MAX4951 DS - Mouser Electronics

19-4178; 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. 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) 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 0°C to +70°C operating temperature range.
Applications
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
Ω Termination Resistors
o Internal Input/Output 50Ω
o Inline Signal Traces for Flow-Through Layout
o ESD Protection on All Pins: ±5.5kV
o Space-Saving, 4mm x 4mm, TQFN Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX4951CTP+
0°C to +70°C
20 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Servers
Pin Configuration
Desktop Computers
GND
DBM
DBP
Data Storage/Workstations
DAM
TOP VIEW
Docking Stations
DAP
Notebook Computers
15
14
13
12
11
VCC 16
10
VCC
GND 17
9
BA
8
BB
7
EN
6
VCC
GND 18
MAX4951
GND 19
*EP
2
3
4
5
GND
HBM
HBP
HAP
1
HAM
VCC 20
TQFN
4mm x 4mm
*CONNECT EXPOSED PAD (EP) TO GND.
________________________________________________________________ Maxim Integrated Products
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.
1
MAX4951
General Description
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) ...............................................±30mA
Continuous Current
(EN, BA, BB) ...................................................................±5mA
Continuous Power Dissipation (TA = +70°C)
20-Pin TQFN (derate 25.6mW/°C above +70°C) ..... 2051mW
Junction-to-Case Thermal Resistance (θJC) (Note 2)
20-Pin TQFN...................................................................6°C/W
Junction-to-Ambient Thermal Resistance (θJA) (Note 2)
20-Pin TQFN.................................................................39°C/W
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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 = 50Ω, TA = 0°C to +70°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C.)
(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
SYMBOL
CONDITIONS
TYP
MAX
UNITS
3.6
V
BA = BB = VCC
90
125
BA = BB = GND
70
100
7
10
VCC
ICC
ISTBY
MIN
3.0
EN = GND
ZRX-SE-DC
40
ZRX-DIFF-DC
85
ZTX-SE-DC
40
ZTX-DIFF-DC
85
mA
mA
Ω
100
115
100
115
f = 150MHz to 300MHz
-29
-18
f = 300MHz to 600MHz
-26
-14
f = 600MHz to 1200MHz
-22
-10
f = 1.2GHz to 2.4GHz
-18
-8
f = 2.4GHz to 3.0GHz
-15
-3
f = 3.0GHz to 5.0GHz
-14
-1
Ω
Ω
Ω
AC PERFORMANCE
Differential Input Return Loss
(Note 4)
Common-Mode Input Return Loss
(Note 4)
2
RLRX-DIFF
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
f = 3.0GHz to 5.0GHz
-1
_______________________________________________________________________________________
dB
dB
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 5.0GHz
-13
-1
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
f = 3.0GHz to 5.0GHz
Differential Input Signal Range
VRX-DFF-PP
SATA 1.5Gbps/3.0Gbps
Differential Output Swing
VTX-DFF-PP
f = 750MHz
Propagation Delay
tR
dB
dB
-1
220
1600
BA = BB = GND
450
525
650
BA = BB = VCC
770
930
1144
tPD
Output Rise/Fall Time
UNITS
240
(Notes 4, 5)
mVP-P
mVP-P
ps
60
ps
Deterministic Jitter
TTX-DJ-DFF
Up to 6.0Gbps (Notes 4, 6)
15
psP-P
Random Jitter
TTX-RJ-DFF
Up to 6.0Gbps (Notes 4, 6)
1.8
psRMS
150
mVP-P
5
ns
OOB Detector Threshold
OOB Output Startup/Shutdown Time
Crosstalk
VTH-OOB
tOOB
CTK
SATA OOB
50
(Note 7)
f ≤ 1.5GHz
2
BA = BB = GND
-35
BA = BB = VCC
-30
dB
LOGIC INPUT
Input Logic-High
VIH
Input Logic-Low
1.4
V
VIL
Input Logic Hysteresis
0.6
VHYST
V
0.1
V
±5.5
kV
ESD PROTECTION
All Pins
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Human Body Model
All devices are 100% production tested at TA = +70°C. 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.
_______________________________________________________________________________________
3
MAX4951
ELECTRICAL CHARACTERISTICS (continued)
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, 3.0Gbps)
BA = BB = GND EYE DIAGRAM
(VRX-DFF-PP = 1600mVP-P, 6.0Gbps)
-200
0
-100
-200
-300
-300
-400
-200
0
200
400
0
-100
-200
-300
-300
600
100
-200
-100
0
100
200
300
-150
-100
-50
0
50
100
BA = BB = VCC EYE DIAGRAM
(VRX-DFF-PP = 220mVP-P, 1.5Gbps)
BA = BB = VCC EYE DIAGRAM
(VRX-DFF-PP = 220mVP-P, 3.0Gbps)
BA = BB = VCC EYE DIAGRAM
(VRX-DFF-PP = 220mVP-P, 6.0Gbps)
200mV/div
200
0
-200
-400
500
400
300
200
100
0
-100
-200
-300
-400
-500
500
400
300
200
200mV/div
400
200mV/div
MAX4951 toc07
600
150
MAX4951 toc09
50ps/div
EYE DIAGRAM VOLTAGE (mV)
100ps/div
MAX4951 toc08
200ps/div
EYE DIAGRAM VOLTAGE (mV)
-600
200
100mV/div
-100
100
300
EYE DIAGRAM VOLTAGE (mV)
0
200
100mV/div
100mV/div
100
EYE DIAGRAM VOLTAGE (mV)
200
300
MAX4951 toc06
50ps/div
MAX4951 toc05
100ps/div
MAX4951 toc04
200ps/div
300
EYE DIAGRAM VOLTAGE (mV)
300
100mV/div
0
300
EYE DIAGRAM VOLTAGE (mV)
100
BA = BB = GND EYE DIAGRAM
(VRX-DFF-PP = 220mVP-P, 6.0Gbps)
100mV/div
200
100mV/div
EYE DIAGRAM VOLTAGE (mV)
300
EYE DIAGRAM VOLTAGE (mV)
MAX4951 toc01
BA = BB = GND EYE DIAGRAM
(VRX-DFF-PP = 220mVP-P, 1.5Gbps)
EYE DIAGRAM VOLTAGE (mV)
MAX4951
SATA I/SATA II Bidirectional Re-Driver
100
0
-100
-200
-300
-400
-500
-600
-600
-400
-200
0
200ps/div
4
200
400
600
-300
-200
-100
0
100
200
300
-150
-100
-50
100ps/div
_______________________________________________________________________________________
0
50ps/div
50
100
150
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. FREQUENCY
0
50
50ps/div
MAX4951 toc14
-200
MAX4951 toc13
-400
400
-400
-600
-600
MAX4951 toc12
MAX4951 toc11
600
EYE DIAGRAM VOLTAGE (mV)
0
BA = BB = VCC EYE DIAGRAM
(VRX-DFF-PP = 1600mVP-P, 6.0Gbps)
200mV/div
200mV/div
200
600
EYE DIAGRAM VOLTAGE (mV)
MAX4951 toc10
400
DIFFERENTIAL INPUT RETURN LOSS (dB)
EYE DIAGRAM VOLTAGE (mV)
600
BA = BB = VCC EYE DIAGRAM
(VRX-DFF-PP = 1600mVP-P, 3.0Gbps)
200mV/div
BA = BB = VCC EYE DIAGRAM
(VRX-DFF-PP = 1600mVP-P, 1.5Gbps)
SATA MASK
0
-5
-10
-15
-20
MAX4951
-25
-30
-35
-40
-45
-45
0
1
2
3
FREQUENCY (GHz)
4
5
0
1
2
3
FREQUENCY (GHz)
4
5
_______________________________________________________________________________________
5
MAX4951
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25°C, all eye diagrams measured using K28.5 pattern.)
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. Drive EN low to put device in standby mode. Drive EN high for normal operation.
EN is internally pulled down.
8
BB
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.
9
BA
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.
11
DBP
Noninverting Input from Device Channel B
12
DBM
Inverting Input from Device Channel B
14
DAM
Inverting Output to Device Channel A
15
DAP
—
EP
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.
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.
Input/Output Terminations
Inputs and outputs are internally 50Ω 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.
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.
6
Enable Input
The MAX4951 features an active-high enable input (EN).
EN has an internal pulldown resistor of 70kΩ (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.
Output Boost Selection Inputs
The MAX4951 has two digital control logic inputs, BA
and BB. BA and BB have internal pulldown resistors of
70kΩ (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.
Applications Information
Figure 3 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.
_______________________________________________________________________________________
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-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.
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.
ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electrostatic discharges encountered during handling and
assembly. The MAX4951 is protected against ESD up
to ±5.5kV (Human Body Model) without damage. The
ESD structures withstand ±5.5kV in all states: normal
operation and powered down. After an ESD event, the
MAX4951 continues to function without latchup.
_______________________________________________________________________________________
7
MAX4951
Functional Diagram/Truth Table
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.
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.
RC
1MΩ
CHARGE-CURRENT
LIMIT RESISTOR
RD
1500Ω
IP 100%
90%
DISCHARGE
RESISTANCE
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
AMPS
HIGHVOLTAGE
DC
SOURCE
Cs
100pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
36.8%
10%
0
0
Figure 1. Human Body ESD Test Model
8
tRL
TIME
tDL
CURRENT WAVEFORM
Figure 2. Human Body Current Waveform
_______________________________________________________________________________________
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.
PROCESS: BiCMOS
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
20 TQFN-EP
T2044-2
21-0139
Revision History
REVISION
NUMBER
REVISION
DATE
0
6/08
Initial release
1
5/09
Updated Features, Electrical Characteristics table, Applications Information
section, and added ESD Protection and Human Body Model sections.
DESCRIPTION
PAGES
CHANGED
—
1, 3, 6, 7, 8
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
Mouser Electronics
Authorized Distributor
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