Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - buffer amplifiers, repeaters eSATA 6 GBit/s TQFN 20

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-compati-

ble signal level.

The MAX4951 preserves signal integrity at the receiver by

reestablishing full output levels, and can reduce the total

system jitter (T

) 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 50Ω terminated and must be

AC-coupled to the SATA controller IC and SATA device.

The MAX4951 operates from a single +3.3V (typ) sup-

ply 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 0°C to +70°C operat-

ing temperature range.

Applications

Servers

Desktop Computers

Notebook Computers

Docking Stations

Data Storage/Workstations

Features

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

Ω

Termination Resistors

o Inline Signal Traces for Flow-Through Layout

o ESD Protection on All Pins: ±5.5kV

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

MAX4951

SATA I/SATA II Bidirectional Re-Driver

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4178; Rev 1; 5/09

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.

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX4951CTP+ 0°C to +70°C 20 TQFN-EP*

Pin Configuration

HAM

HBP

HAP

DAM

DBM

DBP

DAP

1 2

GND

15 14 12 11

GND

MAX4951

GND

TQFN

4mm x 4mm

TOP VIEW

HBM

*EP

*CONNECT EXPOSED PAD (EP) TO GND.

Summary of content (9 pages)

PAGE 1
9-4178; Rev 1; 5/09 SATA I/SATA II Bidirectional Re-Driver 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.
PAGE 2
MAX4951 SATA I/SATA II Bidirectional Re-Driver 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) ...............................................
PAGE 3
SATA I/SATA II Bidirectional Re-Driver (VCC = +3.0V to +3.6V, CL = 10nF, RL = 50Ω, TA = 0°C to +70°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C.) (Note 3) PARAMETER Differential Output Return Loss (Note 4) Common-Mode Output Return Loss (Note 4) SYMBOL RLTX-DIFF RLTX-CM TYP MAX f = 150MHz to 300MHz CONDITIONS MIN -32 -14 f = 300MHz to 600MHz -26 -8 f = 600MHz to 1200MHz -21 -6 f = 1.2GHz to 2.4GHz -16 -6 f = 2.4GHz to 3.0GHz -15 -3 f = 3.0GHz to 5.
PAGE 4
Typical Operating Characteristics (VCC = 3.3V, TA = +25°C, all eye diagrams measured using K28.5 pattern.) BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 220mVP-P, 3.0Gbps) -100 -200 100 0 -100 -600 -400 -200 0 200 400 -200 200 100 0 -100 -200 -300 -300 600 MAX4951 toc03 MAX4951 toc02 200 -300 -300 -200 -100 0 100 200 300 -150 -100 -50 0 50 100 150 BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 1.5Gbps) BA = BB = GND EYE DIAGRAM (VRX-DFF-PP = 1600mVP-P, 3.
PAGE 5
SATA I/SATA II Bidirectional Re-Driver -200 -400 400 200 0 -200 -400 -600 0 200 400 600 200 0 -200 -600 -300 -200 -100 200ps/div 0 100 200 -150 300 -100 -50 0 100ps/div SATA MASK -5 -10 -15 MAX4951 -25 -30 -35 -40 5 DIFFERENTIAL OUTPUT RETURN LOSS (dB) 5 -20 100 150 DIFFERENTIAL OUTPUT RETURN LOSS vs. FREQUENCY DIFFERENTIAL INPUT RETURN LOSS vs.
PAGE 6
SATA I/SATA II Bidirectional Re-Driver MAX4951 Pin Description PIN NAME FUNCTION 1 HAP Noninverting Input from Host Channel A 2 HAM Inverting Input from Host Channel A 3, 13, 17, 18, 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 0.1µF and 0.001µF capacitors in parallel and as close to the device as possible. 7 EN Active-High Enable Input.
PAGE 7
SATA I/SATA II Bidirectional Re-Driver VCC VCC 50Ω MAX4951 50Ω VCC 50Ω 50Ω HAP DAP HAM DAM VCC 50Ω VCC 50Ω 50Ω 50Ω HBM DBM HBP DBP CONTROL LOGIC GND BA BB EN MAX4951 EN BA BB CHANNEL A CHANNEL B 0 X X Standby Standby 1 0 0 Standard SATA Standard SATA 1 1 0 Boost Standard SATA 1 0 1 Standard SATA Boost 1 1 1 Boost Boost X = Don’t Care Exposed-Pad Package The exposed-pad, 20-pin, TQFN package incorporates features that provide a very low thermal-resistanc
PAGE 8
MAX4951 SATA I/SATA II Bidirectional Re-Driver Human Body Model Power-Supply Sequencing The MAX4951 is characterized for ±5.5kV ESD protection using the Human Body Model (MIL-STD-883, Method 3015). Figure 1 shows the Human Body Model and Figure 2 shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest that is then discharged into the device through a 1.5kΩ resistor.
PAGE 9
SATA I/SATA II Bidirectional Re-Driver MAX4951 +3.3V 0.1µF 0.001µF Tx SATA HOST CONTROLLER 10nF (X7R) HAP DAP HAM DAM 10nF (X7R) 10nF (X7R) 10nF (X7R) Rx 10nF (X7R) MAX4951 HBM DBM HBP DBP 10nF (X7R) 10nF (X7R) EN BA GPIO +3.3V Rx BB Tx eSATA DEVICE CONNECTOR 10nF (X7R) GND Figure 3. Typical Application Circuit Package Information Chip Information For the latest package outline information, go to www.maxim-ic.com/packages.