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MAX4951BECTP+-MAX4951BECTP+T-MAX4951BECTP+TGH7
SATA I/II/III Bidirectional Redriver with Input Equalization and Preemphasis
SATA I/II/III Bidirectional Redriver
with Input Equalization and Preemphasis
19-5023; Rev 1; 11/10
General Description
The MAX4951BE dual-channel buffer is ideal to redrive
serial ATA (SATA) I, SATA II, and SATA III signals and
features high electrostatic discharge (ESD) Q8kV Human
Body Model (HBM) protection. The MAX4951BE can be
placed nearly anywhere on the motherboard to over-
come board losses and produce an eSATA-compatible
signal level. This device is SATA specification v.2.6 (gold
standard)-compliant, while overcom ing losses in the
PCB and eSATA connector.
The MAX4951BE features very low standby current for
power-sensitive applications. This device features hard-
ware SATA-drive cable detection, keeping the power low
in standby mode. The device also features an indepen-
dent channel, dynamic power-down mode where power
consumption is reduced when no input signal is present.
The MAX4951BE preserves signal integrity at the receiv-
er by reestablishing full output levels and can reduce
the total system jitter (TJ) by providing input equaliza-
tion. This device features channel-independent digital
preemphasis 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 OOB signal detection on the inputs and squelch
on the corresponding outputs. Inputs and outputs are all
internally 50I terminated and must be AC-coupled to the
SATA controller IC and SATA device.
The MAX4951BE 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 0NC to +70NC operating
temperature range.
Applications
Laptop Computers
Servers
Desktop Computers
Docking Stations
Data Storage/Workstations
FeaturesSingle +3.3V Supply OperationLow-Power, 500µA (typ) eSATA Cable DetectDrive DetectionDynamic Power ReductionReduced Power Consumption in Active ModeFixed Input EqualizationPermits Longer Traces Leading to the DeviceSelectable Output PreemphasisImproved Output EyeSATA I (1.5Gbps) and SATA II (3.0Gbps)
CompliantSATA III (6.0Gbps) CompliantSupports eSATA Output LevelsSupports SATA OOB SignalingOOB Detection: 8ns (max)Internal Input/Output 50I Termination ResistorsInline Signal Traces for Flow-Through LayoutSpace-Saving, 4mm x 4mm TQFN Package with
Exposed PadHigh ESD Protection on All Pins: ±8kV (HBM)
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-PACKAGE
MAX4951BECTP+0NC to +70NC20 TQFN-EP*
SATA I/II/III Bidirectional Redriver
with Input Equalization and Preemphasis
MAX4951BE
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.
(All voltages referenced to GND unless otherwise noted.)
VCC .......................................................................-0.3V to +4.0V
AINP, AINM, BINP, BINM, EN, CAD,
PA, PB (Note 1) .......................................-0.3V to (VCC +0.4V)
Short-Circuit Output Current
(BOUTP, BOUTM, AOUTP, AOUTM) ...........................Q30mA
Continuous Current at Inputs
(AINP, AINM, BINP, BINM) ............................................Q5mA
Continuous Power Dissipation (TA = +70NC)
TQFN (derate 25.6mW/NC above +70NC) ..................2051mW
ESD Protection on All Pins (HBM) .......................................Q8kV
Operating Temperature Range .............................0NC to +70NC
Storage Temperature Range ............................-55NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, CL = 12nF, RL = 50I, TA = 0NC to +70NC, unless otherwise noted. Typical values are at VCC = +3.3V, TA =
+25NC.) (Note 3)
ABSOLUTE MAXIMUM RATINGS
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 /thermal-tutorial.
PACKAGE THERMAL CHARACTERISTICS (Note 2)
TQFN
Junction-to-Ambient Thermal Resistance (qJA) ...........39°C/W
Junction-to-Case Thermal Resistance (qJC) ..................6°C/W
Note 1: All I/O pins are clamped by internal diodes.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Operating Power-Supply RangeVCC3.03.6V
Operating Supply CurrentICC
PA = PB = VCC;
D10.2 pattern, f = 1.5Gbps 7792PA = PB = GND;
D10.2 pattern, f = 1.5Gbps6276
Average Supply Current in
Normal Operation
Duty cycle is 25%
active, 75% idle;
D10.2 pattern
Preemphasis on30
Preemphasis off26
Standby Supply CurrentISTBYEN = GND or CAD = VCC500750FA
Dynamic Power-Down CurrentIDYNPD1420mA
Single-Ended Input ResistanceZRX-SE-DCSingle-ended to VCC (Note 4)4050I
Differential Input ResistanceZRX-DIFF-(Note 4)85100115I
Single-Ended Output ResistanceZTX-SE-DCSingle-ended to VCC (Note 4)4050I
Differential Output ResistanceZTX-DIFF-DC(Note 4)85100115I
AC PERFORMANCE
Differential Input Return Loss
(Notes 4, 5)RLRX-DIFF
f = 150MHz to 300MHz18
f = 300MHz to 600MHz14
f = 600MHz to 1200MHz10
f = 1.2GHz to 2.4GHz8
f = 2.4GHz to 3.0GHz3
SATA I/II/III Bidirectional Redriver
with Input Equalization and Preemphasis
MAX4951BE
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.0V to +3.6V, CL = 12nF, RL = 50I, TA = 0NC to +70NC, unless otherwise noted. Typical values are at VCC = +3.3V, TA =
+25NC.) (Note 3)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Common-Mode Input Return
Loss (Notes 4, 5)RLRX-CM
f = 150MHz to 300MHz5
f = 300MHz to 600MHz5
f = 600MHz to 1200MHz2
f = 1.2GHz to 2.4GHz1
f = 2.4GHz to 3.0GHz1
f = 3.0GHz to 5.0GHz1
Differential Output Return Loss
(Notes 4, 5)RLTX-DIFF
f = 150MHz to 300MHz14
f = 300MHz to 600MHz8
f = 600MHz to 1200MHz6
f = 1.2GHz to 2.4GHz6
f = 2.4GHz to 3.0GHz3
f = 3.0GHz to 5.0GHz1
Common-Mode Output Return
Loss (Notes 4, 5)RLTX-CM
f = 150MHz to 300MHz8
f = 300MHz to 600MHz5
f = 600MHz to 1200MHz2
f = 1.2GHz to 2.4GHz1
f = 2.4GHz to 3.0GHz1
f = 3.0GHz to 5.0GHz1
Common-Mode to Differential
Input Return Loss (Notes 4, 5)
RLRX-CM-
f = 150MHz to 300MHz30
f = 300MHz to 600MHz20
f = 600MHz to 1200MHz10
f = 1.2GHz to 2.4GHz10
f = 2.4GHz to 3.0GHz4
f = 3.0GHz to 5.0GHz4
Common-Mode to Differential
Output Return Loss (Notes 4, 5)
RLTX-CM-
f = 150MHz to 300MHz30
f = 300MHz to 600MHz30
f = 600MHz to 1200MHz20
f = 1.2GHz to 2.4GHz10
f = 2.4GHz to 3.0GHz4
f = 3.0GHz to 5.0GHz4
Differential Input Signal RangeVRX-DFF-PPSATA I, SATA II (Note 4)2251600mVP-P
Differential Output SwingVTX-DFF-PPf = 750MHz (Note 4)PA = PB = GND425525625mVP-P
Output PreemphasisTX-DFF-PP-
PEDBf = 750MHzPA = PB = VCC2.8dB
Input EqualizationVRX-DFF-PP = 300mVP-P,
tIN,RISE/FALL = 20ps2.7dB
Preemphasis Time PeriodtPEf = 750MHz PA = PB = VCC150ps
Propagation DelaytPD150ps
SATA I/II/III Bidirectional Redriver
with Input Equalization and Preemphasis
MAX4951BE
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.0V to +3.6V, CL = 12nF, RL = 50I, TA = 0NC to +70NC, unless otherwise noted. Typical values are at VCC = +3.3V, TA =
+25NC.) (Note 3)
Note 3: All devices are 100% production tested at TA = +70°C. All temperature limits are guaranteed by design.
Note 4: This specification meets SATA v.2.6, gold standard.
Note 5: Guaranteed by design.
Note 6: Rise and fall times are measured using 20% and 80% levels.
Note 7: For SATA 2.0, refer to SATA 2.6-Gold Specification, page 111, Figure 191.
Note 8: For SATA 3.0, refer to SATA Revision 3.0 Release Candidate, page 222, Figure 124.
Note 9: DJ measured using a K28.5 pattern; RJ measured using a D10.2 pattern.
Note 10: Total time for OOB detection circuit to enable/squelch the output.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Output Rise/Fall Time
(Notes 5, 6)tR, tF
PA = PB = GND
SATA I/II (Note 7)67130PA = PB = GND
SATA III (Note 8)4068
Deterministic Jitter (Notes 5, 9)tTX-DJ-DDPA = PB = GND20psP-P
Random Jitter (Notes 5, 9)tTX-RJ-DDPA = PB = GND1.5psRMS
OOB Detector ThresholdSATA OOB pattern, f = 750MHz50150mVP-P
OOB Output Startup/Shutdown
Time(Note 10)48ns
OOB Differential-Offset DeltarVOOB,DFFDifference between OOB and active-mode
output offset-120120mV
OOB Common-Mode DeltarVOOB,CMDifference between OOB and active com-
mon-mode voltage -15+15mV
OOB Output DisableVOOB,OUTVIN < 50mVP-P, output voltage in squelch30mVP-P
LOGIC INPUT
Input Logic-HighVIH1.4V
Input Logic-LowVIL0.6V
Input Logic HysteresisVHYST0.1V
Input Pullup ResistanceRPUPin: CAD 200330kI
Input Pulldown ResistanceRPDPins: EN, PA, PB200330kI
ESD PROTECTION
All PinsHBMQ8kV
SATA I/II/III Bidirectional Redriver
with Input Equalization and Preemphasis
MAX4951BE
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
VIN = 220mVP-P, 6.0Gbps, PA = 1, PB = 1
EYE DIAGRAM VOLTAGE (200mV/div)
MAX4951BE toc09VIN = 220mVP-P, 3.0Gbps, PA = 1, PB = 1
EYE DIAGRAM VOLTAGE (200mV/div)
MAX4951BE toc08VIN = 220mVP-P, 1.5Gbps, PA = 1, PB = 1
EYE DIAGRAM VOLTAGE (200mV/div)
MAX4951BE toc07
VIN = 1600mVP-P, 6.0Gbps, PA = 0, PB = 0
50ps/div
EYE DIAGRAM VOLTAGE (200mV/div)
MAX4951BE toc06VIN = 1600mVP-P, 3.0Gbps, PA = 0, PB = 0
100ps/div
EYE DIAGRAM VOLTAGE (200mV/div)
MAX4951BE toc05VIN = 1600mVP-P, 1.5Gbps, PA = 0, PB = 0
200ps/div
EYE DIAGRAM VOLTAGE (200mV/div)
MAX4951BE toc04
VIN = 220mVP-P, 6.0Gbps, PA = 0, PB = 0
50ps/div
EYE DIAGRAM VOLTAGE (200mV/div)
MAX4951BE toc03VIN = 220mVP-P, 3.0Gbps, PA = 0, PB = 0
100ps/div
EYE DIAGRAM VOLTAGE (200mV/div)
MAX4951BE toc02VIN = 220mVP-P, 1.5Gbps, PA = 0, PB = 0
200ps/div
EYE DIAGRAM VOLTAGE (200mV/div)
MAX4951BE toc01
SATA I/II/III Bidirectional Redriver
with Input Equalization and Preemphasis
MAX4951BE
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
COMMON-MODE TO DIFFERENTIAL OUTPUT
RETURN LOSS vs. FREQUENCY
MAX4951BE toc18
MAGNITUDE (dB)312
MASK
COMMON-MODE TO DIFFERENTIAL INPUT
RETURN LOSS vs. FREQUENCY
MAX4951BE toc17
MAGNITUDE (dB)312
MASK
COMMON-MODE OUTPUT RETURN LOSS
vs. FREQUENCY
MAX4951BE toc16
MAGNITUDE (dB)312
MASK
COMMON-MODE INPUT RETURN LOSS
vs. FREQUENCY
MAX4951BE toc15
FREQUENCY (GHz)
MAGNITUDE (dB)312
MASK
DIFFERENTIAL OUTPUT RETURN LOSS
vs. FREQUENCY
MAX4951BE toc14
FREQUENCY (GHz)
MAGNITUDE (dB)312
MASK
DIFFERENTIAL INPUT RETURN LOSS
vs. FREQUENCY
MAX4951BE toc13
FREQUENCY (GHz)
MAGNITUDE (dB)312
MASK
VIN = 1600mVP-P, 6.0Gbps, PA = 1, PB = 1
50ps/div
EYE DIAGRAM VOLTAGE (200mV/div)
MAX4951BE toc12VIN = 1600mVP-P, 3.0Gbps, PA = 1, PB = 1
100ps/div
EYE DIAGRAM VOLTAGE (200mV/div)
MAX4951BE toc11VIN = 1600mVP-P, 1.5Gbps, PA = 1, PB = 1
200ps/div
EYE DIAGRAM VOLTAGE (200mV/div)
MAX4951BE toc10
SATA I/II/III Bidirectional Redriver
with Input Equalization and Preemphasis
MAX4951BE
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
EYE HEIGHT vs. OUTPUT LENGTH,
PA = 1, PB = 1 (7.5in OF INPUT TRACE)
MAX4951BE toc24
LENGTH (in)
EYE HEIGHT (mV)2015105
VIN = 1VP-P
6Gbps,
NONTRANSITION BITS
3Gbps,
NONTRANSITION BITS
6Gbps,
TRANSITION BITS
3Gbps,
TRANSITION BITS
DETERMINISTIC JITTER vs. OUTPUT LENGTH,
PA = 1, PB = 1
MAX4951BE toc23
LENGTH (in)
DETERMINISTIC JITTER (ps
P-P201510530
VIN = 1VP-P, 7.5in OF INPUT TRACE
3Gbps
6Gbps
EYE HEIGHT vs. OUTPUT LENGTH,
PA = 0, PB = 0 (7.5in OF INPUT TRACE)
MAX4951BE toc22
LENGTH (in)
EYE HEIGHT (mV)2015105
VIN = 1VP-P
6Gbps, TRANSITION BITS
6Gbps,
NONTRANSITION BITS
3Gbps,
NONTRANSITION BITS3Gbps,
TRANSITION BITS
DETERMINISTIC JITTER vs. OUTPUT LENGTH,
PA = 0, PB = 0
MAX4951BE toc21
LENGTH (in)
DETERMINISTIC JITTER (ps
P-P2015105
3Gbps
6Gbps
VIN = 1VP-P, 7.5in OF INPUT TRACE
EYE HEIGHT vs. INPUT LENGTH,
PA = 0, PB = 0
MAX4951BE toc20
LENGTH (in)
EYE HEIGHT (mV)40302010
VIN = 1VP-P3Gbps, NONTRANSITION BITS
6Gbps,
NONTRANSITION BITS
6Gbps,
TRANSITION BITS3Gbps,
TRANSITION BITS
DETERMINISTIC JITTER vs. INPUT LENGTH,
PA = 0, PB = 0
MAX4951BE toc19
LENGTH (in)
DETERMINISTIC JITTER (ps
P-P40302010
VIN = 1VP-P
3Gbps
6Gbps
