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MAX4951AECTP+
SATA I/II Bidirectional Redriver with High ESD and Cable Detect
SATA I/II Bidirectional Redriver
with High ESD and Cable Detect
General Description
The MAX4951AE dual-channel buffer is designed to
redrive serial-ATA (SATA) I and SATA II signals and
can survive ESD events up to Q8kV Human Body Model
(HBM). The MAX4951AE can be placed near an eSATA
connector to overcome board losses and produce an
eSATA-compliant signal level. This device is Serial ATA
Revision 2.6 (gold standard)-compliant, while overcom-
ing losses in the PCB and eSATA connector.
The MAX4951AE features low standby current for power-
sensitive applications. This device features hardware
SATA-drive cable detection, keeping the power low in
standby mode.
The MAX4951AE preserves signal integrity at the receiv-
er by reestablishing full output levels. It reduces the total
system jitter (TJ) by squaring up the signal and providing
excellent return loss match to the source. This device
features channel-independent digital boost controls
to drive SATA outputs over normal trace lengths and
eSATA connector. 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 50I terminated.
The MAX4951AE 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
Docking Stations
Desktop Computers
Servers
Data Storage/Work Stations
FeaturesSingle +3.3V (typ) Supply OperationLow-Power, 350µA (typ) eSATA Cable DetectSupports SATA 1.5Gbps and 3.0Gbps Data RatesMeets SATA I, SATA II Input/Output-Return Loss
MaskExceeds eSATA Standard Compliant Eye Mask for
JitterMeets or Exceeds eSATA Standard Compliant Eye
Mask for Output LevelsSupports SATA OOB SignalingInternal Input/Output 50I Termination ResistorsInline Signal Traces for Flow-Through LayoutPin Compatible with MAX4951Space-Saving, 4mm x 4mm, TQFN PackageESD Protection on All Pins: ±8kV (HBM)
19-4812; Rev 0; 7/09
Pin Configuration
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
HAM
HBP
HAP
DAMDBMDBPDAP2
CAD5141211
GND
VCC
VCC
GND
GND
GND10VCCVCC
TQFN
(4mm × 4mm)TOP VIEW
HBM
*EP
*CONNECT EXPOSED PAD (EP) TO GND.
MAX4951AE
PARTTEMP RANGEPIN-PACKAGE
MAX4951AECTP+0NC to +70NC20 TQFN-EP*
SATA I/II Bidirectional Redriver
with High ESD and Cable Detect
MAX4951AE
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.
(Voltages Referenced to GND.)
VCC ...................................................................... -0.3V to +4.0V
HAP, HAM, DBP, DBM, EN,
CAD, BA, BB (Note 1) ......................... -0.3V to (VCC + 0.3V)
Short-Circuit Output Current
(HBP, HBM, DAP, DAM) ............................................. Q30mA
Continuous Current at Inputs
(HAP, HAM, DBP, DBM) ............................................... Q5mA
Continuous Current
(EN, CAD, BA, BB) ........................................................ Q5mA
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
Storage Temperature Range ......................... -55NC to +150NC
Lead Temperature (soldering, 10s) ...............................+300NC
ELECTRICAL CHARACTERISTICS
(VCC = +3.0V to +3.6V, CL = 10nF, RL = 50I, TA = 0NC to +70NC, unless otherwise noted. Typical values are at VCC = +3.3V,
TA = +25NC.) (Note 3)
ABSOLUTE MAXIMUM RATINGS
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 /thermal-tutorial.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Operating Power-Supply RangeVCC3.03.6V
Operating Supply CurrentICCBA = BB = VCC75100mABA = BB = GND7090
Power-Down Supply CurrentIPWDNEN = GND or CAD = VCC0.352mA
Differential Input ResistanceZRX-DIFF-DC85100115I
Differential Output ResistanceZTX-DIFF-DC85100115I
AC PERFORMANCE
Differential Input Return Loss
(Note 4)RLRX-DIFF
f = 150MHz to 300MHz-18
f = 300MHz to 600MHz-14
f = 600MHz to 1200MHz-10
f = 1.2GHz to 2.4GHz-8
f = 2.4GHz to 3.0GHz-3
Common-Mode Input Return
Loss (Note 4)RLRX-CM
f = 150MHz to 300MHz-5
f = 300MHz to 600MHz-5
f = 600MHz to 1200MHz-2
f = 1.2GHz to 2.4GHz-2
f = 2.4GHz to 3.0GHz-2
Differential Output Return Loss
(Note 4)RLTX-DIFF
f = 150MHz to 300MHz-14
f = 300MHz to 600MHz-8
f = 600MHz to 1200MHz-6
f = 1.2GHz to 2.4GHz-6
f = 2.4GHz to 3.0GHz-3
SATA I/II Bidirectional Redriver
with High ESD and Cable Detect
MAX4951AE
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.0V to +3.6V, CL = 10nF, 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 = +25NC. All temperature limits are guaranteed by design.
Note 4: Guaranteed by design.
Note 5: Rise and fall times are measured using 20% and 80% levels.
Note 6: DJ measured using K28.5 pattern; RJ measured using D10.2 pattern
Note 7: Total time for OOB detection circuit to enable/squelch the output.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Common-Mode Return Loss
(Note 4)RLTX-CM
f = 150MHz to 300MHz-8
f = 300MHz to 600MHz-5
f = 600MHz to 1200MHz-2
f = 1.2GHz to 2.4GHz-2
f = 2.4GHz to 3.0GHz-2
Differential Input Signal RangeVRX-DFF-PPSATA 1.5Gbps/3.0Gbps2201600mVP-P
Differential Output SwingVTX-DFF-PP
f = 750MHzBA = BB = GND425525625
mVP-PBA = BB = VCC525625725
f = 1.5GHzBA = BB = GND400500600
BA = BB = VCC500600700
Propagation DelaytPD240ps
Output Rise/Fall TimetR/FFigure 1, (Notes 4, 5) 67136ps
Deterministic JitterTTX-DJ-DDUp to 3.0Gbps (Notes 4, 6)15psP-P
Random JitterTTX-RJ-DDUp to 3.0Gbps (Notes 4, 6)1.8psRMS
OOB Detector ThresholdVTH-OOBSATA OOB pattern50200mVP-P
OOB Output Startup/Shutdown
TimetOOB(Note 7)35ns
CONTROL LOGIC (BA, BB, EN, CAD)
Input Logic HighVIH1.4V
Input Logic LowV IL0.6V
Input Logic HysteresisVHYST0.1V
Pullup/Pulldown Input ResistorRUP/DOWN330kI
ESD PROTECTION
All PinsHuman Body ModelQ8kV
SATA I/II Bidirectional Redriver
with High ESD and Cable Detect
MAX4951AE
Typical Operating Characteristics
(VCC = +3.3V, TA = +25NC, all eye diagrams measured using K28.5 pattern.)
VIN = 220mVP-P, 1.5Gbps, B_ = 0
200ps/div
100mV/div
MAX4951AE toc01VIN = 220mVP-P, 1.5Gbps, B_ = 1
200ps/div
100mV/div
MAX4951AE toc02VIN = 1600mVP-P, 1.5Gbps, B_ = 0
200ps/div
100mV/div
MAX4951AE toc03
VIN = 1600mVP-P, 1.5Gbps, B_ = 1
200ps/div
100mV/div
MAX4951AE toc04VIN = 220mVP-P, 3Gbps, B_ = 0
100ps/div
100mV/div
MAX4951AE toc05VIN = 220mVP-P, 3Gbps, B_ = 1
100ps/div
100mV/div
MAX4951AE toc06
VIN = 1600mVP-P, 3Gbps, B_ = 0
100mV/div
MAX4951AE toc07VIN = 1600mVP-P, 3Gbps, B_ = 1
100mV/div
MAX4951AE toc08
SATA I/II Bidirectional Redriver
with High ESD and Cable Detect
MAX4951AE
Typical Operating Characteristics (continued)
(VCC = +3.3V, TA = +25NC, all eye diagrams measured using K28.5 pattern.)
Figure 1. Circuit for Measuring tR/F for MAX4951AE (See SATA Specifications for Compliance Measurement)
DIFFERENTIAL INPUT RETURN LOSS
vs. FREQUENCY
MAX4951AE toc09
FREQUENCY (GHz)
DIFFERENTIAL INPUT RETURN LOSS (dB)1
SATA MASK
MAX4951AE
DIFFERENTIAL OUTPUT RETURN LOSS
vs. FREQUENCY
MAX4951AE toc10
FREQUENCY (GHz)
DIFFERENTIAL OUTPUT RETURN LOSS (dB)1
SATA MASK
MAX4951AE
RISE/FALL-TIME
COMPLIANCE POINT
CONTROLLED
IMPEDANCE
eSATA CONNECTOR
2in (5cm) MINIMUM
MAX4951AE
SATA I/II Bidirectional Redriver
with High ESD and Cable Detect
MAX4951AE
Pin Description
PINNAMEFUNCTIONHAPNoninverting Input from Host Channel AHAMInverting Input from Host Channel A
3, 13, 17, 19GNDGroundHBMInverting Output to Host Channel BHBPNoninverting Output to Host Channel B
6, 10, 16, 20VCCPositive Supply Voltage Input. Bypass VCC to GND with 0.1FF and 0.001FF capacitors in parallel
and as close as possible to the device.ENActive-High Enable Input. Drive EN low to put device in standby mode. Drive EN high for normal
operation. EN is internally pulled down with a 330kI (typ) resistor.BBChannel-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 with a 330kI (typ) resistor.BAChannel-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 with a 330kI (typ) resistor.DBPNoninverting Input from Device Channel BDBMInverting Input from Device Channel BDAMInverting Output to Device Channel ADAPNoninverting Output to Device Channel ACADActive-Low Cable-Detect Input. Drive CAD high to put device in standby mode. Drive CAD low for
normal operation. CAD is internally pulled up with a 330kI (typ) resistor.EPExposed Pad. Internally connected to GND. EP must be electrically connected to a ground plane
for proper thermal and electrical operation.
