-DIFF-DC ZTX-SE-DC ZTX-DIFF-DC BA = BB = VCC BA = BB = GND EN = GND 40 85 40 85 100 115 100 115 CONDITIONS MIN 3.0 90 70 7 TYP MAX 3.6 125 100 10 UNITS V mA mA
2
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SATA I/SATA II Bidirectional Re-Driver
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.0V to +3.6V, CL = 10nF, RL = 50, TA = 0C to +70C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25C.) (Note 3)
PARAMETER SYMBOL CONDITIONS f = 150MHz to 300MHz f = 300MHz to 600MHz Differential Output Return Loss (Note 4) RLTX-DIFF f = 600MHz to 1200MHz f = 1.2GHz to 2.4GHz f = 2.4GHz to 3.0GHz f = 3.0GHz to 5.0GHz f = 150MHz to 300MHz f = 300MHz to 600MHz Common-Mode Output Return Loss (Note 4) RLTX-CM f = 600MHz to 1200MHz f = 1.2GHz to 2.4GHz f = 2.4GHz to 3.0GHz f = 3.0GHz to 5.0GHz Differential Input Signal Range Differential Output Swing Propagation Delay Output Rise/Fall Time Deterministic Jitter Random Jitter OOB Detector Threshold OOB Output Startup/Shutdown Time Crosstalk LOGIC INPUT Input Logic-High Input Logic-Low Input Logic Hysteresis VIH VIL VHYST 0.1 1.4 0.6 V V V VRX-DFF-PP VTX-DFF-PP tPD tR TTX-DJ-DFF TTX-RJ-DFF VTH-OOB tOOB CTK (Notes 4, 5) Up to 6.0Gbps (Notes 4, 6) Up to 6.0Gbps (Notes 4, 6) SATA OOB (Note 7) f 1.5GHz BA = BB = GND BA = BB = VCC 50 2 -35 -30 SATA 1.5Gbps/3.0Gbps f = 750MHz BA = BB = GND BA = BB = VCC 220 450 770 525 930 240 60 15 1.8 150 5 MIN TYP -32 -26 -21 -16 -15 -13 MAX -14 -8 -6 -6 -3 -1 -8 -5 -2 -2 -2 -1 1600 650 1144 mVP-P mVP-P ps ps psP-P psRMS mVP-P ns dB dB dB UNITS
MAX4951
Note 3: Note 4: Note 5: Note 6: Note 7:
All devices are 100% production tested at TA = +70C. 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.
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SATA I/SATA II Bidirectional Re-Driver MAX4951
Typical Operating Characteristics
(VCC = 3.3V, TA = +25C, all eye diagrams measured using K28.5 pattern.)
BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 1.5Gbps)
MAX4951 toc01
BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 3.0Gbps)
300 EYE DIAGRAM VOLTAGE (mV) 200 100mV/div 100 0 -100 -200 -300 -300 -200 -100 0 100ps/div 100 200 300
MAX4951 toc02
BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 6.0Gbps)
300 EYE DIAGRAM VOLTAGE (mV) 200 100mV/div -150 -100 -50 0 50ps/div 50 100 150 100 0 -100 -200 -300
MAX4951 toc03
300 EYE DIAGRAM VOLTAGE (mV) 200
0 -100 -200 -300 -600 -400 -200 0 200ps/div 200 400
600
100mV/div
100
BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 1.5Gbps)
MAX4951 toc04
BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 3.0Gbps)
MAX4951 toc05
BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 6.0Gbps)
300 EYE DIAGRAM VOLTAGE (mV) 200 100mV/div -150 -100 -50 0 50ps/div 50 100 150 100 0 -100 -200 -300
MAX4951 toc06
300 EYE DIAGRAM VOLTAGE (mV) 200
300 EYE DIAGRAM VOLTAGE (mV) 200
100mV/div
0 -100 -200 -300 -600 -400 -200 0 200ps/div 200 400 600
0 -100 -200 -300 -300 -200 -100 0 100ps/div 100 200 300
BA = BB = VCC EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 1.5Gbps)
MAX4951 toc07
BA = BB = VCC EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 3.0Gbps)
MAX4951 toc08
100mV/div
100
100
BA = BB = VCC EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 6.0Gbps)
500 400 300 200 100 0 -100 -200 -300 -400 -500 -150 -100 -50 0 50ps/div 50 100 200mV/div 150
MAX4951 toc09
600 400 200
EYE DIAGRAM VOLTAGE (mV)
EYE DIAGRAM VOLTAGE (mV)
0 -200 -400 -600 -600 -400 -200 0 200ps/div 200 400 600
200 100 0 -100 -200 -300 -400 -500 -300 -200 -100 0 100ps/div 100 200
300
4
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EYE DIAGRAM VOLTAGE (mV)
500 400 300
200mV/div
200mV/div
SATA I/SATA II Bidirectional Re-Driver MAX4951
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25C, all eye diagrams measured using K28.5 pattern.)
BA = BB = VCC EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 1.5Gbps)
MAX4951 toc10
BA = BB = VCC EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 3.0Gbps)
MAX4951 toc11
BA = BB = VCC EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 6.0Gbps)
MAX4951 toc12
600 400 200
600 400 200
600 400 200 0 -200 -400 -600
EYE DIAGRAM VOLTAGE (mV)
EYE DIAGRAM VOLTAGE (mV)
EYE DIAGRAM VOLTAGE (mV)
200mV/div
200mV/div
0 -200 -400 -600 -600 -400 -200 0 200ps/div 200 400 600
0 -200 -400 -600 -300 -200 -100 0 100ps/div 100 200 300
-150
-100
-50
0 50ps/div
50
100
150
DIFFERENTIAL INPUT RETURN LOSS vs. FREQUENCY
MAX4951 toc13
DIFFERENTIAL OUTPUT RETURN LOSS vs. FREQUENCY
DIFFERENTIAL OUTPUT RETURN LOSS (dB) 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 0 1 2 3 FREQUENCY (GHz) 4 5 MAX4951 SATA MASK
MAX4951 toc14
5 DIFFERENTIAL INPUT RETURN LOSS (dB) 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 0 1 2 3 FREQUENCY (GHz) 4 5 MAX4951 SATA MASK
5
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5
200mV/div
SATA I/SATA II Bidirectional Re-Driver MAX4951
Pin Description
PIN 1 2 3, 13, 17, 18, 19 4 5 6, 10, 16, 20 7 8 9 11 12 14 15 -- NAME HAP HAM GND HBM HBP VCC EN BB BA DBP DBM DAM DAP EP Noninverting Input from Host Channel A Inverting Input from Host Channel A Ground Inverting Output to Host Channel B Noninverting Output to Host Channel B Positive Supply Voltage Input. Bypass VCC to GND with 0.1F and 0.001F capacitors in parallel and as close to the device as possible. Active-High Enable Input. Drive EN low to put device in standby mode. Drive EN high for normal operation. EN is internally pulled down. 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. 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. Noninverting Input from Device Channel B Inverting Input from Device Channel B Inverting Output to Device Channel A 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. FUNCTION
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.
Enable Input
The MAX4951 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 MAX4951 enters low-power standby mode and the buffers are disabled. Drive EN high for normal operation.
Input/Output Terminations
Inputs and outputs are internally 50 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.
Output Boost Selection Inputs
The MAX4951 has two digital control logic inputs, BA and BB. BA and BB have internal pulldown resistors of 70k (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.
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.
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Applications Information
Figure 1 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.
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SATA I/SATA II Bidirectional Re-Driver
Functional Diagram/Truth Table
VCC
MAX4951
VCC
MAX4951
VCC
50 HAP HAM VCC
50
50
50 DAP DAM VCC
50 HBM HBP
50
50
50 DBM DBP
CONTROL LOGIC GND BA BB EN
MAX4951 EN 0 1 1 1 1 BA X 0 1 0 1 BB X 0 0 1 1 CHANNEL A Standby Standard SATA Boost Standard SATA Boost CHANNEL B Standby Standard SATA Standard SATA 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.
Power-Supply Sequencing
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.
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.
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SATA I/SATA II Bidirectional Re-Driver MAX4951
+3.3V
0.1F
0.001F
10nF (X7R) HAP Tx SATA HOST CONTROLLER 10nF (X7R) HAM 10nF (X7R) HBM Rx 10nF (X7R) HBP EN BA BB DBP GND DAM DAP
10nF (X7R) eSATA DEVICE CONNECTOR
10nF (X7R)
Rx
MAX4951
DBM
10nF (X7R)
10nF (X7R)
Tx
GPIO
+3.3V
Figure 1. Typical Application Circuit
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information, go to www.maxim-ic.com/packages. PACKAGE TYPE 20 TQFN-EP PACKAGE CODE T2044-2 DOCUMENT NO. 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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2008 Maxim Integrated Products
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is a registered trademark of Maxim Integrated Products, Inc.

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