Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - buffer amplifiers, repeaters eSATA 3 GBit/s TQFN 20

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SATA I/II Bidirectional Redriver

with High ESD and Cable Detect

MAX4951AE

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 (T

) 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

Features

S Single +3.3V (typ) Supply Operation

S Low-Power, 350µA (typ) eSATA Cable Detect

S Supports SATA 1.5Gbps and 3.0Gbps Data Rates

S Meets SATA I, SATA II Input/Output-Return Loss

Mask

S Exceeds eSATA Standard Compliant Eye Mask for

Jitter

S Meets or Exceeds eSATA Standard Compliant Eye

Mask for Output Levels

S Supports SATA OOB Signaling

S Internal Input/Output 50I Termination Resistors

S Inline Signal Traces for Flow-Through Layout

S Pin Compatible with MAX4951

S Space-Saving, 4mm x 4mm, TQFN Package

S ESD 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

DAM

DBM

DBP

DAP

1 2

CAD

4 5

15 14 12 11

GND

TQFN

(4mm × 4mm)

TOP VIEW

HBM

*EP

*CONNECT EXPOSED PAD (EP) TO GND.

MAX4951AE

PART TEMP RANGE PIN-PACKAGE

MAX4951AECTP+

0NC to +70NC

20 TQFN-EP*

Summary of content (10 pages)

PAGE 1
9-4812; Rev 0; 7/09 SATA I/II Bidirectional Redriver with High ESD and Cable Detect Features 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 overcoming losses in the PCB and eSATA connector. S Single +3.
PAGE 2
MAX4951AE SATA I/II Bidirectional Redriver with High ESD and Cable Detect ABSOLUTE MAXIMUM RATINGS (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)................................................
PAGE 3
SATA I/II Bidirectional Redriver with High ESD and Cable Detect (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) PARAMETER Common-Mode Return Loss (Note 4) SYMBOL RLTX-CM CONDITIONS MIN TYP 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 Differential Input Signal Range VRX-DFF-PP SATA 1.5Gbps/3.
PAGE 4
Typical Operating Characteristics (VCC = +3.3V, TA = +25NC, all eye diagrams measured using K28.5 pattern.) VIN = 220mVP-P, 1.5Gbps, B_ = 0 VIN = 220mVP-P, 1.5Gbps, B_ = 1 MAX4951AE toc01 VIN = 1600mVP-P, 1.
PAGE 5
SATA I/II Bidirectional Redriver with High ESD and Cable Detect DIFFERENTIAL INPUT RETURN LOSS vs. FREQUENCY -10 -15 MAX4951AE -20 -25 -30 -35 -40 MAX4951AE toc10 SATA MASK DIFFERENTIAL OUTPUT RETURN LOSS (dB) -5 0 MAX4951AE toc09 DIFFERENTIAL INPUT RETURN LOSS (dB) 0 DIFFERENTIAL OUTPUT RETURN LOSS vs.
PAGE 6
MAX4951AE SATA I/II Bidirectional Redriver with High ESD and Cable Detect Pin Description PIN NAME FUNCTION 1 HAP Noninverting Input from Host Channel A 2 HAM Inverting Input from Host Channel A 3, 13, 17, 19 GND Ground 4 HBM Inverting Output to Host Channel B 5 HBP Noninverting Output to Host Channel B 6, 10, 16, 20 VCC Positive Supply Voltage Input. Bypass VCC to GND with 0.1FF and 0.001FF capacitors in parallel and as close as possible to the device. 7 EN Active-High Enable Input.
PAGE 7
SATA I/II Bidirectional Redriver with High ESD and Cable Detect VCC MAX4951AE VCC 50Ω 50Ω VCC 50Ω 50Ω HAP DAP HAM DAM VCC 50Ω VCC 50Ω 50Ω 50Ω HBM DBM HBP DBP CONTROL LOGIC GND BA EN BB EN CAD STATUS 0 CAD 0 Low-Power Standby 0 1 Low-Power Standby 1 0 Active 1 1 Low-Power Standby BB BA OUTPUT LEVELS 0 0 A and B are Standard Levels 0 1 A is Boosted and B is Standard 1 0 A is Standard and B is Boosted 1 1 A and B are Boosted Note: BA, BB, and EN are internally
PAGE 8
MAX4951AE SATA I/II Bidirectional Redriver with High ESD and Cable Detect Detailed Description The MAX4951AE consists of two identical buffers that take SATA input signals and return them to full output levels while withstanding ESD events up to Q8kV (HBM).
PAGE 9
SATA I/II Bidirectional Redriver with High ESD and Cable Detect mal and electrical 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. Figure 4 shows a typical application circuit with the MAX4951AE used to drive an eSATA output. The diagram assumes that the MAX4951AE is close to the SATA host controller.
PAGE 10
MAX4951AE SATA I/II Bidirectional Redriver with High ESD and Cable Detect +3.3V 0.1µF 0.001µF VCC 1 10nF (X7R) Tx SATA HOST CONTROLLER 10nF (X7R) HAP DAP HAM DAM 10nF (X7R) Rx 10nF (X7R) MAX4951AE 3 4 10nF (X7R) 10nF (X7R) HBM Rx 2 5 DBM 10nF (X7R) Tx 10nF (X7R) HBP eSATA DEVICE CONNECTOR DBP 6 7 EN BA GPIO +3.3V BB GND CAD Figure 5.